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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 "avformat.h" | |
24 | #include "avio.h" | |
25 | #include "avc.h" | |
26 | ||
27 | static const uint8_t *ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end) | |
28 | { | |
29 | const uint8_t *a = p + 4 - ((intptr_t)p & 3); | |
30 | ||
31 | for (end -= 3; p < a && p < end; p++) { | |
32 | if (p[0] == 0 && p[1] == 0 && p[2] == 1) | |
33 | return p; | |
34 | } | |
35 | ||
36 | for (end -= 3; p < end; p += 4) { | |
37 | uint32_t x = *(const uint32_t*)p; | |
38 | // if ((x - 0x01000100) & (~x) & 0x80008000) // little endian | |
39 | // if ((x - 0x00010001) & (~x) & 0x00800080) // big endian | |
40 | if ((x - 0x01010101) & (~x) & 0x80808080) { // generic | |
41 | if (p[1] == 0) { | |
42 | if (p[0] == 0 && p[2] == 1) | |
43 | return p; | |
44 | if (p[2] == 0 && p[3] == 1) | |
45 | return p+1; | |
46 | } | |
47 | if (p[3] == 0) { | |
48 | if (p[2] == 0 && p[4] == 1) | |
49 | return p+2; | |
50 | if (p[4] == 0 && p[5] == 1) | |
51 | return p+3; | |
52 | } | |
53 | } | |
54 | } | |
55 | ||
56 | for (end += 3; p < end; p++) { | |
57 | if (p[0] == 0 && p[1] == 0 && p[2] == 1) | |
58 | return p; | |
59 | } | |
60 | ||
61 | return end + 3; | |
62 | } | |
63 | ||
64 | const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){ | |
65 | const uint8_t *out= ff_avc_find_startcode_internal(p, end); | |
66 | if(p<out && out<end && !out[-1]) out--; | |
67 | return out; | |
68 | } | |
69 | ||
70 | int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size) | |
71 | { | |
72 | const uint8_t *p = buf_in; | |
73 | const uint8_t *end = p + size; | |
74 | const uint8_t *nal_start, *nal_end; | |
75 | ||
76 | size = 0; | |
77 | nal_start = ff_avc_find_startcode(p, end); | |
78 | for (;;) { | |
79 | while (nal_start < end && !*(nal_start++)); | |
80 | if (nal_start == end) | |
81 | break; | |
82 | ||
83 | nal_end = ff_avc_find_startcode(nal_start, end); | |
84 | avio_wb32(pb, nal_end - nal_start); | |
85 | avio_write(pb, nal_start, nal_end - nal_start); | |
86 | size += 4 + nal_end - nal_start; | |
87 | nal_start = nal_end; | |
88 | } | |
89 | return size; | |
90 | } | |
91 | ||
92 | int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size) | |
93 | { | |
94 | AVIOContext *pb; | |
95 | int ret = avio_open_dyn_buf(&pb); | |
96 | if(ret < 0) | |
97 | return ret; | |
98 | ||
99 | ff_avc_parse_nal_units(pb, buf_in, *size); | |
100 | ||
101 | av_freep(buf); | |
102 | *size = avio_close_dyn_buf(pb, buf); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len) | |
107 | { | |
108 | if (len > 6) { | |
109 | /* check for h264 start code */ | |
110 | if (AV_RB32(data) == 0x00000001 || | |
111 | AV_RB24(data) == 0x000001) { | |
112 | uint8_t *buf=NULL, *end, *start; | |
113 | uint32_t sps_size=0, pps_size=0; | |
114 | uint8_t *sps=0, *pps=0; | |
115 | ||
116 | int ret = ff_avc_parse_nal_units_buf(data, &buf, &len); | |
117 | if (ret < 0) | |
118 | return ret; | |
119 | start = buf; | |
120 | end = buf + len; | |
121 | ||
122 | /* look for sps and pps */ | |
123 | while (end - buf > 4) { | |
124 | uint32_t size; | |
125 | uint8_t nal_type; | |
126 | size = FFMIN(AV_RB32(buf), end - buf - 4); | |
127 | buf += 4; | |
128 | nal_type = buf[0] & 0x1f; | |
129 | ||
130 | if (nal_type == 7) { /* SPS */ | |
131 | sps = buf; | |
132 | sps_size = size; | |
133 | } else if (nal_type == 8) { /* PPS */ | |
134 | pps = buf; | |
135 | pps_size = size; | |
136 | } | |
137 | ||
138 | buf += size; | |
139 | } | |
140 | ||
141 | if (!sps || !pps || sps_size < 4 || sps_size > UINT16_MAX || pps_size > UINT16_MAX) | |
142 | return AVERROR_INVALIDDATA; | |
143 | ||
144 | avio_w8(pb, 1); /* version */ | |
145 | avio_w8(pb, sps[1]); /* profile */ | |
146 | avio_w8(pb, sps[2]); /* profile compat */ | |
147 | avio_w8(pb, sps[3]); /* level */ | |
148 | avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */ | |
149 | avio_w8(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */ | |
150 | ||
151 | avio_wb16(pb, sps_size); | |
152 | avio_write(pb, sps, sps_size); | |
153 | avio_w8(pb, 1); /* number of pps */ | |
154 | avio_wb16(pb, pps_size); | |
155 | avio_write(pb, pps, pps_size); | |
156 | av_free(start); | |
157 | } else { | |
158 | avio_write(pb, data, len); | |
159 | } | |
160 | } | |
161 | return 0; | |
162 | } | |
163 | ||
164 | int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size) | |
165 | { | |
166 | uint16_t sps_size, pps_size; | |
167 | uint8_t *out; | |
168 | int out_size; | |
169 | ||
170 | *buf = NULL; | |
171 | if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001)) | |
172 | return 0; | |
173 | if (*size < 11 || in[0] != 1) | |
174 | return AVERROR_INVALIDDATA; | |
175 | ||
176 | sps_size = AV_RB16(&in[6]); | |
177 | if (11 + sps_size > *size) | |
178 | return AVERROR_INVALIDDATA; | |
179 | pps_size = AV_RB16(&in[9 + sps_size]); | |
180 | if (11 + sps_size + pps_size > *size) | |
181 | return AVERROR_INVALIDDATA; | |
182 | out_size = 8 + sps_size + pps_size; | |
183 | out = av_mallocz(out_size); | |
184 | if (!out) | |
185 | return AVERROR(ENOMEM); | |
186 | AV_WB32(&out[0], 0x00000001); | |
187 | memcpy(out + 4, &in[8], sps_size); | |
188 | AV_WB32(&out[4 + sps_size], 0x00000001); | |
189 | memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size); | |
190 | *buf = out; | |
191 | *size = out_size; | |
192 | return 0; | |
193 | } |