AVRational Codec::GetSupportedFrameRate(const AVRational& frame_rate) const
{
AVRational fps(frame_rate);
while (get()->id == CODEC_ID_MPEG4 && fps.num > (1<<16)-1)
{
fps.num /= 2;
fps.den /= 2;
}
if (!get()->supported_framerates) return fps;
return get()->supported_framerates[av_find_nearest_q_idx(fps, get()->supported_framerates)];
}
const MXFSamplesPerFrame *ff_mxf_get_samples_per_frame(AVFormatContext *s,
AVRational time_base)
{
int idx = av_find_nearest_q_idx(time_base, mxf_time_base);
AVRational diff = av_sub_q(time_base, mxf_time_base[idx]);
diff.num = abs(diff.num);
if (av_cmp_q(diff, (AVRational){1, 1000}) >= 0)
return NULL;
if (av_cmp_q(time_base, mxf_time_base[idx]))
av_log(s, AV_LOG_WARNING,
"%d/%d input time base matched %d/%d container time base\n",
time_base.num, time_base.den,
mxf_spf[idx].time_base.num,
mxf_spf[idx].time_base.den);
return &mxf_spf[idx];
}
int encode_lavc_alloc_stream(struct encode_lavc_context *ctx,
enum AVMediaType mt,
AVStream **stream_out,
AVCodecContext **codec_out)
{
AVDictionaryEntry *de;
char **p;
*stream_out = NULL;
*codec_out = NULL;
CHECK_FAIL(ctx, -1);
if (ctx->header_written)
return -1;
if (ctx->avc->nb_streams == 0) {
// if this stream isn't stream #0, allocate a dummy stream first for
// the next call to use
if (mt == AVMEDIA_TYPE_VIDEO && ctx->audio_first) {
MP_INFO(ctx, "vo-lavc: preallocated audio stream for later use\n");
ctx->ast = avformat_new_stream(
ctx->avc, NULL); // this one is AVMEDIA_TYPE_UNKNOWN for now
}
if (mt == AVMEDIA_TYPE_AUDIO && ctx->video_first) {
MP_INFO(ctx, "ao-lavc: preallocated video stream for later use\n");
ctx->vst = avformat_new_stream(
ctx->avc, NULL); // this one is AVMEDIA_TYPE_UNKNOWN for now
}
}
// already have a stream of that type (this cannot really happen)?
switch (mt) {
case AVMEDIA_TYPE_VIDEO:
if (ctx->vcc != NULL)
return -1;
if (ctx->vst == NULL)
ctx->vst = avformat_new_stream(ctx->avc, NULL);
break;
case AVMEDIA_TYPE_AUDIO:
if (ctx->acc != NULL)
return -1;
if (ctx->ast == NULL)
ctx->ast = avformat_new_stream(ctx->avc, NULL);
break;
default:
encode_lavc_fail(ctx, "requested invalid stream type\n");
return -1;
}
if (ctx->timebase.den == 0) {
AVRational r;
if (ctx->options->fps > 0)
r = av_d2q(ctx->options->fps, ctx->options->fps * 1001 + 2);
else if (ctx->options->autofps && ctx->vo_fps > 0) {
r = av_d2q(ctx->vo_fps, ctx->vo_fps * 1001 + 2);
MP_INFO(ctx, "option --ofps not specified "
"but --oautofps is active, using guess of %u/%u\n",
(unsigned)r.num, (unsigned)r.den);
} else {
// we want to handle:
// 1/25
// 1001/24000
// 1001/30000
// for this we would need 120000fps...
// however, mpeg-4 only allows 16bit values
// so let's take 1001/30000 out
r.num = 24000;
r.den = 1;
MP_INFO(ctx, "option --ofps not specified "
"and fps could not be inferred, using guess of %u/%u\n",
(unsigned)r.num, (unsigned)r.den);
}
if (ctx->vc && ctx->vc->supported_framerates)
r = ctx->vc->supported_framerates[av_find_nearest_q_idx(r,
ctx->vc->supported_framerates)];
ctx->timebase.num = r.den;
ctx->timebase.den = r.num;
}
switch (mt) {
case AVMEDIA_TYPE_VIDEO:
if (!ctx->vc) {
if (ctx->avc->oformat->video_codec != AV_CODEC_ID_NONE ||
ctx->options->vcodec) {
encode_lavc_fail(ctx, "vo-lavc: encoder not found\n");
}
return -1;
}
ctx->vcc = avcodec_alloc_context3(ctx->vc);
// Using codec->time_base is deprecated, but needed for older lavf.
ctx->vst->time_base = ctx->timebase;
ctx->vcc->time_base = ctx->timebase;
ctx->voptions = NULL;
if (ctx->options->vopts)
for (p = ctx->options->vopts; *p; ++p)
if (!set_to_avdictionary(ctx, &ctx->voptions, NULL, *p))
MP_WARN(ctx, "vo-lavc: could not set option %s\n", *p);
de = av_dict_get(ctx->voptions, "global_quality", NULL, 0);
if (de)
set_to_avdictionary(ctx, &ctx->voptions, "flags", "+qscale");
if (ctx->avc->oformat->flags & AVFMT_GLOBALHEADER)
set_to_avdictionary(ctx, &ctx->voptions, "flags", "+global_header");
encode_2pass_prepare(ctx, &ctx->voptions, ctx->vst, ctx->vcc,
&ctx->twopass_bytebuffer_v,
"vo-lavc");
*stream_out = ctx->vst;
*codec_out = ctx->vcc;
return 0;
case AVMEDIA_TYPE_AUDIO:
if (!ctx->ac) {
if (ctx->avc->oformat->audio_codec != AV_CODEC_ID_NONE ||
ctx->options->acodec) {
encode_lavc_fail(ctx, "ao-lavc: encoder not found\n");
}
return -1;
}
ctx->acc = avcodec_alloc_context3(ctx->ac);
// Using codec->time_base is deprecated, but needed for older lavf.
ctx->ast->time_base = ctx->timebase;
ctx->acc->time_base = ctx->timebase;
ctx->aoptions = 0;
if (ctx->options->aopts)
for (p = ctx->options->aopts; *p; ++p)
if (!set_to_avdictionary(ctx, &ctx->aoptions, NULL, *p))
MP_WARN(ctx, "ao-lavc: could not set option %s\n", *p);
de = av_dict_get(ctx->aoptions, "global_quality", NULL, 0);
if (de)
set_to_avdictionary(ctx, &ctx->aoptions, "flags", "+qscale");
if (ctx->avc->oformat->flags & AVFMT_GLOBALHEADER)
set_to_avdictionary(ctx, &ctx->aoptions, "flags", "+global_header");
encode_2pass_prepare(ctx, &ctx->aoptions, ctx->ast, ctx->acc,
&ctx->twopass_bytebuffer_a,
"ao-lavc");
*stream_out = ctx->ast;
*codec_out = ctx->acc;
return 0;
}
// Unreachable.
return -1;
}
