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#include "encoder.h"
#include <assert.h>
int encoder_init (struct Encoder *encoder, const AVCodecParameters *codecpar, AVDictionary **opts)
{
/* NOTE: While encoder->time_base "MUST be set by user" when encoding
* (quoted from the official FFMPEG documentation), avcodec_open2 actually
* discard it's value and set it to '1/sample_rate'.
*
* NOTE: The assert at the end of this section serves to protect cybd in
* case the FFMPEG devs update their code to implement some funny behaviors.
*/
int err;
AVCodecContext *avctx;
const AVCodec *codec;
if ((codec = avcodec_find_encoder(codecpar->codec_id)) == NULL) {
err = AVERROR_ENCODER_NOT_FOUND;
goto error;
}
if ((avctx = avcodec_alloc_context3(codec)) == NULL)
return AVERROR(ENOMEM);
if ((err = avcodec_parameters_to_context(avctx, codecpar)) < 0)
goto error;
if ((err = avcodec_open2(avctx, codec, opts)))
goto error;
/* Because some code rely on avctx's time base to be 1/sample_rate, and
* because this behavious currently appears undocumented, I placed some
* assert here to catch up if anything changes up with ffmpeg. */
assert(avctx->time_base.num == 1);
assert(avctx->time_base.den == avctx->sample_rate);
encoder->avctx = avctx;
encoder->pts = 0;
return 0;
error:
avcodec_free_context(&avctx);
return err;
}
int encoder_init_for_stream (struct Encoder *encoder, const AVStream *stream, AVDictionary **opts)
{
return encoder_init(encoder, stream->codecpar, opts);
}
int encoder_send (struct Encoder *encoder, const AVFrame *frame)
{
return avcodec_send_frame(encoder->avctx, frame);
}
int encoder_convert (struct Encoder *encoder, AVPacket *pkt_out)
{
int err;
err = avcodec_receive_packet(encoder->avctx, pkt_out);
if (err < 0) return err;
// Manually setting pts because FFMPEG doesn't do it consistantly
//pkt_out->pts = encoder->pts;
//encoder->pts += pkt_out->duration;
return 0;
}
void encoder_free (struct Encoder *encoder)
{
avcodec_free_context(&encoder->avctx);
}
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