int main(int argc, char *argv[]) { FILE* in; char header[6]; int n; void *wav, *amr; if (argc < 3) { fprintf(stderr, "%s in.amr out.wav\n", argv[0]); return 1; } in = fopen(argv[1], "rb"); if (!in) { perror(argv[1]); return 1; } n = fread(header, 1, 6, in); if (n != 6 || memcmp(header, "#!AMR\n", 6)) { fprintf(stderr, "Bad header\n"); return 1; } wav = wav_write_open(argv[2], 8000, 16, 1); if (!wav) { fprintf(stderr, "Unable to open %s\n", argv[2]); return 1; } amr = Decoder_Interface_init(); while (1) { uint8_t buffer[500], littleendian[320], *ptr; int size, i; int16_t outbuffer[160]; /* Read the mode byte */ n = fread(buffer, 1, 1, in); if (n <= 0) break; /* Find the packet size */ size = sizes[(buffer[0] >> 3) & 0x0f]; n = fread(buffer + 1, 1, size, in); if (n != size) break; /* Decode the packet */ Decoder_Interface_Decode(amr, buffer, outbuffer, 0); /* Convert to little endian and write to wav */ ptr = littleendian; for (i = 0; i < 160; i++) { *ptr++ = (outbuffer[i] >> 0) & 0xff; *ptr++ = (outbuffer[i] >> 8) & 0xff; } wav_write_data(wav, littleendian, 320); } fclose(in); Decoder_Interface_exit(amr); wav_write_close(wav); return 0; }
int decode_amr(const char* infile, const char* outfile) { FILE* in = fopen(infile, "rb"); if (!in) { return 1; } char header[6]; ssize_t n = fread(header, 1, 6, in); if (n != 6 || memcmp(header, "#!AMR\n", 6)) { fprintf(stderr, "Bad header\n"); return 1; } void* wav = wav_write_open(outfile, 8000, 16, 1); void* amr = Decoder_Interface_init(); while (1) { uint8_t buffer[500]; /* Read the mode byte */ n = fread(buffer, 1, 1, in); if (n <= 0) break; /* Find the packet size */ int size = sizes[(buffer[0] >> 3) & 0x0f]; if (size <= 0) continue; n = fread(buffer + 1, 1, size, in); if (n != size) break; /* Decode the packet */ int16_t outbuffer[160]; Decoder_Interface_Decode(amr, buffer, outbuffer, 0); /* Convert to little endian and write to wav */ uint8_t littleendian[320]; uint8_t* ptr = littleendian; for (int i = 0; i < 160; i++) { *ptr++ = (outbuffer[i] >> 0) & 0xff; *ptr++ = (outbuffer[i] >> 8) & 0xff; } wav_write_data(wav, littleendian, 320); } fclose(in); Decoder_Interface_exit(amr); wav_write_close(wav); return 0; }
int main(int argc, char *argv[]) { const char *infile, *outfile; AVFormatContext *in = NULL; AVStream *st = NULL; void *wav = NULL; int output_size, ret, i; uint8_t *output_buf; int16_t *decode_buf; HANDLE_AACDECODER handle; AAC_DECODER_ERROR err; int frame_size = 0; if (argc < 3) { fprintf(stderr, "%s in.m4a out.wav\n", argv[0]); return 1; } infile = argv[1]; outfile = argv[2]; av_register_all(); avformat_network_init(); ret = avformat_open_input(&in, infile, NULL, NULL); if (ret < 0) { char buf[100]; av_strerror(ret, buf, sizeof(buf)); fprintf(stderr, "%s: %s\n", infile, buf); return 1; } for (i = 0; i < in->nb_streams && !st; i++) { if (in->streams[i]->codec->codec_id == AV_CODEC_ID_AAC) st = in->streams[i]; } if (!st) { fprintf(stderr, "No AAC stream found\n"); return 1; } if (!st->codec->extradata_size) { fprintf(stderr, "No AAC ASC found\n"); return 1; } handle = aacDecoder_Open(TT_MP4_RAW, 1); err = aacDecoder_ConfigRaw(handle, &st->codec->extradata, &st->codec->extradata_size); if (err != AAC_DEC_OK) { fprintf(stderr, "Unable to decode the ASC\n"); return 1; } output_size = 8*2*1024; output_buf = (uint8_t*) malloc(output_size); decode_buf = (int16_t*) malloc(output_size); while (1) { int i; UINT valid; AVPacket pkt = { 0 }; int ret = av_read_frame(in, &pkt); if (ret < 0) { if (ret == AVERROR(EAGAIN)) continue; break; } if (pkt.stream_index != st->index) { av_free_packet(&pkt); continue; } valid = pkt.size; err = aacDecoder_Fill(handle, &pkt.data, &pkt.size, &valid); if (err != AAC_DEC_OK) { fprintf(stderr, "Fill failed: %x\n", err); break; } err = aacDecoder_DecodeFrame(handle, decode_buf, output_size, 0); av_free_packet(&pkt); if (err == AAC_DEC_NOT_ENOUGH_BITS) continue; if (err != AAC_DEC_OK) { fprintf(stderr, "Decode failed: %x\n", err); continue; } if (!wav) { CStreamInfo *info = aacDecoder_GetStreamInfo(handle); if (!info || info->sampleRate <= 0) { fprintf(stderr, "No stream info\n"); break; } frame_size = info->frameSize * info->numChannels; // Note, this probably doesn't return channels > 2 in the right order for wav wav = wav_write_open(outfile, info->sampleRate, 16, info->numChannels); if (!wav) { perror(outfile); break; } } for (i = 0; i < frame_size; i++) { uint8_t* out = &output_buf[2*i]; out[0] = decode_buf[i] & 0xff; out[1] = decode_buf[i] >> 8; } wav_write_data(wav, output_buf, 2*frame_size); } free(output_buf); free(decode_buf); avformat_close_input(&in); if (wav) wav_write_close(wav); aacDecoder_Close(handle); return 0; }