2 * "Real" compatible demuxer.
3 * Copyright (c) 2000, 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avstring.h"
23 #include "libavutil/intreadwrite.h"
29 AVPacket pkt; ///< place to store merged video frame / reordered audio data
30 int videobufsize; ///< current assembled frame size
31 int videobufpos; ///< position for the next slice in the video buffer
32 int curpic_num; ///< picture number of current frame
33 int cur_slice, slices;
34 int64_t pktpos; ///< first slice position in file
35 /// Audio descrambling matrix parameters
36 int64_t audiotimestamp; ///< Audio packet timestamp
37 int sub_packet_cnt; // Subpacket counter, used while reading
38 int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
39 int audio_framesize; /// Audio frame size from container
40 int sub_packet_lengths[16]; /// Length of each subpacket
48 int audio_stream_num; ///< Stream number for audio packets
49 int audio_pkt_cnt; ///< Output packet counter
52 static const unsigned char sipr_swaps[38][2] = {
53 { 0, 63 }, { 1, 22 }, { 2, 44 }, { 3, 90 },
54 { 5, 81 }, { 7, 31 }, { 8, 86 }, { 9, 58 },
55 { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
56 { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
57 { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
58 { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
59 { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
60 { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
61 { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
62 { 67, 83 }, { 77, 80 }
65 const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
67 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
78 if (buf_size > 0) *q = '\0';
81 static void get_str8(AVIOContext *pb, char *buf, int buf_size)
83 get_strl(pb, buf, buf_size, avio_r8(pb));
86 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
90 avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
91 if (!avctx->extradata)
92 return AVERROR(ENOMEM);
93 avctx->extradata_size = avio_read(pb, avctx->extradata, size);
94 memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
95 if (avctx->extradata_size != size)
100 static void rm_read_metadata(AVFormatContext *s, int wide)
104 for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
105 int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);
106 get_strl(s->pb, buf, sizeof(buf), len);
107 av_metadata_set2(&s->metadata, ff_rm_metadata[i], buf, 0);
111 RMStream *ff_rm_alloc_rmstream (void)
113 RMStream *rms = av_mallocz(sizeof(RMStream));
114 rms->curpic_num = -1;
118 void ff_rm_free_rmstream (RMStream *rms)
120 av_free_packet(&rms->pkt);
123 static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
124 AVStream *st, RMStream *ast, int read_all)
131 version = avio_rb16(pb); /* version */
133 int header_size = avio_rb16(pb);
134 int64_t startpos = avio_tell(pb);
136 rm_read_metadata(s, 0);
137 if ((startpos + header_size) >= avio_tell(pb) + 2) {
138 // fourcc (should always be "lpcJ")
140 get_str8(pb, buf, sizeof(buf));
142 // Skip extra header crap (this should never happen)
143 if ((startpos + header_size) > avio_tell(pb))
144 avio_skip(pb, header_size + startpos - avio_tell(pb));
145 st->codec->sample_rate = 8000;
146 st->codec->channels = 1;
147 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
148 st->codec->codec_id = CODEC_ID_RA_144;
150 int flavor, sub_packet_h, coded_framesize, sub_packet_size;
151 int codecdata_length;
152 /* old version (4) */
153 avio_skip(pb, 2); /* unused */
154 avio_rb32(pb); /* .ra4 */
155 avio_rb32(pb); /* data size */
156 avio_rb16(pb); /* version2 */
157 avio_rb32(pb); /* header size */
158 flavor= avio_rb16(pb); /* add codec info / flavor */
159 ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
160 avio_rb32(pb); /* ??? */
161 avio_rb32(pb); /* ??? */
162 avio_rb32(pb); /* ??? */
163 ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
164 st->codec->block_align= avio_rb16(pb); /* frame size */
165 ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
166 avio_rb16(pb); /* ??? */
168 avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
170 st->codec->sample_rate = avio_rb16(pb);
172 st->codec->channels = avio_rb16(pb);
175 avio_read(pb, buf, 4);
178 get_str8(pb, buf, sizeof(buf)); /* desc */
179 get_str8(pb, buf, sizeof(buf)); /* desc */
181 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
182 st->codec->codec_tag = AV_RL32(buf);
