merging fourcc with codec_tag
[libav.git] / libavformat / avidec.c
CommitLineData
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1/*
2 * AVI decoder.
19720f15 3 * Copyright (c) 2001 Fabrice Bellard.
de6d9b64 4 *
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5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
de6d9b64 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
de6d9b64 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
de6d9b64 14 *
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15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
de6d9b64 18 */
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19#include "avformat.h"
20#include "avi.h"
21
22//#define DEBUG
23
24typedef struct AVIIndex {
25 unsigned char tag[4];
26 unsigned int flags, pos, len;
27 struct AVIIndex *next;
28} AVIIndex;
29
30typedef struct {
0c1a9eda 31 int64_t movi_end;
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32 offset_t movi_list;
33 AVIIndex *first, *last;
34} AVIContext;
35
36#ifdef DEBUG
1101abfe 37static void print_tag(const char *str, unsigned int tag, int size)
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38{
39 printf("%s: tag=%c%c%c%c size=0x%x\n",
40 str, tag & 0xff,
41 (tag >> 8) & 0xff,
42 (tag >> 16) & 0xff,
43 (tag >> 24) & 0xff,
44 size);
45}
46#endif
47
1101abfe 48static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
de6d9b64 49{
c9a65ca8 50 AVIContext *avi = s->priv_data;
de6d9b64 51 ByteIOContext *pb = &s->pb;
0c1a9eda 52 uint32_t tag, tag1;
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53 int codec_type, stream_index, frame_period, bit_rate;
54 unsigned int size;
e095026a 55 int i;
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56 AVStream *st;
57
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58 /* check RIFF header */
59 tag = get_le32(pb);
60
61 if (tag != MKTAG('R', 'I', 'F', 'F'))
62 return -1;
63 get_le32(pb); /* file size */
64 tag = get_le32(pb);
65 if (tag != MKTAG('A', 'V', 'I', ' '))
66 return -1;
1101abfe 67
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68 /* first list tag */
69 stream_index = -1;
70 codec_type = -1;
71 frame_period = 0;
72 for(;;) {
73 if (url_feof(pb))
74 goto fail;
75 tag = get_le32(pb);
76 size = get_le32(pb);
77#ifdef DEBUG
78 print_tag("tag", tag, size);
79#endif
80
81 switch(tag) {
82 case MKTAG('L', 'I', 'S', 'T'):
83 /* ignored, except when start of video packets */
84 tag1 = get_le32(pb);
85#ifdef DEBUG
86 print_tag("list", tag1, 0);
87#endif
88 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
89 avi->movi_end = url_ftell(pb) + size - 4;
90#ifdef DEBUG
91 printf("movi end=%Lx\n", avi->movi_end);
92#endif
93 goto end_of_header;
94 }
95 break;
96 case MKTAG('a', 'v', 'i', 'h'):
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97 /* avi header */
98 /* using frame_period is bad idea */
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99 frame_period = get_le32(pb);
100 bit_rate = get_le32(pb) * 8;
1101abfe 101 url_fskip(pb, 4 * 4);
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102 s->nb_streams = get_le32(pb);
103 for(i=0;i<s->nb_streams;i++) {
1101abfe 104 AVStream *st = av_mallocz(sizeof(AVStream));
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105 if (!st)
106 goto fail;
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107 avcodec_get_context_defaults(&st->codec);
108
de6d9b64 109 s->streams[i] = st;
1101abfe 110 }
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111 url_fskip(pb, size - 7 * 4);
112 break;
113 case MKTAG('s', 't', 'r', 'h'):
114 /* stream header */
115 stream_index++;
116 tag1 = get_le32(pb);
117 switch(tag1) {
118 case MKTAG('v', 'i', 'd', 's'):
119 codec_type = CODEC_TYPE_VIDEO;
120 get_le32(pb); /* codec tag */
121 get_le32(pb); /* flags */
122 get_le16(pb); /* priority */
123 get_le16(pb); /* language */
124 get_le32(pb); /* XXX: initial frame ? */
125 get_le32(pb); /* scale */
126 get_le32(pb); /* rate */
9bf9a5fc 127 url_fskip(pb, size - 7 * 4);
