[FFmpeg-devel] [FFmpeg-cvslog] libavformat/dvdvideo: add DVD-Video demuxer, powered by libdvdread and libdvdnav

Jean-Baptiste Kempf jb at videolan.org
Sat Mar 2 19:03:36 EET 2024


Hello,

This is missing an "enabled gpl" in the configure.

BR,

On Sat, 2 Mar 2024, at 09:08, Marth64 wrote:
> ffmpeg | branch: master | Marth64 <marth64 at proxyid.net> | Sun Feb 18 
> 22:01:44 2024 -0600| [a1304272c3a0ef7c3d77c702dd466b3f11bf300f] | 
> committer: Anton Khirnov
>
> libavformat/dvdvideo: add DVD-Video demuxer, powered by libdvdread and libdvdnav
>
> Signed-off-by: Marth64 <marth64 at proxyid.net>
> Signed-off-by: Anton Khirnov <anton at khirnov.net>
>
>> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a1304272c3a0ef7c3d77c702dd466b3f11bf300f
> ---
>
>  Changelog                 |    1 +
>  configure                 |    8 +
>  doc/demuxers.texi         |  130 +++++
>  libavformat/Makefile      |    1 +
>  libavformat/allformats.c  |    1 +
>  libavformat/dvdvideodec.c | 1411 +++++++++++++++++++++++++++++++++++++++++++++
>  6 files changed, 1552 insertions(+)
>
> diff --git a/Changelog b/Changelog
> index c65ef492be..fedad5782c 100644
> --- a/Changelog
> +++ b/Changelog
> @@ -29,6 +29,7 @@ version <next>:
>    build environment if it lacks C17 support
>  - Change the default bitrate control method from VBR to CQP for QSV encoders.
>  - removed deprecated ffmpeg CLI options -psnr and -map_channel
> +- DVD-Video demuxer, powered by libdvdnav and libdvdread
> 
>  version 6.1:
>  - libaribcaption decoder
> diff --git a/configure b/configure
> index b5b233e852..db7dc89755 100755
> --- a/configure
> +++ b/configure
> @@ -227,6 +227,8 @@ External library support:
>    --enable-libdavs2        enable AVS2 decoding via libdavs2 [no]
>    --enable-libdc1394       enable IIDC-1394 grabbing using libdc1394
>                             and libraw1394 [no]
> +  --enable-libdvdnav       enable libdvdnav, needed for DVD demuxing 
> [no]
> +  --enable-libdvdread      enable libdvdread, needed for DVD demuxing 
> [no]
>    --enable-libfdk-aac      enable AAC de/encoding via libfdk-aac [no]
>    --enable-libflite        enable flite (voice synthesis) support via 
> libflite [no]
>    --enable-libfontconfig   enable libfontconfig, useful for drawtext 
> filter [no]
> @@ -1806,6 +1808,8 @@ EXTERNAL_LIBRARY_GPL_LIST="
>      frei0r
>      libcdio
>      libdavs2
> +    libdvdnav
> +    libdvdread
>      librubberband
>      libvidstab
>      libx264
> @@ -3526,6 +3530,8 @@ dts_demuxer_select="dca_parser"
>  dtshd_demuxer_select="dca_parser"
>  dv_demuxer_select="dvprofile"
>  dv_muxer_select="dvprofile"
> +dvdvideo_demuxer_select="mpegps_demuxer"
> +dvdvideo_demuxer_deps="libdvdnav libdvdread"
>  dxa_demuxer_select="riffdec"
>  eac3_demuxer_select="ac3_parser"
>  evc_demuxer_select="evc_frame_merge_bsf evc_parser"
> @@ -6775,6 +6781,8 @@ enabled libdav1d          && require_pkg_config 
> libdav1d "dav1d >= 0.5.0" "dav1d
>  enabled libdavs2          && require_pkg_config libdavs2 "davs2 >= 
> 1.6.0" davs2.h davs2_decoder_open
>  enabled libdc1394         && require_pkg_config libdc1394 libdc1394-2 
> dc1394/dc1394.h dc1394_new
>  enabled libdrm            && check_pkg_config libdrm libdrm xf86drm.h 
> drmGetVersion
> +enabled libdvdnav         && require_pkg_config libdvdnav "dvdnav >= 
> 6.1.1" dvdnav/dvdnav.h dvdnav_open2
> +enabled libdvdread        && require_pkg_config libdvdread "dvdread >= 
> 6.1.2" dvdread/dvd_reader.h DVDOpen2 -ldvdread
>  enabled libfdk_aac        && { check_pkg_config libfdk_aac fdk-aac 
> "fdk-aac/aacenc_lib.h" aacEncOpen ||
>                                 { require libfdk_aac 
> fdk-aac/aacenc_lib.h aacEncOpen -lfdk-aac &&
>                                   warn "using libfdk without 
> pkg-config"; } }
> diff --git a/doc/demuxers.texi b/doc/demuxers.texi
> index e4c5b560a6..062ea2ea42 100644
> --- a/doc/demuxers.texi
> +++ b/doc/demuxers.texi
> @@ -285,6 +285,136 @@ This demuxer accepts the following option:
> 
>  @end table
> 
> + at section dvdvideo
> +
> +DVD-Video demuxer, powered by libdvdnav and libdvdread.
> +
> +Can directly ingest DVD titles, specifically sequential PGCs,
> +into a conversion pipeline. Menus and seeking are not supported at 
> this time.
> +
> +Block devices (DVD drives), ISO files, and directory structures are 
> accepted.
> +Activate with @code{-f dvdvideo} in front of one of these inputs.
> +
> +Underlying playback is handled by libdvdnav, and structure parsing by 
> libdvdread.
> +FFmpeg must be built with GPL library support available as well as the
> +configure switches @code{--enable-libdvdnav} and 
> @code{--enable-libdvdread}.
> +
> +You will need to provide either the desired "title number" or exact 
> PGC/PG coordinates.
> +Many open-source DVD players and tools can aid in providing this 
> information.
> +If not specified, the demuxer will default to title 1 which works for 
> many discs.
> +However, due to the flexibility of the format, it is recommended to 
> check manually.
> +There are many discs that are authored strangely or with invalid 
> headers.
> +
> +If the input is a real DVD drive, please note that there are some 
> drives which may
> +silently fail on reading bad sectors from the disc, returning random 
> bits instead
> +which is effectively corrupt data. This is especially prominent on 
> aging or rotting discs.
> +A second pass and integrity checks would be needed to detect the 
> corruption.
> +This is not an FFmpeg issue.
> +
> + at subsection Background
> +
> +DVD-Video is not a directly accessible, linear container format in the
> +traditional sense. Instead, it allows for complex and programmatic 
> playback of
> +carefully muxed MPEG-PS streams that are stored in headerless VOB 
> files.
> +To the end-user, these streams are known simply as "titles", but the 
> actual
> +logical playback sequence is defined by one or more "PGCs", or Program 
> Group Chains,
> +within the title. The PGC is in turn comprised of multiple "PGs", or 
> Programs",
> +which are the actual video segments (and for a typical video feature, 
> sequentially
> +ordered). The PGC structure, along with stream layout and metadata, 
> are stored in
> +IFO files that need to be parsed. PGCs can be thought of as playlists 
> in easier terms.
> +
> +An actual DVD player relies on user GUI interaction via menus and an 
> internal VM
> +to drive the direction of demuxing. Generally, the user would either 
> navigate (via menus)
> +or automatically be redirected to the PGC of their choice. During this 
> process and
> +the subsequent playback, the DVD player's internal VM also maintains a 
> state and
> +executes instructions that can create jumps to different sectors 
> during playback.
> +This is why libdvdnav is involved, as a linear read of the MPEG-PS 
> blobs on the
> +disc (VOBs) is not enough to produce the right sequence in many cases.
> +
> +There are many other DVD structures (a long subject) that will not be 
> discussed here.
> +NAV packets, in particular, are handled by this demuxer to build 
> accurate timing
> +but not emitted as a stream. For a good high-level understanding, 
> refer to:
> + at url{https://code.videolan.org/videolan/libdvdnav/-/blob/master/doc/dvd_structures}
> +
> + at subsection Options
> +
> +This demuxer accepts the following options:
> +
> + at table @option
> +
> + at item title @var{int}
> +The title number to play. Must be set if @option{pgc} and @option{pg} 
> are not set.
> +Default is 0 (auto), which currently only selects the first available 
> title (title 1)
> +and notifies the user about the implications.
> +
> + at item chapter_start @var{int}
> +The chapter, or PTT (part-of-title), number to start at. Default is 1.
> +
> + at item chapter_end @var{int}
> +The chapter, or PTT (part-of-title), number to end at. Default is 0,
> +which is a special value to signal end at the last possible chapter.
> +
> + at item angle @var{int}
> +The video angle number, referring to what is essentially an additional
> +video stream that is composed from alternate frames interleaved in the 
> VOBs.
> +Default is 1.
> +
> + at item region @var{int}
> +The region code to use for playback. Some discs may use this to 
> default playback
> +at a particular angle in different regions. This option will not 
> affect the region code
> +of a real DVD drive, if used as an input. Default is 0, "world".
> +
> + at item pgc @var{int}
> +The entry PGC to start playback, in conjunction with @option{pg}.
> +Alternative to setting @option{title}.
> +Chapter markers are not supported at this time.
> +Default is 0, automatically resolve from value of @option{title}.
> +
> + at item pg @var{int}
> +The entry PG to start playback, in conjunction with @option{pgc}.
> +Alternative to setting @option{title}.
> +Chapter markers are not supported at this time.
> +Default is 0, automatically resolve from value of @option{title}.
