FFmpeg
libopencore-amr.c
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1 /*
2  * AMR Audio decoder stub
3  * Copyright (c) 2003 The FFmpeg project
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <inttypes.h>
23 
24 #include "libavutil/avstring.h"
26 #include "libavutil/common.h"
27 #include "libavutil/opt.h"
28 #include "avcodec.h"
29 #include "audio_frame_queue.h"
30 #include "internal.h"
31 
32 #if CONFIG_LIBOPENCORE_AMRNB_DECODER || CONFIG_LIBOPENCORE_AMRWB_DECODER
33 static int amr_decode_fix_avctx(AVCodecContext *avctx)
34 {
35  const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
36 
37  if (!avctx->sample_rate)
38  avctx->sample_rate = 8000 * is_amr_wb;
39 
40  if (avctx->channels > 1) {
41  avpriv_report_missing_feature(avctx, "multi-channel AMR");
42  return AVERROR_PATCHWELCOME;
43  }
44 
45  avctx->channels = 1;
48  return 0;
49 }
50 #endif
51 
52 #if CONFIG_LIBOPENCORE_AMRNB
53 
54 #include <opencore-amrnb/interf_dec.h>
55 #include <opencore-amrnb/interf_enc.h>
56 
57 typedef struct AMRContext {
59  void *dec_state;
60  void *enc_state;
61  int enc_bitrate;
62  int enc_mode;
63  int enc_dtx;
64  int enc_last_frame;
65  AudioFrameQueue afq;
66 } AMRContext;
67 
68 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
69 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
70 {
71  AMRContext *s = avctx->priv_data;
72  int ret;
73 
74  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
75  return ret;
76 
77  s->dec_state = Decoder_Interface_init();
78  if (!s->dec_state) {
79  av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
80  return -1;
81  }
82 
83  return 0;
84 }
85 
86 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
87 {
88  AMRContext *s = avctx->priv_data;
89 
90  Decoder_Interface_exit(s->dec_state);
91 
92  return 0;
93 }
94 
95 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
96  int *got_frame_ptr, AVPacket *avpkt)
97 {
98  AVFrame *frame = data;
99  const uint8_t *buf = avpkt->data;
100  int buf_size = avpkt->size;
101  AMRContext *s = avctx->priv_data;
102  static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
103  enum Mode dec_mode;
104  int packet_size, ret;
105 
106  ff_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
107  buf, buf_size, avctx->frame_number);
108 
109  /* get output buffer */
110  frame->nb_samples = 160;
111  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
112  return ret;
113 
114  dec_mode = (buf[0] >> 3) & 0x000F;
115  packet_size = block_size[dec_mode] + 1;
116 
117  if (packet_size > buf_size) {
118  av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
119  buf_size, packet_size);
120  return AVERROR_INVALIDDATA;
121  }
122 
123  ff_dlog(avctx, "packet_size=%d buf= 0x%"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"\n",
124  packet_size, buf[0], buf[1], buf[2], buf[3]);
125  /* call decoder */
126  Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
127 
128  *got_frame_ptr = 1;
129 
130  return packet_size;
131 }
132 
134  .name = "libopencore_amrnb",
135  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
136  .type = AVMEDIA_TYPE_AUDIO,
137  .id = AV_CODEC_ID_AMR_NB,
138  .priv_data_size = sizeof(AMRContext),
139  .init = amr_nb_decode_init,
140  .close = amr_nb_decode_close,
141  .decode = amr_nb_decode_frame,
143 };
144 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
145 
146 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
147 /* Common code for fixed and float version*/
148 typedef struct AMR_bitrates {
149  int rate;
150  enum Mode mode;
151 } AMR_bitrates;
152 
153 /* Match desired bitrate */
154 static int get_bitrate_mode(int bitrate, void *log_ctx)
155 {
156  /* make the correspondence between bitrate and mode */
157  static const AMR_bitrates rates[] = {
158  { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
159  { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
160  };
161  int i, best = -1, min_diff = 0;
162  char log_buf[200];
163 
164  for (i = 0; i < 8; i++) {
165  if (rates[i].rate == bitrate)
166  return rates[i].mode;
167  if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
168  best = i;
169  min_diff = abs(rates[i].rate - bitrate);
170  }
171  }
172  /* no bitrate matching exactly, log a warning */
173  snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
174  for (i = 0; i < 8; i++)
175  av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
176  av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
177  av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
178 
179  return best;
180 }
181 
182 static const AVOption options[] = {
183  { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
184  { NULL }
185 };
186 
187 static const AVClass amrnb_class = {
188  .class_name = "libopencore_amrnb",
189  .item_name = av_default_item_name,
190  .option = options,
191  .version = LIBAVUTIL_VERSION_INT,
192 };
193 
194 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
195 {
196  AMRContext *s = avctx->priv_data;
197 
198  if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
199  av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
