[FFmpeg-devel] [PATCH v7 1/2] libavformat/dvdvideo: add DVD-Video demuxer powered by libdvdnav and libdvdread
Marth64
marth64 at proxyid.net
Wed Feb 7 02:54:33 EET 2024
Thank you for your time and detailed review. I will clean all this up and
send v9
On Tue, Feb 6, 2024 at 6:53 PM Stefano Sabatini <stefasab at gmail.com> wrote:
> On date Sunday 2024-02-04 23:48:25 -0600, Marth64 wrote:
> > Sorry for the quick follow-up to v6, I wanted to get this update out now
> hopefully
> > before v6 is actually reviewed. v7 fixes a few documentation typos,
> options descriptions,
> > and log messages: nothing major. I also flattened this out to be a
> 2-patch set
> > with subtitle palette support.
> >
> > This is the result of >1yr of research and I am now very satisfied with
> it's result.
> > I will not make any more changes at this point unless it is outcome from
> a review.
> > If the community decides to merge it, I am happy to continue to improve
> it with support for
> > seeking, probing, and tests.
> >
> > Thank you so much,
> >
> >
> > Signed-off-by: Marth64 <marth64 at proxyid.net>
> > ---
> > Changelog | 2 +
> > configure | 8 +
> > doc/demuxers.texi | 129 ++++
> > libavformat/Makefile | 1 +
> > libavformat/allformats.c | 1 +
> > libavformat/dvdvideodec.c | 1410 +++++++++++++++++++++++++++++++++++++
> > 6 files changed, 1551 insertions(+)
> > create mode 100644 libavformat/dvdvideodec.c
> >
> > diff --git a/Changelog b/Changelog
> > index c5fb21d198..88653bc6d3 100644
> > --- a/Changelog
> > +++ b/Changelog
> > @@ -24,6 +24,8 @@ version <next>:
> > - ffmpeg CLI options may now be used as -/opt <path>, which is
> equivalent
> > to -opt <contents of file <path>>
> > - showinfo bitstream filter
> > +- DVD-Video demuxer, powered by libdvdnav and libdvdread
> > +
> >
> > version 6.1:
> > - libaribcaption decoder
> > diff --git a/configure b/configure
> > index 68f675a4bc..70c33ec96d 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
> > @@ -3520,6 +3524,8 @@ 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"
> > @@ -6761,6 +6767,8 @@ 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..ad0906f6ec 100644
> > --- a/doc/demuxers.texi
> > +++ b/doc/demuxers.texi
> > @@ -285,6 +285,135 @@ 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 fully handled by libdvdnav, and structure
> parsing by libdvdread.
>
> > +ffmpeg must be built with GPL library support available as well as the
> switches
> > + at code{--enable-libdvdnav} and @code{--enable-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.
>
> unrelated, but it might be useful to have a -list-titles option to
> show this information
>
> > +If not specified, the demuxer will default to title 1 which works for
> many discs.
> > +However, due to the flexibility of DVD-Video, 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.
>
> nit: FFmpeg (ffmpeg is usually a reference to the CLI command, while
> FFmpeg refers to the projects and set of all libraries/tools)
>
> > +
> > + 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 which, for a typical movie, are
> 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
>
> here and below: you might use @var{TYPE} to denote the argument/type of the
> option
>
> > +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
> > +The chapter, or PTT (part-of-title), number to start at. Default is 1.
> > +
> > + at item chapter_end
> > +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
> > +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
> > +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
> > +The entry PGC to start playback, in conjunction with @option{pg}.
> > +Alternative to setting @option{title}.
>
> > +Chapter markers not supported at this time.
>
> nit: are not supported ...
>
> > +Default is 0, automatically resolve from value of @option{title}.
> > +
> > + at item pg
> > +The entry PG to start playback, in conjunction with @option{pgc}.
> > +Alternative to setting @option{title}.
> > +Chapter markers not supported at this time.
>
> are not
>
> > +Default is 0, automatically resolve from value of @option{title}.
