FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/internal.h
Date: 2022-07-06 18:02:43
Exec Total Coverage
Lines: 6 12 50.0%
Branches: 3 10 30.0%

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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"
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 #define FF_SANE_NB_CHANNELS 512U
37
38 #if HAVE_SIMD_ALIGN_64
39 # define STRIDE_ALIGN 64 /* AVX-512 */
40 #elif HAVE_SIMD_ALIGN_32
41 # define STRIDE_ALIGN 32
42 #elif HAVE_SIMD_ALIGN_16
43 # define STRIDE_ALIGN 16
44 #else
45 # define STRIDE_ALIGN 8
46 #endif
47
48 typedef struct AVCodecInternal {
49 /**
50 * When using frame-threaded decoding, this field is set for the first
51 * worker thread (e.g. to decode extradata just once).
52 */
53 int is_copy;
54
55 /**
56 * An audio frame with less than required samples has been submitted and
57 * padded with silence. Reject all subsequent frames.
58 */
59 int last_audio_frame;
60
61 AVBufferRef *pool;
62
63 void *thread_ctx;
64
65 /**
66 * This packet is used to hold the packet given to decoders
67 * implementing the .decode API; it is unused by the generic
68 * code for decoders implementing the .receive_frame API and
69 * may be freely used (but not freed) by them with the caveat
70 * that the packet will be unreferenced generically in
71 * avcodec_flush_buffers().
72 */
73 AVPacket *in_pkt;
74 struct AVBSFContext *bsf;
75
76 /**
77 * Properties (timestamps+side data) extracted from the last packet passed
78 * for decoding.
79 */
80 AVPacket *last_pkt_props;
81 struct AVFifo *pkt_props;
82
83 /**
84 * temporary buffer used for encoders to store their bitstream
85 */
86 uint8_t *byte_buffer;
87 unsigned int byte_buffer_size;
88
89 /**
90 * This is set to AV_PKT_FLAG_KEY for encoders that encode intra-only
91 * formats (i.e. whose codec descriptor has AV_CODEC_PROP_INTRA_ONLY set).
92 * This is used to set said flag generically for said encoders.
93 */
94 int intra_only_flag;
95
96 void *frame_thread_encoder;
97
98 /**
99 * The input frame is stored here for encoders implementing the simple
100 * encode API.
101 *
102 * Not allocated in other cases.
103 */
104 AVFrame *in_frame;
105
106 /**
107 * If this is set, then FFCodec->close (if existing) needs to be called
108 * for the parent AVCodecContext.
109 */
110 int needs_close;
111
112 /**
113 * Number of audio samples to skip at the start of the next decoded frame
114 */
115 int skip_samples;
116
117 /**
118 * hwaccel-specific private data
119 */
120 void *hwaccel_priv_data;
121
122 /**
123 * checks API usage: after codec draining, flush is required to resume operation
124 */
125 int draining;
126
127 /**
128 * buffers for using new encode/decode API through legacy API
129 */
130 AVPacket *buffer_pkt;
131 AVFrame *buffer_frame;
132 int draining_done;
133
134 int showed_multi_packet_warning;
135
136 int skip_samples_multiplier;
137
138 /* to prevent infinite loop on errors when draining */
139 int nb_draining_errors;
140
141 /* used when avctx flag AV_CODEC_FLAG_DROPCHANGED is set */
142 int changed_frames_dropped;
143 int initial_format;
144 int initial_width, initial_height;
145 int initial_sample_rate;
146 #if FF_API_OLD_CHANNEL_LAYOUT
147 int initial_channels;
148 uint64_t initial_channel_layout;
149 #endif
150 AVChannelLayout initial_ch_layout;
151 } AVCodecInternal;
152
153 /**
154 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
155 * If there is no such matching pair then size is returned.
156 */
157 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
158
159 unsigned int ff_toupper4(unsigned int x);
160
161 void ff_color_frame(AVFrame *frame, const int color[4]);
162
163 /**
164 * Maximum size in bytes of extradata.
165 * This value was chosen such that every bit of the buffer is
166 * addressable by a 32-bit signed integer as used by get_bits.
167 */
168 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
169
170 /**
171 * Rescale from sample rate to AVCodecContext.time_base.