200  return AVERROR(ENOSYS);
201  }
202 
203  if (avctx->channels != 1) {
204  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
205  return AVERROR(ENOSYS);
206  }
207 
208  avctx->frame_size = 160;
209  avctx->initial_padding = 50;
210  ff_af_queue_init(avctx, &s->afq);
211 
212  s->enc_state = Encoder_Interface_init(s->enc_dtx);
213  if (!s->enc_state) {
214  av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
215  return -1;
216  }
217 
218  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
219  s->enc_bitrate = avctx->bit_rate;
220 
221  return 0;
222 }
223 
224 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
225 {
226  AMRContext *s = avctx->priv_data;
227 
228  Encoder_Interface_exit(s->enc_state);
229  ff_af_queue_close(&s->afq);
230  return 0;
231 }
232 
233 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
234  const AVFrame *frame, int *got_packet_ptr)
235 {
236  AMRContext *s = avctx->priv_data;
237  int written, ret;
238  int16_t *flush_buf = NULL;
239  const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
240 
241  if (s->enc_bitrate != avctx->bit_rate) {
242  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
243  s->enc_bitrate = avctx->bit_rate;
244  }
245 
246  if ((ret = ff_alloc_packet2(avctx, avpkt, 32, 0)) < 0)
247  return ret;
248 
249  if (frame) {
250  if (frame->nb_samples < avctx->frame_size) {
251  flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
252  if (!flush_buf)
253  return AVERROR(ENOMEM);
254  memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
255  samples = flush_buf;
256  if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
257  s->enc_last_frame = -1;
258  }
259  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
260  av_freep(&flush_buf);
261  return ret;
262  }
263  } else {
264  if (s->enc_last_frame < 0)
265  return 0;
266  flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
267  if (!flush_buf)
268  return AVERROR(ENOMEM);
269  samples = flush_buf;
270  s->enc_last_frame = -1;
271  }
272 
273  written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
274  avpkt->data, 0);
275  ff_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
276  written, s->enc_mode, avpkt->data[0]);
277 
278  /* Get the next frame pts/duration */
279  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
280  &avpkt->duration);
281 
282  avpkt->size = written;
283  *got_packet_ptr = 1;
284  av_freep(&flush_buf);
285  return 0;
286 }
287 
289  .name = "libopencore_amrnb",
290  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
291  .type = AVMEDIA_TYPE_AUDIO,
292  .id = AV_CODEC_ID_AMR_NB,
293  .priv_data_size = sizeof(AMRContext),
294  .init = amr_nb_encode_init,
295  .encode2 = amr_nb_encode_frame,
296  .close = amr_nb_encode_close,
298  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
300  .priv_class = &amrnb_class,
301 };
302 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
303 
304 #endif /* CONFIG_LIBOPENCORE_AMRNB */
305 
306 /* -----------AMR wideband ------------*/
307 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
308 
309 #include <opencore-amrwb/dec_if.h>
310 #include <opencore-amrwb/if_rom.h>
311 
312 typedef struct AMRWBContext {
313  void *state;
314 } AMRWBContext;
315 
316 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
317 {
318  AMRWBContext *s = avctx->priv_data;
319  int ret;
320 
321  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
322  return ret;
323 
324  s->state = D_IF_init();
325 
326  return 0;
327 }
328 
329 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
330  int *got_frame_ptr, AVPacket *avpkt)
331 {
332  AVFrame *frame = data;
333  const uint8_t *buf = avpkt->data;
334  int buf_size = avpkt->size;
335  AMRWBContext *s = avctx->priv_data;
336  int mode, ret;
337  int packet_size;
338  static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
339 
340  /* get output buffer */
341  frame->nb_samples = 320;
342  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
343  return ret;
344 
345  mode = (buf[0] >> 3) & 0x000F;
346  packet_size = block_size[mode];
347 
348  if (packet_size > buf_size) {
349  av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
350  buf_size, packet_size + 1);
351  return AVERROR_INVALIDDATA;
352  }
353  if (!packet_size) {
354  av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
355  return AVERROR_INVALIDDATA;
356  }
357 
358  D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
359 
360  *got_frame_ptr = 1;
361 
362  return packet_size;
363 }
364 
365 static int amr_wb_decode_close(AVCodecContext *avctx)
366 {
367  AMRWBContext *s = avctx->priv_data;
368 
369  D_IF_exit(s->state);
370  return 0;
371 }
372 
374  .name = "libopencore_amrwb",
375  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
376  .type = AVMEDIA_TYPE_AUDIO,
377  .id = AV_CODEC_ID_AMR_WB,
378  .priv_data_size = sizeof(AMRWBContext),
379  .init = amr_wb_decode_init,
380  .close = amr_wb_decode_close,
381  .decode = amr_wb_decode_frame,
383  .wrapper_name = "libopencore_amrwb",
384 };
385 
386 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1118
AVCodec
AVCodec.