> > +
> > + at item preindex
> > +Enable this to have accurate chapter (PTT) markers and duration
> measurement,
> > +which requires a slow second pass read in order to index the chapter
>
> > +timestamps from NAV packets. This is non-ideal extra work for physical
> DVD drives.
>
> note: if this is non-idela for physical DVD drivers, what's the
> recommended use case?
>
> > +Not compatible with @option{pgc} and @option{pg}.
> > +Default is 0, false.
> > +
> > + at item trim
> > +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 05b9b8a115..df69734877 100644
> > --- a/libavformat/Makefile
> > +++ b/libavformat/Makefile
> > @@ -192,6 +192,7 @@ 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..2e363a4a22
> > --- /dev/null
> > +++ b/libavformat/dvdvideodec.c
> > @@ -0,0 +1,1410 @@
> > +/*
> > + * 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 "libavcodec/avcodec.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
> > +};
> > +const char* VIEWPORT_LABELS[4] = { "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;
> > + char *lang_iso;
> > +} DVDVideoPGCAudioStreamEntry;
> > +
> > +typedef struct DVDVideoPGCSubtitleStreamEntry {
> > + int startcode;
> > + int disposition;
> > + char *lang_iso;
> > + enum DVDVideoSubpictureViewport viewport;
> > +} 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_vobus_played; /* number of VOBUs
> 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 PTS 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
> libdvdnav */
> > +} DVDVideoPlaybackState;
> > +
> > +typedef struct DVDVideoDemuxContext {
> > + const AVClass *class;
> > +
> > + /* options */
> > + int opt_title; /* the
> user-provided title number (1-indexed) */
> > + int opt_chapter_start; /* the
> user-provided entry PTT (1-indexed) */
> > + int opt_chapter_end; /* the
> user-provided exit PTT (0 for last) */
> > + int opt_pgc; /* the
> user-provided PGC number (1-indexed) */
> > + int opt_pg; /* the
> user-provided PG number (1-indexed) */
> > + int opt_angle; /* the
> user-provided angle number (1-indexed) */
> > + int opt_region; /* the
> user-provided region digit */
> > + int opt_preindex; /* pre-indexing
> mode (2-pass read) */
> > + int opt_trim; /* trim padding
> cells at beginning and end */
> > +
> > + /* 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 */
> > + 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 play_seg_started; /* signal that
> segment has started */
> > + int64_t first_pts; /* the starting PTS
> offset of the PGC */
> > + uint64_t duration_ptm; /* total duration
> in DVD MPEG timebase */
> > +} DVDVideoDemuxContext;
> > +
> > +static void dvdvideo_libdvdread_log(void *opaque, dvd_logger_level_t
> level,
> > + const char *msg, va_list msg_va)
> > +{
> > + AVFormatContext *s = opaque;
> > + int lavu_level;
> > +
> > + char msg_buf[DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE] = {0};
> > + vsnprintf(msg_buf, DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE, msg, msg_va);
> > +
> > + switch (level) {
> > + case DVD_LOGGER_LEVEL_ERROR:
> > + lavu_level = AV_LOG_ERROR;
> > + break;
> > + case DVD_LOGGER_LEVEL_WARN:
> > + lavu_level = AV_LOG_WARNING;
> > + break;
> > + /* dvdread's info messages are relatively very verbose, muffle
> them as debug */
> > + case DVD_LOGGER_LEVEL_INFO:
> > + case DVD_LOGGER_LEVEL_DEBUG:
> > + default:
> > + lavu_level = AV_LOG_DEBUG;
> > + }
> > +
> > + 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;
> > + int lavu_level;
> > +
> > + char msg_buf[DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE] = {0};
> > + vsnprintf(msg_buf, DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE, msg, msg_va);
> > +
> > + switch (level) {
> > + case DVDNAV_LOGGER_LEVEL_ERROR:
> > + lavu_level = AV_LOG_ERROR;
> > + break;
> > + case DVDNAV_LOGGER_LEVEL_WARN:
> > + /* some discs have invalid language codes set for their
> menus, muffle the noise */
> > + lavu_level = av_strstart(msg, "Language", NULL) ?
