#include?

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#define?BUF_SIZE_20K?2048000
#define?BUF_SIZE_1K?1024000

static?AVFormatContext?*ifmt_ctx;
static?AVFormatContext?*ofmt_ctx;
static?SwrContext*?pSwrCtx?=?NULL;
AVBitStreamFilterContext*?aacbsfc?=?NULL;

void?initSwr（int?audio_index）??
{??
????if?（ofmt_ctx->streams[0]->codec->channels?!=?ifmt_ctx->streams[audio_index]->codec->channels??
????????||?ofmt_ctx->streams[0]->codec->sample_rate?!=?ifmt_ctx->streams[audio_index]->codec->sample_rate??
????????||?ofmt_ctx->streams[0]->codec->sample_fmt?!=?ifmt_ctx->streams[audio_index]->codec->sample_fmt）??
????{??
????????if?（?NULL?==?pSwrCtx?）???
????????{??
????????????pSwrCtx?=?swr_alloc（）;??
????????}??
//?#if?LIBSWRESAMPLE_VERSION_MINOR?>=?17????//?根據版本不同，選用適當函數??
????????//?av_opt_set_int（pSwrCtx?“ich“?ifmt_ctx->streams[audio_index]->codec->channels?0）;??
????????//?av_opt_set_int（pSwrCtx?“och“?ofmt_ctx->streams[audio_index]->codec->channels?0）;??
????????//?av_opt_set_int（pSwrCtx?“in_sample_rate“??ifmt_ctx->streams[audio_index]->codec->sample_rate?0）;??
????????//?av_opt_set_int（pSwrCtx?“out_sample_rate“??ofmt_ctx->streams[audio_index]->codec->sample_rate?0）;??
????????//?av_opt_set_sample_fmt（pSwrCtx?“in_sample_fmt“?ifmt_ctx->streams[audio_index]->codec->sample_fmt?0）;??
????????//?av_opt_set_sample_fmt（pSwrCtx?“out_sample_fmt“?ofmt_ctx->streams[audio_index]->codec->sample_fmt?0）;??
??
//?#else??
????????pSwrCtx?=?swr_alloc_set_opts（NULL?????????????
????????????ofmt_ctx->streams[audio_index]->codec->channel_layout???
????????????ofmt_ctx->streams[audio_index]->codec->sample_fmt???
????????????ofmt_ctx->streams[audio_index]->codec->sample_rate??
????????????ifmt_ctx->streams[audio_index]->codec->channel_layout???
????????????ifmt_ctx->streams[audio_index]->codec->sample_fmt???
????????????ifmt_ctx->streams[audio_index]->codec->sample_rate??
????????????0?NULL）;??
//?#endif??
????????swr_init（pSwrCtx）;??
????}??
}??
??
//setup_array函數摘自ffmpeg例程??
static?void?setup_array（uint8_t*?out[32]?AVframe*?in_frame?int?format?int?samples）??
{??
????if?（av_sample_fmt_is_planar（format））???
????{??
????????int?i;
????????int?plane_size?=?av_get_bytes_per_sample（（format?&?0xFF））?*?samples;
????????format?&=?0xFF;??
??????????
????????//從decoder出來的frame中的data數據不是連續分布的，所以不能這樣寫：??
????????in_frame->data[0]+i*plane_size;??
????????for?（i?=?0;?i?ame->channels;?i++）??
????????{??
????????????out[i]?=?in_frame->data[i];??
????????}??
????}???
????else??
????{??
????????out[0]?=?in_frame->data[0];??
????}??
}

int?TransSample（AVframe?*in_frame?AVframe?*out_frame?int?audio_index）??
{??
????int?ret;??
????int?max_dst_nb_samples?=?4096;??
???