140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
/* ------------------------------------------------------------------
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* Copyright (C) 2013 Martin Storsjo
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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* -------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "libAACdec/include/aacdecoder_lib.h"
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#include "wavwriter.h"
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#include <libavformat/avformat.h>
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#if LIBAVCODEC_VERSION_MAJOR < 55
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#define AV_CODEC_ID_AAC CODEC_ID_AAC
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#endif
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int main(int argc, char *argv[]) {
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const char *infile, *outfile;
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AVFormatContext *in = NULL;
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AVStream *st = NULL;
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void *wav = NULL;
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int output_size, ret, i;
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uint8_t *output_buf;
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int16_t *decode_buf;
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HANDLE_AACDECODER handle;
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AAC_DECODER_ERROR err;
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int frame_size = 0;
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if (argc < 3) {
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fprintf(stderr, "%s in.m4a out.wav\n", argv[0]);
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return 1;
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}
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infile = argv[1];
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outfile = argv[2];
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av_register_all();
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avformat_network_init();
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ret = avformat_open_input(&in, infile, NULL, NULL);
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if (ret < 0) {
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char buf[100];
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av_strerror(ret, buf, sizeof(buf));
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fprintf(stderr, "%s: %s\n", infile, buf);
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return 1;
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}
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for (i = 0; i < in->nb_streams && !st; i++) {
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if (in->streams[i]->codec->codec_id == AV_CODEC_ID_AAC)
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st = in->streams[i];
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}
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if (!st) {
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fprintf(stderr, "No AAC stream found\n");
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return 1;
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}
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if (!st->codec->extradata_size) {
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fprintf(stderr, "No AAC ASC found\n");
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return 1;
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}
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handle = aacDecoder_Open(TT_MP4_RAW, 1);
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err = aacDecoder_ConfigRaw(handle, &st->codec->extradata, &st->codec->extradata_size);
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if (err != AAC_DEC_OK) {
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fprintf(stderr, "Unable to decode the ASC\n");
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return 1;
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}
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output_size = 8*2*1024;
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output_buf = (uint8_t*) malloc(output_size);
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decode_buf = (int16_t*) malloc(output_size);
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while (1) {
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int i;
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UINT valid;
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AVPacket pkt = { 0 };
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int ret = av_read_frame(in, &pkt);
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if (ret < 0) {
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if (ret == AVERROR(EAGAIN))
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continue;
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break;
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}
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if (pkt.stream_index != st->index) {
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av_free_packet(&pkt);
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continue;
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}
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valid = pkt.size;
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err = aacDecoder_Fill(handle, &pkt.data, &pkt.size, &valid);
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if (err != AAC_DEC_OK) {
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fprintf(stderr, "Fill failed: %x\n", err);
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break;
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}
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err = aacDecoder_DecodeFrame(handle, decode_buf, output_size, 0);
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av_free_packet(&pkt);
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if (err == AAC_DEC_NOT_ENOUGH_BITS)
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continue;
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if (err != AAC_DEC_OK) {
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fprintf(stderr, "Decode failed: %x\n", err);
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continue;
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}
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if (!wav) {
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CStreamInfo *info = aacDecoder_GetStreamInfo(handle);
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if (!info || info->sampleRate <= 0) {
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fprintf(stderr, "No stream info\n");
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break;
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}
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frame_size = info->frameSize * info->numChannels;
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// Note, this probably doesn't return channels > 2 in the right order for wav
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wav = wav_write_open(outfile, info->sampleRate, 16, info->numChannels);
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if (!wav) {
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perror(outfile);
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break;
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}
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}
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for (i = 0; i < frame_size; i++) {
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uint8_t* out = &output_buf[2*i];
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out[0] = decode_buf[i] & 0xff;
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out[1] = decode_buf[i] >> 8;
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}
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wav_write_data(wav, output_buf, 2*frame_size);
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}
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free(output_buf);
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free(decode_buf);
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avformat_close_input(&in);
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if (wav)
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wav_write_close(wav);
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aacDecoder_Close(handle);
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return 0;
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}
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