> +
> + at item preindex @var{bool}
> +Enable this to have accurate chapter (PTT) markers and duration 
> measurement,
> +which requires a slow second pass read in order to index the chapter 
> marker
> +timestamps from NAV packets. This is non-ideal extra work for real 
> optical drives.
> +It is recommended and faster to use this option with a backup of the 
> DVD structure
> +stored on a hard drive. Not compatible with @option{pgc} and 
> @option{pg}.
> +Default is 0, false.
> +
> + at item trim @var{bool}
> +Skip padding cells (i.e. cells shorter than 1 second) from the 
> beginning.
> +There exist many discs with filler segments at the beginning of the 
> PGC,
> +often with junk data intended for controlling a real DVD player's
> +buffering speed and with no other material data value.
> +Default is 1, true.
> +
> + at end table
> +
> + at subsection Examples
> +
> + at itemize
> + at item
> +Open title 3 from a given DVD structure:
> + at example
> +ffmpeg -f dvdvideo -title 3 -i <path to DVD> ...
> + at end example
> +
> + at item
> +Open chapters 3-6 from title 1 from a given DVD structure:
> + at example
> +ffmpeg -f dvdvideo -chapter_start 3 -chapter_end 6 -title 1 -i <path 
> to DVD> ...
> + at end example
> +
> + at item
> +Open only chapter 5 from title 1 from a given DVD structure:
> + at example
> +ffmpeg -f dvdvideo -chapter_start 5 -chapter_end 5 -title 1 -i <path 
> to DVD> ...
> + at end example
> + at end itemize
> +
>  @section ea
> 
>  Electronic Arts Multimedia format demuxer.
> diff --git a/libavformat/Makefile b/libavformat/Makefile
> index 4a380668bd..8811a0ffc9 100644
> --- a/libavformat/Makefile
> +++ b/libavformat/Makefile
> @@ -194,6 +194,7 @@ OBJS-$(CONFIG_DTS_MUXER)                 += rawenc.o
>  OBJS-$(CONFIG_DV_MUXER)                  += dvenc.o
>  OBJS-$(CONFIG_DVBSUB_DEMUXER)            += dvbsub.o rawdec.o
>  OBJS-$(CONFIG_DVBTXT_DEMUXER)            += dvbtxt.o rawdec.o
> +OBJS-$(CONFIG_DVDVIDEO_DEMUXER)          += dvdvideodec.o
>  OBJS-$(CONFIG_DXA_DEMUXER)               += dxa.o
>  OBJS-$(CONFIG_EA_CDATA_DEMUXER)          += eacdata.o
>  OBJS-$(CONFIG_EA_DEMUXER)                += electronicarts.o
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index b04b43cab3..3e905c23f8 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -150,6 +150,7 @@ extern const AVInputFormat  ff_dv_demuxer;
>  extern const FFOutputFormat ff_dv_muxer;
>  extern const AVInputFormat  ff_dvbsub_demuxer;
>  extern const AVInputFormat  ff_dvbtxt_demuxer;
> +extern const AVInputFormat  ff_dvdvideo_demuxer;
>  extern const AVInputFormat  ff_dxa_demuxer;
>  extern const AVInputFormat  ff_ea_demuxer;
>  extern const AVInputFormat  ff_ea_cdata_demuxer;
> diff --git a/libavformat/dvdvideodec.c b/libavformat/dvdvideodec.c
> new file mode 100644
> index 0000000000..3355010356
> --- /dev/null
> +++ b/libavformat/dvdvideodec.c
> @@ -0,0 +1,1411 @@
> +/*
> + * DVD-Video demuxer, powered by libdvdnav and libdvdread
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 
> 02110-1301 USA
> + */
> +
> +/*
> + * See doc/demuxers.texi for a high-level overview.
> + *
> + * The tactical approach is as follows:
> + * 1) Open the volume with dvdread
> + * 2) Analyze the user-requested title and PGC coordinates in the IFO 
> structures
> + * 3) Request playback at the coordinates and chosen angle with dvdnav
> + * 5) Begin the playback (reading and demuxing) of MPEG-PS blocks
> + * 6) End playback if navigation goes backwards, to a menu, or a 
> different PGC or angle
> + * 7) Close the dvdnav VM, and free dvdread's IFO structures
> + */
> +
> +#include <dvdnav/dvdnav.h>
> +#include <dvdread/dvd_reader.h>
> +#include <dvdread/ifo_read.h>
> +#include <dvdread/ifo_types.h>
> +#include <dvdread/nav_read.h>
> +
> +#include "libavutil/avstring.h"
> +#include "libavutil/avutil.h"
> +#include "libavutil/intreadwrite.h"
> +#include "libavutil/mem.h"
> +#include "libavutil/opt.h"
> +#include "libavutil/samplefmt.h"
> +#include "libavutil/time.h"
> +#include "libavutil/timestamp.h"
> +
> +#include "avformat.h"
> +#include "avio_internal.h"
> +#include "avlanguage.h"
> +#include "demux.h"
> +#include "internal.h"
> +#include "url.h"
> +
> +#define DVDVIDEO_MAX_PS_SEARCH_BLOCKS                   128
> +#define DVDVIDEO_BLOCK_SIZE                             2048
> +#define DVDVIDEO_TIME_BASE_Q                            (AVRational) { 
> 1, 90000 }
> +#define DVDVIDEO_PTS_WRAP_BITS                          64 /* VOBUs 
> use 32 (PES allows 33) */
> +
> +#define DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE                1024
> +
> +enum DVDVideoSubpictureViewport {
> +    DVDVIDEO_SUBP_VIEWPORT_FULLSCREEN,
> +    DVDVIDEO_SUBP_VIEWPORT_WIDESCREEN,
> +    DVDVIDEO_SUBP_VIEWPORT_LETTERBOX,
> +    DVDVIDEO_SUBP_VIEWPORT_PANSCAN
> +};
> +static const char dvdvideo_subp_viewport_labels[4][13] = {
> +    "Fullscreen", "Widescreen", "Letterbox", "Pan and Scan"
> +};
> +
> +typedef struct DVDVideoVTSVideoStreamEntry {
> +    int                                 startcode;
> +    enum AVCodecID                      codec_id;
> +    int                                 width;
> +    int                                 height;
> +    AVRational                          dar;
> +    AVRational                          framerate;
> +    int                                 has_cc;
> +} DVDVideoVTSVideoStreamEntry;
> +
> +typedef struct DVDVideoPGCAudioStreamEntry {
> +    int                                 startcode;
> +    enum AVCodecID                      codec_id;
> +    int                                 sample_fmt;
> +    int                                 sample_rate;
> +    int                                 bit_depth;
> +    int                                 nb_channels;
> +    AVChannelLayout                     ch_layout;
> +    int                                 disposition;
> +    const char                          *lang_iso;
> +} DVDVideoPGCAudioStreamEntry;
> +
> +typedef struct DVDVideoPGCSubtitleStreamEntry {
> +    int                                 startcode;
> +    enum DVDVideoSubpictureViewport     viewport;
> +    int                                 disposition;
> +    const char                          *lang_iso;
> +} DVDVideoPGCSubtitleStreamEntry;
> +
> +typedef struct DVDVideoPlaybackState {
> +    int                         celln;              /* ID of the 
> active cell */
> +    int                         entry_pgn;          /* ID of the PG we 
> are starting in */
> +    int                         in_pgc;             /* if our 
> navigator is in the PGC */
> +    int                         in_ps;              /* if our 
> navigator is in the program stream */
> +    int                         in_vts;             /* if our 
> navigator is in the VTS */
> +    int64_t                     nav_pts;            /* PTS according 
> to IFO, not frame-accurate */
> +    int                         nb_cells_played;    /* number of cells 
> played back so far */
> +    uint64_t                    pgc_duration_est;   /* estimated 
> duration as reported by IFO */
> +    uint64_t                    pgc_elapsed;        /* the elapsed 
> time of the PGC, cell-relative */
> +    int                         pgc_nb_pg_est;      /* number of PGs 
> as reported by IFOs */
> +    int                         pgcn;               /* ID of the PGC 
> we are playing */
> +    int                         pgn;                /* ID of the PG we 
> are in now */
> +    int                         ptt;                /* ID of the 
> chapter we are in now */
> +    int64_t                     ts_offset;          /* PTS 
> discontinuity offset (ex. VOB change) */
> +    uint32_t                    vobu_duration;      /* duration of the 
> current VOBU */
> +    uint32_t                    vobu_e_ptm;         /* end PTM of the 
> current VOBU */
> +    int                         vtsn;               /* ID of the 
> active VTS (video title set) */
> +    uint64_t                    *pgc_pg_times_est;  /* PG start times 
> as reported by IFO */
> +    pgc_t                       *pgc;               /* handle to the 
> active PGC */
> +    dvdnav_t                    *dvdnav;            /* handle to the 
> dvdnav VM */
> +} DVDVideoPlaybackState;
> +
> +typedef struct DVDVideoDemuxContext {
> +    const AVClass               *class;
> +
> +    /* options */
> +    int                         opt_angle;          /* the 
> user-provided angle number (1-indexed) */
> +    int                         opt_chapter_end;    /* the 
> user-provided exit PTT (0 for last) */
> +    int                         opt_chapter_start;  /* the 
> user-provided entry PTT (1-indexed) */
> +    int                         opt_pg;             /* the 
> user-provided PG number (1-indexed) */
> +    int                         opt_pgc;            /* the 
> user-provided PGC number (1-indexed) */
> +    int                         opt_preindex;       /* pre-indexing 
