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videoconvert-ffmpeg: support transcoding

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When the input and output is an encoded format but the dimensions are
different, do a decode, scale and encode.
This commit is contained in:
Wim Taymans 2025-03-26 17:50:54 +01:00
parent f8dcf32c8d
commit 479ba33685
1 changed files with 29 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

53
spa/plugins/videoconvert/videoconvert-ffmpeg.c
View file

@ -863,6 +863,7 @@ static int setup_convert(struct impl *this)
{
struct dir *in, *out;
uint32_t format;
int decoder_id = 0, encoder_id = 0;
in = &this->dir[SPA_DIRECTION_INPUT];
out = &this->dir[SPA_DIRECTION_OUTPUT];
@ -876,6 +877,9 @@ static int setup_convert(struct impl *this)
if (!in->have_format || !out->have_format)
return -EIO;
get_format(in, &in->width, &in->height, &format);
get_format(out, &out->width, &out->height, &format);
switch (in->format.media_subtype) {
case SPA_MEDIA_SUBTYPE_raw:
in->pix_fmt = format_to_pix_fmt(in->format.info.raw.format);
@ -884,20 +888,14 @@ static int setup_convert(struct impl *this)
out->pix_fmt = format_to_pix_fmt(out->format.info.raw.format);
break;
case SPA_MEDIA_SUBTYPE_mjpg:
if ((this->encoder.codec = avcodec_find_encoder(AV_CODEC_ID_MJPEG)) == NULL) {
spa_log_error(this->log, "failed to find MJPEG encoder");
return -ENOTSUP;
}
encoder_id = AV_CODEC_ID_MJPEG;
out->format.media_subtype = SPA_MEDIA_SUBTYPE_raw;
out->format.info.raw.format = SPA_VIDEO_FORMAT_I420;
out->format.info.raw.size = in->format.info.raw.size;
out->pix_fmt = AV_PIX_FMT_YUVJ420P;
break;
case SPA_MEDIA_SUBTYPE_h264:
if ((this->encoder.codec = avcodec_find_encoder(AV_CODEC_ID_H264)) == NULL) {
spa_log_error(this->log, "failed to find H264 encoder");
return -ENOTSUP;
}
encoder_id = AV_CODEC_ID_H264;
break;
default:
return -ENOTSUP;
@ -906,14 +904,16 @@ static int setup_convert(struct impl *this)
case SPA_MEDIA_SUBTYPE_mjpg:
switch (out->format.media_subtype) {
case SPA_MEDIA_SUBTYPE_mjpg:
/* passthrough */
/* passthrough if same dimensions or else reencode */
if (in->width != out->width ||
in->height != out->height) {
encoder_id = decoder_id = AV_CODEC_ID_MJPEG;
out->pix_fmt = AV_PIX_FMT_YUVJ420P;
}
break;
case SPA_MEDIA_SUBTYPE_raw:
out->pix_fmt = format_to_pix_fmt(out->format.info.raw.format);
if ((this->decoder.codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG)) == NULL) {
spa_log_error(this->log, "failed to find MJPEG decoder");
return -ENOTSUP;
}
decoder_id = AV_CODEC_ID_MJPEG;
break;
default:
return -ENOTSUP;
@ -922,14 +922,14 @@ static int setup_convert(struct impl *this)
case SPA_MEDIA_SUBTYPE_h264:
switch (out->format.media_subtype) {
case SPA_MEDIA_SUBTYPE_h264:
/* passthrough */
/* passthrough if same dimensions or else reencode */
if (in->width != out->width ||
in->height != out->height)
encoder_id = decoder_id = AV_CODEC_ID_H264;
break;
case SPA_MEDIA_SUBTYPE_raw:
out->pix_fmt = format_to_pix_fmt(out->format.info.raw.format);
if ((this->decoder.codec = avcodec_find_decoder(AV_CODEC_ID_H264)) == NULL) {
spa_log_error(this->log, "failed to find H264 decoder");
return -ENOTSUP;
}
decoder_id = AV_CODEC_ID_H264;
break;
default:
return -ENOTSUP;
@ -939,10 +939,11 @@ static int setup_convert(struct impl *this)
return -ENOTSUP;
}
get_format(in, &in->width, &in->height, &format);
get_format(out, &out->width, &out->height, &format);
if (this->decoder.codec) {
if (decoder_id) {
if ((this->decoder.codec = avcodec_find_decoder(decoder_id)) == NULL) {
spa_log_error(this->log, "failed to find %d decoder", decoder_id);
return -ENOTSUP;
}
if ((this->decoder.context = avcodec_alloc_context3(this->decoder.codec)) == NULL)
return -EIO;
@ -958,7 +959,12 @@ static int setup_convert(struct impl *this)
}
if ((this->decoder.frame = av_frame_alloc()) == NULL)
return -EIO;
if (this->encoder.codec) {
if (encoder_id) {
if ((this->encoder.codec = avcodec_find_encoder(encoder_id)) == NULL) {
spa_log_error(this->log, "failed to find %d encoder", encoder_id);
return -ENOTSUP;
}
if ((this->encoder.context = avcodec_alloc_context3(this->encoder.codec)) == NULL)
return -EIO;
@ -981,7 +987,6 @@ static int setup_convert(struct impl *this)
if ((this->convert.frame = av_frame_alloc()) == NULL)
return -EIO;
this->setup = true;
emit_node_info(this, false);