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"
32 #include "libavutil/common.h"
33 #include "libavutil/mem.h"
34 #include "libavutil/samplefmt.h"
35 
36 #define NUMBER_OF_AUDIO_FRAMES 200
37 #define NAME_BUFF_SIZE 100
38 
39 /* generate i-th frame of test audio */
40 static int generate_raw_frame(uint16_t *frame_data, int i, int sample_rate,
41  int channels, int frame_size)
42 {
43  int j, k;
44 
45  for (j = 0; j < frame_size; j++) {
46  frame_data[channels * j] = 10000 * ((j / 10 * i) % 2);
47  for (k = 1; k < channels; k++)
48  frame_data[channels * j + k] = frame_data[channels * j] * (k + 1);
49  }
50  return 0;
51 }
52 
53 static int init_encoder(const AVCodec *enc, AVCodecContext **enc_ctx,
54  const AVChannelLayout *ch_layout, int sample_rate)
55 {
57  int result;
58  char name_buff[NAME_BUFF_SIZE];
59 
60  av_channel_layout_describe(ch_layout, name_buff, NAME_BUFF_SIZE);
61  av_log(NULL, AV_LOG_INFO, "channel layout: %s, sample rate: %i\n", name_buff, sample_rate);
62 
64  if (!ctx) {
65  av_log(NULL, AV_LOG_ERROR, "Can't allocate encoder context\n");
66  return AVERROR(ENOMEM);
67  }
68 
69  ctx->sample_fmt = AV_SAMPLE_FMT_S16;
70  ctx->sample_rate = sample_rate;
71  av_channel_layout_copy(&ctx->ch_layout, ch_layout);
72 
73  result = avcodec_open2(ctx, enc, NULL);
74  if (result < 0) {
75  av_log(ctx, AV_LOG_ERROR, "Can't open encoder\n");
76  return result;
77  }
78 
79  *enc_ctx = ctx;
80  return 0;
81 }
82 
83 static int init_decoder(const AVCodec *dec, AVCodecContext **dec_ctx,
84  const AVChannelLayout *ch_layout)
85 {
87  int result;
88 
90  if (!ctx) {
91  av_log(NULL, AV_LOG_ERROR , "Can't allocate decoder context\n");
92  return AVERROR(ENOMEM);
93  }
94 
95  ctx->request_sample_fmt = AV_SAMPLE_FMT_S16;
96  av_channel_layout_copy(&ctx->ch_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(const AVCodec *enc, const AVCodec *dec,
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  result = av_channel_layout_copy(&in_frame->ch_layout, &enc_ctx->ch_layout);
134  if (result < 0)
135  return result;
136  if (av_frame_get_buffer(in_frame, 0) != 0) {
137  av_log(NULL, AV_LOG_ERROR, "Can't allocate a buffer for input frame\n");
138  return AVERROR(ENOMEM);
139  }
140 
141  out_frame = av_frame_alloc();
142  if (!out_frame) {
143  av_log(NULL, AV_LOG_ERROR, "Can't allocate output frame\n");
144  return AVERROR(ENOMEM);
145  }
146 
147  raw_in = av_malloc(in_frame->linesize[0] * NUMBER_OF_AUDIO_FRAMES);
148  if (!raw_in) {
149  av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_in\n");
150  return AVERROR(ENOMEM);
151  }
152 
153  raw_out = av_malloc(in_frame->linesize[0] * NUMBER_OF_AUDIO_FRAMES);
154  if (!raw_out) {
155  av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for raw_out\n");
156  return AVERROR(ENOMEM);
157  }
158 
159  for (i = 0; i < NUMBER_OF_AUDIO_FRAMES; i++) {
160  result = av_frame_make_writable(in_frame);
161  if (result < 0)
162  return result;
163 
164  generate_raw_frame((uint16_t*)(in_frame->data[0]), i, enc_ctx->sample_rate,
165  enc_ctx->ch_layout.nb_channels, enc_ctx->frame_size);
166  in_frame_bytes = in_frame->nb_samples * in_frame->ch_layout.nb_channels * sizeof(uint16_t);
167  if (in_frame_bytes > in_frame->linesize[0]) {
168  av_log(NULL, AV_LOG_ERROR, "Incorrect value of input frame linesize\n");
169  return 1;
170  }
171  memcpy(raw_in + in_offset, in_frame->data[0], in_frame_bytes);