> mode (2-pass read) */
> +    int                         opt_region;         /* the 
> user-provided region digit */
> +    int                         opt_title;          /* the 
> user-provided title number (1-indexed) */
> +    int                         opt_trim;           /* trim padding 
> cells at beginning */
> +
> +    /* subdemux */
> +    const AVInputFormat         *mpeg_fmt;          /* inner MPEG-PS 
> (VOB) demuxer */
> +    AVFormatContext             *mpeg_ctx;          /* context for 
> inner demuxer */
> +    uint8_t                     *mpeg_buf;          /* buffer for 
> inner demuxer */
> +    FFIOContext                 mpeg_pb;            /* buffer context 
> for inner demuxer */
> +
> +    /* volume */
> +    dvd_reader_t                *dvdread;           /* handle to 
> libdvdread */
> +    ifo_handle_t                *vmg_ifo;           /* handle to the 
> VMG (VIDEO_TS.IFO) */
> +    ifo_handle_t                *vts_ifo;           /* handle to the 
> active VTS (VTS_nn_n.IFO) */
> +
> +    /* playback control */
> +    int64_t                     first_pts;          /* the PTS of the 
> first video keyframe */
> +    int                         play_end;           /* signal EOF to 
> the parent demuxer */
> +    DVDVideoPlaybackState       play_state;         /* the active 
> playback state */
> +    int                         play_started;       /* signal that 
> playback has started */
> +    int                         segment_started;    /* signal that 
> subdemuxer is on a segment */
> +} DVDVideoDemuxContext;
> +
> +static void dvdvideo_libdvdread_log(void *opaque, dvd_logger_level_t 
> level,
> +                                    const char *msg, va_list msg_va)
> +{
> +    AVFormatContext *s = opaque;
> +    char msg_buf[DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE];
> +    int lavu_level = AV_LOG_DEBUG;
> +
> +    vsnprintf(msg_buf, sizeof(msg_buf), msg, msg_va);
> +
> +    if (level == DVD_LOGGER_LEVEL_ERROR)
> +        lavu_level = AV_LOG_ERROR;
> +    else if (level == DVD_LOGGER_LEVEL_WARN)
> +        lavu_level = AV_LOG_WARNING;
> +
> +    av_log(s, lavu_level, "libdvdread: %s\n", msg_buf);
> +}
> +
> +static void dvdvideo_libdvdnav_log(void *opaque, dvdnav_logger_level_t 
> level,
> +                                   const char *msg, va_list msg_va)
> +{
> +    AVFormatContext *s = opaque;
> +    char msg_buf[DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE];
> +    int lavu_level = AV_LOG_DEBUG;
> +
> +    vsnprintf(msg_buf, sizeof(msg_buf), msg, msg_va);
> +
> +    if (level == DVDNAV_LOGGER_LEVEL_ERROR)
> +        lavu_level = AV_LOG_ERROR;
> +    /* some discs have invalid language codes set for menus, which 
> throws noisy warnings */
> +    else if (level == DVDNAV_LOGGER_LEVEL_WARN && !av_strstart(msg, 
> "Language", NULL))
> +        lavu_level = AV_LOG_WARNING;
> +
> +    av_log(s, lavu_level, "libdvdnav: %s\n", msg_buf);
> +}
> +
> +static void dvdvideo_ifo_close(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    if (c->vts_ifo)
> +        ifoClose(c->vts_ifo);
> +
> +    if (c->vmg_ifo)
> +        ifoClose(c->vmg_ifo);
> +
> +    if (c->dvdread)
> +        DVDClose(c->dvdread);
> +}
> +
> +static int dvdvideo_ifo_open(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    dvd_logger_cb dvdread_log_cb;
> +    title_info_t title_info;
> +
> +    dvdread_log_cb = (dvd_logger_cb) { .pf_log = 
> dvdvideo_libdvdread_log };
> +    c->dvdread = DVDOpen2(s, &dvdread_log_cb, s->url);
> +
> +    if (!c->dvdread) {
> +        av_log(s, AV_LOG_ERROR, "Unable to open the DVD-Video 
> structure\n");
> +
> +        return AVERROR_EXTERNAL;
> +    }
> +
> +    if (!(c->vmg_ifo = ifoOpen(c->dvdread, 0))) {
> +        av_log(s, AV_LOG_ERROR, "Unable to open the VMG 
> (VIDEO_TS.IFO)\n");
> +
> +        return AVERROR_EXTERNAL;
> +    }
> +
> +    if (c->opt_title > c->vmg_ifo->tt_srpt->nr_of_srpts) {
> +        av_log(s, AV_LOG_ERROR, "Title %d not found\n", c->opt_title);
> +
> +        return AVERROR_STREAM_NOT_FOUND;
> +    }
> +
> +    title_info = c->vmg_ifo->tt_srpt->title[c->opt_title - 1];
> +    if (c->opt_angle > title_info.nr_of_angles) {
> +        av_log(s, AV_LOG_ERROR, "Angle %d not found\n", c->opt_angle);
> +
> +        return AVERROR_STREAM_NOT_FOUND;
> +    }
> +
> +    if (title_info.nr_of_ptts < 1) {
> +        av_log(s, AV_LOG_ERROR, "Title %d has invalid headers (no PTTs 
> found)\n", c->opt_title);
> +
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    if (c->opt_chapter_start > title_info.nr_of_ptts ||
> +       (c->opt_chapter_end > 0 && c->opt_chapter_end > 
> title_info.nr_of_ptts)) {
> +        av_log(s, AV_LOG_ERROR, "Chapter (PTT) range [%d, %d] is 
> invalid\n",
> +                                c->opt_chapter_start, 
> c->opt_chapter_end);
> +
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    if (!(c->vts_ifo = ifoOpen(c->dvdread, title_info.title_set_nr))) {
> +        av_log(s, AV_LOG_ERROR, "Unable to process IFO structure for 
> VTS %d\n",
> +                                title_info.title_set_nr);
> +
> +        return AVERROR_EXTERNAL;
> +    }
> +
> +    if (title_info.vts_ttn < 1                                      ||
> +        title_info.vts_ttn > 99                                     ||
> +        title_info.vts_ttn > c->vts_ifo->vts_ptt_srpt->nr_of_srpts  ||
> +        c->vts_ifo->vtsi_mat->nr_of_vts_audio_streams > 8           ||
> +        c->vts_ifo->vtsi_mat->nr_of_vts_subp_streams > 32) {
> +
> +        av_log(s, AV_LOG_ERROR, "Title %d has invalid headers in 
> VTS\n", c->opt_title);
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    return 0;
> +}
> +
> +static int dvdvideo_is_cell_promising(AVFormatContext *s, pgc_t *pgc, 
> int celln)
> +{
> +    dvd_time_t cell_duration = pgc->cell_playback[celln - 
> 1].playback_time;
> +
> +    return cell_duration.second >= 1 || cell_duration.minute >= 1 || 
> cell_duration.hour >= 1;
> +}
> +
> +static int dvdvideo_is_pgc_promising(AVFormatContext *s, pgc_t *pgc)
> +{
> +    for (int i = 1; i <= pgc->nr_of_cells; i++)
> +        if (dvdvideo_is_cell_promising(s, pgc, i))
> +            return 1;
> +
> +    return 0;
> +}
> +
> +static void dvdvideo_play_close(AVFormatContext *s, 
> DVDVideoPlaybackState *state)
> +{
> +    if (!state->dvdnav)
> +        return;
> +
> +    /* not allocated by av_malloc() */
> +    if (state->pgc_pg_times_est)
> +        free(state->pgc_pg_times_est);
> +
> +    if (dvdnav_close(state->dvdnav) != DVDNAV_STATUS_OK)
> +        av_log(s, AV_LOG_ERROR, "Unable to close dvdnav successfully, 
> dvdnav error: %s\n",
> +                                dvdnav_err_to_string(state->dvdnav));
> +}
> +
> +static int dvdvideo_play_open(AVFormatContext *s, 
> DVDVideoPlaybackState *state)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    dvdnav_logger_cb dvdnav_log_cb;
> +    dvdnav_status_t dvdnav_open_status;
> +    int32_t disc_region_mask;
> +    int32_t player_region_mask;
> +    int cur_title, cur_pgcn, cur_pgn;
> +    pgc_t *pgc;
> +
> +    dvdnav_log_cb = (dvdnav_logger_cb) { .pf_log = 
> dvdvideo_libdvdnav_log };
> +    dvdnav_open_status = dvdnav_open2(&state->dvdnav, s, 
> &dvdnav_log_cb, s->url);
> +
> +    if (!state->dvdnav                                                 
>          ||
> +        dvdnav_open_status != DVDNAV_STATUS_OK                         
>          ||
> +        dvdnav_set_readahead_flag(state->dvdnav, 0) != 
> DVDNAV_STATUS_OK         ||
> +        dvdnav_set_PGC_positioning_flag(state->dvdnav, 1) != 
> DVDNAV_STATUS_OK   ||
> +        dvdnav_get_region_mask(state->dvdnav, &disc_region_mask) != 
> DVDNAV_STATUS_OK) {
> +
> +        av_log(s, AV_LOG_ERROR, "Unable to open the DVD for 
> playback\n");
> +        goto end_dvdnav_error;
> +    }
> +
> +    player_region_mask = c->opt_region > 0 ? (1 << (c->opt_region - 
> 1)) : disc_region_mask;
> +    if (dvdnav_set_region_mask(state->dvdnav, player_region_mask) != 
> DVDNAV_STATUS_OK) {
> +        av_log(s, AV_LOG_ERROR, "Unable to set the playback region 
> code %d\n", c->opt_region);
> +
> +        goto end_dvdnav_error;
> +    }
> +
> +    if (c->opt_pgc > 0 && c->opt_pg > 0) {
> +        if (dvdnav_program_play(state->dvdnav, c->opt_title, 
> c->opt_pgc, c->opt_pg) != DVDNAV_STATUS_OK) {
> +            av_log(s, AV_LOG_ERROR, "Unable to start playback at title 
> %d, PGC %d, PG %d\n",
> +                                    c->opt_title, c->opt_pgc, 
> c->opt_pg);
> +
> +            goto end_dvdnav_error;
> +        }
> +
> +        state->pgcn = c->opt_pgc;
> +        state->entry_pgn = c->opt_pg;
> +    } else {
> +        if (dvdnav_part_play(state->dvdnav, c->opt_title, 
> c->opt_chapter_start) != DVDNAV_STATUS_OK ||
> +            dvdnav_current_title_program(state->dvdnav, &cur_title, 
> &cur_pgcn, &cur_pgn) != DVDNAV_STATUS_OK) {
> +
> +            av_log(s, AV_LOG_ERROR, "Unable to start playback at title 
