[FFmpeg-devel] [PATCH] avformat/movenc: Add more error checking when writing sample entries.
Nikolas Bowe
nbowe at google.com
Tue Feb 5 03:02:19 EET 2019
Fixes a problem where a sample entry which cannot be written correctly appears to succeed, but produces an invalid file.
For example, this command:
ffmpeg -f lavfi -i sine=frequency=1000:duration=5 -codec:a ac3 -movflags +empty_moov -frag_duration 5000000 /tmp/foo.mp4
produced a file with the ac-3 sample entry, but no AC3SpecificBox (dac3) child, which is invalid according to ETSI TS 102 366.
---
libavformat/movenc.c | 73 ++++++++++++++++++++++++++++----------------
1 file changed, 47 insertions(+), 26 deletions(-)
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 65be2968a1..3a1ce40e4f 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -320,8 +320,12 @@ static int mov_write_ac3_tag(AVIOContext *pb, MOVTrack *track)
uint8_t buf[3];
int fscod, bsid, bsmod, acmod, lfeon, frmsizecod;
- if (track->vos_len < 7)
- return -1;
+ if (track->vos_len < 7) {
+ av_log(pb, AV_LOG_ERROR,
+ "Cannot write moov atom before AC3 packets."
+ " Set the delay_moov flag to fix this.\n");
+ return AVERROR(EINVAL);
+ }
avio_wb32(pb, 11);
ffio_wfourcc(pb, "dac3");
@@ -538,8 +542,11 @@ static int mov_write_eac3_tag(AVIOContext *pb, MOVTrack *track)
struct eac3_info *info;
int size, i;
- if (!track->eac3_priv)
+ if (!track->eac3_priv) {
+ av_log(pb, AV_LOG_ERROR,
+ "Cannot write moov atom before EAC3 packets parsed.\n");
return AVERROR(EINVAL);
+ }
info = track->eac3_priv;
size = 2 + ((34 * (info->num_ind_sub + 1) + 7) >> 3);
@@ -1022,6 +1029,7 @@ static int mov_write_audio_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContex
int64_t pos = avio_tell(pb);
int version = 0;
uint32_t tag = track->tag;
+ int ret = 0;
if (track->mode == MODE_MOV) {
if (track->timescale > UINT16_MAX || !track->par->channels) {
@@ -1125,34 +1133,41 @@ static int mov_write_audio_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContex
track->par->codec_id == AV_CODEC_ID_QDM2 ||
(mov_pcm_le_gt16(track->par->codec_id) && version==1) ||
(mov_pcm_be_gt16(track->par->codec_id) && version==1)))
- mov_write_wave_tag(s, pb, track);
+ ret = mov_write_wave_tag(s, pb, track);
else if (track->tag == MKTAG('m','p','4','a'))
- mov_write_esds_tag(pb, track);
+ ret = mov_write_esds_tag(pb, track);
else if (track->par->codec_id == AV_CODEC_ID_AMR_NB)
- mov_write_amr_tag(pb, track);
+ ret = mov_write_amr_tag(pb, track);
else if (track->par->codec_id == AV_CODEC_ID_AC3)
- mov_write_ac3_tag(pb, track);
+ ret = mov_write_ac3_tag(pb, track);
else if (track->par->codec_id == AV_CODEC_ID_EAC3)
- mov_write_eac3_tag(pb, track);
+ ret = mov_write_eac3_tag(pb, track);
else if (track->par->codec_id == AV_CODEC_ID_ALAC)
- mov_write_extradata_tag(pb, track);
+ ret = mov_write_extradata_tag(pb, track);
else if (track->par->codec_id == AV_CODEC_ID_WMAPRO)
- mov_write_wfex_tag(s, pb, track);
