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internal.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * common internal api header.
22  */
23 
24 #ifndef AVCODEC_INTERNAL_H
25 #define AVCODEC_INTERNAL_H
26 
27 #include <stdint.h>
28 
29 #include "libavutil/buffer.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/pixfmt.h"
33 #include "avcodec.h"
34 #include "config.h"
35 
36 /**
37  * The codec does not modify any global variables in the init function,
38  * allowing to call the init function without locking any global mutexes.
39  */
40 #define FF_CODEC_CAP_INIT_THREADSAFE (1 << 0)
41 /**
42  * The codec allows calling the close function for deallocation even if
43  * the init function returned a failure. Without this capability flag, a
44  * codec does such cleanup internally when returning failures from the
45  * init function and does not expect the close function to be called at
46  * all.
47  */
48 #define FF_CODEC_CAP_INIT_CLEANUP (1 << 1)
49 /**
50  * Decoders marked with FF_CODEC_CAP_SETS_PKT_DTS want to set
51  * AVFrame.pkt_dts manually. If the flag is set, decode.c won't overwrite
52  * this field. If it's unset, decode.c tries to guess the pkt_dts field
53  * from the input AVPacket.
54  */
55 #define FF_CODEC_CAP_SETS_PKT_DTS (1 << 2)
56 /**
57  * The decoder extracts and fills its parameters even if the frame is
58  * skipped due to the skip_frame setting.
59  */
60 #define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM (1 << 3)
61 /**
62  * The decoder sets the cropping fields in the output frames manually.
63  * If this cap is set, the generic code will initialize output frame
64  * dimensions to coded rather than display values.
65  */
66 #define FF_CODEC_CAP_EXPORTS_CROPPING (1 << 4)
67 /**
68  * Codec initializes slice-based threading with a main function
69  */
70 #define FF_CODEC_CAP_SLICE_THREAD_HAS_MF (1 << 5)
71 
72 #ifdef TRACE
73 # define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)
74 #else
75 # define ff_tlog(ctx, ...) do { } while(0)
76 #endif
77 
78 
79 #define FF_DEFAULT_QUANT_BIAS 999999
80 
81 #define FF_QSCALE_TYPE_MPEG1 0
82 #define FF_QSCALE_TYPE_MPEG2 1
83 #define FF_QSCALE_TYPE_H264 2
84 #define FF_QSCALE_TYPE_VP56 3
85 
86 #define FF_SANE_NB_CHANNELS 64U
87 
88 #define FF_SIGNBIT(x) ((x) >> CHAR_BIT * sizeof(x) - 1)
89 
90 #if HAVE_SIMD_ALIGN_32
91 # define STRIDE_ALIGN 32
92 #elif HAVE_SIMD_ALIGN_16
93 # define STRIDE_ALIGN 16
94 #else
95 # define STRIDE_ALIGN 8
96 #endif
97 
98 typedef struct FramePool {
99  /**
100  * Pools for each data plane. For audio all the planes have the same size,
101  * so only pools[0] is used.
102  */
104 
105  /*
106  * Pool parameters
107  */
108  int format;
109  int width, height;
111  int linesize[4];
112  int planes;
113  int channels;
114  int samples;
115 } FramePool;
116 
117 typedef struct DecodeSimpleContext {
121 
122 typedef struct DecodeFilterContext {
124  int nb_bsfs;
126 
127 typedef struct AVCodecInternal {
128  /**
129  * Whether the parent AVCodecContext is a copy of the context which had
130  * init() called on it.
131  * This is used by multithreading - shared tables and picture pointers
132  * should be freed from the original context only.
133  */
134  int is_copy;
135 
136  /**
137  * Whether to allocate progress for frame threading.
138  *
139  * The codec must set it to 1 if it uses ff_thread_await/report_progress(),
140  * then progress will be allocated in ff_thread_get_buffer(). The frames
141  * then MUST be freed with ff_thread_release_buffer().
142  *
143  * If the codec does not need to call the progress functions (there are no
144  * dependencies between the frames), it should leave this at 0. Then it can
145  * decode straight to the user-provided frames (which the user will then
146  * free with av_frame_unref()), there is no need to call
147  * ff_thread_release_buffer().
148  */
150 
151  /**
152  * An audio frame with less than required samples has been submitted and
153  * padded with silence. Reject all subsequent frames.
154  */
156 
158 
160 
161  void *thread_ctx;
162 
165 
166  /**
167  * Properties (timestamps+side data) extracted from the last packet passed
168  * for decoding.