> %d, chapter (PTT) %d\n",
> +                                    c->opt_title, 
> c->opt_chapter_start);
> +            goto end_dvdnav_error;
> +        }
> +
> +        state->pgcn = cur_pgcn;
> +        state->entry_pgn = cur_pgn;
> +    }
> +
> +    pgc = c->vts_ifo->vts_pgcit->pgci_srp[state->pgcn - 1].pgc;
> +
> +    if (pgc->pg_playback_mode != 0) {
> +        av_log(s, AV_LOG_ERROR, "Non-sequential PGCs, such as 
> shuffles, are not supported\n");
> +
> +        return AVERROR_PATCHWELCOME;
> +    }
> +
> +    if (c->opt_trim && !dvdvideo_is_pgc_promising(s, pgc)) {
> +        av_log(s, AV_LOG_ERROR, "Title %d, PGC %d looks empty (may 
> consist of padding cells), "
> +                                "if you want to try anyway, disable 
> the -trim option\n",
> +                                c->opt_title, state->pgcn);
> +
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    if (dvdnav_angle_change(state->dvdnav, c->opt_angle) != 
> DVDNAV_STATUS_OK) {
> +        av_log(s, AV_LOG_ERROR, "Unable to start playback at angle 
> %d\n", c->opt_angle);
> +
> +        goto end_dvdnav_error;
> +    }
> +
> +    /* dvdnav_describe_title_chapters() performs several validations 
> on the title structure */
> +    /* take advantage of this side effect to increase chances of a 
> safe navigation path */
> +    state->pgc_nb_pg_est = 
> dvdnav_describe_title_chapters(state->dvdnav, c->opt_title,
> +                                                          
> &state->pgc_pg_times_est,
> +                                                          
> &state->pgc_duration_est);
> +
> +    /* dvdnav returning 0 PGs is documented as an error condition */
> +    if (!state->pgc_nb_pg_est) {
> +        av_log(s, AV_LOG_ERROR, "Unable to read chapter information 
> for title %d\n", c->opt_title);
> +
> +        goto end_dvdnav_error;
> +    }
> +
> +    state->nav_pts = dvdnav_get_current_time(state->dvdnav);
> +    state->vtsn = c->vmg_ifo->tt_srpt->title[c->opt_title - 
> 1].title_set_nr;
> +    state->pgc = pgc;
> +
> +    return 0;
> +
> +end_dvdnav_error:
> +    if (state->dvdnav)
> +        av_log(s, AV_LOG_ERROR, "dvdnav error: %s\n", 
> dvdnav_err_to_string(state->dvdnav));
> +    else
> +        av_log(s, AV_LOG_ERROR, "dvdnav could not be initialized\n");
> +
> +    return AVERROR_EXTERNAL;
> +}
> +
> +static int dvdvideo_play_next_ps_block(AVFormatContext *s, 
> DVDVideoPlaybackState *state,
> +                                       uint8_t *buf, int buf_size,
> +                                       int *p_nav_event,
> +                                       void 
> (*flush_cb)(AVFormatContext *s))
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    uint8_t nav_buf[DVDVIDEO_BLOCK_SIZE] = {0};
> +    int nav_event;
> +    int nav_len;
> +
> +    dvdnav_vts_change_event_t *e_vts;
> +    dvdnav_cell_change_event_t *e_cell;
> +    int cur_title, cur_pgcn, cur_pgn, cur_angle, cur_title_unused, 
> cur_ptt, cur_nb_angles;
> +    int is_cell_promising = 0;
> +    pci_t *e_pci;
> +    dsi_t *e_dsi;
> +
> +    if (buf_size != DVDVIDEO_BLOCK_SIZE) {
> +        av_log(s, AV_LOG_ERROR, "Invalid buffer size (expected=%d 
> actual=%d)\n",
> +                                DVDVIDEO_BLOCK_SIZE, buf_size);
> +
> +        return AVERROR(EINVAL);
> +    }
> +
> +    for (int i = 0; i < DVDVIDEO_MAX_PS_SEARCH_BLOCKS; i++) {
> +        if (ff_check_interrupt(&s->interrupt_callback))
> +            return AVERROR_EXIT;
> +
> +        if (dvdnav_get_next_block(state->dvdnav, nav_buf, &nav_event, 
> &nav_len) != DVDNAV_STATUS_OK) {
> +            av_log(s, AV_LOG_ERROR, "Unable to read next block of 
> PGC\n");
> +
> +            goto end_dvdnav_error;
> +        }
> +
> +        /* STOP event can come at any time and should be honored */
> +        if (nav_event == DVDNAV_STOP)
> +            return AVERROR_EOF;
> +
> +        if (nav_len > DVDVIDEO_BLOCK_SIZE) {
> +            av_log(s, AV_LOG_ERROR, "Invalid block size (expected<=%d 
> actual=%d)\n",
> +                                    DVDVIDEO_BLOCK_SIZE, nav_len);
> +
> +            return AVERROR_INVALIDDATA;
> +        }
> +
> +        if (dvdnav_current_title_info(state->dvdnav, &cur_title, 
> &cur_ptt) != DVDNAV_STATUS_OK) {
> +            av_log(s, AV_LOG_ERROR, "Unable to determine current title 
> coordinates\n");
> +
> +            goto end_dvdnav_error;
> +        }
> +
> +        /* we somehow navigated to a menu */
> +        if (cur_title == 0 || !dvdnav_is_domain_vts(state->dvdnav))
> +            return AVERROR_EOF;
> +
> +        if (dvdnav_current_title_program(state->dvdnav, 
> &cur_title_unused, &cur_pgcn, &cur_pgn) != DVDNAV_STATUS_OK) {
> +            av_log(s, AV_LOG_ERROR, "Unable to determine current PGC 
> coordinates\n");
> +
> +            goto end_dvdnav_error;
> +        }
> +
> +        /* we somehow left the PGC */
> +        if (state->in_pgc && cur_pgcn != state->pgcn)
> +            return AVERROR_EOF;
> +
> +        if (dvdnav_get_angle_info(state->dvdnav, &cur_angle, 
> &cur_nb_angles) != DVDNAV_STATUS_OK) {
> +            av_log(s, AV_LOG_ERROR, "Unable to determine current video 
> angle\n");
> +
> +            goto end_dvdnav_error;
> +        }
> +
> +        av_log(s, nav_event == DVDNAV_BLOCK_OK ? AV_LOG_TRACE : 
> AV_LOG_DEBUG,
> +               "new block: i=%d nav_event=%d nav_len=%d cur_title=%d "
> +               "cur_ptt=%d cur_angle=%d cur_celln=%d cur_pgcn=%d 
> cur_pgn=%d "
> +               "play_in_vts=%d play_in_pgc=%d play_in_ps=%d\n",
> +               i, nav_event, nav_len, cur_title,
> +               cur_ptt, cur_angle, state->celln, cur_pgcn, cur_pgn,
> +               state->in_vts, state->in_pgc, state->in_ps);
> +
> +        switch (nav_event) {
> +            case DVDNAV_VTS_CHANGE:
> +                if (state->in_vts)
> +                    return AVERROR_EOF;
> +
> +                e_vts = (dvdnav_vts_change_event_t *) nav_buf;
> +
> +                if (e_vts->new_vtsN == state->vtsn && 
> e_vts->new_domain == DVD_DOMAIN_VTSTitle)
> +                    state->in_vts = 1;
> +
> +                continue;
> +            case DVDNAV_CELL_CHANGE:
> +                if (!state->in_vts)
> +                    continue;
> +
> +                e_cell = (dvdnav_cell_change_event_t *) nav_buf;
> +                is_cell_promising = !c->opt_trim || 
> dvdvideo_is_cell_promising(s, state->pgc, e_cell->cellN);
> +
> +                av_log(s, AV_LOG_DEBUG, "new cell: prev=%d new=%d 
> promising=%d\n",
> +                                        state->celln, e_cell->cellN, 
> is_cell_promising);
> +
> +                if (!state->in_ps && !state->in_pgc) {
> +                    if (cur_title == c->opt_title       &&
> +                        cur_ptt == c->opt_chapter_start &&
> +                        cur_pgcn == state->pgcn         &&
> +                        cur_pgn == state->entry_pgn     &&
> +                        is_cell_promising) {
> +                        state->in_pgc = 1;
> +                    }
> +
> +                    if (c->opt_trim && !is_cell_promising)
> +                        av_log(s, AV_LOG_INFO, "Skipping padding cell 
> #%d\n", e_cell->cellN);
> +                } else if (state->celln >= e_cell->cellN || state->pgn 
> > cur_pgn) {
> +                    return AVERROR_EOF;
> +                }
> +
> +                state->celln = e_cell->cellN;
> +                state->ptt = cur_ptt;
> +                state->pgn = cur_pgn;
> +                state->nb_cells_played++;
> +
> +                continue;
> +            case DVDNAV_NAV_PACKET:
> +                if (!state->in_pgc)
> +                    continue;
> +
> +                if ((state->ptt > 0 && state->ptt > cur_ptt) ||
> +                    (c->opt_chapter_end > 0 && cur_ptt > 
> c->opt_chapter_end)) {
> +                    return AVERROR_EOF;
> +                }
> +
> +                e_pci = dvdnav_get_current_nav_pci(state->dvdnav);
> +                e_dsi = dvdnav_get_current_nav_dsi(state->dvdnav);
> +
> +                if (e_pci == NULL || e_dsi == NULL ||
> +                    e_pci->pci_gi.vobu_s_ptm > 
> e_pci->pci_gi.vobu_e_ptm) {
> +
> +                    av_log(s, AV_LOG_ERROR, "Invalid NAV packet\n");
> +                    return AVERROR_INVALIDDATA;
> +                }
> +
> +                state->vobu_duration = e_pci->pci_gi.vobu_e_ptm - 
> e_pci->pci_gi.vobu_s_ptm;
> +                state->pgc_elapsed += state->vobu_duration;
> +                state->nav_pts = 
> dvdnav_get_current_time(state->dvdnav);
> +                state->ptt = cur_ptt;
> +                state->pgn = cur_pgn;
> +
> +                av_log(s, AV_LOG_DEBUG,
> +                       "NAV packet: s_ptm=%d e_ptm=%d "
> +                       "scr=%d lbn=%d vobu_duration=%d nav_pts=%ld\n",
> +                       e_pci->pci_gi.vobu_s_ptm, 
> e_pci->pci_gi.vobu_e_ptm,
> +                       e_dsi->dsi_gi.nv_pck_scr,