> AV_LOG_DEBUG : AV_LOG_WARNING;
> > + break;
> > + /* dvdnav's info messages are relatively very verbose, muffle
> them as debug */
> > + case DVDNAV_LOGGER_LEVEL_INFO:
> > + case DVDNAV_LOGGER_LEVEL_DEBUG:
> > + default:
> > + lavu_level = AV_LOG_DEBUG;
> > + }
> > +
> > + 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
> parts)\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 the VTS IFO
> structure\n");
> > +
> > + 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 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) < 0)
> > + av_log(s, AV_LOG_ERROR, "Unable to cleanly close dvdnav\n");
>
> nit: in case this has consquence, you might print the error code in
> the log
>
> > +}
> > +
> > +static int dvdvideo_play_open(AVFormatContext *s, DVDVideoPlaybackState
> *state)
> > +{
> > + DVDVideoDemuxContext *c = s->priv_data;
> > +
> > + int ret = 0;
> > + dvdnav_logger_cb dvdnav_log_cb;
> > + dvdnav_status_t dvdnav_open_status;
> > + int cur_title, cur_pgcn, cur_pgn;
> > + pgc_t *pgc;
> > +
> > + int32_t disc_region_mask;
> > + int32_t player_region_mask;
> > +
> > + 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) {
>
> nit+: here and below, weird style
>
> usually || is put at the EOL and conditions are aligned, as in
>
> if (foo ||
> bar ||
> baz) {
> ...
> }
>
> > + av_log(s, AV_LOG_ERROR, "Unable to open the DVD for
> playback\n");
> > +
> > + return AVERROR_EXTERNAL;
> > + }
> > +
> > + 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);
> > +
> > + return AVERROR_EXTERNAL;
> > + }
> > +
> > + 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);
> > +
> > + return AVERROR_EXTERNAL;
> > + }
> > +
> > + 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);
> > +
> > + return AVERROR_EXTERNAL;
> > + }
> > +
> > + 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 (dvdnav_angle_change(state->dvdnav, c->opt_angle) !=
> DVDNAV_STATUS_OK) {
>
> > + av_log(s, AV_LOG_ERROR, "Unable to start playback at the given
> angle\n");
>
> nit: you might mention the failing angle here
>
> > +
> > + return AVERROR_EXTERNAL;
> > + }
> > +
> > + /* dvdnav_describe_title_chapters() performs several safety checks
> on the title structure */
> > + /* take advantage of this side effect to ensure 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);
> > + if (!state->pgc_nb_pg_est) {
> > + av_log(s, AV_LOG_ERROR, "Unable to validate title structure\n");
> > +
> > + return AVERROR_EXTERNAL;
> > + }
> > +
> > + 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 ret;
> > +}
> > +
> > +static int dvdvideo_play_is_cell_promising(AVFormatContext *s,
> DVDVideoPlaybackState *state,
> > + int celln)
> > +{
> > + DVDVideoDemuxContext *c = s->priv_data;
> > + dvd_time_t cell_duration;
> > +
> > + if (!c->opt_trim)
> > + return 1;
> > +
> > + cell_duration = state->pgc->cell_playback[celln - 1].playback_time;
> > +
> > + return cell_duration.second >= 1 || cell_duration.minute >= 1 ||
> cell_duration.hour >= 1;
> > +}
> > +
> > +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\n");
>
> you might mention the failing size (Invalid buffer size %d, the DVD block
> size %d was expected)
>
> > +
> > + return AVERROR(ENOMEM);
>
> Not sure this is the correct error (it's not an allocation error)
> maybe more invaliddata or 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");
> > +
> > + return AVERROR_INVALIDDATA;
> > + }
> > +
> > + /* some discs follow NOPs with a premature stop event */
> > + if (nav_event == DVDNAV_STOP)
> > + return AVERROR_EOF;
> > +
> > + if (nav_len > DVDVIDEO_BLOCK_SIZE) {
> > + av_log(s, AV_LOG_ERROR, "Invalid block size\n");
> > +
