FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/avc.c
Date: 2026-04-23 02:20:26
Exec Total Coverage
Lines: 118 195 60.5%
Functions: 3 5 60.0%
Branches: 46 136 33.8%
Line Branch Exec Source
1 /*
2 * AVC helper functions for muxers
3 * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
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 "libavutil/intreadwrite.h"
23 #include "libavutil/mem.h"
24 #include "libavcodec/h264.h"
25 #include "libavcodec/get_bits.h"
26 #include "avio.h"
27 #include "avc.h"
28 #include "avio_internal.h"
29 #include "nal.h"
30
31 62 int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
32 {
33 62 AVIOContext *sps_pb = NULL, *pps_pb = NULL, *sps_ext_pb = NULL;
34 uint8_t *buf, *end, *start;
35 uint8_t *sps, *pps, *sps_ext;
36 62 uint32_t sps_size = 0, pps_size = 0, sps_ext_size = 0;
37 62 int ret, nb_sps = 0, nb_pps = 0, nb_sps_ext = 0;
38
39
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 62 if (len <= 6)
40 ✗ return AVERROR_INVALIDDATA;
41
42 /* check for H.264 start code */
43
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 62 if (AV_RB32(data) != 0x00000001 &&
44
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 58 AV_RB24(data) != 0x000001) {
45 58 avio_write(pb, data, len);
46 58 return 0;
47 }
48
49 4 ret = ff_nal_parse_units_buf(data, &buf, &len);
50
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 4 if (ret < 0)
51 ✗ return ret;
52 4 start = buf;
53 4 end = buf + len;
54
55 4 ret = avio_open_dyn_buf(&sps_pb);
56
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 4 if (ret < 0)
57 ✗ goto fail;
58 4 ret = avio_open_dyn_buf(&pps_pb);
59
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 4 if (ret < 0)
60 ✗ goto fail;
61 4 ret = avio_open_dyn_buf(&sps_ext_pb);
62
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 4 if (ret < 0)
63 ✗ goto fail;
64
65 /* look for sps and pps */
66
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 12 while (end - buf > 4) {
67 uint32_t size;
68 uint8_t nal_type;
69
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 8 size = FFMIN(AV_RB32(buf), end - buf - 4);
70 8 buf += 4;
71 8 nal_type = buf[0] & 0x1f;
72
73
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 8 if (nal_type == 7) { /* SPS */
74 4 nb_sps++;
75
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 4 if (size > UINT16_MAX || nb_sps >= H264_MAX_SPS_COUNT) {
76 ✗ ret = AVERROR_INVALIDDATA;
77 ✗ goto fail;
78 }
79 4 avio_wb16(sps_pb, size);
80 4 avio_write(sps_pb, buf, size);
81
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 4 } else if (nal_type == 8) { /* PPS */
82 4 nb_pps++;
83
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 4 if (size > UINT16_MAX || nb_pps >= H264_MAX_PPS_COUNT) {
84 ✗ ret = AVERROR_INVALIDDATA;
85 ✗ goto fail;
86 }
87 4 avio_wb16(pps_pb, size);
88 4 avio_write(pps_pb, buf, size);
89 ✗ } else if (nal_type == 13) { /* SPS_EXT */
90 ✗ nb_sps_ext++;
91 ✗ if (size > UINT16_MAX || nb_sps_ext >= 256) {
92 ✗ ret = AVERROR_INVALIDDATA;
93 ✗ goto fail;
94 }
95 ✗ avio_wb16(sps_ext_pb, size);
96 ✗ avio_write(sps_ext_pb, buf, size);
97 }
98
99 8 buf += size;
100 }
101 4 sps_size = avio_get_dyn_buf(sps_pb, &sps);
102 4 pps_size = avio_get_dyn_buf(pps_pb, &pps);
103 4 sps_ext_size = avio_get_dyn_buf(sps_ext_pb, &sps_ext);
104
105
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 4 if (sps_size < 6 || !pps_size) {
106 ✗ ret = AVERROR_INVALIDDATA;
107 ✗ goto fail;
108 }
109
110 4 avio_w8(pb, 1); /* version */
111 4 avio_w8(pb, sps[3]); /* profile */
112 4 avio_w8(pb, sps[4]); /* profile compat */
113 4 avio_w8(pb, sps[5]); /* level */
114 4 avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
115 4 avio_w8(pb, 0xe0 | nb_sps); /* 3 bits reserved (111) + 5 bits number of sps */
116
117 4 avio_write(pb, sps, sps_size);
118 4 avio_w8(pb, nb_pps); /* number of pps */
119 4 avio_write(pb, pps, pps_size);
120
121