172  in_offset += in_frame_bytes;
173  result = avcodec_send_frame(enc_ctx, in_frame);
174  if (result < 0) {
175  av_log(NULL, AV_LOG_ERROR, "Error submitting a frame for encoding\n");
176  return result;
177  }
178 
179  while (result >= 0) {
180  result = avcodec_receive_packet(enc_ctx, enc_pkt);
181  if (result == AVERROR(EAGAIN))
182  break;
183  else if (result < 0 && result != AVERROR_EOF) {
184  av_log(NULL, AV_LOG_ERROR, "Error encoding audio frame\n");
185  return result;
186  }
187 
188  /* if we get an encoded packet, feed it straight to the decoder */
189  result = avcodec_send_packet(dec_ctx, enc_pkt);
190  av_packet_unref(enc_pkt);
191  if (result < 0) {
192  av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
193  return result;
194  }
195 
196  result = avcodec_receive_frame(dec_ctx, out_frame);
197  if (result == AVERROR(EAGAIN)) {
198  result = 0;
199  continue;
200  } else if (result == AVERROR(EOF)) {
201  result = 0;
202  break;
203  } else if (result < 0) {
204  av_log(NULL, AV_LOG_ERROR, "Error decoding audio packet\n");
205  return result;
206  }
207 
208  if (in_frame->nb_samples != out_frame->nb_samples) {
209  av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different number of samples\n");
210  return AVERROR_UNKNOWN;
211  }
212 
213  if (av_channel_layout_compare(&in_frame->ch_layout, &out_frame->ch_layout)) {
214  av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different channel layout\n");
215  return AVERROR_UNKNOWN;
216  }
217 
218  if (in_frame->format != out_frame->format) {
219  av_log(NULL, AV_LOG_ERROR, "Error frames before and after decoding has different sample format\n");
220  return AVERROR_UNKNOWN;
221  }
222  out_frame_bytes = out_frame->nb_samples * out_frame->ch_layout.nb_channels * sizeof(uint16_t);
223  if (out_frame_bytes > out_frame->linesize[0]) {
224  av_log(NULL, AV_LOG_ERROR, "Incorrect value of output frame linesize\n");
225  return 1;
226  }
227  memcpy(raw_out + out_offset, out_frame->data[0], out_frame_bytes);
228  out_offset += out_frame_bytes;
229  }
230  }
231 
232  if (memcmp(raw_in, raw_out, out_frame_bytes * NUMBER_OF_AUDIO_FRAMES) != 0) {
233  av_log(NULL, AV_LOG_ERROR, "Output differs\n");
234  return 1;
235  }
236 
237  av_log(NULL, AV_LOG_INFO, "OK\n");
238 
239  av_freep(&raw_in);
240  av_freep(&raw_out);
241  av_packet_free(&enc_pkt);
242  av_frame_free(&in_frame);
243  av_frame_free(&out_frame);
244  return 0;
245 }
246 
247 int main(void)
248 {
249  const AVCodec *enc = NULL, *dec = NULL;
250  AVCodecContext *enc_ctx = NULL, *dec_ctx = NULL;
255  int sample_rates[] = {8000, 44100, 48000, 192000};
256  int cl, sr;
257 
259  if (!enc) {
260  av_log(NULL, AV_LOG_ERROR, "Can't find encoder\n");
261  return 1;
262  }
263 
265  if (!dec) {
266  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
267  return 1;
268  }
269 
270  for (cl = 0; cl < FF_ARRAY_ELEMS(channel_layouts); cl++) {
271  for (sr = 0; sr < FF_ARRAY_ELEMS(sample_rates); sr++) {
272  if (init_encoder(enc, &enc_ctx, &channel_layouts[cl], sample_rates[sr]) != 0)
273  return 1;
274  if (init_decoder(dec, &dec_ctx, &channel_layouts[cl]) != 0)
275  return 1;
276  if (run_test(enc, dec, enc_ctx, dec_ctx) != 0)
277  return 1;
278  avcodec_free_context(&enc_ctx);
280  }
281  }
282 
283  return 0;
284 }
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1077
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: packet.c:427
AVCodec
AVCodec.