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128 break;
129 case MKTAG('a', 'u', 'd', 's'):
130 codec_type = CODEC_TYPE_AUDIO;
131 /* nothing really useful */
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132 url_fskip(pb, size - 4);
133 break;
134 default:
135 goto fail;
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136 }
137 break;
138 case MKTAG('s', 't', 'r', 'f'):
139 /* stream header */
140 if (stream_index >= s->nb_streams) {
141 url_fskip(pb, size);
142 } else {
143 st = s->streams[stream_index];
144 switch(codec_type) {
145 case CODEC_TYPE_VIDEO:
146 get_le32(pb); /* size */
147 st->codec.width = get_le32(pb);
148 st->codec.height = get_le32(pb);
149 if (frame_period)
0c1a9eda 150 st->codec.frame_rate = (int64_t_C(1000000) * FRAME_RATE_BASE) / frame_period;
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151 else
152 st->codec.frame_rate = 25 * FRAME_RATE_BASE;
153 get_le16(pb); /* panes */
154 get_le16(pb); /* depth */
155 tag1 = get_le32(pb);
156#ifdef DEBUG
157 print_tag("video", tag1, 0);
158#endif
159 st->codec.codec_type = CODEC_TYPE_VIDEO;
160 st->codec.codec_tag = tag1;
161 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
162 url_fskip(pb, size - 5 * 4);
163 break;
9bf9a5fc 164 case CODEC_TYPE_AUDIO:
e095026a 165 get_wav_header(pb, &st->codec, (size >= 18));
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166 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
167 url_fskip(pb, 1);
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168 break;
169 default:
170 url_fskip(pb, size);
171 break;
172 }
173 }
174 break;
175 default:
176 /* skip tag */
177 size += (size & 1);
178 url_fskip(pb, size);
179 break;
180 }
181 }
182 end_of_header:
183 /* check stream number */
184 if (stream_index != s->nb_streams - 1) {
185 fail:
186 for(i=0;i<s->nb_streams;i++) {
1ea4f593 187 av_freep(&s->streams[i]);
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188 }
189 return -1;
190 }
1101abfe 191
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192 return 0;
193}
194
1101abfe 195static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
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196{
197 AVIContext *avi = s->priv_data;
198 ByteIOContext *pb = &s->pb;
199 int n, d1, d2, size;
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200
201 find_next:
202 if (url_feof(pb) || url_ftell(pb) >= avi->movi_end)
203 return -1;
204 d1 = get_byte(pb);
205 if (d1 < '0' || d1 > '9')
206 goto find_next;
207 d2 = get_byte(pb);
208 if (d2 < '0' || d2 > '9')
209 goto find_next;
210 n = (d1 - '0') * 10 + (d2 - '0');
211
212 if (n < 0 || n >= s->nb_streams)
213 goto find_next;
214
215 d1 = get_byte(pb);
216 d2 = get_byte(pb);
217 if ((d1 != 'd' && d2 != 'c') &&
218 (d1 != 'w' && d2 != 'b'))
219 goto find_next;
220
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221 size = get_le32(pb);
222 av_new_packet(pkt, size);
223 pkt->stream_index = n;
224
225 get_buffer(pb, pkt->data, pkt->size);
1101abfe 226
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227 if (size & 1)
228 get_byte(pb);
1101abfe 229
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230 return 0;
231}
232
1101abfe 233static int avi_read_close(AVFormatContext *s)
de6d9b64 234{
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235 return 0;
236}
237
238static int avi_probe(AVProbeData *p)
239{
240 /* check file header */
241 if (p->buf_size <= 32)
242 return 0;
243 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
244 p->buf[2] == 'F' && p->buf[3] == 'F' &&
245 p->buf[8] == 'A' && p->buf[9] == 'V' &&
246 p->buf[10] == 'I' && p->buf[11] == ' ')
247 return AVPROBE_SCORE_MAX;
248 else
249 return 0;
250}
251
252static AVInputFormat avi_iformat = {
253 "avi",
254 "avi format",
255 sizeof(AVIContext),
256 avi_probe,
257 avi_read_header,
258 avi_read_packet,
259 avi_read_close,
260};
261
262int avidec_init(void)
263{
264 av_register_input_format(&avi_iformat);
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265 return 0;
266}