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 4 if (sps[3] != 66 && sps[3] != 77 && sps[3] != 88) {
122 H264SPS seq;
123 3 ret = ff_avc_decode_sps(&seq, sps + 3, sps_size - 3);
124
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 3 if (ret < 0)
125 ✗ goto fail;
126
127 3 avio_w8(pb, 0xfc | seq.chroma_format_idc); /* 6 bits reserved (111111) + chroma_format_idc */
128 3 avio_w8(pb, 0xf8 | (seq.bit_depth_luma - 8)); /* 5 bits reserved (11111) + bit_depth_luma_minus8 */
129 3 avio_w8(pb, 0xf8 | (seq.bit_depth_chroma - 8)); /* 5 bits reserved (11111) + bit_depth_chroma_minus8 */
130 3 avio_w8(pb, nb_sps_ext); /* number of sps ext */
131
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 3 if (nb_sps_ext)
132 ✗ avio_write(pb, sps_ext, sps_ext_size);
133 }
134
135 1 fail:
136 4 ffio_free_dyn_buf(&sps_pb);
137 4 ffio_free_dyn_buf(&pps_pb);
138 4 ffio_free_dyn_buf(&sps_ext_pb);
139 4 av_free(start);
140
141 4 return ret;
142 }
143
144 ✗ int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
145 {
146 uint16_t sps_size, pps_size;
147 uint8_t *out;
148 int out_size;
149
150 ✗ *buf = NULL;
151 ✗ if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001))
152 ✗ return 0;
153 ✗ if (*size < 11 || in[0] != 1)
154 ✗ return AVERROR_INVALIDDATA;
155
156 ✗ sps_size = AV_RB16(&in[6]);
157 ✗ if (11 + sps_size > *size)
158 ✗ return AVERROR_INVALIDDATA;
159 ✗ pps_size = AV_RB16(&in[9 + sps_size]);
160 ✗ if (11 + sps_size + pps_size > *size)
161 ✗ return AVERROR_INVALIDDATA;
162 ✗ out_size = 8 + sps_size + pps_size;
163 ✗ out = av_mallocz(out_size + AV_INPUT_BUFFER_PADDING_SIZE);
164 ✗ if (!out)
165 ✗ return AVERROR(ENOMEM);
166 ✗ AV_WB32(&out[0], 0x00000001);
167 ✗ memcpy(out + 4, &in[8], sps_size);
168 ✗ AV_WB32(&out[4 + sps_size], 0x00000001);
169 ✗ memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size);
170 ✗ *buf = out;
171 ✗ *size = out_size;
172 ✗ return 0;
173 }
174
175 static const AVRational avc_sample_aspect_ratio[17] = {
176 { 0, 1 },
177 { 1, 1 },
178 { 12, 11 },
179 { 10, 11 },
180 { 16, 11 },
181 { 40, 33 },
182 { 24, 11 },
183 { 20, 11 },
184 { 32, 11 },
185 { 80, 33 },
186 { 18, 11 },
187 { 15, 11 },
188 { 64, 33 },
189 { 160, 99 },
190 { 4, 3 },
191 { 3, 2 },
192 { 2, 1 },
193 };
194
195 38 static inline int get_ue_golomb(GetBitContext *gb) {
196 int i;
197
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 87 for (i = 0; i < 32 && !get_bits1(gb); i++)
198 ;
199 38 return get_bitsz(gb, i) + (1 << i) - 1;
200 }
201
202 ✗ static inline int get_se_golomb(GetBitContext *gb) {
203 ✗ int v = get_ue_golomb(gb) + 1;
204 ✗ int sign = -(v & 1);
205 ✗ return ((v >> 1) ^ sign) - sign;
206 }
207
208 3 int ff_avc_decode_sps(H264SPS *sps, const uint8_t *buf, int buf_size)
209 {
210 int i, j, ret, rbsp_size, aspect_ratio_idc, pic_order_cnt_type;
211 int num_ref_frames_in_pic_order_cnt_cycle;
212 3 int delta_scale, lastScale = 8, nextScale = 8;
213 int sizeOfScalingList;
214 GetBitContext gb;
215 uint8_t *rbsp_buf;
216
217 3 rbsp_buf = ff_nal_unit_extract_rbsp(buf, buf_size, &rbsp_size, 0);
218
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 3 if (!rbsp_buf)
219 ✗ return AVERROR(ENOMEM);
220
221 3 ret = init_get_bits8(&gb, rbsp_buf, rbsp_size);
222
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 3 if (ret < 0)
223 ✗ goto end;
224
225 3 memset(sps, 0, sizeof(*sps));
226
227 3 sps->profile_idc = get_bits(&gb, 8);
228 3 sps->constraint_set_flags |= get_bits1(&gb) << 0; // constraint_set0_flag
229 3 sps->constraint_set_flags |= get_bits1(&gb) << 1; // constraint_set1_flag
230 3 sps->constraint_set_flags |= get_bits1(&gb) << 2; // constraint_set2_flag
231 3 sps->constraint_set_flags |= get_bits1(&gb) << 3; // constraint_set3_flag
232 3 sps->constraint_set_flags |= get_bits1(&gb) << 4; // constraint_set4_flag
233 3 sps->constraint_set_flags |= get_bits1(&gb) << 5; // constraint_set5_flag
234 3 skip_bits(&gb, 2); // reserved_zero_2bits
235 3 sps->level_idc = get_bits(&gb, 8);