183 st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,
184 st->codec->codec_tag);
185 switch (st->codec->codec_id) {
187 st->need_parsing = AVSTREAM_PARSE_FULL;
189 case CODEC_ID_RA_288:
190 st->codec->extradata_size= 0;
191 ast->audio_framesize = st->codec->block_align;
192 st->codec->block_align = coded_framesize;
194 if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
195 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
199 av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
202 case CODEC_ID_ATRAC3:
204 avio_rb16(pb); avio_r8(pb);
207 codecdata_length = avio_rb32(pb);
208 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
209 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
213 ast->audio_framesize = st->codec->block_align;
214 if (st->codec->codec_id == CODEC_ID_SIPR) {
216 av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
220 st->codec->block_align = ff_sipr_subpk_size[flavor];
222 if(sub_packet_size <= 0){
223 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
226 st->codec->block_align = ast->sub_packet_size;
228 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
231 if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
232 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
236 av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
239 avio_rb16(pb); avio_r8(pb);
242 codecdata_length = avio_rb32(pb);
243 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
244 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
247 if (codecdata_length >= 1) {
249 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
254 av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
260 rm_read_metadata(s, 0);
267 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
268 AVStream *st, RMStream *rst, int codec_data_size)
275 av_set_pts_info(st, 64, 1, 1000);
276 codec_pos = avio_tell(pb);
278 if (v == MKTAG(0xfd, 'a', 'r', '.')) {
280 if (rm_read_audio_stream_info(s, pb, st, rst, 0))
284 if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
286 av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
289 st->codec->codec_tag = avio_rl32(pb);
290 st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,
291 st->codec->codec_tag);
292 // av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
293 if (st->codec->codec_id == CODEC_ID_NONE)
295 st->codec->width = avio_rb16(pb);
296 st->codec->height = avio_rb16(pb);
297 st->codec->time_base.num= 1;
299 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
304 if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
307 // av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
308 st->codec->time_base.den = fps * st->codec->time_base.num;
309 //XXX: do we really need that?
310 switch(st->codec->extradata[4]>>4){
311 case 1: st->codec->codec_id = CODEC_ID_RV10; break;
312 case 2: st->codec->codec_id = CODEC_ID_RV20; break;
313 case 3: st->codec->codec_id = CODEC_ID_RV30; break;
314 case 4: st->codec->codec_id = CODEC_ID_RV40; break;
316 av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);
322 /* skip codec info */
323 size = avio_tell(pb) - codec_pos;
324 avio_skip(pb, codec_data_size - size);
329 /** this function assumes that the demuxer has already seeked to the start
330 * of the INDX chunk, and will bail out if not. */
331 static int rm_read_index(AVFormatContext *s)
333 AVIOContext *pb = s->pb;
334 unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
338 if (avio_rl32(pb) != MKTAG('I','N','D','X'))
340 size = avio_rb32(pb);
344 n_pkts = avio_rb32(pb);
345 str_id = avio_rb16(pb);
346 next_off = avio_rb32(pb);
347 for (n = 0; n < s->nb_streams; n++)
348 if (s->streams[n]->id == str_id) {
352 if (n == s->nb_streams)
355 for (n = 0; n < n_pkts; n++) {
359 avio_skip(pb, 4); /* packet no. */
361 av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
365 if (next_off && avio_tell(pb) != next_off &&
366 avio_seek(pb, next_off, SEEK_SET) < 0)
373 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
375 RMDemuxContext *rm = s->priv_data;
379 st = av_new_stream(s, 0);
382 st->priv_data = ff_rm_alloc_rmstream();
383 return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
386 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
388 RMDemuxContext *rm = s->priv_data;
390 AVIOContext *pb = s->pb;
393 unsigned int start_time, duration;
394 unsigned int data_off = 0, indx_off = 0;
399 if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
400 /* very old .ra format */