Definition: codec.h:197
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:187
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
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
opt.h
AVCodecContext::channel_layout
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1149
ff_af_queue_remove
void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts, int64_t *duration)
Remove frame(s) from the queue.
Definition: audio_frame_queue.c:75
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1098
ff_af_queue_close
void ff_af_queue_close(AudioFrameQueue *afq)
Close AudioFrameQueue.
Definition: audio_frame_queue.c:36
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:953
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
ff_af_queue_init
av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
Initialize AudioFrameQueue.
Definition: audio_frame_queue.c:28
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
AVOption
AVOption.
Definition: opt.h:248
data
const char data[16]
Definition: mxf.c:142
AV_CODEC_ID_AMR_NB
@ AV_CODEC_ID_AMR_NB
Definition: codec_id.h:404
av_mallocz_array
void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.c:196
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:383
av_strlcatf
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
FF_COMPLIANCE_UNOFFICIAL
#define FF_COMPLIANCE_UNOFFICIAL
Allow unofficial extensions.
Definition: avcodec.h:1390
AV_CODEC_ID_AMR_WB
@ AV_CODEC_ID_AMR_WB
Definition: codec_id.h:405
ff_libopencore_amrnb_decoder
const AVCodec ff_libopencore_amrnb_decoder
audio_frame_queue.h
AVCodecContext::initial_padding
int initial_padding
Audio only.
Definition: avcodec.h:1807
ff_af_queue_add
int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
Add a frame to the queue.
Definition: audio_frame_queue.c:44
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
Mode
Mode
Frame type (Table 1a in 3GPP TS 26.101)
Definition: amrnbdata.h:39
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_OPT_FLAG_ENCODING_PARAM
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:278
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AudioFrameQueue
Definition: audio_frame_queue.h:32
av_class
static const AVClass av_class
Definition: options.c:134
AMRWBContext::state
void * state
Definition: libvo-amrwbenc.c:37
AMRContext
Definition: amrnbdec.c:100
f
#define f(width, name)
Definition: cbs_vp9.c:255
AV_OPT_FLAG_AUDIO_PARAM
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:280
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:511
if
if(ret)
Definition: filter_design.txt:179
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:551
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
abs
#define abs(x)
Definition: cuda_runtime.h:35
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:104
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
options
const OptionDef options[]
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1638
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1106
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
ff_libopencore_amrwb_decoder
const AVCodec ff_libopencore_amrwb_decoder
bitrate
int64_t bitrate
Definition: h264_levels.c:131
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:1099
i
int i
Definition: input.c:407
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:358
common.h
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:61
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AVCodecContext::strict_std_compliance
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1386
ff_libopencore_amrnb_encoder
const AVCodec ff_libopencore_amrnb_encoder
AVCodecContext
main external API structure.
Definition: avcodec.h:501
channel_layout.h
AMRWBContext
Definition: amrwbdec.c:47
rates
static const int rates[]
Definition: swresample.c:103
mode
mode
Definition: ebur128.h:83
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:77
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
AVCodecContext::frame_number
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1129
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
avstring.h
AV_CODEC_CAP_SMALL_LAST_FRAME
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: codec.h:82
ff_alloc_packet2
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:33
snprintf
#define snprintf
Definition: snprintf.h:34