+ ret = mov_write_wfex_tag(s, pb, track);
else if (track->par->codec_id == AV_CODEC_ID_FLAC)
- mov_write_dfla_tag(pb, track);
+ ret = mov_write_dfla_tag(pb, track);
else if (track->par->codec_id == AV_CODEC_ID_OPUS)
- mov_write_dops_tag(pb, track);
+ ret = mov_write_dops_tag(pb, track);
else if (track->vos_len > 0)
- mov_write_glbl_tag(pb, track);
+ ret = mov_write_glbl_tag(pb, track);
- if (track->mode == MODE_MOV && track->par->codec_type == AVMEDIA_TYPE_AUDIO)
- mov_write_chan_tag(s, pb, track);
+ if (ret < 0)
+ return ret;
- if (mov->encryption_scheme != MOV_ENC_NONE) {
- ff_mov_cenc_write_sinf_tag(track, pb, mov->encryption_kid);
+ if (track->mode == MODE_MOV && track->par->codec_type == AVMEDIA_TYPE_AUDIO
+ && ((ret = mov_write_chan_tag(s, pb, track)) < 0)) {
+ return ret;
}
- return update_size(pb, pos);
+ if (mov->encryption_scheme != MOV_ENC_NONE
+ && ((ret = ff_mov_cenc_write_sinf_tag(track, pb, mov->encryption_kid)) < 0)) {
+ return ret;
+ }
+
+ ret = update_size(pb, pos);
+ return ret;
}
static int mov_write_d263_tag(AVIOContext *pb)
@@ -2217,22 +2232,27 @@ static int mov_write_gpmd_tag(AVIOContext *pb, const MOVTrack *track)
static int mov_write_stsd_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext *mov, MOVTrack *track)
{
int64_t pos = avio_tell(pb);
+ int ret = 0;
avio_wb32(pb, 0); /* size */
ffio_wfourcc(pb, "stsd");
avio_wb32(pb, 0); /* version & flags */
avio_wb32(pb, 1); /* entry count */
if (track->par->codec_type == AVMEDIA_TYPE_VIDEO)
- mov_write_video_tag(pb, mov, track);
+ ret = mov_write_video_tag(pb, mov, track);
else if (track->par->codec_type == AVMEDIA_TYPE_AUDIO)
- mov_write_audio_tag(s, pb, mov, track);
+ ret = mov_write_audio_tag(s, pb, mov, track);
else if (track->par->codec_type == AVMEDIA_TYPE_SUBTITLE)
- mov_write_subtitle_tag(pb, track);
+ ret = mov_write_subtitle_tag(pb, track);
else if (track->par->codec_tag == MKTAG('r','t','p',' '))
- mov_write_rtp_tag(pb, track);
+ ret = mov_write_rtp_tag(pb, track);
else if (track->par->codec_tag == MKTAG('t','m','c','d'))
- mov_write_tmcd_tag(pb, track);
+ ret = mov_write_tmcd_tag(pb, track);
else if (track->par->codec_tag == MKTAG('g','p','m','d'))
- mov_write_gpmd_tag(pb, track);
+ ret = mov_write_gpmd_tag(pb, track);
+
+ if (ret < 0)
+ return ret;
+
return update_size(pb, pos);
}
@@ -2435,11 +2455,12 @@ static int mov_preroll_write_stbl_atoms(AVIOContext *pb, MOVTrack *track)
static int mov_write_stbl_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext *mov, MOVTrack *track)
{
int64_t pos = avio_tell(pb);
- int ret;
+ int ret = 0;
avio_wb32(pb, 0); /* size */
ffio_wfourcc(pb, "stbl");
- mov_write_stsd_tag(s, pb, mov, track);
+ if ((ret = mov_write_stsd_tag(s, pb, mov, track)) < 0)
+ return ret;
mov_write_stts_tag(pb, track);
if ((track->par->codec_type == AVMEDIA_TYPE_VIDEO ||
track->par->codec_tag == MKTAG('r','t','p',' ')) &&
--
2.20.1.611.gfbb209baf1-goog
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