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 "encode.h"
31 #include "internal.h"
32 
33 #if CONFIG_LIBOPENCORE_AMRNB_DECODER || CONFIG_LIBOPENCORE_AMRWB_DECODER
34 static int amr_decode_fix_avctx(AVCodecContext *avctx)
35 {
36  const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB);
37 
38  if (!avctx->sample_rate)
39  avctx->sample_rate = 8000 * is_amr_wb;
40 
41  if (avctx->channels > 1) {
42  avpriv_report_missing_feature(avctx, "multi-channel AMR");
43  return AVERROR_PATCHWELCOME;
44  }
45 
46  avctx->channels = 1;
49  return 0;
50 }
51 #endif
52 
53 #if CONFIG_LIBOPENCORE_AMRNB
54 
55 #include <opencore-amrnb/interf_dec.h>
56 #include <opencore-amrnb/interf_enc.h>
57 
58 typedef struct AMRContext {
60  void *dec_state;
61  void *enc_state;
62  int enc_bitrate;
63  int enc_mode;
64  int enc_dtx;
65  int enc_last_frame;
66  AudioFrameQueue afq;
67 } AMRContext;
68 
69 #if CONFIG_LIBOPENCORE_AMRNB_DECODER
70 static av_cold int amr_nb_decode_init(AVCodecContext *avctx)
71 {
72  AMRContext *s = avctx->priv_data;
73  int ret;
74 
75  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
76  return ret;
77 
78  s->dec_state = Decoder_Interface_init();
79  if (!s->dec_state) {
80  av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n");
81  return -1;
82  }
83 
84  return 0;
85 }
86 
87 static av_cold int amr_nb_decode_close(AVCodecContext *avctx)
88 {
89  AMRContext *s = avctx->priv_data;
90 
91  Decoder_Interface_exit(s->dec_state);
92 
93  return 0;
94 }
95 
96 static int amr_nb_decode_frame(AVCodecContext *avctx, void *data,
97  int *got_frame_ptr, AVPacket *avpkt)
98 {
99  AVFrame *frame = data;
100  const uint8_t *buf = avpkt->data;
101  int buf_size = avpkt->size;
102  AMRContext *s = avctx->priv_data;
103  static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
104  enum Mode dec_mode;
105  int packet_size, ret;
106 
107  ff_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n",
108  buf, buf_size, avctx->frame_number);
109 
110  /* get output buffer */
111  frame->nb_samples = 160;
112  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
113  return ret;
114 
115  dec_mode = (buf[0] >> 3) & 0x000F;
116  packet_size = block_size[dec_mode] + 1;
117 
118  if (packet_size > buf_size) {
119  av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
120  buf_size, packet_size);
121  return AVERROR_INVALIDDATA;
122  }
123 
124  ff_dlog(avctx, "packet_size=%d buf= 0x%"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"\n",
125  packet_size, buf[0], buf[1], buf[2], buf[3]);
126  /* call decoder */
127  Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0);
128 
129  *got_frame_ptr = 1;
130 
131  return packet_size;
132 }
133 
135  .name = "libopencore_amrnb",
136  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
137  .type = AVMEDIA_TYPE_AUDIO,
138  .id = AV_CODEC_ID_AMR_NB,
139  .priv_data_size = sizeof(AMRContext),
140  .init = amr_nb_decode_init,
141  .close = amr_nb_decode_close,
142  .decode = amr_nb_decode_frame,
144 };
145 #endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */
146 
147 #if CONFIG_LIBOPENCORE_AMRNB_ENCODER
148 /* Common code for fixed and float version*/
149 typedef struct AMR_bitrates {
150  int rate;
151  enum Mode mode;
152 } AMR_bitrates;
153 
154 /* Match desired bitrate */
155 static int get_bitrate_mode(int bitrate, void *log_ctx)
156 {
157  /* make the correspondence between bitrate and mode */
158  static const AMR_bitrates rates[] = {
159  { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 },
160  { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 }
161  };
162  int i, best = -1, min_diff = 0;
163  char log_buf[200];
164 
165  for (i = 0; i < 8; i++) {
166  if (rates[i].rate == bitrate)
167  return rates[i].mode;
168  if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) {
169  best = i;
170  min_diff = abs(rates[i].rate - bitrate);
171  }
172  }
173  /* no bitrate matching exactly, log a warning */
174  snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of ");
175  for (i = 0; i < 8; i++)
176  av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f);
177  av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f);
178  av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf);
179 
180  return best;
181 }
182 
183 static const AVOption options[] = {
184  { "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 },
185  { NULL }
186 };
187 
188 static const AVClass amrnb_class = {
189  .class_name = "libopencore_amrnb",
190  .item_name = av_default_item_name,
191  .option = options,
192  .version = LIBAVUTIL_VERSION_INT,
193 };
194 
195 static av_cold int amr_nb_encode_init(AVCodecContext *avctx)
196 {
197  AMRContext *s = avctx->priv_data;
198 
199  if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
200  av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
201  return AVERROR(ENOSYS);
202  }
203 
204  if (avctx->channels != 1) {
205  av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
206  return AVERROR(ENOSYS);
207  }
208 
209  avctx->frame_size = 160;
210  avctx->initial_padding = 50;
211  ff_af_queue_init(avctx, &s->afq);
212 
213  s->enc_state = Encoder_Interface_init(s->enc_dtx);
214  if (!s->enc_state) {
215  av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
216  return -1;
217  }
218 
219  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
220  s->enc_bitrate = avctx->bit_rate;
221 
222  return 0;
223 }
224 
225 static av_cold int amr_nb_encode_close(AVCodecContext *avctx)
226 {
227  AMRContext *s = avctx->priv_data;
228 
229  Encoder_Interface_exit(s->enc_state);
230  ff_af_queue_close(&s->afq);
231  return 0;
232 }
233 
234 static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
235  const AVFrame *frame, int *got_packet_ptr)
236 {
237  AMRContext *s = avctx->priv_data;
238  int written, ret;
239  int16_t *flush_buf = NULL;
240  const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL;
241 
242  if (s->enc_bitrate != avctx->bit_rate) {
243  s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx);
244  s->enc_bitrate = avctx->bit_rate;
245  }
246 
247  if ((ret = ff_alloc_packet(avctx, avpkt, 32)) < 0)
248  return ret;
249 
