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 AVCodecTag rm_codec_tags[] = {
53 { CODEC_ID_RV10, MKTAG('R','V','1','0') },
54 { CODEC_ID_RV20, MKTAG('R','V','2','0') },
55 { CODEC_ID_RV20, MKTAG('R','V','T','R') },
56 { CODEC_ID_RV30, MKTAG('R','V','3','0') },
57 { CODEC_ID_RV40, MKTAG('R','V','4','0') },
58 { CODEC_ID_AC3, MKTAG('d','n','e','t') },
59 { CODEC_ID_RA_144, MKTAG('l','p','c','J') },
60 { CODEC_ID_RA_288, MKTAG('2','8','_','8') },
61 { CODEC_ID_COOK, MKTAG('c','o','o','k') },
62 { CODEC_ID_ATRAC3, MKTAG('a','t','r','c') },
63 { CODEC_ID_SIPR, MKTAG('s','i','p','r') },
64 { CODEC_ID_AAC, MKTAG('r','a','a','c') },
65 { CODEC_ID_AAC, MKTAG('r','a','c','p') },
69 static const unsigned char sipr_swaps[38][2] = {
70 { 0, 63 }, { 1, 22 }, { 2, 44 }, { 3, 90 },
71 { 5, 81 }, { 7, 31 }, { 8, 86 }, { 9, 58 },
72 { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
73 { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
74 { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
75 { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
76 { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
77 { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
78 { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
79 { 67, 83 }, { 77, 80 }
82 const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
84 static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
95 if (buf_size > 0) *q = '\0';
98 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
100 get_strl(pb, buf, buf_size, get_byte(pb));
103 static int rm_read_extradata(ByteIOContext *pb, AVCodecContext *avctx, unsigned size)
107 avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
108 if (!avctx->extradata)
109 return AVERROR(ENOMEM);
110 avctx->extradata_size = get_buffer(pb, avctx->extradata, size);
111 memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
112 if (avctx->extradata_size != size)
117 static void rm_read_metadata(AVFormatContext *s, int wide)
121 for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
122 int len = wide ? get_be16(s->pb) : get_byte(s->pb);
123 get_strl(s->pb, buf, sizeof(buf), len);
124 av_metadata_set2(&s->metadata, ff_rm_metadata[i], buf, 0);
128 RMStream *ff_rm_alloc_rmstream (void)
130 RMStream *rms = av_mallocz(sizeof(RMStream));
131 rms->curpic_num = -1;
135 void ff_rm_free_rmstream (RMStream *rms)
137 av_free_packet(&rms->pkt);
140 static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
141 AVStream *st, RMStream *ast, int read_all)
148 version = get_be16(pb); /* version */
150 int header_size = get_be16(pb);
151 int64_t startpos = url_ftell(pb);
153 rm_read_metadata(s, 0);
154 if ((startpos + header_size) >= url_ftell(pb) + 2) {
155 // fourcc (should always be "lpcJ")
157 get_str8(pb, buf, sizeof(buf));
159 // Skip extra header crap (this should never happen)
160 if ((startpos + header_size) > url_ftell(pb))
161 url_fskip(pb, header_size + startpos - url_ftell(pb));
162 st->codec->sample_rate = 8000;
163 st->codec->channels = 1;
164 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
165 st->codec->codec_id = CODEC_ID_RA_144;
167 int flavor, sub_packet_h, coded_framesize, sub_packet_size;
168 int codecdata_length;
169 /* old version (4) */
170 url_fskip(pb, 2); /* unused */
171 get_be32(pb); /* .ra4 */
172 get_be32(pb); /* data size */
173 get_be16(pb); /* version2 */
174 get_be32(pb); /* header size */
175 flavor= get_be16(pb); /* add codec info / flavor */
176 ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
177 get_be32(pb); /* ??? */
178 get_be32(pb); /* ??? */
179 get_be32(pb); /* ??? */
180 ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
181 st->codec->block_align= get_be16(pb); /* frame size */
182 ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
183 get_be16(pb); /* ??? */
185 get_be16(pb); get_be16(pb); get_be16(pb);
187 st->codec->sample_rate = get_be16(pb);
189 st->codec->channels = get_be16(pb);
192 get_buffer(pb, buf, 4);
195 get_str8(pb, buf, sizeof(buf)); /* desc */
196 get_str8(pb, buf, sizeof(buf)); /* desc */
198 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
199 st->codec->codec_tag = AV_RL32(buf);
200 st->codec->codec_id = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);
201 switch (st->codec->codec_id) {
203 st->need_parsing = AVSTREAM_PARSE_FULL;
205 case CODEC_ID_RA_288:
206 st->codec->extradata_size= 0;
