3 * Copyright (c) 2001 Fabrice Bellard.
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.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
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
24 static const struct AVI1Handler {
29 { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'd') },
30 { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 'h', 'd') },
31 { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'l') },
32 /* This is supposed to be the last one */
33 { CODEC_ID_NONE, CODEC_ID_NONE, 0 },
36 typedef struct AVIIndex {
38 unsigned int flags, pos, len;
39 struct AVIIndex *next;
50 AVIIndex *first, *last;
54 static void print_tag(const char *str, unsigned int tag, int size)
56 printf("%s: tag=%c%c%c%c size=0x%x\n",
65 static int get_riff(AVIContext *avi, ByteIOContext *pb)
68 /* check RIFF header */
71 if (tag != MKTAG('R', 'I', 'F', 'F'))
73 avi->riff_end = get_le32(pb); /* RIFF chunk size */
74 avi->riff_end += url_ftell(pb); /* RIFF chunk end */
76 if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
82 static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
84 AVIContext *avi = s->priv_data;
85 ByteIOContext *pb = &s->pb;
86 uint32_t tag, tag1, handler;
87 int codec_type, stream_index, frame_period, bit_rate, scale, rate;
88 unsigned int size, nb_frames;
91 int xan_video = 0; /* hack to support Xan A/V */
93 if (get_riff(avi, pb) < 0)
101 avi->buf = av_malloc(1);
111 print_tag("tag", tag, size);
115 case MKTAG('L', 'I', 'S', 'T'):
116 /* ignored, except when start of video packets */
119 print_tag("list", tag1, 0);
121 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
122 avi->movi_end = url_ftell(pb) + size - 4;
124 printf("movi end=%Lx\n", avi->movi_end);
129 case MKTAG('a', 'v', 'i', 'h'):
131 /* using frame_period is bad idea */
132 frame_period = get_le32(pb);
133 bit_rate = get_le32(pb) * 8;
134 url_fskip(pb, 4 * 4);
137 st = av_new_stream(s, 0);
141 url_fskip(pb, size - 7 * 4);
143 case MKTAG('s', 't', 'r', 'h'):
148 case MKTAG('i', 'a', 'v', 's'):
149 case MKTAG('i', 'v', 'a', 's'):
150 if (s->nb_streams != 1)
153 avi->stream_index = 0;
154 case MKTAG('v', 'i', 'd', 's'):
155 codec_type = CODEC_TYPE_VIDEO;
157 if (stream_index >= s->nb_streams) {
158 url_fskip(pb, size - 4);
162 st = s->streams[stream_index];
164 handler = get_le32(pb); /* codec tag */
165 get_le32(pb); /* flags */
166 get_le16(pb); /* priority */
167 get_le16(pb); /* language */
168 get_le32(pb); /* XXX: initial frame ? */
169 scale = get_le32(pb); /* scale */
170 rate = get_le32(pb); /* rate */
173 st->codec.frame_rate = rate;
174 st->codec.frame_rate_base = scale;
175 }else if(frame_period){
176 st->codec.frame_rate = 1000000;
177 st->codec.frame_rate_base = frame_period;
179 st->codec.frame_rate = 25;
180 st->codec.frame_rate_base = 1;
182 get_le32(pb); /* start */
183 nb_frames = get_le32(pb);
185 st->duration = (double)nb_frames *
186 st->codec.frame_rate_base * AV_TIME_BASE /
187 st->codec.frame_rate;
189 if (avi->type == 1) {
192 st = av_new_stream(s, 0);
198 for (i=0; AVI1Handlers[i].tag != 0; ++i)
199 if (AVI1Handlers[i].tag == handler)
202 if (AVI1Handlers[i].tag != 0) {
203 s->streams[0]->codec.codec_type = CODEC_TYPE_VIDEO;
204 s->streams[0]->codec.codec_id = AVI1Handlers[i].vcid;
205 s->streams[1]->codec.codec_type = CODEC_TYPE_AUDIO;
206 s->streams[1]->codec.codec_id = AVI1Handlers[i].acid;
212 url_fskip(pb, size - 9 * 4);
214 case MKTAG('a', 'u', 'd', 's'):
216 unsigned int length, rate;
218 codec_type = CODEC_TYPE_AUDIO;
220 if (stream_index >= s->nb_streams) {
221 url_fskip(pb, size - 4);
224 st = s->streams[stream_index];
226 get_le32(pb); /* tag */
227 get_le32(pb); /* flags */
228 get_le16(pb); /* priority */
229 get_le16(pb); /* language */
230 get_le32(pb); /* initial frame */
231 get_le32(pb); /* scale */
233 get_le32(pb); /* start */
234 length = get_le32(pb); /* length, in samples or bytes */
237 st->duration = (int64_t)length * AV_TIME_BASE / rate;
