FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/internal.h
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 3 8 37.5%
Branches: 2 8 25.0%

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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 #if CONFIG_LCMS2
37 # include "fflcms2.h"
38 #endif
39
40 #define FF_SANE_NB_CHANNELS 512U
41
42 #if HAVE_SIMD_ALIGN_64
43 # define STRIDE_ALIGN 64 /* AVX-512 */
44 #elif HAVE_SIMD_ALIGN_32
45 # define STRIDE_ALIGN 32
46 #elif HAVE_SIMD_ALIGN_16
47 # define STRIDE_ALIGN 16
48 #else
49 # define STRIDE_ALIGN 8
50 #endif
51
52 typedef struct AVCodecInternal {
53 /**
54 * When using frame-threaded decoding, this field is set for the first
55 * worker thread (e.g. to decode extradata just once).
56 */
57 int is_copy;
58
59 /**
60 * An audio frame with less than required samples has been submitted (and
61 * potentially padded with silence). Reject all subsequent frames.
62 */
63 int last_audio_frame;
64
65 /**
66 * Audio encoders can set this flag during init to indicate that they
67 * want the small last frame to be padded to a multiple of pad_samples.
68 */
69 int pad_samples;
70
71 AVBufferRef *pool;
72
73 void *thread_ctx;
74
75 /**
76 * This packet is used to hold the packet given to decoders
77 * implementing the .decode API; it is unused by the generic
78 * code for decoders implementing the .receive_frame API and
79 * may be freely used (but not freed) by them with the caveat
80 * that the packet will be unreferenced generically in
81 * avcodec_flush_buffers().
82 */
83 AVPacket *in_pkt;
84 struct AVBSFContext *bsf;
85
86 /**
87 * Properties (timestamps+side data) extracted from the last packet passed
88 * for decoding.
89 */
90 AVPacket *last_pkt_props;
91 struct AVFifo *pkt_props;
92
93 /**
94 * temporary buffer used for encoders to store their bitstream
95 */
96 uint8_t *byte_buffer;
97 unsigned int byte_buffer_size;
98
99 /**
100 * This is set to AV_PKT_FLAG_KEY for encoders that encode intra-only
101 * formats (i.e. whose codec descriptor has AV_CODEC_PROP_INTRA_ONLY set).
102 * This is used to set said flag generically for said encoders.
103 */
104 int intra_only_flag;
105
106 void *frame_thread_encoder;
107
108 /**
109 * The input frame is stored here for encoders implementing the simple
110 * encode API.
111 *
112 * Not allocated in other cases.
113 */
114 AVFrame *in_frame;
115
116 /**
117 * When the AV_CODEC_FLAG_RECON_FRAME flag is used. the encoder should store
118 * here the reconstructed frame corresponding to the last returned packet.
119 *
120 * Not allocated in other cases.
121 */
122 AVFrame *recon_frame;
123
124 /**
125 * If this is set, then FFCodec->close (if existing) needs to be called
126 * for the parent AVCodecContext.
127 */
128 int needs_close;
129
130 /**
131 * Number of audio samples to skip at the start of the next decoded frame
132 */
133 int skip_samples;
134
135 /**
136 * hwaccel-specific private data
137 */
138 void *hwaccel_priv_data;
139
140 /**
141 * checks API usage: after codec draining, flush is required to resume operation
142 */
143 int draining;
144
145 /**
146 * Temporary buffers for newly received or not yet output packets/frames.
147 */
148 AVPacket *buffer_pkt;
149 AVFrame *buffer_frame;
150 int draining_done;
151
152 int showed_multi_packet_warning;
153
154 /* to prevent infinite loop on errors when draining */
155 int nb_draining_errors;
156
157 /* used when avctx flag AV_CODEC_FLAG_DROPCHANGED is set */
158 int changed_frames_dropped;
159 int initial_format;
160 int initial_width, initial_height;
161 int initial_sample_rate;
162 AVChannelLayout initial_ch_layout;
163
164 #if CONFIG_LCMS2
165 FFIccContext icc; /* used to read and write embedded ICC profiles */
166 #endif
167 } AVCodecInternal;
168
169 /**
170 * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
171 * If there is no such matching pair then size is returned.
172 */
173 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
174
175 unsigned int ff_toupper4(unsigned int x);
176
177 void ff_color_frame(AVFrame *frame, const int color[4]);
178
179 /**
180 * Maximum size in bytes of extradata.
181 * This value was chosen such that every bit of the buffer is
182 * addressable by a 32-bit signed integer as used by get_bits.
183 */
184 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
185
186 /**
187 * 2^(x) for integer x
188 * @return correctly rounded float
189 */
190 178647 static av_always_inline float ff_exp2fi(int x) {
191 /* Normal range */
192
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178647 if (-126 <= x && x <= 128)
193 178647 return av_int2float((x+127) << 23);
194 /* Too large */
195 else if (x > 128)
196 return INFINITY;
197 /* Subnormal numbers */
198 else if (x > -150)
199 return av_int2float(1 << (x+149));
200 /* Negligibly small */
201 else
202 return 0;
203 }
204
205 int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
206
207 int avpriv_codec_get_cap_skip_frame_fill_param(const AVCodec *codec);
208
209 /**
210 * Add a CPB properties side data to an encoding context.
211 */
212 AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
213
214 /**
215 * Check AVFrame for S12M timecode side data and allocate and fill TC SEI message with timecode info
216 *
217 * @param frame Raw frame to get S12M timecode side data from
218 * @param rate The frame rate
219 * @param prefix_len Number of bytes to allocate before SEI message
220 * @param data Pointer to a variable to store allocated memory
221 * Upon return the variable will hold NULL on error or if frame has no S12M timecode info.
222 * Otherwise it will point to prefix_len uninitialized bytes followed by
223 * *sei_size SEI message
224 * @param sei_size Pointer to a variable to store generated SEI message length
225 * @return Zero on success, negative error code on failure
226 */
227 int ff_alloc_timecode_sei(const AVFrame *frame, AVRational rate, size_t prefix_len,
228 void **data, size_t *sei_size);
229
230 /**
231 * Get an estimated video bitrate based on frame size, frame rate and coded
232 * bits per pixel.
233 */
234 int64_t ff_guess_coded_bitrate(AVCodecContext *avctx);
235
236 /**
237 * Check if a value is in the list. If not, return the default value
238 *
239 * @param ctx Context for the log msg
240 * @param val_name Name of the checked value, for log msg
241 * @param array_valid_values Array of valid int, ended with INT_MAX
242 * @param default_value Value return if checked value is not in the array
243 * @return Value or default_value.
244 */
245 int ff_int_from_list_or_default(void *ctx, const char * val_name, int val,
246 const int * array_valid_values, int default_value);
247
248 #endif /* AVCODEC_INTERNAL_H */
249