169  */
171 
172  /**
173  * temporary buffer used for encoders to store their bitstream
174  */
176  unsigned int byte_buffer_size;
177 
179 
180  /**
181  * Number of audio samples to skip at the start of the next decoded frame
182  */
184 
185  /**
186  * hwaccel-specific private data
187  */
189 
190  /**
191  * checks API usage: after codec draining, flush is required to resume operation
192  */
193  int draining;
194 
195  /**
196  * buffers for using new encode/decode API through legacy API
197  */
199  int buffer_pkt_valid; // encoding: packet without data can be valid
202  /* set to 1 when the caller is using the old decoding API */
205  /* this variable is set by the decoder internals to signal to the old
206  * API compat wrappers the amount of data consumed from the last packet */
208  /* when a partial packet has been consumed, this stores the remaining size
209  * of the packet (that should be submitted in the next decode call */
212 
214 
216 
217  /* to prevent infinite loop on errors when draining */
220 
222  const uint8_t *key;
223  const uint8_t *value;
224 };
225 
226 extern const uint8_t ff_log2_run[41];
227 
228 /**
229  * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
230  * If there is no such matching pair then size is returned.
231  */
232 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
233 
234 unsigned int avpriv_toupper4(unsigned int x);
235 
236 /**
237  * does needed setup of pkt_pts/pos and such for (re)get_buffer();
238  */
240 
241 
242 void ff_color_frame(AVFrame *frame, const int color[4]);
243 
244 extern volatile int ff_avcodec_locked;
245 int ff_lock_avcodec(AVCodecContext *log_ctx, const AVCodec *codec);
246 int ff_unlock_avcodec(const AVCodec *codec);
247 
248 int avpriv_lock_avformat(void);
249 int avpriv_unlock_avformat(void);
250 
251 /**
252  * Maximum size in bytes of extradata.
253  * This value was chosen such that every bit of the buffer is
254  * addressable by a 32-bit signed integer as used by get_bits.
255  */
256 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
257 
258 /**
259  * Check AVPacket size and/or allocate data.
260  *
261  * Encoders supporting AVCodec.encode2() can use this as a convenience to
262  * ensure the output packet data is large enough, whether provided by the user
263  * or allocated in this function.
264  *
265  * @param avctx the AVCodecContext of the encoder
266  * @param avpkt the AVPacket
267  * If avpkt->data is already set, avpkt->size is checked
268  * to ensure it is large enough.
269  * If avpkt->data is NULL, a new buffer is allocated.
270  * avpkt->size is set to the specified size.
271  * All other AVPacket fields will be reset with av_init_packet().
272  * @param size the minimum required packet size
273  * @param min_size This is a hint to the allocation algorithm, which indicates
274  * to what minimal size the caller might later shrink the packet
275  * to. Encoders often allocate packets which are larger than the
276  * amount of data that is written into them as the exact amount is
277  * not known at the time of allocation. min_size represents the
278  * size a packet might be shrunk to by the caller. Can be set to
279  * 0. setting this roughly correctly allows the allocation code
280  * to choose between several allocation strategies to improve
281  * speed slightly.
282  * @return non negative on success, negative error code on failure
283  */
284 int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size);
285 
287 
288 /**
289  * Rescale from sample rate to AVCodecContext.time_base.
290  */
292  int64_t samples)
293 {
294  if(samples == AV_NOPTS_VALUE)
295  return AV_NOPTS_VALUE;
296  return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
297  avctx->time_base);
298 }
299 
300 /**
301  * 2^(x) for integer x
302  * @return correctly rounded float
303  */
304 static av_always_inline float ff_exp2fi(int x) {
305  /* Normal range */
306  if (-126 <= x && x <= 128)
307  return av_int2float((x+127) << 23);
308  /* Too large */
309  else if (x > 128)
310  return INFINITY;
311  /* Subnormal numbers */
312  else if (x > -150)
313  return av_int2float(1 << (x+149));
314  /* Negligibly small */
315  else
316  return 0;
317 }
318 
319 /**
320  * Get a buffer for a frame. This is a wrapper around
321  * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
322  * directly.
323  */
324 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
325 
326 /**
327  * Identical in function to av_frame_make_writable(), except it uses
328  * ff_get_buffer() to allocate the buffer when needed.
329  */
331 
333 
335 
336 /**
337  * Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
338  * calling the function and then restoring again. Assumes the mutex is
339  * already locked
340  */
342 
343 /**
344  * Finalize buf into extradata and set its size appropriately.
