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"
30 #include "libavutil/channel_layout.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 * The codec supports frame threading and has inter-frame dependencies, so it
73 * uses ff_thread_report/await_progress().
74 */
75 #define FF_CODEC_CAP_ALLOCATE_PROGRESS (1 << 6)
76
77 /**
78 * AVCodec.codec_tags termination value
79 */
80 #define FF_CODEC_TAGS_END -1
81
82
83 #ifdef TRACE
84 # define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)
85 #else
86 # define ff_tlog(ctx, ...) do { } while(0)
87 #endif
88
89
90 #define FF_DEFAULT_QUANT_BIAS 999999
91
92 #define FF_QSCALE_TYPE_MPEG1 0
93 #define FF_QSCALE_TYPE_MPEG2 1
94 #define FF_QSCALE_TYPE_H264 2
95 #define FF_QSCALE_TYPE_VP56 3
96
97 #define FF_SANE_NB_CHANNELS 512U
98
99 #define FF_SIGNBIT(x) ((x) >> CHAR_BIT * sizeof(x) - 1)
100
101 #if HAVE_SIMD_ALIGN_64
102 # define STRIDE_ALIGN 64 /* AVX-512 */
103 #elif HAVE_SIMD_ALIGN_32
104 # define STRIDE_ALIGN 32
105 #elif HAVE_SIMD_ALIGN_16
106 # define STRIDE_ALIGN 16
107 #else
108 # define STRIDE_ALIGN 8
109 #endif
110
111 typedef struct DecodeSimpleContext {
112 AVPacket *in_pkt;
113 AVFrame *out_frame;
114 } DecodeSimpleContext;
115
116 typedef struct AVCodecInternal {
117 /**
118 * Whether the parent AVCodecContext is a copy of the context which had
119 * init() called on it.
120 * This is used by multithreading - shared tables and picture pointers
121 * should be freed from the original context only.
122 */
123 int is_copy;
124
125 /**
126 * An audio frame with less than required samples has been submitted and
127 * padded with silence. Reject all subsequent frames.
128 */
129 int last_audio_frame;
130
131 AVFrame *to_free;
132
133 AVBufferRef *pool;
134
135 void *thread_ctx;
136
137 DecodeSimpleContext ds;
138 AVBSFContext *bsf;
139
140 /**
141 * Properties (timestamps+side data) extracted from the last packet passed
142 * for decoding.
143 */
144 AVPacket *last_pkt_props;
145
146 /**
147 * temporary buffer used for encoders to store their bitstream
148 */
149 uint8_t *byte_buffer;
150 unsigned int byte_buffer_size;
151
152 void *frame_thread_encoder;
153
154 /**
155 * Number of audio samples to skip at the start of the next decoded frame
156 */
157 int skip_samples;
158
159 /**
160 * hwaccel-specific private data
161 */
162 void *hwaccel_priv_data;
163
164 /**
165 * checks API usage: after codec draining, flush is required to resume operation
166 */
167 int draining;
168
169 /**
170 * buffers for using new encode/decode API through legacy API
171 */
172 AVPacket *buffer_pkt;
173 int buffer_pkt_valid; // encoding: packet without data can be valid
174 AVFrame *buffer_frame;
175 int draining_done;
176 int compat_decode_warned;
177 /* this variable is set by the decoder internals to signal to the old
178 * API compat wrappers the amount of data consumed from the last packet */
179 size_t compat_decode_consumed;
180 /* when a partial packet has been consumed, this stores the remaining size
181 * of the packet (that should be submitted in the next decode call */
182 size_t compat_decode_partial_size;
183 AVFrame *compat_decode_frame;
184
185 int showed_multi_packet_warning;
186
187 int skip_samples_multiplier;
188
189 /* to prevent infinite loop on errors when draining */
190 int nb_draining_errors;
191
192 /* used when avctx flag AV_CODEC_FLAG_DROPCHANGED is set */
193 int changed_frames_dropped;
194 int initial_format;
195 int initial_width, initial_height;
196 int initial_sample_rate;
197 int initial_channels;
198 uint64_t initial_channel_layout;
199 } AVCodecInternal;
200
201 struct AVCodecDefault {
202 const uint8_t *key;
203 const uint8_t *value;
204 };
205
206 extern const uint8_t ff_log2_run[41];
207
208 /**
209 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
210 * If there is no such matching pair then size is returned.
211 */
212 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
213
214 unsigned int avpriv_toupper4(unsigned int x);
215
216 void ff_color_frame(AVFrame *frame, const int color[4]);
217
218 /**
219 * Maximum size in bytes of extradata.
220 * This value was chosen such that every bit of the buffer is
221 * addressable by a 32-bit signed integer as used by get_bits.
222 */
223 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
224
225 /**
226 * Check AVPacket size and/or allocate data.
227 *
228 * Encoders supporting AVCodec.encode2() can use this as a convenience to
229 * ensure the output packet data is large enough, whether provided by the user
230 * or allocated in this function.
231 *
232 * @param avctx the AVCodecContext of the encoder
233 * @param avpkt the AVPacket
234 * If avpkt->data is already set, avpkt->size is checked
235 * to ensure it is large enough.
236 * If avpkt->data is NULL, a new buffer is allocated.
237 * avpkt->size is set to the specified size.
238 * All other AVPacket fields will be reset with av_init_packet().