238 url_fskip(pb, size - 9 * 4);
245 case MKTAG('s', 't', 'r', 'f'):
247 if (stream_index >= s->nb_streams || avi->type == 1) {
250 st = s->streams[stream_index];
252 case CODEC_TYPE_VIDEO:
253 get_le32(pb); /* size */
254 st->codec.width = get_le32(pb);
255 st->codec.height = get_le32(pb);
256 get_le16(pb); /* panes */
257 st->codec.bits_per_sample= get_le16(pb); /* depth */
259 get_le32(pb); /* ImageSize */
260 get_le32(pb); /* XPelsPerMeter */
261 get_le32(pb); /* YPelsPerMeter */
262 get_le32(pb); /* ClrUsed */
263 get_le32(pb); /* ClrImportant */
265 st->codec.extradata_size= size - 10*4;
266 st->codec.extradata= av_malloc(st->codec.extradata_size);
267 get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
269 if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
273 print_tag("video", tag1, 0);
275 st->codec.codec_type = CODEC_TYPE_VIDEO;
276 st->codec.codec_tag = tag1;
277 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
278 if (st->codec.codec_id == CODEC_ID_XAN_WC4)
280 // url_fskip(pb, size - 5 * 4);
282 case CODEC_TYPE_AUDIO:
283 get_wav_header(pb, &st->codec, size);
284 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
286 /* special case time: To support Xan DPCM, hardcode
287 * the format if Xxan is the video codec */
289 st->codec.codec_id = CODEC_ID_XAN_DPCM;
305 /* check stream number */
306 if (stream_index != s->nb_streams - 1) {
309 for(i=0;i<s->nb_streams;i++) {
310 av_freep(&s->streams[i]->codec.extradata);
311 av_freep(&s->streams[i]);
319 static void __destruct_pkt(struct AVPacket *pkt)
321 pkt->data = NULL; pkt->size = 0;
325 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
327 AVIContext *avi = s->priv_data;
328 ByteIOContext *pb = &s->pb;
329 int n, d[8], size, i;
331 memset(d, -1, sizeof(int)*8);
333 if (avi->type == 1 && avi->stream_index) {
334 /* duplicate DV packet */
336 pkt->data = avi->buf;
337 pkt->size = avi->buf_size;
338 pkt->destruct = __destruct_pkt;
339 pkt->stream_index = avi->stream_index;
340 avi->stream_index = !avi->stream_index;
344 for(i=url_ftell(pb); !url_feof(pb); i++) {
347 if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
348 uint32_t tag, size, tag2;
349 url_fskip(pb, avi->riff_end - url_ftell(pb));
350 if (get_riff(avi, pb) < 0)
356 if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
357 avi->movi_end = url_ftell(pb) + size - 4;
366 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
369 n= (d[2] - '0') * 10 + (d[3] - '0');
370 if( d[2] >= '0' && d[2] <= '9'
371 && d[3] >= '0' && d[3] <= '9'
372 && d[0] == 'i' && d[1] == 'x'
374 && i + size <= avi->movi_end){
380 n= (d[0] - '0') * 10 + (d[1] - '0');
381 if( d[0] >= '0' && d[0] <= '9'
382 && d[1] >= '0' && d[1] <= '9'
383 && ((d[2] == 'd' && d[3] == 'c') ||
384 (d[2] == 'w' && d[3] == 'b') ||
385 (d[2] == 'd' && d[3] == 'b') ||
386 (d[2] == '_' && d[3] == '_'))
388 && i + size <= avi->movi_end) {
390 if (avi->type == 1) {
391 uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
395 avi->buf_size = size;
397 pkt->data = avi->buf;
398 pkt->size = avi->buf_size;
399 pkt->destruct = __destruct_pkt;
400 avi->stream_index = n;
402 av_new_packet(pkt, size);
404 get_buffer(pb, pkt->data, size);
407 pkt->stream_index = n;
408 pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read index for that
415 static int avi_read_close(AVFormatContext *s)
418 AVIContext *avi = s->priv_data;
421 for(i=0;i<s->nb_streams;i++) {
422 AVStream *st = s->streams[i];
423 // av_free(st->priv_data);
424 av_free(st->codec.extradata);
430 static int avi_probe(AVProbeData *p)
432 /* check file header */
433 if (p->buf_size <= 32)
435 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
436 p->buf[2] == 'F' && p->buf[3] == 'F' &&
437 p->buf[8] == 'A' && p->buf[9] == 'V' &&
438 p->buf[10] == 'I' && p->buf[11] == ' ')
439 return AVPROBE_SCORE_MAX;
444 static AVInputFormat avi_iformat = {
454 int avidec_init(void)
456 av_register_input_format(&avi_iformat);