345  */
346 int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf);
347 
348 const uint8_t *avpriv_find_start_code(const uint8_t *p,
349  const uint8_t *end,
350  uint32_t *state);
351 
353 
354 /**
355  * Check that the provided frame dimensions are valid and set them on the codec
356  * context.
357  */
359 
360 /**
361  * Check that the provided sample aspect ratio is valid and set it on the codec
362  * context.
363  */
364 int ff_set_sar(AVCodecContext *avctx, AVRational sar);
365 
366 /**
367  * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
368  */
370  enum AVMatrixEncoding matrix_encoding);
371 
372 /**
373  * Select the (possibly hardware accelerated) pixel format.
374  * This is a wrapper around AVCodecContext.get_format() and should be used
375  * instead of calling get_format() directly.
376  *
377  * The list of pixel formats must contain at least one valid entry, and is
378  * terminated with AV_PIX_FMT_NONE. If it is possible to decode to software,
379  * the last entry in the list must be the most accurate software format.
380  * If it is not possible to decode to software, AVCodecContext.sw_pix_fmt
381  * must be set before calling this function.
382  */
383 int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
384 
385 /**
386  * Set various frame properties from the codec context / packet data.
387  */
389 
390 /**
391  * Add a CPB properties side data to an encoding context.
392  */
394 
395 int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, int error_count, int pict_type);
396 
397 /**
398  * Check AVFrame for A53 side data and allocate and fill SEI message with A53 info
399  *
400  * @param frame Raw frame to get A53 side data from
401  * @param prefix_len Number of bytes to allocate before SEI message
402  * @param data Pointer to a variable to store allocated memory
403  * Upon return the variable will hold NULL on error or if frame has no A53 info.
404  * Otherwise it will point to prefix_len uninitialized bytes followed by
405  * *sei_size SEI message
406  * @param sei_size Pointer to a variable to store generated SEI message length
407  * @return Zero on success, negative error code on failure
408  */
409 int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
410  void **data, size_t *sei_size);
411 
412 /**
413  * Get an estimated video bitrate based on frame size, frame rate and coded
414  * bits per pixel.
415  */
416 int64_t ff_guess_coded_bitrate(AVCodecContext *avctx);
417 
418 #if defined(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avcodec)
419 # define av_export_avcodec __declspec(dllimport)
420 #else
421 # define av_export_avcodec
422 #endif
423 
424 #endif /* AVCODEC_INTERNAL_H */
int nb_draining_errors
Definition: internal.h:218
int ff_thread_can_start_frame(AVCodecContext *avctx)
const char * s
Definition: avisynth_c.h:768
#define AV_NUM_DATA_POINTERS
Definition: frame.h:202
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int avpriv_unlock_avformat(void)
Definition: utils.c:1995
int stride_align[AV_NUM_DATA_POINTERS]
Definition: internal.h:110
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
const char * fmt
Definition: avisynth_c.h:769
AVPacket * last_pkt_props
Properties (timestamps+side data) extracted from the last packet passed for decoding.
Definition: internal.h:170
AVFrame * to_free
Definition: internal.h:157
int avpriv_codec_get_cap_skip_frame_fill_param(const AVCodec *codec)
Definition: utils.c:575
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:196
int width
Definition: internal.h:109
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition: intfloat.h:40
The bitstream filter state.
Definition: avcodec.h:5583
const char * b
Definition: vf_curves.c:113
int samples
Definition: internal.h:114
AVBufferPool * pools[4]
Pools for each data plane.
Definition: internal.h:103
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3365
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1624
int ff_unlock_avcodec(const AVCodec *codec)
Definition: utils.c:1970
void ff_color_frame(AVFrame *frame, const int color[4])
Definition: utils.c:497
DecodeFilterContext filter
Definition: internal.h:164
int height
Definition: internal.h:109
uint8_t
void * thread_ctx
Definition: internal.h:161
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame)
Set various frame properties from the codec context / packet data.
Definition: decode.c:1762
static struct @281 state
static AVFrame * frame
int planes
Definition: internal.h:112
void * frame_thread_encoder
Definition: internal.h:178
#define height
size_t compat_decode_consumed
Definition: internal.h:207
static int flags
Definition: log.c:57
int ff_set_sar(AVCodecContext *avctx, AVRational sar)
Check that the provided sample aspect ratio is valid and set it on the codec context.
Definition: utils.c:211
ptrdiff_t size
Definition: opengl_enc.c:101
const OptionDef options[]
Definition: ffserver.c:3948
int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf)
Finalize buf into extradata and set its size appropriately.
