FFmpeg
api-flac-test.c
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1 /*
2  * Copyright (c) 2015 Ludmila Glinskih
3  * Copyright (c) 2001 Fabrice Bellard
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a copy
6  * of this software and associated documentation files (the "Software"), to deal
7  * in the Software without restriction, including without limitation the rights
8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9  * copies of the Software, and to permit persons to whom the Software is
10  * furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be included in
13  * all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21  * THE SOFTWARE.
22  */
23 
24 /*
25  * FLAC codec test.
26  * Encodes raw data to FLAC format and decodes it back to raw. Compares raw-data
27  * after that.
28  */
29 
30 #include "libavcodec/avcodec.h"
31 #include "libavutil/common.h"
32 #include "libavutil/samplefmt.h"
33 
34 #define NUMBER_OF_AUDIO_FRAMES 200
35 #define NAME_BUFF_SIZE 100
36 
37 /* generate i-th frame of test audio */
38 static int generate_raw_frame(uint16_t *frame_data, int i, int sample_rate,
39  int channels, int frame_size)
40 {
41  int j, k;
42 
43  for (j = 0; j < frame_size; j++) {
44  frame_data[channels * j] = 10000 * ((j / 10 * i) % 2);
45  for (k = 1; k < channels; k++)
46  frame_data[channels * j + k] = frame_data[channels * j] * (k + 1);
47  }
48  return 0;
49 }
50 
51 static int init_encoder(AVCodec *enc, AVCodecContext **enc_ctx,
52  int64_t ch_layout, int sample_rate)
53 {
55  int result;
56  char name_buff[NAME_BUFF_SIZE];
57 
58  av_get_channel_layout_string(name_buff, NAME_BUFF_SIZE, 0, ch_layout);
59  av_log(NULL, AV_LOG_INFO, "channel layout: %s, sample rate: %i\n", name_buff, sample_rate);
60 
61  ctx = avcodec_alloc_context3(enc);
62  if (!ctx) {
63  av_log(NULL, AV_LOG_ERROR, "Can't allocate encoder context\n");
64  return AVERROR(ENOMEM);
65  }
66 
68  ctx->sample_rate = sample_rate;
69  ctx->channel_layout = ch_layout;
70 
71  result = avcodec_open2(ctx, enc, NULL);
72  if (result < 0) {
73  av_log(ctx, AV_LOG_ERROR, "Can't open encoder\n");
74  return result;
75  }
76 
77  *enc_ctx = ctx;
78  return 0;
79 }
80 
82  int64_t ch_layout)
83 {
85  int result;
86 
87  ctx = avcodec_alloc_context3(dec);
88  if (!ctx) {
89  av_log(NULL, AV_LOG_ERROR , "Can't allocate decoder context\n");
90  return AVERROR(ENOMEM);
91  }
92 
94  /* XXX: FLAC ignores it for some reason */
95  ctx->request_channel_layout = ch_layout;
96  ctx->channel_layout = ch_layout;
97 
98  result = avcodec_open2(ctx, dec, NULL);
99  if (result < 0) {
100  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
101  return result;
102  }
103 
104  *dec_ctx = ctx;
105  return 0;
106 }
107 
108 static int run_test(AVCodec *enc, AVCodec *dec, AVCodecContext *enc_ctx,
110 {
111  AVPacket *enc_pkt;
112  AVFrame *in_frame, *out_frame;
113  uint8_t *raw_in = NULL, *raw_out = NULL;
114  int in_offset = 0, out_offset = 0;
115  int result = 0;
116  int i = 0;
117  int in_frame_bytes, out_frame_bytes;
118 
119  enc_pkt = av_packet_alloc();
120  if (!enc_pkt) {
121  av_log(NULL, AV_LOG_ERROR, "Can't allocate output packet\n");
122  return AVERROR(ENOMEM);
123  }
124 
125  in_frame = av_frame_alloc();
126  if (!in_frame) {
127  av_log(NULL, AV_LOG_ERROR, "Can't allocate input frame\n");
128  return AVERROR(ENOMEM);
129  }
130 
131  in_frame->nb_samples = enc_ctx->frame_size;
132  in_frame->format = enc_ctx->sample_fmt;
133  in_frame->channel_layout = enc_ctx->channel_layout;
134  if (av_frame_get_buffer(in_frame, 0) != 0) {
135  av_log(NULL, AV_LOG_ERROR, "Can't allocate a buffer for input frame\n");
136  return AVERROR(ENOMEM);
137  }
138 
139  out_frame = av_frame_alloc();
140  if (!out_frame) {
141  av_log(NULL, AV_LOG_ERROR, "Can't allocate output frame\n");
142  return AVERROR(ENOMEM);
