mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-12-05 01:57:02 +00:00
b27dd80255
Found-by: ubitux
153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
/*
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* Copyright (c) 2001 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* @file
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* audio decoding with libavcodec API example
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*
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* @example decode_audio.c
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libavutil/frame.h>
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#include <libavutil/mem.h>
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#include <libavcodec/avcodec.h>
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#define AUDIO_INBUF_SIZE 20480
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#define AUDIO_REFILL_THRESH 4096
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int main(int argc, char **argv)
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{
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const char *outfilename, *filename;
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const AVCodec *codec;
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AVCodecContext *c= NULL;
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int len;
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FILE *f, *outfile;
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uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
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AVPacket avpkt;
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AVFrame *decoded_frame = NULL;
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if (argc <= 2) {
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fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
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exit(0);
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}
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filename = argv[1];
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outfilename = argv[2];
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/* register all the codecs */
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avcodec_register_all();
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av_init_packet(&avpkt);
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/* find the MPEG audio decoder */
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codec = avcodec_find_decoder(AV_CODEC_ID_MP2);
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if (!codec) {
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fprintf(stderr, "Codec not found\n");
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exit(1);
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}
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c = avcodec_alloc_context3(codec);
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if (!c) {
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fprintf(stderr, "Could not allocate audio codec context\n");
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exit(1);
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}
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/* open it */
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if (avcodec_open2(c, codec, NULL) < 0) {
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fprintf(stderr, "Could not open codec\n");
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exit(1);
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}
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f = fopen(filename, "rb");
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if (!f) {
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fprintf(stderr, "Could not open %s\n", filename);
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exit(1);
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}
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outfile = fopen(outfilename, "wb");
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if (!outfile) {
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av_free(c);
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exit(1);
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}
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/* decode until eof */
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avpkt.data = inbuf;
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avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
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while (avpkt.size > 0) {
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int i, ch;
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int got_frame = 0;
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if (!decoded_frame) {
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if (!(decoded_frame = av_frame_alloc())) {
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fprintf(stderr, "Could not allocate audio frame\n");
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exit(1);
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}
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}
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len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt);
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if (len < 0) {
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fprintf(stderr, "Error while decoding\n");
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exit(1);
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}
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if (got_frame) {
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/* if a frame has been decoded, output it */
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int data_size = av_get_bytes_per_sample(c->sample_fmt);
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if (data_size < 0) {
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/* This should not occur, checking just for paranoia */
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fprintf(stderr, "Failed to calculate data size\n");
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exit(1);
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}
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for (i=0; i<decoded_frame->nb_samples; i++)
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for (ch=0; ch<c->channels; ch++)
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fwrite(decoded_frame->data[ch] + data_size*i, 1, data_size, outfile);
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}
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avpkt.size -= len;
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avpkt.data += len;
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avpkt.dts =
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avpkt.pts = AV_NOPTS_VALUE;
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if (avpkt.size < AUDIO_REFILL_THRESH) {
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/* Refill the input buffer, to avoid trying to decode
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* incomplete frames. Instead of this, one could also use
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* a parser, or use a proper container format through
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* libavformat. */
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memmove(inbuf, avpkt.data, avpkt.size);
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avpkt.data = inbuf;
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len = fread(avpkt.data + avpkt.size, 1,
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AUDIO_INBUF_SIZE - avpkt.size, f);
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if (len > 0)
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avpkt.size += len;
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}
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}
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fclose(outfile);
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fclose(f);
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avcodec_free_context(&c);
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av_frame_free(&decoded_frame);
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return 0;
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}
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