FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bsf/hevc_mp4toannexb.c
Date: 2026-01-23 14:02:51
Exec Total Coverage
Lines: 88 116 75.9%
Functions: 3 3 100.0%
Branches: 70 98 71.4%
Line Branch Exec Source
1 /*
2 * HEVC MP4 to Annex B byte stream format filter
3 * copyright (c) 2015 Anton Khirnov
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 <string.h>
23
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/mem.h"
26
27 #include "bsf.h"
28 #include "bsf_internal.h"
29 #include "bytestream.h"
30 #include "defs.h"
31
32 #include "hevc/hevc.h"
33
34 #define MIN_HEVCC_LENGTH 23
35
36 typedef struct HEVCBSFContext {
37 uint8_t length_size;
38 int extradata_parsed;
39 } HEVCBSFContext;
40
41 1 static int hevc_extradata_to_annexb(AVBSFContext *ctx)
42 {
43 GetByteContext gb;
44 int length_size, num_arrays, i, j;
45 1 int ret = 0;
46
47 1 uint8_t *new_extradata = NULL;
48 1 size_t new_extradata_size = 0;
49
50 1 bytestream2_init(&gb, ctx->par_in->extradata, ctx->par_in->extradata_size);
51
52 1 bytestream2_skip(&gb, 21);
53 1 length_size = (bytestream2_get_byte(&gb) & 3) + 1;
54 1 num_arrays = bytestream2_get_byte(&gb);
55
56
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 4 for (i = 0; i < num_arrays; i++) {
57 3 int type = bytestream2_get_byte(&gb) & 0x3f;
58 3 int cnt = bytestream2_get_be16(&gb);
59
60
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 3 if (!(type == HEVC_NAL_VPS || type == HEVC_NAL_SPS || type == HEVC_NAL_PPS ||
61 type == HEVC_NAL_SEI_PREFIX || type == HEVC_NAL_SEI_SUFFIX)) {
62 ✗ av_log(ctx, AV_LOG_ERROR, "Invalid NAL unit type in extradata: %d\n",
63 type);
64 ✗ ret = AVERROR_INVALIDDATA;
65 ✗ goto fail;
66 }
67
68
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 6 for (j = 0; j < cnt; j++) {
69 3 const int nalu_len = bytestream2_get_be16(&gb);
70
71
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 6 if (!nalu_len ||
72 3 nalu_len > bytestream2_get_bytes_left(&gb) ||
73
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 3 4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
74 ✗ ret = AVERROR_INVALIDDATA;
75 ✗ goto fail;
76 }
77 3 ret = av_reallocp(&new_extradata, new_extradata_size + nalu_len + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
78
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 3 if (ret < 0)
79 ✗ goto fail;
80
81 3 AV_WB32(new_extradata + new_extradata_size, 1); // add the startcode
82 3 bytestream2_get_buffer(&gb, new_extradata + new_extradata_size + 4, nalu_len);
83 3 new_extradata_size += 4 + nalu_len;
84 3 memset(new_extradata + new_extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
85 }
86 }
87
88 1 av_freep(&ctx->par_out->extradata);
89 1 ctx->par_out->extradata = new_extradata;
90 1 ctx->par_out->extradata_size = new_extradata_size;
91
92
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 1 if (!new_extradata_size)
93 ✗ av_log(ctx, AV_LOG_WARNING, "No parameter sets in the extradata\n");
94
95 1 return length_size;
96 ✗ fail:
97 ✗ av_freep(&new_extradata);
98 ✗ return ret;
99 }
100
101 1 static int hevc_mp4toannexb_init(AVBSFContext *ctx)
102 {
103 1 HEVCBSFContext *s = ctx->priv_data;
104 int ret;
105
106
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 1 if (ctx->par_in->extradata_size < MIN_HEVCC_LENGTH ||
107
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 1 AV_RB24(ctx->par_in->extradata) == 1 ||
108
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 1 AV_RB32(ctx->par_in->extradata) == 1) {
109 ✗ av_log(ctx, AV_LOG_VERBOSE,
110 "The input looks like it is Annex B already\n");
111 } else {
112 1 ret = hevc_extradata_to_annexb(ctx);
113
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 1 if (ret < 0)
114 ✗ return ret;
115 1 s->length_size = ret;
116 1 s->extradata_parsed = 1;
117 }
118
119 1 return 0;
120 }
121
122 97 static int hevc_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
123 {
124 97 HEVCBSFContext *s = ctx->priv_data;
125 AVPacket *in;
126 GetByteContext gb;
127
128 97 int got_irap = 0;
129 97 int got_ps = 0, seen_irap_ps = 0;
130 97 int i, ret = 0;
131
132 97 ret = ff_bsf_get_packet(ctx, &in);
133
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 97 if (ret < 0)
134 49 return ret;
135
136