143  }
144 
145  raw_in = av_malloc(in_frame->linesize[0] * NUMBER_OF_AUDIO_FRAMES);
146  if (!raw_in) {
147  av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_in\n");
148  return AVERROR(ENOMEM);
149  }
150 
151  raw_out = av_malloc(in_frame->linesize[0] * NUMBER_OF_AUDIO_FRAMES);
152  if (!raw_out) {
153  av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_out\n");
154  return AVERROR(ENOMEM);
155  }
156 
157  for (i = 0; i < NUMBER_OF_AUDIO_FRAMES; i++) {
158  result = av_frame_make_writable(in_frame);
159  if (result < 0)
160  return result;
161 
162  generate_raw_frame((uint16_t*)(in_frame->data[0]), i, enc_ctx->sample_rate,
163  enc_ctx->channels, enc_ctx->frame_size);
164  in_frame_bytes = in_frame->nb_samples * in_frame->channels * sizeof(uint16_t);
165  if (in_frame_bytes > in_frame->linesize[0]) {
166  av_log(NULL, AV_LOG_ERROR, "Incorrect value of input frame linesize\n");
167  return 1;
168  }
169  memcpy(raw_in + in_offset, in_frame->data[0], in_frame_bytes);
170  in_offset += in_frame_bytes;
171  result = avcodec_send_frame(enc_ctx, in_frame);
172  if (result < 0) {
173  av_log(NULL, AV_LOG_ERROR, "Error submitting a frame for encoding\n");
174  return result;
175  }
176 
177  while (result >= 0) {
178  result = avcodec_receive_packet(enc_ctx, enc_pkt);
179  if (result == AVERROR(EAGAIN))
180  break;
181  else if (result < 0 && result != AVERROR_EOF) {
182  av_log(NULL, AV_LOG_ERROR, "Error encoding audio frame\n");
183  return result;
184  }
185 
186  /* if we get an encoded packet, feed it straight to the decoder */
187  result = avcodec_send_packet(dec_ctx, enc_pkt);
188  av_packet_unref(enc_pkt);
189  if (result < 0) {
190  av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
191  return result;
192  }
193 
194  result = avcodec_receive_frame(dec_ctx, out_frame);
195  if (result == AVERROR(EAGAIN)) {
196  result = 0;
197  continue;
198  } else if (result == AVERROR(EOF)) {
199  result = 0;
200  break;
201  } else if (result < 0) {
202  av_log(NULL, AV_LOG_ERROR, "Error decoding audio packet\n");
203  return result;
204  }
205 
206  if (in_frame->nb_samples != out_frame->nb_samples) {
207  av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different number of samples\n");
208  return AVERROR_UNKNOWN;
209  }
210 
211  if (in_frame->channel_layout != out_frame->channel_layout) {
212  av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different channel layout\n");
213  return AVERROR_UNKNOWN;
214  }
215 
216  if (in_frame->format != out_frame->format) {
217  av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different sample format\n");
218  return AVERROR_UNKNOWN;
219  }
220  out_frame_bytes = out_frame->nb_samples * out_frame->channels * sizeof(uint16_t);
221  if (out_frame_bytes > out_frame->linesize[0]) {
222  av_log(NULL, AV_LOG_ERROR, "Incorrect value of output frame linesize\n");
223  return 1;
224  }
225  memcpy(raw_out + out_offset, out_frame->data[0], out_frame_bytes);
226  out_offset += out_frame_bytes;
227  }
228  }
229 
230  if (memcmp(raw_in, raw_out, out_frame_bytes * NUMBER_OF_AUDIO_FRAMES) != 0) {
231  av_log(NULL, AV_LOG_ERROR, "Output differs\n");
232  return 1;
233  }
234 
235  av_log(NULL, AV_LOG_INFO, "OK\n");
236 
237  av_freep(&raw_in);
238  av_freep(&raw_out);
239  av_packet_free(&enc_pkt);
240  av_frame_free(&in_frame);
241  av_frame_free(&out_frame);
242  return 0;
243 }
244 
245 int main(void)
246 {
247  AVCodec *enc = NULL, *dec = NULL;
248  AVCodecContext *enc_ctx = NULL, *dec_ctx = NULL;
250  int sample_rates[] = {8000, 44100, 48000, 192000};
251  int cl, sr;
252 
254  if (!enc) {
255  av_log(NULL, AV_LOG_ERROR, "Can't find encoder\n");
256  return 1;
257  }
258 
260  if (!dec) {
261  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
262  return 1;
263  }
264 
265  for (cl = 0; cl < FF_ARRAY_ELEMS(channel_layouts); cl++) {