> > + 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 validate title
> coordinates\n");
> > +
> > + return AVERROR_INVALIDDATA;
> > + }
> > +
> > + /* 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 validate PGC
> coordinates\n");
> > +
> > + return AVERROR_INVALIDDATA;
> > + }
> > +
> > + /* 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 validate angle
> coordinates\n");
> > +
> > + return AVERROR_INVALIDDATA;
> > + }
> > +
> > + 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);
>
> nit: weird indent
>
> > +
> > + 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 = dvdvideo_play_is_cell_promising(s,
> state, 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) {
>
> nit: weird align
>
> > + 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;
> > +
> > + 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;
> > + state->nb_vobus_played++;
> > +
> > + av_log(s, AV_LOG_DEBUG, "NAV pack: 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 block size\n");
> > +
> > + return AVERROR_INVALIDDATA;
> > + }
> > +
> > + if (cur_angle != c->opt_angle) {
> > + av_log(s, AV_LOG_ERROR, "Unexpected angle
> change\n");
> > +
> > + return AVERROR_INPUT_CHANGED;
> > + }
> > +
> > + memcpy(buf, &nav_buf, nav_len);
> > +
> > + /* in case NAV packet is missed */
> > + state->ptt = cur_ptt;
> > + 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)
> > + dvdnav_still_skip(state->dvdnav);
> > + if (nav_event == DVDNAV_WAIT)
> > + dvdnav_wait_skip(state->dvdnav);
> > +
> > + continue;
> > + case DVDNAV_STOP:
> > + return AVERROR_EOF;
> > + default:
> > + continue;
> > + }
> > + }
> > +
> > + av_log(s, AV_LOG_ERROR, "Unable to find next program stream
> block\n");
> > +
> > + return AVERROR_INVALIDDATA;
> > +}
> > +
> > +static int dvdvideo_pgc_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;
> > +
> > + uint8_t nav_buf[DVDVIDEO_BLOCK_SIZE];
> > + int nav_event;
> > +
> > + if (c->opt_chapter_start == c->opt_chapter_end)
> > + return 0;
> > +
> > + av_log(s, AV_LOG_INFO,
> > + "Indexing chapter markers, this will take a long time.
> Please wait...\n");
> > +
> > + state = av_mallocz(sizeof(DVDVideoPlaybackState));
> > + if ((ret = dvdvideo_play_open(s, state)) < 0) {
> > + av_freep(&state);
> > + return ret;
> > + }
> > +
> > + 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_free;
> > +
> > + 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)) {
> > + av_log(s, AV_LOG_ERROR, "Unable to allocate chapter\n");
>
> ret is not set in this case
>
> > +
> > + goto end_free;
> > + }
> > +
> > + 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_free;
> > + }
> > +
> > + if (ret < 0 && ret != AVERROR_EOF)
> > + goto end_free;
> > +
> > + s->duration = av_rescale_q(state->pgc_elapsed,
> DVDVIDEO_TIME_BASE_Q, AV_TIME_BASE_Q);
> > + c->duration_ptm = state->pgc_elapsed;
> > +
> > + av_log(s, AV_LOG_INFO, "Chapter marker indexing complete\n");
> > + ret = 0;
> > +
> > +end_free:
> > + dvdvideo_play_close(s, state);
> > + av_freep(&state);
> > +
> > + return ret;
> > +}
> > +
> > +static int dvdvideo_pgc_chapters_setup(AVFormatContext *s)
> > +{
> > + DVDVideoDemuxContext *c = s->priv_data;
> > +
> > + uint64_t time_prev = 0;
> > + int64_t total_duration = 0;
> > +
> > + int chapter_start = c->opt_chapter_start - 1;
> > + int chapter_end = c->opt_chapter_end > 0 ? c->opt_chapter_end :
> c->play_state.pgc_nb_pg_est - 1;
> > +
> > + if (chapter_start == chapter_end || c->play_state.pgc_nb_pg_est ==
> 1) {
> > + 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; 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)) {
> > + av_log(s, AV_LOG_ERROR, "Unable to allocate chapter\n");