> +                       e_pci->pci_gi.nv_pck_lbn, state->vobu_duration, 
> state->nav_pts);
> +
> +                if (!state->in_ps) {
> +                    av_log(s, AV_LOG_DEBUG, "navigation: locked to 
> program stream\n");
> +
> +                    state->in_ps = 1;
> +                } else {
> +                    if (state->vobu_e_ptm != e_pci->pci_gi.vobu_s_ptm) 
> {
> +                        if (flush_cb)
> +                            flush_cb(s);
> +
> +                        state->ts_offset += state->vobu_e_ptm - 
> e_pci->pci_gi.vobu_s_ptm;
> +                    }
> +                }
> +
> +                state->vobu_e_ptm = e_pci->pci_gi.vobu_e_ptm;
> +
> +                (*p_nav_event) = nav_event;
> +
> +                return nav_len;
> +            case DVDNAV_BLOCK_OK:
> +                if (!state->in_ps) {
> +                    if (state->in_pgc)
> +                        i = 0; /* necessary in case we are skipping 
> junk cells at the beginning */
> +                    continue;
> +                }
> +
> +                if (nav_len != DVDVIDEO_BLOCK_SIZE) {
> +                    av_log(s, AV_LOG_ERROR, "Invalid MPEG block size 
> (expected=%d actual=%d)\n",
> +                                            DVDVIDEO_BLOCK_SIZE, 
> nav_len);
> +
> +                    return AVERROR_INVALIDDATA;
> +                }
> +
> +                if (cur_angle != c->opt_angle) {
> +                    av_log(s, AV_LOG_ERROR, "Unexpected angle change 
> (expected=%d new=%d)\n",
> +                                            c->opt_angle, cur_angle);
> +
> +                    return AVERROR_INPUT_CHANGED;
> +                }
> +
> +                memcpy(buf, &nav_buf, nav_len);
> +
> +                if (state->pgn != cur_pgn)
> +                    av_log(s, AV_LOG_WARNING, "Unexpected PG change 
> (expected=%d actual=%d); "
> +                                              "this could be due to a 
> missed NAV packet\n",
> +                                              state->pgn, cur_pgn);
> +
> +                (*p_nav_event) = nav_event;
> +
> +                return nav_len;
> +            case DVDNAV_STILL_FRAME:
> +            case DVDNAV_WAIT:
> +            case DVDNAV_HOP_CHANNEL:
> +            case DVDNAV_HIGHLIGHT:
> +                if (state->in_ps)
> +                    return AVERROR_EOF;
> +
> +                if (nav_event == DVDNAV_STILL_FRAME) {
> +                    if (dvdnav_still_skip(state->dvdnav) != 
> DVDNAV_STATUS_OK) {
> +                        av_log(s, AV_LOG_ERROR, "Unable to skip still 
> image\n");
> +
> +                        goto end_dvdnav_error;
> +                    }
> +                }
> +
> +                if (nav_event == DVDNAV_WAIT) {
> +                    if (dvdnav_wait_skip(state->dvdnav) != 
> DVDNAV_STATUS_OK) {
> +                        av_log(s, AV_LOG_ERROR, "Unable to skip WAIT 
> event\n");
> +
> +                        goto end_dvdnav_error;
> +                    }
> +                }
> +
> +                continue;
> +            default:
> +                continue;
> +        }
> +    }
> +
> +    av_log(s, AV_LOG_ERROR, "Unable to find next program stream 
> block\n");
> +
> +    return AVERROR_INVALIDDATA;
> +
> +end_dvdnav_error:
> +    av_log(s, AV_LOG_ERROR, "dvdnav error (title=%d pgc=%d pg=%d 
> cell=%d): %s\n",
> +                            cur_title, cur_pgcn, cur_pgn, state->celln,
> +                            dvdnav_err_to_string(state->dvdnav));
> +
> +    return AVERROR_EXTERNAL;
> +}
> +
> +static int dvdvideo_chapters_setup_simple(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    uint64_t time_prev = 0;
> +    int64_t total_duration = 0;
> +
> +    int chapter_start = c->opt_chapter_start;
> +    int chapter_end = c->opt_chapter_end > 0 ? c->opt_chapter_end : 
> c->play_state.pgc_nb_pg_est - 1;
> +
> +    /* dvdnav_describe_title_chapters() describes PGs rather than 
> PTTs, so validate our range */
> +    if (chapter_start == chapter_end                ||
> +        c->play_state.pgc_nb_pg_est == 1            ||
> +        chapter_start > c->play_state.pgc_nb_pg_est ||
> +        chapter_end > c->play_state.pgc_nb_pg_est) {
> +
> +        s->duration = av_rescale_q(c->play_state.pgc_duration_est,
> +                                   DVDVIDEO_TIME_BASE_Q, 
> AV_TIME_BASE_Q);
> +        return 0;
> +    }
> +
> +    for (int i = chapter_start - 1; i < chapter_end; i++) {
> +        uint64_t time_effective = c->play_state.pgc_pg_times_est[i] - 
> c->play_state.nav_pts;
> +
> +        if (!avpriv_new_chapter(s, i, DVDVIDEO_TIME_BASE_Q, time_prev, 
> time_effective, NULL))
> +            return AVERROR(ENOMEM);
> +
> +        time_prev = time_effective;
> +        total_duration = time_effective;
> +    }
> +
> +    if (c->opt_chapter_start == 1 && c->opt_chapter_end == 0)
> +        s->duration = av_rescale_q(c->play_state.pgc_duration_est,
> +                                   DVDVIDEO_TIME_BASE_Q, 
> AV_TIME_BASE_Q);
> +    else
> +        s->duration = av_rescale_q(total_duration,
> +                                   DVDVIDEO_TIME_BASE_Q, 
> AV_TIME_BASE_Q);
> +
> +    return 0;
> +}
> +
> +static int dvdvideo_chapters_setup_preindex(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    int ret = 0, interrupt = 0;
> +    int nb_chapters = 0, last_ptt = c->opt_chapter_start;
> +    uint64_t cur_chapter_offset = 0, cur_chapter_duration = 0;
> +    DVDVideoPlaybackState state = {0};
> +
> +    uint8_t nav_buf[DVDVIDEO_BLOCK_SIZE];
> +    int nav_event;
> +
> +    if (c->opt_chapter_start == c->opt_chapter_end)
> +        return ret;
> +
> +    if ((ret = dvdvideo_play_open(s, &state)) < 0)
> +        return ret;
> +
> +    if (state.pgc->nr_of_programs == 1)
> +        goto end_close;
> +
> +    av_log(s, AV_LOG_INFO,
> +           "Indexing chapter markers, this will take a long time. 
> Please wait...\n");
> +
> +    while (!(interrupt = ff_check_interrupt(&s->interrupt_callback))) {
> +        ret = dvdvideo_play_next_ps_block(s, &state, nav_buf, 
> DVDVIDEO_BLOCK_SIZE,
> +                                          &nav_event, NULL);
> +        if (ret < 0 && ret != AVERROR_EOF)
> +            goto end_close;
> +
> +        if (nav_event != DVDNAV_NAV_PACKET && ret != AVERROR_EOF)
> +            continue;
> +
> +        if (state.ptt == last_ptt) {
> +            cur_chapter_duration += state.vobu_duration;
> +            /* ensure we add the last chapter */
> +            if (ret != AVERROR_EOF)
> +                continue;
> +        }
> +
> +        if (!avpriv_new_chapter(s, nb_chapters, DVDVIDEO_TIME_BASE_Q, 
> cur_chapter_offset,
> +                                cur_chapter_offset + 
> cur_chapter_duration, NULL)) {
> +            ret = AVERROR(ENOMEM);
> +            goto end_close;
> +        }
> +
> +        nb_chapters++;
> +        cur_chapter_offset += cur_chapter_duration;
> +        cur_chapter_duration = state.vobu_duration;
> +        last_ptt = state.ptt;
> +
> +        if (ret == AVERROR_EOF)
> +            break;
> +    }
> +
> +    if (interrupt) {
> +        ret = AVERROR_EXIT;
> +        goto end_close;
> +    }
> +
> +    if (ret < 0 && ret != AVERROR_EOF)
> +        goto end_close;
> +
> +    s->duration = av_rescale_q(state.pgc_elapsed, 
> DVDVIDEO_TIME_BASE_Q, AV_TIME_BASE_Q);
> +
> +    av_log(s, AV_LOG_INFO, "Chapter marker indexing complete\n");
> +    ret = 0;
> +
> +end_close:
> +    dvdvideo_play_close(s, &state);
> +
> +    return ret;
> +}
> +
> +static int dvdvideo_video_stream_analyze(AVFormatContext *s, 
> video_attr_t video_attr,
> +                                         DVDVideoVTSVideoStreamEntry 
> *entry)
> +{
> +    AVRational framerate;
> +    int height = 0;
> +    int width = 0;
> +    int is_pal = video_attr.video_format == 1;
> +
> +    framerate = is_pal ? (AVRational) { 25, 1 } : (AVRational) { 
> 30000, 1001 };
> +    height = is_pal ? 576 : 480;
> +
> +    if (height > 0) {
> +        switch (video_attr.picture_size) {
> +            case 0: /* D1 */
> +                width = 720;
> +                break;
> +            case 1: /* 4CIF */
> +                width = 704;
> +                break;
> +            case 2: /* Half D1 */
> +                width = 352;
> +                break;
> +            case 3: /* CIF */
> +                width = 352;
> +                height /= 2;
> +                break;
> +        }
> +    }
> +
> +    if (!width || !height) {
> +        av_log(s, AV_LOG_ERROR, "Invalid video stream parameters in 
> the IFO headers, "
> +                                "this could be an authoring error or 
> empty title "
> +                                "(video_format=%d picture_size=%d)\n",
> +                                video_attr.video_format, 
> video_attr.picture_size);
> +
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    entry->startcode = 0x1E0;
> +    entry->codec_id = !video_attr.mpeg_version ? 