401 return rm_read_header_old(s, ap);
402 } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
406 avio_rb32(pb); /* header size */
409 avio_rb32(pb); /* number of headers */
415 tag_size = avio_rb32(pb);
418 printf("tag=%c%c%c%c (%08x) size=%d\n",
426 if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
429 case MKTAG('P', 'R', 'O', 'P'):
431 avio_rb32(pb); /* max bit rate */
432 avio_rb32(pb); /* avg bit rate */
433 avio_rb32(pb); /* max packet size */
434 avio_rb32(pb); /* avg packet size */
435 avio_rb32(pb); /* nb packets */
436 avio_rb32(pb); /* duration */
437 avio_rb32(pb); /* preroll */
438 indx_off = avio_rb32(pb); /* index offset */
439 data_off = avio_rb32(pb); /* data offset */
440 avio_rb16(pb); /* nb streams */
441 flags = avio_rb16(pb); /* flags */
443 case MKTAG('C', 'O', 'N', 'T'):
444 rm_read_metadata(s, 1);
446 case MKTAG('M', 'D', 'P', 'R'):
447 st = av_new_stream(s, 0);
449 return AVERROR(ENOMEM);
450 st->id = avio_rb16(pb);
451 avio_rb32(pb); /* max bit rate */
452 st->codec->bit_rate = avio_rb32(pb); /* bit rate */
453 avio_rb32(pb); /* max packet size */
454 avio_rb32(pb); /* avg packet size */
455 start_time = avio_rb32(pb); /* start time */
456 avio_rb32(pb); /* preroll */
457 duration = avio_rb32(pb); /* duration */
458 st->start_time = start_time;
459 st->duration = duration;
460 get_str8(pb, buf, sizeof(buf)); /* desc */
461 get_str8(pb, buf, sizeof(buf)); /* mimetype */
462 st->codec->codec_type = AVMEDIA_TYPE_DATA;
463 st->priv_data = ff_rm_alloc_rmstream();
464 if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
468 case MKTAG('D', 'A', 'T', 'A'):
471 /* unknown tag: skip it */
472 avio_skip(pb, tag_size - 10);
477 rm->nb_packets = avio_rb32(pb); /* number of packets */
478 if (!rm->nb_packets && (flags & 4))
479 rm->nb_packets = 3600 * 25;
480 avio_rb32(pb); /* next data header */
483 data_off = avio_tell(pb) - 18;
484 if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
485 avio_seek(pb, indx_off, SEEK_SET) >= 0) {
487 avio_seek(pb, data_off + 18, SEEK_SET);
493 static int get_num(AVIOContext *pb, int *len)
505 return (n << 16) | n1;
509 /* multiple of 20 bytes for ra144 (ugly) */
510 #define RAW_PACKET_SIZE 1000
512 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
513 RMDemuxContext *rm = s->priv_data;
514 AVIOContext *pb = s->pb;
516 uint32_t state=0xFFFFFFFF;
518 while(!url_feof(pb)){
520 *pos= avio_tell(pb) - 3;
521 if(rm->remaining_len > 0){
522 num= rm->current_stream;
523 len= rm->remaining_len;
524 *timestamp = AV_NOPTS_VALUE;
527 state= (state<<8) + avio_r8(pb);
529 if(state == MKBETAG('I', 'N', 'D', 'X')){
530 int n_pkts, expected_len;
533 n_pkts = avio_rb32(pb);
534 expected_len = 20 + n_pkts * 14;
536 /* some files don't add index entries to chunk size... */
538 else if (len != expected_len)
539 av_log(s, AV_LOG_WARNING,
540 "Index size %d (%d pkts) is wrong, should be %d.\n",
541 len, n_pkts, expected_len);
542 len -= 14; // we already read part of the index header
546 } else if (state == MKBETAG('D','A','T','A')) {
547 av_log(s, AV_LOG_WARNING,
548 "DATA tag in middle of chunk, file may be broken.\n");
551 if(state > (unsigned)0xFFFF || state <= 12)
557 *timestamp = avio_rb32(pb);
558 avio_r8(pb); /* reserved */
559 *flags = avio_r8(pb); /* flags */
561 for(i=0;i<s->nb_streams;i++) {
566 if (i == s->nb_streams) {
568 /* skip packet if unknown number */
570 rm->remaining_len = 0;
580 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
581 RMDemuxContext *rm, RMStream *vst,
582 AVPacket *pkt, int len, int *pseq)
584 int hdr, seq, pic_num, len2, pos;
587 hdr = avio_r8(pb); len--;
590 if(type != 3){ // not frame as a part of packet
591 seq = avio_r8(pb); len--;
593 if(type != 1){ // not whole frame
594 len2 = get_num(pb, &len);
595 pos = get_num(pb, &len);
596 pic_num = avio_r8(pb); len--;
600 rm->remaining_len = len;
601 if(type&1){ // frame, not slice
602 if(type == 3) // frame as a part of packet
604 if(rm->remaining_len < len)
606 rm->remaining_len -= len;
607 if(av_new_packet(pkt, len + 9) < 0)
610 AV_WL32(pkt->data + 1, 1);
611 AV_WL32(pkt->data + 5, 0);
612 avio_read(pb, pkt->data + 9, len);
615 //now we have to deal with single slice
618 if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
619 vst->slices = ((hdr & 0x3F) << 1) + 1;
620 vst->videobufsize = len2 + 8*vst->slices + 1;
621 av_free_packet(&vst->pkt); //FIXME this should be output.