207 ast->audio_framesize = st->codec->block_align;
208 st->codec->block_align = coded_framesize;
210 if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
211 av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
215 av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
218 case CODEC_ID_ATRAC3:
220 get_be16(pb); get_byte(pb);
223 codecdata_length = get_be32(pb);
224 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
225 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
229 if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
230 else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
231 else st->codec->codec_id = CODEC_ID_ATRAC3;
233 ast->audio_framesize = st->codec->block_align;
234 if (st->codec->codec_id == CODEC_ID_SIPR) {
236 av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
240 st->codec->block_align = ff_sipr_subpk_size[flavor];
242 if(sub_packet_size <= 0){
243 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
246 st->codec->block_align = ast->sub_packet_size;
248 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
251 if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
252 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
256 av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
259 get_be16(pb); get_byte(pb);
262 st->codec->codec_id = CODEC_ID_AAC;
263 codecdata_length = get_be32(pb);
264 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
265 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
268 if (codecdata_length >= 1) {
270 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
275 av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
281 rm_read_metadata(s, 0);
288 ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
289 AVStream *st, RMStream *rst, int codec_data_size)
296 av_set_pts_info(st, 64, 1, 1000);
297 codec_pos = url_ftell(pb);
299 if (v == MKTAG(0xfd, 'a', 'r', '.')) {
301 if (rm_read_audio_stream_info(s, pb, st, rst, 0))
305 if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
307 av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
310 st->codec->codec_tag = get_le32(pb);
311 st->codec->codec_id = ff_codec_get_id(rm_codec_tags, st->codec->codec_tag);
312 // av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
313 if (st->codec->codec_id == CODEC_ID_NONE)
315 st->codec->width = get_be16(pb);
316 st->codec->height = get_be16(pb);
317 st->codec->time_base.num= 1;
319 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
324 if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (url_ftell(pb) - codec_pos))) < 0)
327 // av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
328 st->codec->time_base.den = fps * st->codec->time_base.num;
329 //XXX: do we really need that?
330 switch(st->codec->extradata[4]>>4){
331 case 1: st->codec->codec_id = CODEC_ID_RV10; break;
332 case 2: st->codec->codec_id = CODEC_ID_RV20; break;
333 case 3: st->codec->codec_id = CODEC_ID_RV30; break;
334 case 4: st->codec->codec_id = CODEC_ID_RV40; break;
336 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]);
342 /* skip codec info */
343 size = url_ftell(pb) - codec_pos;
344 url_fskip(pb, codec_data_size - size);
349 /** this function assumes that the demuxer has already seeked to the start
350 * of the INDX chunk, and will bail out if not. */
351 static int rm_read_index(AVFormatContext *s)
353 ByteIOContext *pb = s->pb;
354 unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
358 if (get_le32(pb) != MKTAG('I','N','D','X'))
364 n_pkts = get_be32(pb);
365 str_id = get_be16(pb);
366 next_off = get_be32(pb);
367 for (n = 0; n < s->nb_streams; n++)
368 if (s->streams[n]->id == str_id) {
372 if (n == s->nb_streams)
375 for (n = 0; n < n_pkts; n++) {
379 url_fskip(pb, 4); /* packet no. */
381 av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
385 if (next_off && url_ftell(pb) != next_off &&
386 url_fseek(pb, next_off, SEEK_SET) < 0)
393 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
395 RMDemuxContext *rm = s->priv_data;
399 st = av_new_stream(s, 0);
402 st->priv_data = ff_rm_alloc_rmstream();
403 return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
406 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
408 RMDemuxContext *rm = s->priv_data;
410 ByteIOContext *pb = s->pb;
413 unsigned int start_time, duration;
414 unsigned int data_off = 0, indx_off = 0;
419 if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
