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;
92 if (get_riff(avi, pb) < 0)
100 avi->buf = av_malloc(1);
110 print_tag("tag", tag, size);
114 case MKTAG('L', 'I', 'S', 'T'):
115 /* ignored, except when start of video packets */
118 print_tag("list", tag1, 0);
120 if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
121 avi->movi_end = url_ftell(pb) + size - 4;
123 printf("movi end=%Lx\n", avi->movi_end);
128 case MKTAG('a', 'v', 'i', 'h'):
130 /* using frame_period is bad idea */
131 frame_period = get_le32(pb);
132 bit_rate = get_le32(pb) * 8;
133 url_fskip(pb, 4 * 4);
134 s->nb_streams = get_le32(pb);
135 for(i=0;i<s->nb_streams;i++) {
136 AVStream *st = av_mallocz(sizeof(AVStream));
139 avcodec_get_context_defaults(&st->codec);
143 url_fskip(pb, size - 7 * 4);
145 case MKTAG('s', 't', 'r', 'h'):
150 case MKTAG('i', 'a', 'v', 's'):
151 case MKTAG('i', 'v', 'a', 's'):
152 if (s->nb_streams != 1)
155 avi->stream_index = 0;
156 case MKTAG('v', 'i', 'd', 's'):
157 codec_type = CODEC_TYPE_VIDEO;
159 if (stream_index >= s->nb_streams) {
160 url_fskip(pb, size - 4);
164 st = s->streams[stream_index];
166 handler = get_le32(pb); /* codec tag */
167 get_le32(pb); /* flags */
168 get_le16(pb); /* priority */
169 get_le16(pb); /* language */
170 get_le32(pb); /* XXX: initial frame ? */
171 scale = get_le32(pb); /* scale */
172 rate = get_le32(pb); /* rate */
175 st->codec.frame_rate = rate;
176 st->codec.frame_rate_base = scale;
177 }else if(frame_period){
178 st->codec.frame_rate = 1000000;
179 st->codec.frame_rate_base = frame_period;
181 st->codec.frame_rate = 25;
182 st->codec.frame_rate_base = 1;
185 if (avi->type == 1) {
186 AVStream *st = av_mallocz(sizeof(AVStream));
190 avcodec_get_context_defaults(&st->codec);
191 s->streams[s->nb_streams++] = st;
194 for (i=0; AVI1Handlers[i].tag != 0; ++i)
195 if (AVI1Handlers[i].tag == handler)
198 if (AVI1Handlers[i].tag != 0) {
199 s->streams[0]->codec.codec_type = CODEC_TYPE_VIDEO;
200 s->streams[0]->codec.codec_id = AVI1Handlers[i].vcid;
201 s->streams[1]->codec.codec_type = CODEC_TYPE_AUDIO;
202 s->streams[1]->codec.codec_id = AVI1Handlers[i].acid;
207 url_fskip(pb, size - 7 * 4);
209 case MKTAG('a', 'u', 'd', 's'):
210 codec_type = CODEC_TYPE_AUDIO;
211 /* nothing really useful */
212 url_fskip(pb, size - 4);
218 case MKTAG('s', 't', 'r', 'f'):
220 if (stream_index >= s->nb_streams || avi->type == 1) {
223 st = s->streams[stream_index];
225 case CODEC_TYPE_VIDEO:
226 get_le32(pb); /* size */
227 st->codec.width = get_le32(pb);
228 st->codec.height = get_le32(pb);
229 get_le16(pb); /* panes */
230 st->codec.bits_per_sample= get_le16(pb); /* depth */
232 get_le32(pb); /* ImageSize */
233 get_le32(pb); /* XPelsPerMeter */
234 get_le32(pb); /* YPelsPerMeter */
235 get_le32(pb); /* ClrUsed */
236 get_le32(pb); /* ClrImportant */
238 st->codec.extradata_size= size - 10*4;
239 st->codec.extradata= av_malloc(st->codec.extradata_size);
240 get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
242 if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
246 print_tag("video", tag1, 0);
248 st->codec.codec_type = CODEC_TYPE_VIDEO;
249 st->codec.codec_tag = tag1;
250 st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
251 // url_fskip(pb, size - 5 * 4);
253 case CODEC_TYPE_AUDIO:
254 get_wav_header(pb, &st->codec, size);
255 if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
272 /* check stream number */
273 if (stream_index != s->nb_streams - 1) {
276 for(i=0;i<s->nb_streams;i++) {
277 av_freep(&s->streams[i]->codec.extradata);
278 av_freep(&s->streams[i]);
286 static void __destruct_pkt(struct AVPacket *pkt)
288 pkt->data = NULL; pkt->size = 0;
292 static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
294 AVIContext *avi = s->priv_data;
295 ByteIOContext *pb = &s->pb;
296 int n, d[8], size, i;
298 memset(d, -1, sizeof(int)*8);
300 if (avi->type == 1 && avi->stream_index) {
301 /* duplicate DV packet */
303 pkt->data = avi->buf;
304 pkt->size = avi->buf_size;
305 pkt->destruct = __destruct_pkt;
306 pkt->stream_index = avi->stream_index;
307 avi->stream_index = !avi->stream_index;
311 for(i=url_ftell(pb); !url_feof(pb); i++) {
314 if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
315 uint32_t tag, size, tag2;
316 url_fskip(pb, avi->riff_end - url_ftell(pb));
317 if (get_riff(avi, pb) < 0)
323 if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
324 avi->movi_end = url_ftell(pb) + size - 4;
333 size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
336 n= (d[2] - '0') * 10 + (d[3] - '0');
337 if( d[2] >= '0' && d[2] <= '9'
338 && d[3] >= '0' && d[3] <= '9'
339 && d[0] == 'i' && d[1] == 'x'
341 && i + size <= avi->movi_end){
347 n= (d[0] - '0') * 10 + (d[1] - '0');
348 if( d[0] >= '0' && d[0] <= '9'
349 && d[1] >= '0' && d[1] <= '9'
350 && ((d[2] == 'd' && d[3] == 'c') ||
351 (d[2] == 'w' && d[3] == 'b') ||
352 (d[2] == 'd' && d[3] == 'b') ||
353 (d[2] == '_' && d[3] == '_'))
355 && i + size <= avi->movi_end) {
357 if (avi->type == 1) {
358 uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
362 avi->buf_size = size;
364 pkt->data = avi->buf;
365 pkt->size = avi->buf_size;
366 pkt->destruct = __destruct_pkt;
367 avi->stream_index = n;
369 av_new_packet(pkt, size);
371 get_buffer(pb, pkt->data, size);
374 pkt->stream_index = n;
375 pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read index for that
382 static int avi_read_close(AVFormatContext *s)
385 AVIContext *avi = s->priv_data;
388 for(i=0;i<s->nb_streams;i++) {
389 AVStream *st = s->streams[i];
390 // av_free(st->priv_data);
391 av_free(st->codec.extradata);
397 static int avi_probe(AVProbeData *p)
399 /* check file header */
400 if (p->buf_size <= 32)
402 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
403 p->buf[2] == 'F' && p->buf[3] == 'F' &&
404 p->buf[8] == 'A' && p->buf[9] == 'V' &&
405 p->buf[10] == 'I' && p->buf[11] == ' ')
406 return AVPROBE_SCORE_MAX;
411 static AVInputFormat avi_iformat = {
421 int avidec_init(void)
423 av_register_input_format(&avi_iformat);