622 if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
623 return AVERROR(ENOMEM);
624 vst->videobufpos = 8*vst->slices + 1;
626 vst->curpic_num = pic_num;
627 vst->pktpos = avio_tell(pb);
630 len = FFMIN(len, pos);
632 if(++vst->cur_slice > vst->slices)
634 AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
635 AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
636 if(vst->videobufpos + len > vst->videobufsize)
638 if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
640 vst->videobufpos += len;
641 rm->remaining_len-= len;
643 if(type == 2 || (vst->videobufpos) == vst->videobufsize){
644 vst->pkt.data[0] = vst->cur_slice-1;
648 if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
649 memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
650 vst->videobufpos - 1 - 8*vst->slices);
651 pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
652 pkt->pts = AV_NOPTS_VALUE;
653 pkt->pos = vst->pktpos;
662 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
667 if (st->codec->codec_id == CODEC_ID_AC3) {
669 for (j=0;j<pkt->size;j+=2) {
670 FFSWAP(int, ptr[0], ptr[1]);
677 * Perform 4-bit block reordering for SIPR data.
678 * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
680 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
682 int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
684 for (n = 0; n < 38; n++) {
686 int i = bs * sipr_swaps[n][0];
687 int o = bs * sipr_swaps[n][1];
689 /* swap 4bit-nibbles of block 'i' with 'o' */
690 for (j = 0; j < bs; j++, i++, o++) {
691 int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
692 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
694 buf[o >> 1] = (x << (4 * (o & 1))) |
695 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
696 buf[i >> 1] = (y << (4 * (i & 1))) |
697 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
703 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
704 AVStream *st, RMStream *ast, int len, AVPacket *pkt,
705 int *seq, int flags, int64_t timestamp)
707 RMDemuxContext *rm = s->priv_data;
709 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
710 rm->current_stream= st->id;
711 if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
712 return -1; //got partial frame
713 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
714 if ((st->codec->codec_id == CODEC_ID_RA_288) ||
715 (st->codec->codec_id == CODEC_ID_COOK) ||
716 (st->codec->codec_id == CODEC_ID_ATRAC3) ||
717 (st->codec->codec_id == CODEC_ID_SIPR)) {
719 int sps = ast->sub_packet_size;
720 int cfs = ast->coded_framesize;
721 int h = ast->sub_packet_h;
722 int y = ast->sub_packet_cnt;
723 int w = ast->audio_framesize;
726 y = ast->sub_packet_cnt = 0;
728 ast->audiotimestamp = timestamp;
730 switch(st->codec->codec_id) {
731 case CODEC_ID_RA_288:
732 for (x = 0; x < h/2; x++)
733 avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
735 case CODEC_ID_ATRAC3:
737 for (x = 0; x < w/sps; x++)
738 avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
741 avio_read(pb, ast->pkt.data + y * w, w);
745 if (++(ast->sub_packet_cnt) < h)
747 if (st->codec->codec_id == CODEC_ID_SIPR)
748 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
750 ast->sub_packet_cnt = 0;
751 rm->audio_stream_num = st->index;
752 rm->audio_pkt_cnt = h * w / st->codec->block_align;
753 } else if (st->codec->codec_id == CODEC_ID_AAC) {
755 rm->audio_stream_num = st->index;
756 ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
757 if (ast->sub_packet_cnt) {
758 for (x = 0; x < ast->sub_packet_cnt; x++)
759 ast->sub_packet_lengths[x] = avio_rb16(pb);
760 rm->audio_pkt_cnt = ast->sub_packet_cnt;