420 /* very old .ra format */
421 return rm_read_header_old(s, ap);
422 } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
426 get_be32(pb); /* header size */
429 get_be32(pb); /* number of headers */
435 tag_size = get_be32(pb);
438 printf("tag=%c%c%c%c (%08x) size=%d\n",
446 if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
449 case MKTAG('P', 'R', 'O', 'P'):
451 get_be32(pb); /* max bit rate */
452 get_be32(pb); /* avg bit rate */
453 get_be32(pb); /* max packet size */
454 get_be32(pb); /* avg packet size */
455 get_be32(pb); /* nb packets */
456 get_be32(pb); /* duration */
457 get_be32(pb); /* preroll */
458 indx_off = get_be32(pb); /* index offset */
459 data_off = get_be32(pb); /* data offset */
460 get_be16(pb); /* nb streams */
461 flags = get_be16(pb); /* flags */
463 case MKTAG('C', 'O', 'N', 'T'):
464 rm_read_metadata(s, 1);
466 case MKTAG('M', 'D', 'P', 'R'):
467 st = av_new_stream(s, 0);
469 return AVERROR(ENOMEM);
470 st->id = get_be16(pb);
471 get_be32(pb); /* max bit rate */
472 st->codec->bit_rate = get_be32(pb); /* bit rate */
473 get_be32(pb); /* max packet size */
474 get_be32(pb); /* avg packet size */
475 start_time = get_be32(pb); /* start time */
476 get_be32(pb); /* preroll */
477 duration = get_be32(pb); /* duration */
478 st->start_time = start_time;
479 st->duration = duration;
480 get_str8(pb, buf, sizeof(buf)); /* desc */
481 get_str8(pb, buf, sizeof(buf)); /* mimetype */
482 st->codec->codec_type = AVMEDIA_TYPE_DATA;
483 st->priv_data = ff_rm_alloc_rmstream();
484 if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
488 case MKTAG('D', 'A', 'T', 'A'):
491 /* unknown tag: skip it */
492 url_fskip(pb, tag_size - 10);
497 rm->nb_packets = get_be32(pb); /* number of packets */
498 if (!rm->nb_packets && (flags & 4))
499 rm->nb_packets = 3600 * 25;
500 get_be32(pb); /* next data header */
503 data_off = url_ftell(pb) - 18;
504 if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {
506 url_fseek(pb, data_off + 18, SEEK_SET);
512 static int get_num(ByteIOContext *pb, int *len)
524 return (n << 16) | n1;
528 /* multiple of 20 bytes for ra144 (ugly) */
529 #define RAW_PACKET_SIZE 1000
531 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
532 RMDemuxContext *rm = s->priv_data;
533 ByteIOContext *pb = s->pb;
535 uint32_t state=0xFFFFFFFF;
537 while(!url_feof(pb)){
539 *pos= url_ftell(pb) - 3;
540 if(rm->remaining_len > 0){
541 num= rm->current_stream;
542 len= rm->remaining_len;
543 *timestamp = AV_NOPTS_VALUE;
546 state= (state<<8) + get_byte(pb);
548 if(state == MKBETAG('I', 'N', 'D', 'X')){
549 int n_pkts, expected_len;
552 n_pkts = get_be32(pb);
553 expected_len = 20 + n_pkts * 14;
555 /* some files don't add index entries to chunk size... */
557 else if (len != expected_len)
558 av_log(s, AV_LOG_WARNING,
559 "Index size %d (%d pkts) is wrong, should be %d.\n",
560 len, n_pkts, expected_len);
561 len -= 14; // we already read part of the index header
565 } else if (state == MKBETAG('D','A','T','A')) {
566 av_log(s, AV_LOG_WARNING,
567 "DATA tag in middle of chunk, file may be broken.\n");
570 if(state > (unsigned)0xFFFF || state <= 12)
576 *timestamp = get_be32(pb);
577 get_byte(pb); /* reserved */
578 *flags = get_byte(pb); /* flags */
580 for(i=0;i<s->nb_streams;i++) {
585 if (i == s->nb_streams) {
587 /* skip packet if unknown number */
589 rm->remaining_len = 0;
599 static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
600 RMDemuxContext *rm, RMStream *vst,
601 AVPacket *pkt, int len, int *pseq)
603 int hdr, seq, pic_num, len2, pos;
606 hdr = get_byte(pb); len--;
609 if(type != 3){ // not frame as a part of packet
610 seq = get_byte(pb); len--;
612 if(type != 1){ // not whole frame
613 len2 = get_num(pb, &len);
614 pos = get_num(pb, &len);
615 pic_num = get_byte(pb); len--;
619 rm->remaining_len = len;
620 if(type&1){ // frame, not slice
621 if(type == 3) // frame as a part of packet
623 if(rm->remaining_len < len)
625 rm->remaining_len -= len;
626 if(av_new_packet(pkt, len + 9) < 0)
629 AV_WL32(pkt->data + 1, 1);
630 AV_WL32(pkt->data + 5, 0);
631 get_buffer(pb, pkt->data + 9, len);
634 //now we have to deal with single slice
637 if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
638 vst->slices = ((hdr & 0x3F) << 1) + 1;
639 vst->videobufsize = len2 + 8*vst->slices + 1;
640 av_free_packet(&vst->pkt); //FIXME this should be output.