> AV_CODEC_ID_MPEG1VIDEO : AV_CODEC_ID_MPEG2VIDEO;
> +    entry->width = width;
> +    entry->height = height;
> +    entry->dar = video_attr.display_aspect_ratio ? (AVRational) { 16, 
> 9 } : (AVRational) { 4, 3 };
> +    entry->framerate = framerate;
> +    entry->has_cc = !is_pal && (video_attr.line21_cc_1 || 
> video_attr.line21_cc_2);
> +
> +    return 0;
> +}
> +
> +static int dvdvideo_video_stream_add(AVFormatContext *s,
> +                                     DVDVideoVTSVideoStreamEntry 
> *entry,
> +                                     enum AVStreamParseType 
> need_parsing)
> +{
> +    AVStream *st;
> +    FFStream *sti;
> +
> +    st = avformat_new_stream(s, NULL);
> +    if (!st)
> +        return AVERROR(ENOMEM);
> +
> +    st->id = entry->startcode;
> +    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
> +    st->codecpar->codec_id = entry->codec_id;
> +    st->codecpar->width = entry->width;
> +    st->codecpar->height = entry->height;
> +    st->codecpar->format = AV_PIX_FMT_YUV420P;
> +    st->codecpar->color_range = AVCOL_RANGE_MPEG;
> +
> +#if FF_API_R_FRAME_RATE
> +    st->r_frame_rate = entry->framerate;
> +#endif
> +    st->avg_frame_rate = entry->framerate;
> +
> +    sti = ffstream(st);
> +    sti->request_probe = 0;
> +    sti->need_parsing = need_parsing;
> +    sti->display_aspect_ratio = entry->dar;
> +
> +    avpriv_set_pts_info(st, DVDVIDEO_PTS_WRAP_BITS,
> +                        DVDVIDEO_TIME_BASE_Q.num, 
> DVDVIDEO_TIME_BASE_Q.den);
> +
> +    return 0;
> +}
> +
> +static int dvdvideo_video_stream_setup(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    int ret = 0;
> +    DVDVideoVTSVideoStreamEntry entry = {0};
> +
> +    if ((ret = dvdvideo_video_stream_analyze(s, 
> c->vts_ifo->vtsi_mat->vts_video_attr, &entry)) < 0 ||
> +        (ret = dvdvideo_video_stream_add(s, &entry, 
> AVSTREAM_PARSE_HEADERS)) < 0) {
> +
> +        av_log(s, AV_LOG_ERROR, "Unable to add video stream\n");
> +        return ret;
> +    }
> +
> +    return ret;
> +}
> +
> +static int dvdvideo_audio_stream_analyze(AVFormatContext *s, 
> audio_attr_t audio_attr,
> +                                         uint16_t audio_control, 
> DVDVideoPGCAudioStreamEntry *entry)
> +{
> +    int startcode = 0;
> +    enum AVCodecID codec_id = AV_CODEC_ID_NONE;
> +    int sample_fmt = AV_SAMPLE_FMT_NONE;
> +    int sample_rate = 0;
> +    int bit_depth = 0;
> +    int nb_channels = 0;
> +    AVChannelLayout ch_layout = (AVChannelLayout) {0};
> +    char lang_dvd[3] = {0};
> +
> +    int position = (audio_control & 0x7F00) >> 8;
> +
> +    /* XXX(PATCHWELCOME): SDDS is not supported due to lack of sample 
> material */
> +    switch (audio_attr.audio_format) {
> +        case 0: /* AC3 */
> +            codec_id = AV_CODEC_ID_AC3;
> +            sample_fmt = AV_SAMPLE_FMT_FLTP;
> +            sample_rate = 48000;
> +            startcode = 0x80 + position;
> +            break;
> +        case 2: /* MP1 */
> +            codec_id = AV_CODEC_ID_MP1;
> +            sample_fmt = audio_attr.quantization ? AV_SAMPLE_FMT_S32 : 
> AV_SAMPLE_FMT_S16;
> +            sample_rate = 48000;
> +            bit_depth = audio_attr.quantization ? 20 : 16;
> +            startcode = 0x1C0 + position;
> +            break;
> +        case 3: /* MP2 */
> +            codec_id = AV_CODEC_ID_MP2;
> +            sample_fmt = audio_attr.quantization ? AV_SAMPLE_FMT_S32 : 
> AV_SAMPLE_FMT_S16;
> +            sample_rate = 48000;
> +            bit_depth = audio_attr.quantization ? 20 : 16;
> +            startcode = 0x1C0 + position;
> +            break;
> +        case 4: /* DVD PCM */
> +            codec_id = AV_CODEC_ID_PCM_DVD;
> +            sample_fmt = audio_attr.quantization ? AV_SAMPLE_FMT_S32 : 
> AV_SAMPLE_FMT_S16;
> +            sample_rate = audio_attr.sample_frequency ? 96000 : 48000;
> +            bit_depth = audio_attr.quantization == 2 ? 24 : 
> (audio_attr.quantization ? 20 : 16);
> +            startcode = 0xA0 + position;
> +            break;
> +        case 6: /* DCA */
> +            codec_id = AV_CODEC_ID_DTS;
> +            sample_fmt = AV_SAMPLE_FMT_FLTP;
> +            sample_rate = 48000;
> +            bit_depth = audio_attr.quantization == 2 ? 24 : 
> (audio_attr.quantization ? 20 : 16);
> +            startcode = 0x88 + position;
> +            break;
> +    }
> +
> +    nb_channels = audio_attr.channels + 1;
> +
> +    if (codec_id == AV_CODEC_ID_NONE     ||
> +        startcode == 0                   ||
> +        sample_fmt == AV_SAMPLE_FMT_NONE ||
> +        sample_rate == 0                 ||
> +        nb_channels == 0) {
> +
> +        av_log(s, AV_LOG_ERROR, "Invalid audio stream parameters in 
> the IFO headers, "
> +                                "this could be an authoring error or 
> dummy title "
> +                                "(stream position %d in IFO)\n", 
> position);
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    if (nb_channels == 2)
> +        ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_STEREO;
> +    else if (nb_channels == 6)
> +        ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_5POINT1;
> +    else if (nb_channels == 7)
> +        ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_6POINT1;
> +    else if (nb_channels == 8)
> +        ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_7POINT1;
> +
> +    /* XXX(PATCHWELCOME): IFO structures have metadata on karaoke 
> tracks for additional features */
> +    if (audio_attr.application_mode == 1) {
> +        entry->disposition |= AV_DISPOSITION_KARAOKE;
> +
> +        av_log(s, AV_LOG_WARNING, "Extended karaoke metadata is not 
> supported at this time "
> +                                  "(stream id=%d)\n", startcode);
> +    }
> +
> +    if (audio_attr.code_extension == 2)
> +        entry->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
> +    if (audio_attr.code_extension == 3 || audio_attr.code_extension == 
> 4)
> +        entry->disposition |= AV_DISPOSITION_COMMENT;
> +
> +    AV_WB16(lang_dvd, audio_attr.lang_code);
> +
> +    entry->startcode = startcode;
> +    entry->codec_id = codec_id;
> +    entry->sample_rate = sample_rate;
> +    entry->bit_depth = bit_depth;
> +    entry->nb_channels = nb_channels;
> +    entry->ch_layout = ch_layout;
> +    entry->lang_iso = ff_convert_lang_to(lang_dvd, 
> AV_LANG_ISO639_2_BIBL);
> +
> +    return 0;
> +}
> +
> +static int dvdvideo_audio_stream_add(AVFormatContext *s, 
> DVDVideoPGCAudioStreamEntry *entry,
> +                                     enum AVStreamParseType 
> need_parsing)
> +{
> +    AVStream *st;
> +    FFStream *sti;
> +
> +    st = avformat_new_stream(s, NULL);
> +    if (!st)
> +        return AVERROR(ENOMEM);
> +
> +    st->id = entry->startcode;
> +    st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
> +    st->codecpar->codec_id = entry->codec_id;
> +    st->codecpar->format = entry->sample_fmt;
> +    st->codecpar->sample_rate = entry->sample_rate;
> +    st->codecpar->bits_per_coded_sample = entry->bit_depth;
> +    st->codecpar->bits_per_raw_sample = entry->bit_depth;
> +    st->codecpar->ch_layout = entry->ch_layout;
> +    st->codecpar->ch_layout.nb_channels = entry->nb_channels;
> +    st->disposition = entry->disposition;
> +
> +    if (entry->lang_iso)
> +        av_dict_set(&st->metadata, "language", entry->lang_iso, 0);
> +
> +    sti = ffstream(st);
> +    sti->request_probe = 0;
> +    sti->need_parsing = need_parsing;
> +
> +    avpriv_set_pts_info(st, DVDVIDEO_PTS_WRAP_BITS,
> +                        DVDVIDEO_TIME_BASE_Q.num, 
> DVDVIDEO_TIME_BASE_Q.den);
> +
> +    return 0;
> +}
> +
> +static int dvdvideo_audio_stream_add_all(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    int ret = 0;
> +
> +    for (int i = 0; i < c->vts_ifo->vtsi_mat->nr_of_vts_audio_streams; 
