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avformat/options: Only allocate AVCodecContext for demuxers

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The muxer's AVCodecContext is currently used for exactly one thing:
To store a time base in it that has been derived via heuristics
in avformat_transfer_internal_stream_timing_info(); said time base
can then be read back via av_stream_get_codec_timebase().
But one does not need a whole AVCodecContext for that, a simple
AVRational is enough.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2024-02-03 02:57:52 +01:00
parent 76ef2b9337
commit 569ad285a5
4 changed files with 47 additions and 36 deletions
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59
libavformat/avformat.c
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@ -729,8 +729,6 @@ AVRational av_guess_frame_rate(AVFormatContext *format, AVStream *st, AVFrame *f
{
AVRational fr = st->r_frame_rate;
const AVCodecDescriptor *desc = cffstream(st)->codec_desc;
AVCodecContext *const avctx = ffstream(st)->avctx;
AVRational codec_fr = avctx->framerate;
AVRational avg_fr = st->avg_frame_rate;
if (avg_fr.num > 0 && avg_fr.den > 0 && fr.num > 0 && fr.den > 0 &&
@ -739,6 +737,9 @@ AVRational av_guess_frame_rate(AVFormatContext *format, AVStream *st, AVFrame *f
}
if (desc && (desc->props & AV_CODEC_PROP_FIELDS)) {
const AVCodecContext *const avctx = ffstream(st)->avctx;
AVRational codec_fr = avctx->framerate;
if ( codec_fr.num > 0 && codec_fr.den > 0 &&
(fr.num == 0 || av_q2d(codec_fr) < av_q2d(fr)*0.7 && fabs(1.0 - av_q2d(av_div_q(avg_fr, fr))) > 0.1))
fr = codec_fr;
@ -753,13 +754,19 @@ int avformat_transfer_internal_stream_timing_info(const AVOutputFormat *ofmt,
{
const AVCodecDescriptor *desc = cffstream(ist)->codec_desc;
const AVCodecContext *const dec_ctx = cffstream(ist)->avctx;
AVCodecContext *const enc_ctx = ffstream(ost)->avctx;
AVRational mul = (AVRational){ desc && (desc->props & AV_CODEC_PROP_FIELDS) ? 2 : 1, 1 };
AVRational dec_ctx_tb = dec_ctx->framerate.num ? av_inv_q(av_mul_q(dec_ctx->framerate, mul))
AVRational dec_ctx_framerate = dec_ctx ? dec_ctx->framerate : (AVRational){ 0, 0 };
AVRational dec_ctx_tb = dec_ctx_framerate.num ? av_inv_q(av_mul_q(dec_ctx_framerate, mul))
: (ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO ? (AVRational){0, 1}
: ist->time_base);
enc_ctx->time_base = ist->time_base;
AVRational enc_tb = ist->time_base;
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
int ticks_per_frame = dec_ctx ? dec_ctx->ticks_per_frame : 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
/*
* Avi is a special case here because it supports variable fps but
* having the fps and timebase differe significantly adds quite some
@ -773,35 +780,31 @@ int avformat_transfer_internal_stream_timing_info(const AVOutputFormat *ofmt,
&& 0.5/av_q2d(ist->r_frame_rate) > av_q2d(dec_ctx_tb)
&& av_q2d(ist->time_base) < 1.0/500 && av_q2d(dec_ctx_tb) < 1.0/500
|| copy_tb == AVFMT_TBCF_R_FRAMERATE) {
enc_ctx->time_base.num = ist->r_frame_rate.den;
enc_ctx->time_base.den = 2*ist->r_frame_rate.num;
enc_tb.num = ist->r_frame_rate.den;
enc_tb.den = 2*ist->r_frame_rate.num;
} else
#endif
if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx->framerate.num &&
av_q2d(av_inv_q(dec_ctx->framerate)) > 2*av_q2d(ist->time_base)
if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx_framerate.num &&
av_q2d(av_inv_q(dec_ctx_framerate)) > 2*av_q2d(ist->time_base)
&& av_q2d(ist->time_base) < 1.0/500
|| (copy_tb == AVFMT_TBCF_DECODER &&
(dec_ctx->framerate.num || ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO))) {
enc_ctx->time_base = dec_ctx_tb;
enc_ctx->time_base.den *= 2;
(dec_ctx_framerate.num || ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO))) {
enc_tb = dec_ctx_tb;
enc_tb.den *= 2;
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
enc_ctx->time_base.num *= dec_ctx->ticks_per_frame;
FF_ENABLE_DEPRECATION_WARNINGS
enc_tb.num *= ticks_per_frame;
#endif
}
} else if (!(ofmt->flags & AVFMT_VARIABLE_FPS)
&& !av_match_name(ofmt->name, "mov,mp4,3gp,3g2,psp,ipod,ismv,f4v")) {
if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx->framerate.num
&& av_q2d(av_inv_q(dec_ctx->framerate)) > av_q2d(ist->time_base)
if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx_framerate.num
&& av_q2d(av_inv_q(dec_ctx_framerate)) > av_q2d(ist->time_base)
&& av_q2d(ist->time_base) < 1.0/500
|| (copy_tb == AVFMT_TBCF_DECODER &&
(dec_ctx->framerate.num || ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO))) {
enc_ctx->time_base = dec_ctx_tb;
(dec_ctx_framerate.num || ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO))) {
enc_tb = dec_ctx_tb;
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
enc_ctx->time_base.num *= dec_ctx->ticks_per_frame;
FF_ENABLE_DEPRECATION_WARNINGS
enc_tb.num *= ticks_per_frame;
#endif
}
}
@ -810,18 +813,19 @@ FF_ENABLE_DEPRECATION_WARNINGS
&& dec_ctx_tb.num < dec_ctx_tb.den
&& dec_ctx_tb.num > 0
&& 121LL*dec_ctx_tb.num > dec_ctx_tb.den) {
enc_ctx->time_base = dec_ctx_tb;
enc_tb = dec_ctx_tb;
}
av_reduce(&enc_ctx->time_base.num, &enc_ctx->time_base.den,
enc_ctx->time_base.num, enc_ctx->time_base.den, INT_MAX);
av_reduce(&ffstream(ost)->transferred_mux_tb.num,
&ffstream(ost)->transferred_mux_tb.den,
enc_tb.num, enc_tb.den, INT_MAX);
return 0;
}
AVRational av_stream_get_codec_timebase(const AVStream *st)
{
return cffstream(st)->avctx->time_base;
return cffstream(st)->avctx ? cffstream(st)->avctx->time_base : cffstream(st)->transferred_mux_tb;
}
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits,
@ -846,7 +850,8 @@ void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits,
return;
}
st->time_base = new_tb;
sti->avctx->pkt_timebase = new_tb;
if (sti->avctx)
sti->avctx->pkt_timebase = new_tb;
st->pts_wrap_bits = pts_wrap_bits;
}