236 3 sps->id = get_ue_golomb(&gb);
237
238
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 3 if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
239 ✗ sps->profile_idc == 122 || sps->profile_idc == 244 || sps->profile_idc == 44 ||
240 ✗ sps->profile_idc == 83 || sps->profile_idc == 86 || sps->profile_idc == 118 ||
241 ✗ sps->profile_idc == 128 || sps->profile_idc == 138 || sps->profile_idc == 139 ||
242 ✗ sps->profile_idc == 134) {
243 3 sps->chroma_format_idc = get_ue_golomb(&gb); // chroma_format_idc
244
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 3 if (sps->chroma_format_idc == 3) {
245 ✗ skip_bits1(&gb); // separate_colour_plane_flag
246 }
247 3 sps->bit_depth_luma = get_ue_golomb(&gb) + 8;
248 3 sps->bit_depth_chroma = get_ue_golomb(&gb) + 8;
249 3 skip_bits1(&gb); // qpprime_y_zero_transform_bypass_flag
250
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 3 if (get_bits1(&gb)) { // seq_scaling_matrix_present_flag
251 ✗ for (i = 0; i < ((sps->chroma_format_idc != 3) ? 8 : 12); i++) {
252 ✗ if (!get_bits1(&gb)) // seq_scaling_list_present_flag
253 ✗ continue;
254 ✗ lastScale = 8;
255 ✗ nextScale = 8;
256 ✗ sizeOfScalingList = i < 6 ? 16 : 64;
257 ✗ for (j = 0; j < sizeOfScalingList; j++) {
258 ✗ if (nextScale != 0) {
259 ✗ delta_scale = get_se_golomb(&gb);
260 ✗ nextScale = (lastScale + delta_scale) & 0xff;
261 }
262 ✗ lastScale = nextScale == 0 ? lastScale : nextScale;
263 }
264 }
265 }
266 } else {
267 ✗ sps->chroma_format_idc = 1;
268 ✗ sps->bit_depth_luma = 8;
269 ✗ sps->bit_depth_chroma = 8;
270 }
271
272 3 get_ue_golomb(&gb); // log2_max_frame_num_minus4
273 3 pic_order_cnt_type = get_ue_golomb(&gb);
274
275
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 3 if (pic_order_cnt_type == 0) {
276 3 get_ue_golomb(&gb); // log2_max_pic_order_cnt_lsb_minus4
277 ✗ } else if (pic_order_cnt_type == 1) {
278 ✗ skip_bits1(&gb); // delta_pic_order_always_zero
279 ✗ get_se_golomb(&gb); // offset_for_non_ref_pic
280 ✗ get_se_golomb(&gb); // offset_for_top_to_bottom_field
281 ✗ num_ref_frames_in_pic_order_cnt_cycle = get_ue_golomb(&gb);
282 ✗ for (i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++)
283 ✗ get_se_golomb(&gb); // offset_for_ref_frame
284 }
285
286 3 get_ue_golomb(&gb); // max_num_ref_frames
287 3 skip_bits1(&gb); // gaps_in_frame_num_value_allowed_flag
288 3 get_ue_golomb(&gb); // pic_width_in_mbs_minus1
289 3 get_ue_golomb(&gb); // pic_height_in_map_units_minus1
290
291 3 sps->frame_mbs_only_flag = get_bits1(&gb);
292
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 3 if (!sps->frame_mbs_only_flag)
293 2 skip_bits1(&gb); // mb_adaptive_frame_field_flag
294
295 3 skip_bits1(&gb); // direct_8x8_inference_flag
296
297
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 3 if (get_bits1(&gb)) { // frame_cropping_flag
298 2 get_ue_golomb(&gb); // frame_crop_left_offset
299 2 get_ue_golomb(&gb); // frame_crop_right_offset
300 2 get_ue_golomb(&gb); // frame_crop_top_offset
301 2 get_ue_golomb(&gb); // frame_crop_bottom_offset
302 }
303
304
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 3 if (get_bits1(&gb)) { // vui_parameters_present_flag
305
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 3 if (get_bits1(&gb)) { // aspect_ratio_info_present_flag
306 2 aspect_ratio_idc = get_bits(&gb, 8);
307
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 2 if (aspect_ratio_idc == 0xff) {
308 ✗ sps->sar.num = get_bits(&gb, 16);
309 ✗ sps->sar.den = get_bits(&gb, 16);
310
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 2 } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(avc_sample_aspect_ratio)) {
311 2 sps->sar = avc_sample_aspect_ratio[aspect_ratio_idc];
312 }
313 }
314 }
315
316
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 3 if (!sps->sar.den) {
317 1 sps->sar.num = 1;
318 1 sps->sar.den = 1;
319 }
320
321 3 ret = 0;
322 3 end:
323 3 av_free(rbsp_buf);
324 3 return ret;
325 }
326