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ffmpeg: simplify mid-stream reconfiguration when libavfilter is disabled

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Implement lazy initialization of the image resample context, so that
the initialization code does not need to be duplicated.

Also manage the case in which resample/size change mid-stream. For
each packet the code computes if resampling is needed.

Previously the resample check was done only at the initialization, in
case size/format changed and no resample was detected at the init
stage ffmpeg was silently exiting.
This commit is contained in:
Stefano Sabatini
2011-05-02 09:35:38 +02:00
parent 566666caf3
commit f5a669c229
1 changed files with 17 additions and 24 deletions
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41
ffmpeg.c
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@@ -1204,14 +1204,28 @@ static void do_video_out(AVFormatContext *s,
ist->file_index, ist->index,
ost->resample_width, ost->resample_height, avcodec_get_pix_fmt_name(ost->resample_pix_fmt),
dec->width , dec->height , avcodec_get_pix_fmt_name(dec->pix_fmt));
if(!ost->video_resample)
ffmpeg_exit(1);
ost->resample_width = dec->width;
ost->resample_height = dec->height;
ost->resample_pix_fmt = dec->pix_fmt;
}
#if !CONFIG_AVFILTER
ost->video_resample = dec->width != enc->width ||
dec->height != enc->height ||
dec->pix_fmt != enc->pix_fmt;
if (ost->video_resample) {
final_picture = &ost->pict_tmp;
if (resample_changed) {
if (!ost->img_resample_ctx || resample_changed) {
/* initialize the destination picture */
if (!ost->pict_tmp.data[0]) {
avcodec_get_frame_defaults(&ost->pict_tmp);
if (avpicture_alloc((AVPicture *)&ost->pict_tmp, enc->pix_fmt,
enc->width, enc->height)) {
fprintf(stderr, "Cannot allocate temp picture, check pix fmt\n");
ffmpeg_exit(1);
}
}
/* initialize a new scaler context */
sws_freeContext(ost->img_resample_ctx);
sws_flags = av_get_int(sws_opts, "sws_flags", NULL);
@@ -2290,27 +2304,6 @@ static int transcode(AVFormatContext **output_files,
codec->height != icodec->height ||
codec->pix_fmt != icodec->pix_fmt;
if (ost->video_resample) {
#if !CONFIG_AVFILTER
avcodec_get_frame_defaults(&ost->pict_tmp);
if(avpicture_alloc((AVPicture*)&ost->pict_tmp, codec->pix_fmt,
codec->width, codec->height)) {
fprintf(stderr, "Cannot allocate temp picture, check pix fmt\n");
ffmpeg_exit(1);
}
sws_flags = av_get_int(sws_opts, "sws_flags", NULL);
ost->img_resample_ctx = sws_getContext(
icodec->width,
icodec->height,
icodec->pix_fmt,
codec->width,
codec->height,
codec->pix_fmt,
sws_flags, NULL, NULL, NULL);
if (ost->img_resample_ctx == NULL) {
fprintf(stderr, "Cannot get resampling context\n");
ffmpeg_exit(1);
}
#endif
codec->bits_per_raw_sample= frame_bits_per_raw_sample;
}
ost->resample_height = icodec->height;