641 if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
642 return AVERROR(ENOMEM);
643 vst->videobufpos = 8*vst->slices + 1;
645 vst->curpic_num = pic_num;
646 vst->pktpos = url_ftell(pb);
649 len = FFMIN(len, pos);
651 if(++vst->cur_slice > vst->slices)
653 AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
654 AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
655 if(vst->videobufpos + len > vst->videobufsize)
657 if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
659 vst->videobufpos += len;
660 rm->remaining_len-= len;
662 if(type == 2 || (vst->videobufpos) == vst->videobufsize){
663 vst->pkt.data[0] = vst->cur_slice-1;
667 if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
668 memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
669 vst->videobufpos - 1 - 8*vst->slices);
670 pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
671 pkt->pts = AV_NOPTS_VALUE;
672 pkt->pos = vst->pktpos;
681 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
686 if (st->codec->codec_id == CODEC_ID_AC3) {
688 for (j=0;j<pkt->size;j+=2) {
689 FFSWAP(int, ptr[0], ptr[1]);
696 * Perform 4-bit block reordering for SIPR data.
697 * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
699 void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
701 int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
703 for (n = 0; n < 38; n++) {
705 int i = bs * sipr_swaps[n][0];
706 int o = bs * sipr_swaps[n][1];
708 /* swap 4bit-nibbles of block 'i' with 'o' */
709 for (j = 0; j < bs; j++, i++, o++) {
710 int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
711 y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
713 buf[o >> 1] = (x << (4 * (o & 1))) |
714 (buf[o >> 1] & (0xF << (4 * !(o & 1))));
715 buf[i >> 1] = (y << (4 * (i & 1))) |
716 (buf[i >> 1] & (0xF << (4 * !(i & 1))));
722 ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
723 AVStream *st, RMStream *ast, int len, AVPacket *pkt,
724 int *seq, int flags, int64_t timestamp)
726 RMDemuxContext *rm = s->priv_data;
728 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
729 rm->current_stream= st->id;
730 if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
731 return -1; //got partial frame
732 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
733 if ((st->codec->codec_id == CODEC_ID_RA_288) ||
734 (st->codec->codec_id == CODEC_ID_COOK) ||
735 (st->codec->codec_id == CODEC_ID_ATRAC3) ||
736 (st->codec->codec_id == CODEC_ID_SIPR)) {
738 int sps = ast->sub_packet_size;
739 int cfs = ast->coded_framesize;
740 int h = ast->sub_packet_h;
741 int y = ast->sub_packet_cnt;
742 int w = ast->audio_framesize;
745 y = ast->sub_packet_cnt = 0;
747 ast->audiotimestamp = timestamp;
749 switch(st->codec->codec_id) {
750 case CODEC_ID_RA_288:
751 for (x = 0; x < h/2; x++)
752 get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
754 case CODEC_ID_ATRAC3:
756 for (x = 0; x < w/sps; x++)
757 get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
760 get_buffer(pb, ast->pkt.data + y * w, w);
764 if (++(ast->sub_packet_cnt) < h)
766 if (st->codec->codec_id == CODEC_ID_SIPR)
767 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
769 ast->sub_packet_cnt = 0;
770 rm->audio_stream_num = st->index;
771 rm->audio_pkt_cnt = h * w / st->codec->block_align;
772 } else if (st->codec->codec_id == CODEC_ID_AAC) {
774 rm->audio_stream_num = st->index;
775 ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
776 if (ast->sub_packet_cnt) {
777 for (x = 0; x < ast->sub_packet_cnt; x++)
778 ast->sub_packet_lengths[x] = get_be16(pb);
779 rm->audio_pkt_cnt = ast->sub_packet_cnt;