> i++) {
> +        DVDVideoPGCAudioStreamEntry entry = {0};
> +
> +        if (!(c->play_state.pgc->audio_control[i] & 0x8000))
> +            continue;
> +
> +        if ((ret = dvdvideo_audio_stream_analyze(s, 
> c->vts_ifo->vtsi_mat->vts_audio_attr[i],
> +                                                 
> c->play_state.pgc->audio_control[i], &entry)) < 0)
> +            goto break_error;
> +
> +        /* IFO structures can declare duplicate entries for the same 
> startcode */
> +        for (int j = 0; j < s->nb_streams; j++)
> +            if (s->streams[j]->id == entry.startcode)
> +                continue;
> +
> +        if ((ret = dvdvideo_audio_stream_add(s, &entry, 
> AVSTREAM_PARSE_HEADERS)) < 0)
> +            goto break_error;
> +
> +        continue;
> +
> +break_error:
> +        av_log(s, AV_LOG_ERROR, "Unable to add audio stream at 
> position %d\n", i);
> +        return ret;
> +    }
> +
> +    return ret;
> +}
> +
> +static int dvdvideo_subp_stream_analyze(AVFormatContext *s, uint32_t 
> offset, subp_attr_t subp_attr,
> +                                        DVDVideoPGCSubtitleStreamEntry 
> *entry)
> +{
> +    char lang_dvd[3] = {0};
> +
> +    entry->startcode = 0x20 + (offset & 0x1F);
> +
> +    if (subp_attr.lang_extension == 9)
> +        entry->disposition |= AV_DISPOSITION_FORCED;
> +
> +    AV_WB16(lang_dvd, subp_attr.lang_code);
> +    entry->lang_iso = ff_convert_lang_to(lang_dvd, 
> AV_LANG_ISO639_2_BIBL);
> +
> +    return 0;
> +}
> +
> +static int dvdvideo_subp_stream_add(AVFormatContext *s, 
> DVDVideoPGCSubtitleStreamEntry *entry,
> +                                    enum AVStreamParseType 
> need_parsing)
> +{
> +    AVStream *st;
> +    FFStream *sti;
> +    int ret = 0;
> +
> +    st = avformat_new_stream(s, NULL);
> +    if (!st)
> +        return AVERROR(ENOMEM);
> +
> +    st->id = entry->startcode;
> +    st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
> +    st->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
> +
> +    if (entry->lang_iso)
> +        av_dict_set(&st->metadata, "language", entry->lang_iso, 0);
> +
> +    av_dict_set(&st->metadata, "VIEWPORT", 
> dvdvideo_subp_viewport_labels[entry->viewport], 0);
> +
> +    st->disposition = entry->disposition;
> +
> +    sti = ffstream(st);
> +    sti->request_probe = 0;
> +    sti->need_parsing = need_parsing;
> +
> +    avpriv_set_pts_info(st, DVDVIDEO_PTS_WRAP_BITS,
> +                        DVDVIDEO_TIME_BASE_Q.num, 
> DVDVIDEO_TIME_BASE_Q.den);
> +
> +    return ret;
> +}
> +
> +static int dvdvideo_subp_stream_add_internal(AVFormatContext *s, 
> uint32_t offset,
> +                                             subp_attr_t subp_attr,
> +                                             enum 
> DVDVideoSubpictureViewport viewport)
> +{
> +    int ret = 0;
> +    DVDVideoPGCSubtitleStreamEntry entry = {0};
> +
> +    entry.viewport = viewport;
> +
> +    if ((ret = dvdvideo_subp_stream_analyze(s, offset, subp_attr, 
> &entry)) < 0)
> +        goto end_error;
> +
> +    /* IFO structures can declare duplicate entries for the same 
> startcode */
> +    for (int i = 0; i < s->nb_streams; i++)
> +        if (s->streams[i]->id == entry.startcode)
> +            goto end;
> +
> +    if ((ret = dvdvideo_subp_stream_add(s, &entry, 
> AVSTREAM_PARSE_HEADERS)) < 0)
> +        goto end_error;
> +
> +    goto end;
> +
> +end_error:
> +    av_log(s, AV_LOG_ERROR, "Unable to add subtitle stream\n");
> +
> +end:
> +    return ret;
> +}
> +
> +static int dvdvideo_subp_stream_add_all(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    for (int i = 0; i < c->vts_ifo->vtsi_mat->nr_of_vts_subp_streams; 
> i++) {
> +        int ret = 0;
> +        uint32_t subp_control;
> +        subp_attr_t subp_attr;
> +        video_attr_t video_attr;
> +
> +        subp_control = c->play_state.pgc->subp_control[i];
> +        if (!(subp_control & 0x80000000))
> +            continue;
> +
> +        /* there can be several presentations for one SPU */
> +        /* the DAR check is flexible in order to support weird 
> authoring */
> +        video_attr = c->vts_ifo->vtsi_mat->vts_video_attr;
> +        subp_attr = c->vts_ifo->vtsi_mat->vts_subp_attr[i];
> +
> +        /* 4:3 */
> +        if (!video_attr.display_aspect_ratio) {
> +            if ((ret = dvdvideo_subp_stream_add_internal(s, 
> subp_control >> 24, subp_attr,
> +                                                         
> DVDVIDEO_SUBP_VIEWPORT_FULLSCREEN)) < 0)
> +                return ret;
> +
> +            continue;
> +        }
> +
> +        /* 16:9 */
> +        if ((    ret = dvdvideo_subp_stream_add_internal(s, 
> subp_control >> 16, subp_attr,
> +                                                         
> DVDVIDEO_SUBP_VIEWPORT_WIDESCREEN)) < 0)
> +            return ret;
> +
> +        /* 16:9 letterbox */
> +        if (video_attr.permitted_df == 2 || video_attr.permitted_df == 
> 0)
> +            if ((ret = dvdvideo_subp_stream_add_internal(s, 
> subp_control >> 8, subp_attr,
> +                                                         
> DVDVIDEO_SUBP_VIEWPORT_LETTERBOX)) < 0)
> +                return ret;
> +
> +        /* 16:9 pan-and-scan */
> +        if (video_attr.permitted_df == 1 || video_attr.permitted_df == 
> 0)
> +            if ((ret = dvdvideo_subp_stream_add_internal(s, 
> subp_control, subp_attr,
> +                                                         
> DVDVIDEO_SUBP_VIEWPORT_PANSCAN)) < 0)
> +                return ret;
> +    }
> +
> +    return 0;
> +}
> +
> +static void dvdvideo_subdemux_flush(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    if (!c->segment_started)
> +        return;
> +
> +    av_log(s, AV_LOG_DEBUG, "flushing sub-demuxer\n");
> +    avio_flush(&c->mpeg_pb.pub);
> +    ff_read_frame_flush(c->mpeg_ctx);
> +    c->segment_started = 0;
> +}
> +
> +static int dvdvideo_subdemux_read_data(void *opaque, uint8_t *buf, int 
> buf_size)
> +{
> +    AVFormatContext *s = opaque;
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    int ret = 0;
> +    int nav_event;
> +
> +    if (c->play_end)
> +        return AVERROR_EOF;
> +
> +    ret = dvdvideo_play_next_ps_block(opaque, &c->play_state, buf, 
> buf_size,
> +                                      &nav_event, 
> dvdvideo_subdemux_flush);
> +
> +    if (ret == AVERROR_EOF) {
> +        c->mpeg_pb.pub.eof_reached = 1;
> +        c->play_end = 1;
> +
> +        return AVERROR_EOF;
> +    }
> +
> +    if (ret >= 0 && nav_event == DVDNAV_NAV_PACKET)
> +        return FFERROR_REDO;
> +
> +    return ret;
> +}
> +
> +static void dvdvideo_subdemux_close(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    av_freep(&c->mpeg_pb.pub.buffer);
> +    av_freep(&c->mpeg_pb);
> +    avformat_close_input(&c->mpeg_ctx);
> +}
> +
> +static int dvdvideo_subdemux_open(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    int ret = 0;
> +
> +    if (!(c->mpeg_fmt = av_find_input_format("mpeg")))
> +        return AVERROR_DEMUXER_NOT_FOUND;
> +
> +    if (!(c->mpeg_ctx = avformat_alloc_context()))
> +        return AVERROR(ENOMEM);
> +
> +    if (!(c->mpeg_buf = av_mallocz(DVDVIDEO_BLOCK_SIZE))) {
> +        avformat_free_context(c->mpeg_ctx);
> +        c->mpeg_ctx = NULL;
> +
> +        return AVERROR(ENOMEM);
> +    }
> +
> +    ffio_init_context(&c->mpeg_pb, c->mpeg_buf, DVDVIDEO_BLOCK_SIZE, 
> 0, s,
> +                      dvdvideo_subdemux_read_data, NULL, NULL);
> +    c->mpeg_pb.pub.seekable = 0;
> +
> +    if ((ret = ff_copy_whiteblacklists(c->mpeg_ctx, s)) < 0) {
> +        avformat_free_context(c->mpeg_ctx);
> +        c->mpeg_ctx = NULL;
> +
> +        return ret;
> +    }
> +
> +    c->mpeg_ctx->flags = AVFMT_FLAG_CUSTOM_IO | AVFMT_FLAG_GENPTS;
> +    c->mpeg_ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
> +    c->mpeg_ctx->probesize = 0;