Definition: utils.c:2094
The buffer pool.
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
FramePool * pool
Definition: internal.h:159
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Call avcodec_open2 recursively by decrementing counter, unlocking mutex, calling the function and the...
Definition: utils.c:602
int is_copy
Whether the parent AVCodecContext is a copy of the context which had init() called on it...
Definition: internal.h:134
AVFrame * buffer_frame
Definition: internal.h:200
uint16_t width
Definition: gdv.c:47
static av_always_inline float ff_exp2fi(int x)
2^(x) for integer x
Definition: internal.h:304
int avpriv_lock_avformat(void)
Definition: utils.c:1986
int64_t ff_guess_coded_bitrate(AVCodecContext *avctx)
Get an estimated video bitrate based on frame size, frame rate and coded bits per pixel...
Definition: utils.c:2406
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: decode.c:1935
audio channel layout utility functions
int channels
Definition: internal.h:113
AVFrame * compat_decode_frame
Definition: internal.h:211
AVPacket * in_pkt
Definition: internal.h:118
DecodeSimpleContext ds
Definition: internal.h:163
static void error(const char *err)
int draining
checks API usage: after codec draining, flush is required to resume operation
Definition: internal.h:193
int linesize[4]
Definition: internal.h:111
int ff_side_data_update_matrix_encoding(AVFrame *frame, enum AVMatrixEncoding matrix_encoding)
Add or update AV_FRAME_DATA_MATRIXENCODING side data.
Definition: utils.c:226
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: decode.c:1288
This structure describes the bitrate properties of an encoded bitstream.
Definition: avcodec.h:1096
Libavcodec external API header.
int compat_decode_warned
Definition: internal.h:204
int sample_rate
samples per second
Definition: avcodec.h:2157
main external API structure.
Definition: avcodec.h:1502
int skip_samples_multiplier
Definition: internal.h:215
volatile int ff_avcodec_locked
Definition: utils.c:118
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1886
void * buf
Definition: avisynth_c.h:690
int ff_init_buffer_info(AVCodecContext *s, AVFrame *frame)
does needed setup of pkt_pts/pos and such for (re)get_buffer();
Definition: decode.c:1654
int showed_multi_packet_warning
Definition: internal.h:213
unsigned int avpriv_toupper4(unsigned int x)
Definition: utils.c:2004
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int buffer_pkt_valid
Definition: internal.h:199
int skip_samples
Number of audio samples to skip at the start of the next decoded frame.
Definition: internal.h:183
refcounted data buffer API
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:32
int allocate_progress
Whether to allocate progress for frame threading.
Definition: internal.h:149
#define attribute_deprecated
Definition: attributes.h:94
const uint8_t * key
Definition: internal.h:222
const uint8_t * value
Definition: internal.h:223
int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, int error_count, int pict_type)
Definition: avpacket.c:669
AVPacket * buffer_pkt
buffers for using new encode/decode API through legacy API
Definition: internal.h:198
int ff_lock_avcodec(AVCodecContext *log_ctx, const AVCodec *codec)
Definition: utils.c:1944
int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx)
Definition: h264dec.c:60
void * hwaccel_priv_data
hwaccel-specific private data
Definition: internal.h:188
AVCPBProperties * ff_add_cpb_side_data(AVCodecContext *avctx)
Add a CPB properties side data to an encoding context.
Definition: utils.c:2164
AVBSFContext ** bsfs
Definition: internal.h:123
pixel format definitions
attribute_deprecated int ff_alloc_packet(AVPacket *avpkt, int size)
Definition: encode.c:73
static const struct twinvq_data tab
unsigned int byte_buffer_size
Definition: internal.h:176
int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len, void **data, size_t *sei_size)
Check AVFrame for A53 side data and allocate and fill SEI message with A53 info.
Definition: utils.c:2363
size_t compat_decode_partial_size
Definition: internal.h:210
#define av_always_inline
Definition: attributes.h:39
const uint8_t ff_log2_run[41]
Definition: bitstream.c:39
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
Definition: internal.h:291
AVMatrixEncoding
int format
Definition: internal.h:108
#define INFINITY
Definition: mathematics.h:67
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1391
uint8_t * byte_buffer
temporary buffer used for encoders to store their bitstream
Definition: internal.h:175
int ff_match_2uint16(const uint16_t(*tab)[2], int size, int a, int b)
Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
Definition: utils.c:1883
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AVFrame * out_frame
Definition: internal.h:119
int last_audio_frame
An audio frame with less than required samples has been submitted and padded with silence...
Definition: internal.h:155