250  if (frame) {
251  if (frame->nb_samples < avctx->frame_size) {
252  flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
253  if (!flush_buf)
254  return AVERROR(ENOMEM);
255  memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf));
256  samples = flush_buf;
257  if (frame->nb_samples < avctx->frame_size - avctx->initial_padding)
258  s->enc_last_frame = -1;
259  }
260  if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) {
261  av_freep(&flush_buf);
262  return ret;
263  }
264  } else {
265  if (s->enc_last_frame < 0)
266  return 0;
267  flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf));
268  if (!flush_buf)
269  return AVERROR(ENOMEM);
270  samples = flush_buf;
271  s->enc_last_frame = -1;
272  }
273 
274  written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples,
275  avpkt->data, 0);
276  ff_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",
277  written, s->enc_mode, avpkt->data[0]);
278 
279  /* Get the next frame pts/duration */
280  ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
281  &avpkt->duration);
282 
283  avpkt->size = written;
284  *got_packet_ptr = 1;
285  av_freep(&flush_buf);
286  return 0;
287 }
288 
290  .name = "libopencore_amrnb",
291  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"),
292  .type = AVMEDIA_TYPE_AUDIO,
293  .id = AV_CODEC_ID_AMR_NB,
294  .priv_data_size = sizeof(AMRContext),
295  .init = amr_nb_encode_init,
296  .encode2 = amr_nb_encode_frame,
297  .close = amr_nb_encode_close,
299  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
301  .priv_class = &amrnb_class,
302 };
303 #endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */
304 
305 #endif /* CONFIG_LIBOPENCORE_AMRNB */
306 
307 /* -----------AMR wideband ------------*/
308 #if CONFIG_LIBOPENCORE_AMRWB_DECODER
309 
310 #include <opencore-amrwb/dec_if.h>
311 #include <opencore-amrwb/if_rom.h>
312 
313 typedef struct AMRWBContext {
314  void *state;
315 } AMRWBContext;
316 
317 static av_cold int amr_wb_decode_init(AVCodecContext *avctx)
318 {
319  AMRWBContext *s = avctx->priv_data;
320  int ret;
321 
322  if ((ret = amr_decode_fix_avctx(avctx)) < 0)
323  return ret;
324 
325  s->state = D_IF_init();
326 
327  return 0;
328 }
329 
330 static int amr_wb_decode_frame(AVCodecContext *avctx, void *data,
331  int *got_frame_ptr, AVPacket *avpkt)
332 {
333  AVFrame *frame = data;
334  const uint8_t *buf = avpkt->data;
335  int buf_size = avpkt->size;
336  AMRWBContext *s = avctx->priv_data;
337  int mode, ret;
338  int packet_size;
339  static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
340 
341  /* get output buffer */
342  frame->nb_samples = 320;
343  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
344  return ret;
345 
346  mode = (buf[0] >> 3) & 0x000F;
347  packet_size = block_size[mode];
348 
349  if (packet_size > buf_size) {
350  av_log(avctx, AV_LOG_ERROR, "AMR frame too short (%d, should be %d)\n",
351  buf_size, packet_size + 1);
352  return AVERROR_INVALIDDATA;
353  }
354  if (!packet_size) {
355  av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n");
356  return AVERROR_INVALIDDATA;
357  }
358 
359  D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame);
360 
361  *got_frame_ptr = 1;
362 
363  return packet_size;
364 }
365 
366 static int amr_wb_decode_close(AVCodecContext *avctx)
367 {
368  AMRWBContext *s = avctx->priv_data;
369 
370  D_IF_exit(s->state);
371  return 0;
372 }
373 
375  .name = "libopencore_amrwb",
376  .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"),
377  .type = AVMEDIA_TYPE_AUDIO,
378  .id = AV_CODEC_ID_AMR_WB,
379  .priv_data_size = sizeof(AMRWBContext),
380  .init = amr_wb_decode_init,
381  .close = amr_wb_decode_close,
382  .decode = amr_wb_decode_frame,
384  .wrapper_name = "libopencore_amrwb",
385 };
386 
387 #endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */
AVCodecContext::frame_size
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1008
AVCodec
AVCodec.
Definition: codec.h:197
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
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:1039
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:988
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:948
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:373
AVOption
AVOption.
Definition: opt.h:247
encode.h
data
const char data[16]
Definition: mxf.c:143
AV_CODEC_ID_AMR_NB
@ AV_CODEC_ID_AMR_NB
Definition: codec_id.h:405
av_mallocz_array
void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.c:214
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
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:1280
AV_CODEC_ID_AMR_WB
@ AV_CODEC_ID_AMR_WB
Definition: codec_id.h:406
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:1697
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:180
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:277
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:135
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:279
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:389
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:66
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:429
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:1648
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:374
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:996
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:989
i
int i
Definition: input.c:406
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
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:71
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:1276
ff_libopencore_amrnb_encoder
const AVCodec ff_libopencore_amrnb_encoder
AVCodecContext
main external API structure.
Definition: avcodec.h:379
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:224
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:1019
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:406
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:61
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
snprintf
#define snprintf
Definition: snprintf.h:34
ff_alloc_packet
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
Definition: encode.c:34