239 * @param size the minimum required packet size
240 * @param min_size This is a hint to the allocation algorithm, which indicates
241 * to what minimal size the caller might later shrink the packet
242 * to. Encoders often allocate packets which are larger than the
243 * amount of data that is written into them as the exact amount is
244 * not known at the time of allocation. min_size represents the
245 * size a packet might be shrunk to by the caller. Can be set to
246 * 0. setting this roughly correctly allows the allocation code
247 * to choose between several allocation strategies to improve
248 * speed slightly.
249 * @return non negative on success, negative error code on failure
250 */
251 int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size);
252
253 /**
254 * Rescale from sample rate to AVCodecContext.time_base.
255 */
ff_samples_to_time_base(AVCodecContext * avctx,int64_t samples)256 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
257 int64_t samples)
258 {
259 if(samples == AV_NOPTS_VALUE)
260 return AV_NOPTS_VALUE;
261 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
262 avctx->time_base);
263 }
264
265 /**
266 * 2^(x) for integer x
267 * @return correctly rounded float
268 */
ff_exp2fi(int x)269 static av_always_inline float ff_exp2fi(int x) {
270 /* Normal range */
271 if (-126 <= x && x <= 128)
272 return av_int2float((x+127) << 23);
273 /* Too large */
274 else if (x > 128)
275 return INFINITY;
276 /* Subnormal numbers */
277 else if (x > -150)
278 return av_int2float(1 << (x+149));
279 /* Negligibly small */
280 else
281 return 0;
282 }
283
284 /**
285 * Get a buffer for a frame. This is a wrapper around
286 * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
287 * directly.
288 */
289 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
290
291 #define FF_REGET_BUFFER_FLAG_READONLY 1 ///< the returned buffer does not need to be writable
292 /**
293 * Identical in function to ff_get_buffer(), except it reuses the existing buffer
294 * if available.
295 */
296 int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
297
298 int ff_thread_can_start_frame(AVCodecContext *avctx);
299
300 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
301
302 /**
303 * Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
304 * calling the function and then restoring again. Assumes the mutex is
305 * already locked
306 */
307 int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
308
309 /**
310 * Finalize buf into extradata and set its size appropriately.
311 */
312 int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf);
313
314 const uint8_t *avpriv_find_start_code(const uint8_t *p,
315 const uint8_t *end,
316 uint32_t *state);
317
318 int avpriv_codec_get_cap_skip_frame_fill_param(const AVCodec *codec);
319
320 /**
321 * Check that the provided frame dimensions are valid and set them on the codec
322 * context.
323 */
324 int ff_set_dimensions(AVCodecContext *s, int width, int height);
325
326 /**
327 * Check that the provided sample aspect ratio is valid and set it on the codec
328 * context.
329 */
330 int ff_set_sar(AVCodecContext *avctx, AVRational sar);
331
332 /**
333 * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
334 */
335 int ff_side_data_update_matrix_encoding(AVFrame *frame,
336 enum AVMatrixEncoding matrix_encoding);
337
338 /**
339 * Select the (possibly hardware accelerated) pixel format.
340 * This is a wrapper around AVCodecContext.get_format() and should be used
341 * instead of calling get_format() directly.
342 *
343 * The list of pixel formats must contain at least one valid entry, and is
344 * terminated with AV_PIX_FMT_NONE. If it is possible to decode to software,
345 * the last entry in the list must be the most accurate software format.
346 * If it is not possible to decode to software, AVCodecContext.sw_pix_fmt
347 * must be set before calling this function.
348 */
349 int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
350
351 /**
352 * Set various frame properties from the codec context / packet data.
353 */
354 int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
355
356 /**
357 * Add a CPB properties side data to an encoding context.
358 */
359 AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
360
361 /**
362 * Check AVFrame for A53 side data and allocate and fill SEI message with A53 info
363 *
364 * @param frame Raw frame to get A53 side data from
365 * @param prefix_len Number of bytes to allocate before SEI message
366 * @param data Pointer to a variable to store allocated memory
367 * Upon return the variable will hold NULL on error or if frame has no A53 info.
368 * Otherwise it will point to prefix_len uninitialized bytes followed by
369 * *sei_size SEI message
370 * @param sei_size Pointer to a variable to store generated SEI message length
371 * @return Zero on success, negative error code on failure
372 */
373 int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
374 void **data, size_t *sei_size);
375
376 /**
377 * Get an estimated video bitrate based on frame size, frame rate and coded
378 * bits per pixel.
379 */
380 int64_t ff_guess_coded_bitrate(AVCodecContext *avctx);
381
382 /**
383 * Check if a value is in the list. If not, return the default value
384 *
385 * @param ctx Context for the log msg
386 * @param val_name Name of the checked value, for log msg
387 * @param array_valid_values Array of valid int, ended with INT_MAX
388 * @param default_value Value return if checked value is not in the array
389 * @return Value or default_value.
390 */
391 int ff_int_from_list_or_default(void *ctx, const char * val_name, int val,
392 const int * array_valid_values, int default_value);
393
394 void ff_dvdsub_parse_palette(uint32_t *palette, const char *p);
395
396 #if defined(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avcodec)
397 # define av_export_avcodec __declspec(dllimport)
398 #else
399 # define av_export_avcodec
400 #endif
401
402 #endif /* AVCODEC_INTERNAL_H */
403