> > + 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_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 dimensions\n");
>
> you might print the actual size to help debug impossible cases
>
> > +
> > + 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;
> > +
> > + st->codecpar->framerate = entry->framerate;
> > +#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;
> > + sti->avctx->framerate = entry->framerate;
> > +
> > + if (entry->has_cc)
> > + sti->avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
> > +
> > + 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;
> > +
> > + DVDVideoVTSVideoStreamEntry *entry = NULL;
> > + int ret = 0;
> > +
>
> > + entry = av_mallocz(sizeof(DVDVideoVTSVideoStreamEntry));
>
> you might check for failure
>
> > +
> > + if ((ret = dvdvideo_video_stream_analyze(s,
> c->vts_ifo->vtsi_mat->vts_video_attr, entry)) < 0
> > + || (ret = dvdvideo_video_stream_add(c->mpeg_ctx, entry,
> AVSTREAM_PARSE_FULL)) < 0
> > + || (ret = dvdvideo_video_stream_add(s, entry,
> AVSTREAM_PARSE_HEADERS)) < 0) {
> > + av_freep(&entry);
>
> > + av_log(s, AV_LOG_ERROR, "Unable to allocate video stream\n");
>
> misleading error message, I'd say: Unable to add video stream
>
> > +
> > + return ret;
> > + }
> > +
> > + av_freep(&entry);
> > +
> > + 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 parameters\n");
>
> please provide some context to help debug impossible cases
>
> > +
> > + 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;
> > +
> > + 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 = (char *) 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 = NULL;
> > +
> > + if (!(c->play_state.pgc->audio_control[i] & 0x8000))
> > + continue;
> > +
> > + entry = av_mallocz(sizeof(DVDVideoPGCAudioStreamEntry));
> > + if (!entry)
> > + return AVERROR(ENOMEM);
> > +
> > + 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_free_and_error;
> > +
> > + if (c->vts_ifo->vtsi_mat->vts_audio_attr[i].application_mode ==
> 1)
> > + av_log(s, AV_LOG_WARNING, "Karaoke metadata in stream %d
> will not be retained\n",
> > + entry->startcode);
> > +
> > + /* 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)
> > + goto continue_free;
> > +
> > + if ((ret = dvdvideo_audio_stream_add(c->mpeg_ctx, entry,
> AVSTREAM_PARSE_FULL)) < 0
> > + || (ret = dvdvideo_audio_stream_add(s, entry,
> AVSTREAM_PARSE_HEADERS)) < 0)
> > + goto break_free_and_error;
> > +
> > +continue_free:
> > + av_freep(&entry);
> > + continue;
> > +
> > +break_free_and_error:
> > + av_freep(&entry);
>
> > + av_log(s, AV_LOG_ERROR, "Unable to allocate audio stream\n");
>
> ditto: unable to "add" audio stream?
>
> > + return ret;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int dvdvideo_subp_stream_analyze(AVFormatContext *s, uint32_t
> offset, subp_attr_t subp_attr,
> > + DVDVideoPGCSubtitleStreamEntry
> *entry)
> > +{
> > + DVDVideoDemuxContext *c = s->priv_data;
> > +
> > + 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 = (char *) 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",
> 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)
> > +{
> > + DVDVideoDemuxContext *c = s->priv_data;
> > +
> > + DVDVideoPGCSubtitleStreamEntry *entry = NULL;
> > + int ret = 0;
> > +
>
> > + entry = av_mallocz(sizeof(DVDVideoPGCSubtitleStreamEntry));
>
> missing check
>
> > + entry->viewport = viewport;
> > +
> > + if ((ret = dvdvideo_subp_stream_analyze(s, offset, subp_attr,
> entry)) < 0)
> > + goto end_free_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_free;
> > +
> > + if ((ret = dvdvideo_subp_stream_add(c->mpeg_ctx, entry,
> AVSTREAM_PARSE_FULL)) < 0