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 48 if (!s->extradata_parsed) {
137 ✗ av_packet_move_ref(out, in);
138 ✗ av_packet_free(&in);
139 ✗ return 0;
140 }
141
142 48 bytestream2_init(&gb, in->data, in->size);
143
144
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 429 while (!got_irap && bytestream2_get_bytes_left(&gb)) {
145 381 uint32_t nalu_size = 0;
146 int nalu_type;
147
148
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 381 if (bytestream2_get_bytes_left(&gb) < s->length_size) {
149 ✗ ret = AVERROR_INVALIDDATA;
150 ✗ goto fail;
151 }
152
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 1905 for (i = 0; i < s->length_size; i++)
153 1524 nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
154
155
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 381 if (nalu_size < 2 || nalu_size > bytestream2_get_bytes_left(&gb)) {
156 ✗ ret = AVERROR_INVALIDDATA;
157 ✗ goto fail;
158 }
159
160 381 nalu_type = (bytestream2_peek_byte(&gb) >> 1) & 0x3f;
161 381 bytestream2_skip(&gb, nalu_size);
162
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 381 got_irap |= nalu_type >= HEVC_NAL_BLA_W_LP &&
163 nalu_type <= HEVC_NAL_RSV_IRAP_VCL23;
164
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 381 got_ps |= nalu_type >= HEVC_NAL_VPS && nalu_type <= HEVC_NAL_PPS;
165 }
166
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 48 seen_irap_ps = got_irap && got_ps;
167 48 got_irap = got_ps = 0;
168
169 48 bytestream2_init(&gb, in->data, in->size);
170
171
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 430 while (bytestream2_get_bytes_left(&gb)) {
172 382 uint32_t nalu_size = 0;
173 int nalu_type;
174 int is_irap, is_ps, add_extradata, extra_size, prev_size;
175
176
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 382 if (bytestream2_get_bytes_left(&gb) < s->length_size) {
177 ✗ ret = AVERROR_INVALIDDATA;
178 ✗ goto fail;
179 }
180
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 1910 for (i = 0; i < s->length_size; i++)
181 1528 nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
182
183
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 382 if (nalu_size < 2 || nalu_size > bytestream2_get_bytes_left(&gb)) {
184 ✗ ret = AVERROR_INVALIDDATA;
185 ✗ goto fail;
186 }
187
188 382 nalu_type = (bytestream2_peek_byte(&gb) >> 1) & 0x3f;
189
190 /* prepend extradata to IRAP frames */
191
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 382 is_irap = nalu_type >= HEVC_NAL_BLA_W_LP &&
192 nalu_type <= HEVC_NAL_RSV_IRAP_VCL23;
193
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 382 is_ps = nalu_type >= HEVC_NAL_VPS && nalu_type <= HEVC_NAL_PPS && seen_irap_ps;
194
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 382 add_extradata = (is_ps || is_irap) && !got_ps && !got_irap;
195 382 extra_size = add_extradata * ctx->par_out->extradata_size;
196 382 got_irap |= is_irap;
197 382 got_ps |= is_ps;
198
199
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 382 if (FFMIN(INT_MAX, SIZE_MAX) < 4ULL + nalu_size + extra_size) {
200 ✗ ret = AVERROR_INVALIDDATA;
201 ✗ goto fail;
202 }
203
204 382 prev_size = out->size;
205
206 382 ret = av_grow_packet(out, 4 + nalu_size + extra_size);
207
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 382 if (ret < 0)
208 ✗ goto fail;
209
210
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 382 if (extra_size)
211 1 memcpy(out->data + prev_size, ctx->par_out->extradata, extra_size);
212 382 AV_WB32(out->data + prev_size + extra_size, 1);
213 382 bytestream2_get_buffer(&gb, out->data + prev_size + 4 + extra_size, nalu_size);
214 }
215
216 48 ret = av_packet_copy_props(out, in);
217
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 48 if (ret < 0)
218 ✗ goto fail;
219
220 48 fail:
221
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 48 if (ret < 0)
222 ✗ av_packet_unref(out);
223 48 av_packet_free(&in);
224
225 48 return ret;
226 }
227
228 static const enum AVCodecID codec_ids[] = {
229 AV_CODEC_ID_HEVC, AV_CODEC_ID_NONE,
230 };
231
232 const FFBitStreamFilter ff_hevc_mp4toannexb_bsf = {
233 .p.name = "hevc_mp4toannexb",
234 .p.codec_ids = codec_ids,
235 .priv_data_size = sizeof(HEVCBSFContext),
236 .init = hevc_mp4toannexb_init,
237 .filter = hevc_mp4toannexb_filter,
238 };
239