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#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "avcodec.h"
#include "ac3.h"
typedef struct CombineContext{
AVClass *av_class; ///< AVClass used for AVOption
AC3EncOptions options; ///< encoding options
void *ctx;
AVCodec *codec;
}CombineContext;
static AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
ff_ac3_options, LIBAVUTIL_VERSION_INT };
static av_cold AVCodec *get_codec(enum AVSampleFormat s){
#if CONFIG_AC3_FIXED_ENCODER
if(s==AV_SAMPLE_FMT_S16) return &ff_ac3_fixed_encoder;
#endif
#if CONFIG_AC3_FLOAT_ENCODER
if(s==AV_SAMPLE_FMT_FLT) return &ff_ac3_float_encoder;
#endif
return NULL;
}
static av_cold int encode_init(AVCodecContext *avctx)
{
CombineContext *c= avctx->priv_data;
int ret;
int offset= (uint8_t*)&c->options - (uint8_t*)c;
c->codec= get_codec(avctx->sample_fmt);
if(!c->codec){
av_log(avctx, AV_LOG_ERROR, "Unsupported sample format\n");
return -1;
}
c->ctx= av_mallocz(c->codec->priv_data_size);
memcpy((uint8_t*)c->ctx + offset, &c->options, (uint8_t*)&c->ctx - (uint8_t*)&c->options);
FFSWAP(void *,avctx->priv_data, c->ctx);
ret= c->codec->init(avctx);
FFSWAP(void *,avctx->priv_data, c->ctx);
return ret;
}
static int encode_frame(AVCodecContext *avctx, unsigned char *frame,
int buf_size, void *data)
{
CombineContext *c= avctx->priv_data;
int ret;
FFSWAP(void *,avctx->priv_data, c->ctx);
ret= c->codec->encode(avctx, frame, buf_size, data);
FFSWAP(void *,avctx->priv_data, c->ctx);
return ret;
}
static av_cold int encode_close(AVCodecContext *avctx)
{
CombineContext *c= avctx->priv_data;
int ret;
FFSWAP(void *,avctx->priv_data, c->ctx);
ret= c->codec->close(avctx);
FFSWAP(void *,avctx->priv_data, c->ctx);
return ret;
}
AVCodec ff_ac3_encoder = {
"ac3",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_AC3,
sizeof(CombineContext),
encode_init,
encode_frame,
encode_close,
NULL,
.sample_fmts = (const enum AVSampleFormat[]){
#if CONFIG_AC3_FLOAT_ENCODER
AV_SAMPLE_FMT_FLT,
#endif
#if CONFIG_AC3_FIXED_ENCODER
AV_SAMPLE_FMT_S16,
#endif
AV_SAMPLE_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
.priv_class = &ac3enc_class,
.channel_layouts = ff_ac3_channel_layouts,
};
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