266  for (sr = 0; sr < FF_ARRAY_ELEMS(sample_rates); sr++) {
267  if (init_encoder(enc, &enc_ctx, channel_layouts[cl], sample_rates[sr]) != 0)
268  return 1;
269  if (init_decoder(dec, &dec_ctx, channel_layouts[cl]) != 0)
270  return 1;
271  if (run_test(enc, dec, enc_ctx, dec_ctx) != 0)
272  return 1;
273  avcodec_free_context(&enc_ctx);
274  avcodec_free_context(&dec_ctx);
275  }
276  }
277 
278  return 0;
279 }
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
static int run_test(AVCodec *enc, AVCodec *dec, AVCodecContext *enc_ctx, AVCodecContext *dec_ctx)
#define AV_CH_LAYOUT_SURROUND
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Definition: encode.c:395
#define FF_ARRAY_ELEMS(a)
#define AV_CH_LAYOUT_STEREO
AVCodec.
Definition: codec.h:197
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1204
uint8_t
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:191
#define AVERROR_EOF
End of file.
Definition: error.h:55
channels
Definition: aptx.h:33
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:204
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:1269
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:643
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: allcodecs.c:941
#define NAME_BUFF_SIZE
Definition: api-flac-test.c:35
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1247
uint64_t channel_layout
Channel layout of the audio data.
Definition: frame.h:495
int channels
number of audio channels, only used for audio.
Definition: frame.h:624
#define AV_CH_LAYOUT_STEREO_DOWNMIX
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:170
AVFormatContext * ctx
Definition: movenc.c:48
#define AV_CH_LAYOUT_5POINT1_BACK
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout)
Return a description of a channel layout.
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:391
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:580
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1216
sample_rate
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
int frame_size
Definition: mxfenc.c:2206
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...
Definition: options.c:185
int sample_rate
samples per second
Definition: avcodec.h:1196
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
main external API structure.
Definition: avcodec.h:536
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
Definition: encode.c:364
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:114
static int init_encoder(AVCodec *enc, AVCodecContext **enc_ctx, int64_t ch_layout, int sample_rate)
Definition: api-flac-test.c:51
int main(void)
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:142
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:946
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
Definition: frame.c:338
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:612
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
#define NUMBER_OF_AUDIO_FRAMES
Definition: api-flac-test.c:34
sample_rates
common internal and external API header
signed 16 bits
Definition: samplefmt.h:61
static AVCodecContext * dec_ctx
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
static int generate_raw_frame(uint16_t *frame_data, int i, int sample_rate, int channels, int frame_size)
Definition: api-flac-test.c:38
int channels
number of audio channels
Definition: avcodec.h:1197
static int init_decoder(AVCodec *dec, AVCodecContext **dec_ctx, int64_t ch_layout)
Definition: api-flac-test.c:81
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
and forward the result(frame or status change) to the corresponding input.If nothing is possible
#define av_freep(p)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:1254
This structure stores compressed data.
Definition: packet.h:346
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:384
int i
Definition: input.c:407