FFmpeg  3.4.4
decode_audio.c
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1 /*
2  * Copyright (c) 2001 Fabrice Bellard
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a copy
5  * of this software and associated documentation files (the "Software"), to deal
6  * in the Software without restriction, including without limitation the rights
7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8  * copies of the Software, and to permit persons to whom the Software is
9  * furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20  * THE SOFTWARE.
21  */
22 
23 /**
24  * @file
25  * audio decoding with libavcodec API example
26  *
27  * @example decode_audio.c
28  */
29 
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 
34 #include <libavutil/frame.h>
35 #include <libavutil/mem.h>
36 
37 #include <libavcodec/avcodec.h>
38 
39 #define AUDIO_INBUF_SIZE 20480
40 #define AUDIO_REFILL_THRESH 4096
41 
43  FILE *outfile)
44 {
45  int i, ch;
46  int ret, data_size;
47 
48  /* send the packet with the compressed data to the decoder */
49  ret = avcodec_send_packet(dec_ctx, pkt);
50  if (ret < 0) {
51  fprintf(stderr, "Error submitting the packet to the decoder\n");
52  exit(1);
53  }
54 
55  /* read all the output frames (in general there may be any number of them */
56  while (ret >= 0) {
57  ret = avcodec_receive_frame(dec_ctx, frame);
58  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
59  return;
60  else if (ret < 0) {
61  fprintf(stderr, "Error during decoding\n");
62  exit(1);
63  }
64  data_size = av_get_bytes_per_sample(dec_ctx->sample_fmt);
65  if (data_size < 0) {
66  /* This should not occur, checking just for paranoia */
67  fprintf(stderr, "Failed to calculate data size\n");
68  exit(1);
69  }
70  for (i = 0; i < frame->nb_samples; i++)
71  for (ch = 0; ch < dec_ctx->channels; ch++)
72  fwrite(frame->data[ch] + data_size*i, 1, data_size, outfile);
73  }
74 }
75 
76 int main(int argc, char **argv)
77 {
78  const char *outfilename, *filename;
79  const AVCodec *codec;
80  AVCodecContext *c= NULL;
81  AVCodecParserContext *parser = NULL;
82  int len, ret;
83  FILE *f, *outfile;
85  uint8_t *data;
86  size_t data_size;
87  AVPacket *pkt;
88  AVFrame *decoded_frame = NULL;
89 
90  if (argc <= 2) {
91  fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
92  exit(0);
93  }
94  filename = argv[1];
95  outfilename = argv[2];
96 
97  /* register all the codecs */
99 
100  pkt = av_packet_alloc();
101 
102  /* find the MPEG audio decoder */
104  if (!codec) {
105  fprintf(stderr, "Codec not found\n");
106  exit(1);
107  }
108 
109  parser = av_parser_init(codec->id);
110  if (!parser) {
111  fprintf(stderr, "Parser not found\n");
112  exit(1);
113  }
114 
115  c = avcodec_alloc_context3(codec);
116  if (!c) {
117  fprintf(stderr, "Could not allocate audio codec context\n");
118  exit(1);
119  }
120 
121  /* open it */
122  if (avcodec_open2(c, codec, NULL) < 0) {
123  fprintf(stderr, "Could not open codec\n");
124  exit(1);
125  }
126 
127  f = fopen(filename, "rb");
128  if (!f) {
129  fprintf(stderr, "Could not open %s\n", filename);
130  exit(1);
131  }
132  outfile = fopen(outfilename, "wb");
133  if (!outfile) {
134  av_free(c);
135  exit(1);
136  }
137 
138  /* decode until eof */
139  data = inbuf;
140  data_size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
141 
142  while (data_size > 0) {
143  if (!decoded_frame) {
144  if (!(decoded_frame = av_frame_alloc())) {
145  fprintf(stderr, "Could not allocate audio frame\n");
146  exit(1);
147  }
148  }
149 
150  ret = av_parser_parse2(parser, c, &pkt->data, &pkt->size,
151  data, data_size,
153  if (ret < 0) {
154  fprintf(stderr, "Error while parsing\n");
155  exit(1);
156  }
157  data += ret;
158  data_size -= ret;
159 
160  if (pkt->size)
161  decode(c, pkt, decoded_frame, outfile);
162 
163  if (data_size < AUDIO_REFILL_THRESH) {
164  memmove(inbuf, data, data_size);
165  data = inbuf;
166  len = fread(data + data_size, 1,
167  AUDIO_INBUF_SIZE - data_size, f);
168  if (len > 0)
169  data_size += len;
170  }
171  }
172 
173  /* flush the decoder */
174  pkt->data = NULL;
175  pkt->size = 0;
176  decode(c, pkt, decoded_frame, outfile);
177 
178  fclose(outfile);
179  fclose(f);
180 
182  av_parser_close(parser);
183  av_frame_free(&decoded_frame);
184  av_packet_free(&pkt);
185 
186  return 0;
187 }
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
Memory handling functions.
int size
Definition: avcodec.h:1680
static AVPacket pkt
void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time...
AVCodec.
Definition: avcodec.h:3739
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2531
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
#define AUDIO_REFILL_THRESH
Definition: decode_audio.c:40
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1679
#define AVERROR_EOF
End of file.
Definition: error.h:55
enum AVCodecID id
Definition: avcodec.h:3753
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
reference-counted frame API
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
void av_parser_close(AVCodecParserContext *s)
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
AVCodecParserContext * av_parser_init(int codec_id)
Libavcodec external API header.
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
main external API structure.
Definition: avcodec.h:1761
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
#define AUDIO_INBUF_SIZE
Definition: decode_audio.c:39
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
void av_free(void *ptr)
Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family...
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
static AVCodecContext * dec_ctx
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:777
int channels
number of audio channels
Definition: avcodec.h:2524
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
int main(int argc, char **argv)
Definition: decode_audio.c:76
This structure stores compressed data.
Definition: avcodec.h:1656
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:267
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248