Definition: codec.h:187
AV_CHANNEL_LAYOUT_STEREO_DOWNMIX
#define AV_CHANNEL_LAYOUT_STEREO_DOWNMIX
Definition: channel_layout.h:421
dec_ctx
static AVCodecContext * dec_ctx
Definition: decode_filter_audio.c:47
avcodec_receive_packet
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Definition: encode.c:541
AVERROR
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
av_frame_get_buffer
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
Definition: frame.c:288
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:387
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1050
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:160
avcodec_find_encoder
const AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: allcodecs.c:959
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
av_frame_make_writable
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:662
AV_CODEC_ID_FLAC
@ AV_CODEC_ID_FLAC
Definition: codec_id.h:452
AVERROR_UNKNOWN
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:73
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:321
sample_rate
sample_rate
Definition: ffmpeg_filter.c:424
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: packet.c:74
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:1065
samplefmt.h
AVFrame::ch_layout
AVChannelLayout ch_layout
Channel layout of the audio data.
Definition: frame.h:775
AV_CHANNEL_LAYOUT_SURROUND
#define AV_CHANNEL_LAYOUT_SURROUND
Definition: channel_layout.h:390
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:148
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
init_decoder
static int init_decoder(const AVCodec *dec, AVCodecContext **dec_ctx, const AVChannelLayout *ch_layout)
Definition: api-flac-test.c:83
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_channel_layout_describe
int av_channel_layout_describe(const AVChannelLayout *channel_layout, char *buf, size_t buf_size)
Get a human-readable string describing the channel layout properties.
Definition: channel_layout.c:648
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:149
frame_size
int frame_size
Definition: mxfenc.c:2423
avcodec_receive_frame
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
Definition: avcodec.c:698
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Definition: movenc.c:49
channels
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Definition: aptx.h:31
init_encoder
static int init_encoder(const AVCodec *enc, AVCodecContext **enc_ctx, const AVChannelLayout *ch_layout, int sample_rate)
Definition: api-flac-test.c:53
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
avcodec_free_context
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:164
avcodec_open2
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_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:964
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:311
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1057
NAME_BUFF_SIZE
#define NAME_BUFF_SIZE
Definition: api-flac-test.c:37
run_test
static int run_test(const AVCodec *enc, const AVCodec *dec, AVCodecContext *enc_ctx, AVCodecContext *dec_ctx)
Definition: api-flac-test.c:108
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:461
frame_data
FrameData * frame_data(AVFrame *frame)
Get our axiliary frame data attached to the frame, allocating it if needed.
Definition: ffmpeg.c:452
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: packet.c:63
av_channel_layout_compare
int av_channel_layout_compare(const AVChannelLayout *chl, const AVChannelLayout *chl1)
Check whether two channel layouts are semantically the same, i.e.
Definition: channel_layout.c:804
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
sample_rates
sample_rates
Definition: ffmpeg_filter.c:424
NUMBER_OF_AUDIO_FRAMES
#define NUMBER_OF_AUDIO_FRAMES
Definition: api-flac-test.c:36
avcodec_send_packet
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:696
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:454
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
common.h
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:58
avcodec_send_frame
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
Definition: encode.c:508
avcodec.h
main
int main(void)
Definition: api-flac-test.c:247
AVCodecContext
main external API structure.
Definition: avcodec.h:445
channel_layout.h
av_channel_layout_copy
int av_channel_layout_copy(AVChannelLayout *dst, const AVChannelLayout *src)
Make a copy of a channel layout.
Definition: channel_layout.c:444
mem.h
AVPacket
This structure stores compressed data.
Definition: packet.h:497
channel_layouts
static const uint16_t channel_layouts[7]
Definition: dca_lbr.c:112
generate_raw_frame
static int generate_raw_frame(uint16_t *frame_data, int i, int sample_rate, int channels, int frame_size)
Definition: api-flac-test.c:40
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
AV_CHANNEL_LAYOUT_5POINT1_BACK
#define AV_CHANNEL_LAYOUT_5POINT1_BACK
Definition: channel_layout.h:399
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:419
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27