> +    c->mpeg_ctx->max_analyze_duration = 0;
> +    c->mpeg_ctx->interrupt_callback = s->interrupt_callback;
> +    c->mpeg_ctx->pb = &c->mpeg_pb.pub;
> +    c->mpeg_ctx->correct_ts_overflow = 0;
> +    c->mpeg_ctx->io_open = NULL;
> +
> +    return avformat_open_input(&c->mpeg_ctx, "", c->mpeg_fmt, NULL);
> +}
> +
> +static int dvdvideo_read_header(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    int ret = 0;
> +
> +    if (c->opt_title == 0) {
> +        av_log(s, AV_LOG_INFO, "Defaulting to title #1. "
> +                               "This is not always the main feature, 
> validation suggested.\n");
> +
> +        c->opt_title = 1;
> +    }
> +
> +    if (c->opt_pgc) {
> +        if (c->opt_pg == 0)
> +            av_log(s, AV_LOG_ERROR, "Invalid coordinates. If -pgc is 
> set, -pg must be set too.\n");
> +        else if (c->opt_chapter_start > 1 || c->opt_chapter_end > 0 || 
> c->opt_preindex)
> +            av_log(s, AV_LOG_ERROR, "-pgc is not compatible with the 
> -preindex or "
> +                                    "-chapter_start/-chapter_end 
> options\n");
> +
> +        return AVERROR(EINVAL);
> +    }
> +
> +    if ((ret = dvdvideo_ifo_open(s)) < 0)
> +        return ret;
> +
> +    if (c->opt_preindex && (ret = dvdvideo_chapters_setup_preindex(s)) 
> < 0)
> +        return ret;
> +
> +    if ((ret = dvdvideo_play_open(s, &c->play_state)) < 0   ||
> +        (ret = dvdvideo_subdemux_open(s)) < 0               ||
> +        (ret = dvdvideo_video_stream_setup(s)) < 0          ||
> +        (ret = dvdvideo_audio_stream_add_all(s)) < 0        ||
> +        (ret = dvdvideo_subp_stream_add_all(s)) < 0)
> +        return ret;
> +
> +    if (!c->opt_preindex)
> +        return dvdvideo_chapters_setup_simple(s);
> +
> +    return ret;
> +}
> +
> +static int dvdvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    int ret;
> +    enum AVMediaType st_type;
> +    int found_stream = 0;
> +
> +    if (c->play_end)
> +        return AVERROR_EOF;
> +
> +    ret = av_read_frame(c->mpeg_ctx, pkt);
> +
> +    if (ret < 0)
> +        return ret;
> +
> +    if (!c->segment_started)
> +        c->segment_started = 1;
> +
> +    st_type = 
> c->mpeg_ctx->streams[pkt->stream_index]->codecpar->codec_type;
> +
> +    /* map the subdemuxer stream to the parent demuxer's stream (by 
> startcode) */
> +    for (int i = 0; i < s->nb_streams; i++) {
> +        if (s->streams[i]->id == 
> c->mpeg_ctx->streams[pkt->stream_index]->id) {
> +            pkt->stream_index = s->streams[i]->index;
> +            found_stream = 1;
> +            break;
> +        }
> +    }
> +
> +    if (!found_stream) {
> +        av_log(s, AV_LOG_DEBUG, "discarding frame with stream that was 
> not in IFO headers "
> +                                "(stream id=%d)\n", 
> c->mpeg_ctx->streams[pkt->stream_index]->id);
> +
> +        return FFERROR_REDO;
> +    }
> +
> +    if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE) {
> +        if (!c->play_started) {
> +            /* try to start at the beginning of a GOP */
> +            if (st_type != AVMEDIA_TYPE_VIDEO || !(pkt->flags & 
> AV_PKT_FLAG_KEY)) {
> +                av_log(s, AV_LOG_VERBOSE, "Discarding packet which is 
> not a video keyframe or "
> +                                          "with unset PTS/DTS at 
> start\n");
> +                return FFERROR_REDO;
> +            }
> +
> +            c->first_pts = pkt->pts;
> +            c->play_started = 1;
> +        }
> +
> +        pkt->pts += c->play_state.ts_offset - c->first_pts;
> +        pkt->dts += c->play_state.ts_offset - c->first_pts;
> +
> +        if (pkt->pts < 0) {
> +            av_log(s, AV_LOG_VERBOSE, "Discarding packet with negative 
> PTS (st=%d pts=%ld), "
> +                                      "this is OK at start of 
> playback\n",
> +                                      pkt->stream_index, pkt->pts);
> +
> +            return FFERROR_REDO;
> +        }
> +    } else {
> +        av_log(s, AV_LOG_WARNING, "Unset PTS or DTS @ st=%d pts=%ld 
> dts=%ld\n",
> +                                  pkt->stream_index, pkt->pts, 
> pkt->dts);
> +    }
> +
> +    av_log(s, AV_LOG_TRACE, "st=%d pts=%ld dts=%ld ts_offset=%ld 
> first_pts=%ld\n",
> +                            pkt->stream_index, pkt->pts, pkt->dts,
> +                            c->play_state.ts_offset, c->first_pts);
> +
> +    return c->play_end ? AVERROR_EOF : 0;
> +}
> +
> +static int dvdvideo_close(AVFormatContext *s)
> +{
> +    DVDVideoDemuxContext *c = s->priv_data;
> +
> +    dvdvideo_subdemux_close(s);
> +    dvdvideo_play_close(s, &c->play_state);
> +    dvdvideo_ifo_close(s);
> +
> +    return 0;
> +}
> +
> +#define OFFSET(x) offsetof(DVDVideoDemuxContext, x)
> +static const AVOption dvdvideo_options[] = {
> +    {"angle",           "playback angle number",                       
>              OFFSET(opt_angle),          AV_OPT_TYPE_INT,    { .i64=1 
> },     1,          9,         AV_OPT_FLAG_DECODING_PARAM },
> +    {"chapter_end",     "exit chapter (PTT) number (0=end)",           
>              OFFSET(opt_chapter_end),    AV_OPT_TYPE_INT,    { .i64=0 
> },     0,          99,        AV_OPT_FLAG_DECODING_PARAM },
> +    {"chapter_start",   "entry chapter (PTT) number",                  
>              OFFSET(opt_chapter_start),  AV_OPT_TYPE_INT,    { .i64=1 
> },     1,          99,        AV_OPT_FLAG_DECODING_PARAM },
> +    {"pg",              "entry PG number (0=auto)",                    
>              OFFSET(opt_pg),             AV_OPT_TYPE_INT,    { .i64=0 
> },     0,          255,       AV_OPT_FLAG_DECODING_PARAM },
> +    {"pgc",             "entry PGC number (0=auto)",                   
>              OFFSET(opt_pgc),            AV_OPT_TYPE_INT,    { .i64=0 
> },     0,          999,       AV_OPT_FLAG_DECODING_PARAM },
> +    {"preindex",        "enable for accurate chapter markers, slow 
> (2-pass read)",  OFFSET(opt_preindex),       AV_OPT_TYPE_BOOL,   { 
> .i64=0 },     0,          1,         AV_OPT_FLAG_DECODING_PARAM },
> +    {"region",          "playback region number (0=free)",             
>              OFFSET(opt_region),         AV_OPT_TYPE_INT,    { .i64=0 
> },     0,          8,         AV_OPT_FLAG_DECODING_PARAM },
> +    {"title",           "title number (0=auto)",                       
>              OFFSET(opt_title),          AV_OPT_TYPE_INT,    { .i64=0 
> },     0,          99,        AV_OPT_FLAG_DECODING_PARAM },
> +    {"trim",            "trim padding cells from start",               
>              OFFSET(opt_trim),           AV_OPT_TYPE_BOOL,   { .i64=1 
> },     0,          1,         AV_OPT_FLAG_DECODING_PARAM },
> +    {NULL}
> +};
> +
> +static const AVClass dvdvideo_class = {
> +    .class_name = "DVD-Video demuxer",
> +    .item_name  = av_default_item_name,
> +    .option     = dvdvideo_options,
> +    .version    = LIBAVUTIL_VERSION_INT
> +};
> +
> +const AVInputFormat ff_dvdvideo_demuxer = {
> +    .name           = "dvdvideo",
> +    .long_name      = NULL_IF_CONFIG_SMALL("DVD-Video"),
> +    .priv_class     = &dvdvideo_class,
> +    .priv_data_size = sizeof(DVDVideoDemuxContext),
> +    .flags          = AVFMT_NOFILE | AVFMT_SHOW_IDS | AVFMT_TS_DISCONT 
> | AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH,
> +    .flags_internal = FF_FMT_INIT_CLEANUP,
> +    .read_close     = dvdvideo_close,
> +    .read_header    = dvdvideo_read_header,
> +    .read_packet    = dvdvideo_read_packet
> +};
>
> _______________________________________________
> ffmpeg-cvslog mailing list
> ffmpeg-cvslog at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
>
> To unsubscribe, visit link above, or email
> ffmpeg-cvslog-request at ffmpeg.org with subject "unsubscribe".

-- 
Jean-Baptiste Kempf -  President
+33 672 704 734


More information about the ffmpeg-devel mailing list