> > + || (ret = dvdvideo_subp_stream_add(s, entry,
> AVSTREAM_PARSE_HEADERS)) < 0)
> > + goto end_free_error;
> > +
> > + goto end_free;
> > +
> > +end_free_error:
>
> > + av_log(s, AV_LOG_ERROR, "Unable to allocate subtitle stream\n");
>
> ditto
>
> > +
> > +end_free:
> > + av_freep(&entry);
> > +
> > + return ret;
> > +}
> > +
> > +static int dvdvideo_subp_stream_add_all(AVFormatContext *s)
> > +{
> > + DVDVideoDemuxContext *c = s->priv_data;
> > +
> > + if (!c->vts_ifo->vtsi_mat->nr_of_vts_subp_streams)
> > + return 0;
> > +
> > + 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 */
> > + /* for now, be flexible with the DAR check due to 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->play_seg_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->play_seg_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);
> > +
> > + 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);
> > +
> > + 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->io_open = NULL;
> > +
> > + if ((ret = avformat_open_input(&c->mpeg_ctx, "", c->mpeg_fmt,
> NULL)) < 0) {
> > + avformat_free_context(c->mpeg_ctx);
> > +
> > + return ret;
>
> you can drop this
>
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +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_pgc_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_pgc_chapters_setup(s);
> > +
> > + return ret;
> > +}
> > +
> > +static int dvdvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
> > +{
> > + DVDVideoDemuxContext *c = s->priv_data;
> > +
> > + int ret;
> > + enum AVMediaType st_type;
> > + int64_t cur_delta = 0;
> > +
> > + if (c->play_end)
> > + return AVERROR_EOF;
> > +
> > + ret = av_read_frame(c->mpeg_ctx, pkt);
> > +
> > + if (ret < 0)
> > + return ret;
> > +
> > + if (!c->play_seg_started)
> > + c->play_seg_started = 1;
> > +
> > + if (pkt->stream_index >= s->nb_streams) {
>
> > + av_log(s, AV_LOG_DEBUG, "discarding frame with unknown
> stream\n");
>
> print the unrecongnized stream index
>
> > + goto skip_redo;
> > + }
> > +
> > + st_type =
> c->mpeg_ctx->streams[pkt->stream_index]->codecpar->codec_type;
> > +
> > + if (!c->play_started) {
> > + if (st_type != AVMEDIA_TYPE_VIDEO || pkt->pts == AV_NOPTS_VALUE
> > + || pkt->dts == AV_NOPTS_VALUE
> > + || !(pkt->flags &
> AV_PKT_FLAG_KEY)) {
>
> > + av_log(s, AV_LOG_DEBUG, "discarding non-video-keyframe at
> start\n");
>
> of packet with unset PTS/DTS at start
>
> > + goto skip_redo;
> > + }
> > +
> > + c->first_pts = pkt->pts;
> > + c->play_started = 1;
> > +
> > + pkt->pts = 0;
> > + pkt->dts = c->play_state.ts_offset - pkt->pts;
> > + } else {
> > + cur_delta = c->play_state.ts_offset - c->first_pts;
> > +
> > + if (c->play_state.nb_vobus_played == 1 && (pkt->pts ==
> AV_NOPTS_VALUE
> > + || pkt->dts ==
> AV_NOPTS_VALUE
> > + || (pkt->pts +
> cur_delta) < 0)) {
> > + av_log(s, AV_LOG_DEBUG, "discarding frame with negative or
> unset timestamp "
> > + "(this is OK at the start of the
> first playback VOBU)\n");
> > + goto skip_redo;
> > + }
> > +
> > + if (pkt->pts != AV_NOPTS_VALUE)
> > + pkt->pts += cur_delta;
> > + if (pkt->dts != AV_NOPTS_VALUE)
> > + pkt->dts += cur_delta;
> > + }
> > +
> > + 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);
> > + if (pkt->pts < 0)
> > + av_log(s, AV_LOG_WARNING, "Invalid frame PTS @ st=%d pts=%ld
> dts=%ld\n",
> > + pkt->stream_index, pkt->pts,
> pkt->dts);
> > +
> > + return c->play_end ? AVERROR_EOF : 0;
> > +
> > +skip_redo:
> > + av_packet_unref(pkt);
> > + return FFERROR_REDO;
> > +}
> > +
> > +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
> > +};
>
> LGTM otherwise, thanks.
>
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