在linux上通过ffmpeg+faac库把pcm格式音频转换成aac格式音频

#include "stdio.h" #include "stdlib.h" #include "libavformat/avformat.h" #include "libavcodec/avcodec.h" #include "libavutil/avutil.h" int main(int argc, char **argv) { if(argc < 3) { printf("argc number is error\n"); return 0; } av_register_all(); AVCodecContext *encodecCtx = NULL; AVCodec *encodec; AVPacket enpacket; AVFrame *avframe; int gotframeptr; int frame_size = 0; int *samples = 0; int SAMPLESIZE = 0; encodec = avcodec_find_encoder(CODEC_ID_AAC); if(!encodec) { fprintf(stderr, "Unsupported encodec!\n"); return -1; } encodecCtx= avcodec_alloc_context3(encodec); encodecCtx->channels = 2; encodecCtx->sample_fmt = AV_SAMPLE_FMT_S16; encodecCtx->sample_rate = 44100; encodecCtx->bit_rate = 128000; encodecCtx->profile = FF_PROFILE_AAC_LOW; encodecCtx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; if((avcodec_open2(encodecCtx, encodec, NULL) < 0)) { fprintf(stderr, "can't open encodec!\n"); return -1; } FILE *fin = NULL; fin = fopen(argv[1],"rb"); if(!fin) { printf("open fin file error\n"); return 0; } FILE *fout = NULL; fout = fopen(argv[2],"a+"); if(!fout) { printf("open fout file error\n"); return 0; } avframe = avcodec_alloc_frame(); if (!avframe) { fprintf(stderr, "Could not allocate audio frame\n"); exit(1); } avframe->nb_samples = encodecCtx->frame_size; avframe->format = encodecCtx->sample_fmt; avframe->channel_layout = encodecCtx->channel_layout; int buffer_size = av_samples_get_buffer_size(NULL, encodecCtx->channels, encodecCtx->frame_size, encodecCtx->sample_fmt, 0); printf("--%d---%d\n",encodecCtx->frame_size,buffer_size); samples = av_malloc(buffer_size); if (!samples) { fprintf(stderr, "Could not allocate %d bytes for samples buffer\n", buffer_size); exit(1); } /* setup the data pointers in the AVFrame */ int ret = avcodec_fill_audio_frame(avframe, encodecCtx->channels, encodecCtx->sample_fmt, (const uint8_t*)samples, buffer_size, 0); if (ret < 0) { fprintf(stderr, "Could not setup audio frame\n"); exit(1); } //memset(out_buf,0,encodecCtx->frame_size*8); int size; int len; int got_output; av_init_packet(&enpacket); enpacket.data = NULL; enpacket.size = 0; while(1) { size = fread(samples,1,buffer_size,fin); if(size == 0) { printf("read elf\n"); break; } len = avcodec_encode_audio2(encodecCtx,&enpacket,avframe,&got_output); printf("1111---%d__1111__%d1111__%d\n",size,len,enpacket.size); if(got_output) { int num = fwrite(enpacket.data,1,enpacket.size,fout); if(num == 0) { printf("write error\n"); sleep(1); } av_free_packet(&enpacket); av_init_packet(&enpacket); enpacket.data = NULL; enpacket.size = 0; printf("222222222222222222222222\n"); } //memset(out_buf,0,FF_MIN_BUFFER_SIZE); } av_free_packet(&enpacket); free(samples); fclose(fout); fclose(fin); return 0; }