761 ast->audiotimestamp = timestamp;
765 av_get_packet(pb, pkt, len);
766 rm_ac3_swap_bytes(st, pkt);
769 av_get_packet(pb, pkt, len);
771 pkt->stream_index = st->index;
774 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
775 if(st->codec->codec_id == CODEC_ID_RV20){
776 int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
777 av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
779 seq |= (timestamp&~0x3FFF);
780 if(seq - timestamp > 0x2000) seq -= 0x4000;
781 if(seq - timestamp < -0x2000) seq += 0x4000;
788 pkt->flags |= AV_PKT_FLAG_KEY;
790 return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
794 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
795 AVStream *st, RMStream *ast, AVPacket *pkt)
797 RMDemuxContext *rm = s->priv_data;
799 assert (rm->audio_pkt_cnt > 0);
801 if (st->codec->codec_id == CODEC_ID_AAC)
802 av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
804 av_new_packet(pkt, st->codec->block_align);
805 memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
806 (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
807 st->codec->block_align);
810 if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
811 ast->audiotimestamp = AV_NOPTS_VALUE;
812 pkt->flags = AV_PKT_FLAG_KEY;
815 pkt->stream_index = st->index;
817 return rm->audio_pkt_cnt;
820 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
822 RMDemuxContext *rm = s->priv_data;
824 int i, len, res, seq = 1;
825 int64_t timestamp, pos;
829 if (rm->audio_pkt_cnt) {
830 // If there are queued audio packet return them first
831 st = s->streams[rm->audio_stream_num];
832 ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
835 if (rm->old_format) {
840 timestamp = AV_NOPTS_VALUE;
841 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
842 ast->coded_framesize * ast->sub_packet_h / 2;
843 flags = (seq++ == 1) ? 2 : 0;
844 pos = avio_tell(s->pb);
846 len=sync(s, ×tamp, &flags, &i, &pos);
851 if(len<0 || url_feof(s->pb))
854 res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
855 &seq, flags, timestamp);
856 if((flags&2) && (seq&0x7F) == 1)
857 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
862 if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
863 || st->discard >= AVDISCARD_ALL){
872 static int rm_read_close(AVFormatContext *s)
876 for (i=0;i<s->nb_streams;i++)
877 ff_rm_free_rmstream(s->streams[i]->priv_data);
882 static int rm_probe(AVProbeData *p)
884 /* check file header */
885 if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
886 p->buf[2] == 'M' && p->buf[3] == 'F' &&
887 p->buf[4] == 0 && p->buf[5] == 0) ||
888 (p->buf[0] == '.' && p->buf[1] == 'r' &&
889 p->buf[2] == 'a' && p->buf[3] == 0xfd))
890 return AVPROBE_SCORE_MAX;
895 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
896 int64_t *ppos, int64_t pos_limit)
898 RMDemuxContext *rm = s->priv_data;
900 int stream_index2, flags, len, h;
905 return AV_NOPTS_VALUE;
907 avio_seek(s->pb, pos, SEEK_SET);
913 len=sync(s, &dts, &flags, &stream_index2, &pos);
915 return AV_NOPTS_VALUE;
917 st = s->streams[stream_index2];
918 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
919 h= avio_r8(s->pb); len--;
921 seq = avio_r8(s->pb); len--;
925 if((flags&2) && (seq&0x7F) == 1){
926 // av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
927 av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
928 if(stream_index2 == stream_index)
932 avio_skip(s->pb, len);
938 AVInputFormat ff_rm_demuxer = {
940 NULL_IF_CONFIG_SMALL("RealMedia format"),
941 sizeof(RMDemuxContext),
950 AVInputFormat ff_rdt_demuxer = {
952 NULL_IF_CONFIG_SMALL("RDT demuxer"),
953 sizeof(RMDemuxContext),