172 */
173 303785 static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
174 int64_t samples)
175 {
176
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303785 if(samples == AV_NOPTS_VALUE)
177 return AV_NOPTS_VALUE;
178 303785 return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
179 avctx->time_base);
180 }
181
182 /**
183 * 2^(x) for integer x
184 * @return correctly rounded float
185 */
186 179564 static av_always_inline float ff_exp2fi(int x) {
187 /* Normal range */
188
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179564 if (-126 <= x && x <= 128)
189 179564 return av_int2float((x+127) << 23);
190 /* Too large */
191 else if (x > 128)
192 return INFINITY;
193 /* Subnormal numbers */
194 else if (x > -150)
195 return av_int2float(1 << (x+149));
196 /* Negligibly small */
197 else
198 return 0;
199 }
200
201 /**
202 * Get a buffer for a frame. This is a wrapper around
203 * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
204 * directly.
205 */
206 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
207
208 #define FF_REGET_BUFFER_FLAG_READONLY 1 ///< the returned buffer does not need to be writable
209 /**
210 * Identical in function to ff_get_buffer(), except it reuses the existing buffer
211 * if available.
212 */
213 int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
214
215 int ff_thread_can_start_frame(AVCodecContext *avctx);
216
217 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
218
219 int avpriv_codec_get_cap_skip_frame_fill_param(const AVCodec *codec);
220
221 /**
222 * Check that the provided frame dimensions are valid and set them on the codec
223 * context.
224 */
225 int ff_set_dimensions(AVCodecContext *s, int width, int height);
226
227 /**
228 * Check that the provided sample aspect ratio is valid and set it on the codec
229 * context.
230 */
231 int ff_set_sar(AVCodecContext *avctx, AVRational sar);
232
233 /**
234 * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
235 */
236 int ff_side_data_update_matrix_encoding(AVFrame *frame,
237 enum AVMatrixEncoding matrix_encoding);
238
239 /**
240 * Select the (possibly hardware accelerated) pixel format.
241 * This is a wrapper around AVCodecContext.get_format() and should be used
242 * instead of calling get_format() directly.
243 *
244 * The list of pixel formats must contain at least one valid entry, and is
245 * terminated with AV_PIX_FMT_NONE. If it is possible to decode to software,
246 * the last entry in the list must be the most accurate software format.
247 * If it is not possible to decode to software, AVCodecContext.sw_pix_fmt
248 * must be set before calling this function.
249 */
250 int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
251
252 /**
253 * Add a CPB properties side data to an encoding context.
254 */
255 AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
256
257 /**
258 * Check AVFrame for S12M timecode side data and allocate and fill TC SEI message with timecode info
259 *
260 * @param frame Raw frame to get S12M timecode side data from
261 * @param rate The frame rate
262 * @param prefix_len Number of bytes to allocate before SEI message
263 * @param data Pointer to a variable to store allocated memory
264 * Upon return the variable will hold NULL on error or if frame has no S12M timecode info.
265 * Otherwise it will point to prefix_len uninitialized bytes followed by
266 * *sei_size SEI message
267 * @param sei_size Pointer to a variable to store generated SEI message length
268 * @return Zero on success, negative error code on failure
269 */
270 int ff_alloc_timecode_sei(const AVFrame *frame, AVRational rate, size_t prefix_len,
271 void **data, size_t *sei_size);
272
273 /**
274 * Get an estimated video bitrate based on frame size, frame rate and coded
275 * bits per pixel.
276 */
277 int64_t ff_guess_coded_bitrate(AVCodecContext *avctx);
278
279 /**
280 * Check if a value is in the list. If not, return the default value
281 *
282 * @param ctx Context for the log msg
283 * @param val_name Name of the checked value, for log msg
284 * @param array_valid_values Array of valid int, ended with INT_MAX
285 * @param default_value Value return if checked value is not in the array
286 * @return Value or default_value.
287 */
288 int ff_int_from_list_or_default(void *ctx, const char * val_name, int val,
289 const int * array_valid_values, int default_value);
290
291 void ff_dvdsub_parse_palette(uint32_t *palette, const char *p);
292
293 #endif /* AVCODEC_INTERNAL_H */
294