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fftools/ffmpeg_demux: set options on codec parameters rather than decoder

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This avoids the requirement to always have a decoder context.
This commit is contained in:
Anton Khirnov 2023-12-19 12:21:07 +01:00
parent 7e33534506
commit 2ee1c6ffb2
1 changed files with 21 additions and 22 deletions
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43
fftools/ffmpeg_demux.c
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@ -899,19 +899,18 @@ static int choose_decoder(const OptionsContext *o, AVFormatContext *s, AVStream
}
}
static int guess_input_channel_layout(InputStream *ist, int guess_layout_max)
static int guess_input_channel_layout(InputStream *ist, AVCodecParameters *par,
int guess_layout_max)
{
AVCodecContext *dec = ist->dec_ctx;
if (dec->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
if (par->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
char layout_name[256];
if (dec->ch_layout.nb_channels > guess_layout_max)
if (par->ch_layout.nb_channels > guess_layout_max)
return 0;
av_channel_layout_default(&dec->ch_layout, dec->ch_layout.nb_channels);
if (dec->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
av_channel_layout_default(&par->ch_layout, par->ch_layout.nb_channels);
if (par->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
return 0;
av_channel_layout_describe(&dec->ch_layout, layout_name, sizeof(layout_name));
av_channel_layout_describe(&par->ch_layout, layout_name, sizeof(layout_name));
av_log(ist, AV_LOG_WARNING, "Guessed Channel Layout: %s\n", layout_name);
}
return 1;
@ -1145,16 +1144,6 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
ist->user_set_discard = ist->st->discard;
}
ist->dec_ctx = avcodec_alloc_context3(ist->dec);
if (!ist->dec_ctx)
return AVERROR(ENOMEM);
ret = avcodec_parameters_to_context(ist->dec_ctx, par);
if (ret < 0) {
av_log(ist, AV_LOG_ERROR, "Error initializing the decoder context.\n");
return ret;
}
if (o->bitexact)
av_dict_set(&ist->decoder_opts, "flags", "+bitexact", AV_DICT_MULTIKEY);
@ -1181,7 +1170,7 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
case AVMEDIA_TYPE_AUDIO: {
int guess_layout_max = INT_MAX;
MATCH_PER_STREAM_OPT(guess_layout_max, i, guess_layout_max, ic, st);
guess_input_channel_layout(ist, guess_layout_max);
guess_input_channel_layout(ist, par, guess_layout_max);
break;
}
case AVMEDIA_TYPE_DATA:
@ -1190,7 +1179,7 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
MATCH_PER_STREAM_OPT(fix_sub_duration, i, ist->fix_sub_duration, ic, st);
MATCH_PER_STREAM_OPT(canvas_sizes, str, canvas_size, ic, st);
if (canvas_size) {
ret = av_parse_video_size(&ist->dec_ctx->width, &ist->dec_ctx->height,
ret = av_parse_video_size(&par->width, &par->height,
canvas_size);
if (ret < 0) {
av_log(ist, AV_LOG_FATAL, "Invalid canvas size: %s.\n", canvas_size);
@ -1201,8 +1190,8 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
/* Compute the size of the canvas for the subtitles stream.
If the subtitles codecpar has set a size, use it. Otherwise use the
maximum dimensions of the video streams in the same file. */
ist->sub2video.w = ist->dec_ctx->width;
ist->sub2video.h = ist->dec_ctx->height;
ist->sub2video.w = par->width;
ist->sub2video.h = par->height;
if (!(ist->sub2video.w && ist->sub2video.h)) {
for (int j = 0; j < ic->nb_streams; j++) {
AVCodecParameters *par1 = ic->streams[j]->codecpar;
@ -1226,6 +1215,16 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
default: av_assert0(0);
}
ist->dec_ctx = avcodec_alloc_context3(ist->dec);
if (!ist->dec_ctx)
return AVERROR(ENOMEM);
ret = avcodec_parameters_to_context(ist->dec_ctx, par);
if (ret < 0) {
av_log(ist, AV_LOG_ERROR, "Error initializing the decoder context.\n");
return ret;
}
ist->par = avcodec_parameters_alloc();
if (!ist->par)
return AVERROR(ENOMEM);