780 ast->audiotimestamp = timestamp;
784 av_get_packet(pb, pkt, len);
785 rm_ac3_swap_bytes(st, pkt);
788 av_get_packet(pb, pkt, len);
790 pkt->stream_index = st->index;
793 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
794 if(st->codec->codec_id == CODEC_ID_RV20){
795 int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
796 av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
798 seq |= (timestamp&~0x3FFF);
799 if(seq - timestamp > 0x2000) seq -= 0x4000;
800 if(seq - timestamp < -0x2000) seq += 0x4000;
807 pkt->flags |= AV_PKT_FLAG_KEY;
809 return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
813 ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
814 AVStream *st, RMStream *ast, AVPacket *pkt)
816 RMDemuxContext *rm = s->priv_data;
818 assert (rm->audio_pkt_cnt > 0);
820 if (st->codec->codec_id == CODEC_ID_AAC)
821 av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
823 av_new_packet(pkt, st->codec->block_align);
824 memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
825 (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
826 st->codec->block_align);
829 if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
830 ast->audiotimestamp = AV_NOPTS_VALUE;
831 pkt->flags = AV_PKT_FLAG_KEY;
834 pkt->stream_index = st->index;
836 return rm->audio_pkt_cnt;
839 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
841 RMDemuxContext *rm = s->priv_data;
843 int i, len, res, seq = 1;
844 int64_t timestamp, pos;
848 if (rm->audio_pkt_cnt) {
849 // If there are queued audio packet return them first
850 st = s->streams[rm->audio_stream_num];
851 ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
854 if (rm->old_format) {
859 timestamp = AV_NOPTS_VALUE;
860 len = !ast->audio_framesize ? RAW_PACKET_SIZE :
861 ast->coded_framesize * ast->sub_packet_h / 2;
862 flags = (seq++ == 1) ? 2 : 0;
863 pos = url_ftell(s->pb);
865 len=sync(s, ×tamp, &flags, &i, &pos);
870 if(len<0 || url_feof(s->pb))
873 res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
874 &seq, flags, timestamp);
875 if((flags&2) && (seq&0x7F) == 1)
876 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
881 if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))
882 || st->discard >= AVDISCARD_ALL){
891 static int rm_read_close(AVFormatContext *s)
895 for (i=0;i<s->nb_streams;i++)
896 ff_rm_free_rmstream(s->streams[i]->priv_data);
901 static int rm_probe(AVProbeData *p)
903 /* check file header */
904 if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
905 p->buf[2] == 'M' && p->buf[3] == 'F' &&
906 p->buf[4] == 0 && p->buf[5] == 0) ||
907 (p->buf[0] == '.' && p->buf[1] == 'r' &&
908 p->buf[2] == 'a' && p->buf[3] == 0xfd))
909 return AVPROBE_SCORE_MAX;
914 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
915 int64_t *ppos, int64_t pos_limit)
917 RMDemuxContext *rm = s->priv_data;
919 int stream_index2, flags, len, h;
924 return AV_NOPTS_VALUE;
926 url_fseek(s->pb, pos, SEEK_SET);
932 len=sync(s, &dts, &flags, &stream_index2, &pos);
934 return AV_NOPTS_VALUE;
936 st = s->streams[stream_index2];
937 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
938 h= get_byte(s->pb); len--;
940 seq = get_byte(s->pb); len--;
944 if((flags&2) && (seq&0x7F) == 1){
945 // av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
946 av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
947 if(stream_index2 == stream_index)
951 url_fskip(s->pb, len);
957 AVInputFormat rm_demuxer = {
959 NULL_IF_CONFIG_SMALL("RealMedia format"),
960 sizeof(RMDemuxContext),
969 AVInputFormat rdt_demuxer = {
971 NULL_IF_CONFIG_SMALL("RDT demuxer"),
972 sizeof(RMDemuxContext),