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#include "decoder.h"
#include <libavutil/dict.h>
int decoder_init (struct Decoder *decoder, const AVCodecParameters *codecpar, AVDictionary **opts)
{
int err;
AVCodecContext *avctx;
const AVCodec *codec;
if ((codec = avcodec_find_decoder(codecpar->codec_id)) == NULL)
return AVERROR_DECODER_NOT_FOUND;
/* NOTE: parameter 'codec' might be redundant here due to the next, more
* featuref-full call to avcodec_parameters_to_context. */
if ((avctx = avcodec_alloc_context3(codec)) == NULL)
return AVERROR(ENOMEM); /* NOTE: After reading libavcodec's code, this
* error code *could* misrepresent the actual
* error, but ffmpeg won't tell us what it is
* anyway so oh well. */
if ((err = avcodec_parameters_to_context(avctx, codecpar)) < 0)
goto error;
if ((err = avcodec_open2(avctx, codec, opts)) < 0)
goto error;
/* Free previous context (no-op if avctx == NULL) and swap it with the new
* one. This allows the previous one to be left untouched in case of error,
* which is generally a nice thing to do in your code. */
avcodec_free_context(&decoder->avctx);
decoder->avctx = avctx;
return 0;
error:
avcodec_free_context(&avctx);
return err;
}
int decoder_init_for_stream (struct Decoder *decoder, const AVStream *stream, AVDictionary **opts)
{
return decoder_init(decoder, stream->codecpar, opts);
}
int decoder_send (struct Decoder *decoder, const AVPacket *pkt)
{
return avcodec_send_packet(decoder->avctx, pkt);
}
int decoder_convert (struct Decoder *decoder, AVFrame *out)
{
return avcodec_receive_frame(decoder->avctx, out);
}
void decoder_free (struct Decoder *decoder)
{
if (decoder == NULL) return;
avcodec_free_context(&decoder->avctx);
}
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