h264_mp3toannexb_bsg: don't crash, but warn, if PPS/SPS not found.
[libav.git] / libavcodec / h264_mp4toannexb_bsf.c
CommitLineData
bdfae2a5 1/*
ec21c215 2 * H.264 MP4 to Annex B byte stream format filter
074bfa7d 3 * Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
bdfae2a5
BF
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
6a5d31ac 22#include "libavutil/intreadwrite.h"
bdfae2a5
BF
23#include "avcodec.h"
24
25typedef struct H264BSFContext {
26 uint8_t length_size;
27 uint8_t first_idr;
d5cc1ed7 28 int extradata_parsed;
bdfae2a5
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29} H264BSFContext;
30
639c697c 31static int alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size,
bb5cfc48
BF
32 const uint8_t *sps_pps, uint32_t sps_pps_size,
33 const uint8_t *in, uint32_t in_size) {
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34 uint32_t offset = *poutbuf_size;
35 uint8_t nal_header_size = offset ? 3 : 4;
639c697c 36 void *tmp;
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37
38 *poutbuf_size += sps_pps_size+in_size+nal_header_size;
639c697c
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39 tmp = av_realloc(*poutbuf, *poutbuf_size);
40 if (!tmp)
41 return AVERROR(ENOMEM);
42 *poutbuf = tmp;
bdfae2a5
BF
43 if (sps_pps)
44 memcpy(*poutbuf+offset, sps_pps, sps_pps_size);
45 memcpy(*poutbuf+sps_pps_size+nal_header_size+offset, in, in_size);
1f7d2f54 46 if (!offset) {
bdfae2a5 47 AV_WB32(*poutbuf+sps_pps_size, 1);
1f7d2f54 48 } else {
48aecf5a
49 (*poutbuf+offset+sps_pps_size)[0] = (*poutbuf+offset+sps_pps_size)[1] = 0;
50 (*poutbuf+offset+sps_pps_size)[2] = 1;
bdfae2a5 51 }
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52
53 return 0;
bdfae2a5
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54}
55
56static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
57 AVCodecContext *avctx, const char *args,
58 uint8_t **poutbuf, int *poutbuf_size,
59 const uint8_t *buf, int buf_size,
60 int keyframe) {
61 H264BSFContext *ctx = bsfc->priv_data;
62 uint8_t unit_type;
52486603
TD
63 int32_t nal_size;
64 uint32_t cumul_size = 0;
65 const uint8_t *buf_end = buf + buf_size;
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66
67 /* nothing to filter */
68 if (!avctx->extradata || avctx->extradata_size < 6) {
69 *poutbuf = (uint8_t*) buf;
70 *poutbuf_size = buf_size;
71 return 0;
72 }
73
74 /* retrieve sps and pps NAL units from extradata */
d5cc1ed7 75 if (!ctx->extradata_parsed) {
bdfae2a5 76 uint16_t unit_size;
d5cc1ed7 77 uint64_t total_size = 0;
02dd3666 78 uint8_t *out = NULL, unit_nb, sps_done = 0, sps_seen = 0, pps_seen = 0;
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79 const uint8_t *extradata = avctx->extradata+4;
80 static const uint8_t nalu_header[4] = {0, 0, 0, 1};
81
82 /* retrieve length coded size */
83 ctx->length_size = (*extradata++ & 0x3) + 1;
84 if (ctx->length_size == 3)
85 return AVERROR(EINVAL);
86
87 /* retrieve sps and pps unit(s) */
88 unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
89 if (!unit_nb) {
90 unit_nb = *extradata++; /* number of pps unit(s) */
91 sps_done++;
02dd3666
SM
92
93 if (unit_nb)
94 pps_seen = 1;
95 }
96 else
97 {
98 sps_seen = 1;
bdfae2a5 99 }
02dd3666 100
bdfae2a5 101 while (unit_nb--) {
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102 void *tmp;
103
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104 unit_size = AV_RB16(extradata);
105 total_size += unit_size+4;
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106 if (total_size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE ||
107 extradata+2+unit_size > avctx->extradata+avctx->extradata_size) {
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108 av_free(out);
109 return AVERROR(EINVAL);
110 }
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111 tmp = av_realloc(out, total_size + FF_INPUT_BUFFER_PADDING_SIZE);
112 if (!tmp) {
113 av_free(out);
bdfae2a5 114 return AVERROR(ENOMEM);
639c697c
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115 }
116 out = tmp;
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117 memcpy(out+total_size-unit_size-4, nalu_header, 4);
118 memcpy(out+total_size-unit_size, extradata+2, unit_size);
119 extradata += 2+unit_size;
120
121 if (!unit_nb && !sps_done++)
122 unit_nb = *extradata++; /* number of pps unit(s) */
123 }
124
02dd3666
SM
125 if(out)
126 memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
127
128 if (!sps_seen)
129 av_log(avctx, AV_LOG_WARNING, "Warning: SPS NALU missing or invalid. The resulting stream may not play.\n");
130 if (!pps_seen)
131 av_log(avctx, AV_LOG_WARNING, "Warning: PPS NALU missing or invalid. The resulting stream may not play.\n");
132
d5cc1ed7
LA
133 av_free(avctx->extradata);
134 avctx->extradata = out;
135 avctx->extradata_size = total_size;
136 ctx->first_idr = 1;
137 ctx->extradata_parsed = 1;
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138 }
139
140 *poutbuf_size = 0;
141 *poutbuf = NULL;
142 do {
52486603
TD
143 if (buf + ctx->length_size > buf_end)
144 goto fail;
145
1f7d2f54 146 if (ctx->length_size == 1) {
bdfae2a5 147 nal_size = buf[0];
1f7d2f54 148 } else if (ctx->length_size == 2) {
bdfae2a5 149 nal_size = AV_RB16(buf);
1f7d2f54 150 } else
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151 nal_size = AV_RB32(buf);
152
153 buf += ctx->length_size;
154 unit_type = *buf & 0x1f;
155
52486603
TD
156 if (buf + nal_size > buf_end || nal_size < 0)
157 goto fail;
158
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159 /* prepend only to the first type 5 NAL unit of an IDR picture */
160 if (ctx->first_idr && unit_type == 5) {
639c697c 161 if (alloc_and_copy(poutbuf, poutbuf_size,
bb5cfc48 162 avctx->extradata, avctx->extradata_size,
639c697c
BF
163 buf, nal_size) < 0)
164 goto fail;
bdfae2a5 165 ctx->first_idr = 0;
1f7d2f54 166 } else {
639c697c 167 if (alloc_and_copy(poutbuf, poutbuf_size,
bb5cfc48 168 NULL, 0,
639c697c
BF
169 buf, nal_size) < 0)
170 goto fail;
bdfae2a5
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171 if (!ctx->first_idr && unit_type == 1)
172 ctx->first_idr = 1;
173 }
174
175 buf += nal_size;
176 cumul_size += nal_size + ctx->length_size;
177 } while (cumul_size < buf_size);
178
179 return 1;
52486603
TD
180
181fail:
182 av_freep(poutbuf);
183 *poutbuf_size = 0;
184 return AVERROR(EINVAL);
bdfae2a5
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185}
186
d36beb3f 187AVBitStreamFilter ff_h264_mp4toannexb_bsf = {
bdfae2a5
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188 "h264_mp4toannexb",
189 sizeof(H264BSFContext),
190 h264_mp4toannexb_filter,
bdfae2a5
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191};
192