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