2 * ASF 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
23 #include "mpegaudio.h"
30 #define FRAME_HEADER_SIZE 17
31 // Fix Me! FRAME_HEADER_SIZE may be different.
33 static const GUID index_guid = {
34 0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
37 /**********************************/
43 #define PRINT_IF_GUID(g,cmp) \
44 if (!memcmp(g, &cmp, sizeof(GUID))) \
45 printf("(GUID: %s) ", #cmp)
47 static void print_guid(const GUID *g)
50 PRINT_IF_GUID(g, asf_header);
51 else PRINT_IF_GUID(g, file_header);
52 else PRINT_IF_GUID(g, stream_header);
53 else PRINT_IF_GUID(g, audio_stream);
54 else PRINT_IF_GUID(g, audio_conceal_none);
55 else PRINT_IF_GUID(g, video_stream);
56 else PRINT_IF_GUID(g, video_conceal_none);
57 else PRINT_IF_GUID(g, command_stream);
58 else PRINT_IF_GUID(g, comment_header);
59 else PRINT_IF_GUID(g, codec_comment_header);
60 else PRINT_IF_GUID(g, codec_comment1_header);
61 else PRINT_IF_GUID(g, data_header);
62 else PRINT_IF_GUID(g, index_guid);
63 else PRINT_IF_GUID(g, head1_guid);
64 else PRINT_IF_GUID(g, head2_guid);
65 else PRINT_IF_GUID(g, my_guid);
66 else PRINT_IF_GUID(g, ext_stream_header);
67 else PRINT_IF_GUID(g, extended_content_header);
68 else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
69 else PRINT_IF_GUID(g, ext_stream_audio_stream);
71 printf("(GUID: unknown) ");
73 printf(" 0x%02x,", (*g)[i]);
79 static void get_guid(ByteIOContext *s, GUID *g)
81 assert(sizeof(*g) == 16);
82 get_buffer(s, g, sizeof(*g));
86 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
95 if ((q - buf) < buf_size - 1)
103 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
109 PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
114 static int asf_probe(AVProbeData *pd)
116 /* check file header */
117 if (pd->buf_size <= 32)
120 if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
121 return AVPROBE_SCORE_MAX;
126 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
128 ASFContext *asf = s->priv_data;
130 ByteIOContext *pb = &s->pb;
137 if (memcmp(&g, &asf_header, sizeof(GUID)))
143 memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
146 gsize = get_le64(pb);
148 printf("%08"PRIx64": ", url_ftell(pb) - 24);
150 printf(" size=0x%"PRIx64"\n", gsize);
154 if (!memcmp(&g, &file_header, sizeof(GUID))) {
155 get_guid(pb, &asf->hdr.guid);
156 asf->hdr.file_size = get_le64(pb);
157 asf->hdr.create_time = get_le64(pb);
158 asf->nb_packets = get_le64(pb);
159 asf->hdr.send_time = get_le64(pb);
160 asf->hdr.play_time = get_le64(pb);
161 asf->hdr.preroll = get_le32(pb);
162 asf->hdr.ignore = get_le32(pb);
163 asf->hdr.flags = get_le32(pb);
164 asf->hdr.min_pktsize = get_le32(pb);
165 asf->hdr.max_pktsize = get_le32(pb);
166 asf->hdr.max_bitrate = get_le32(pb);
167 asf->packet_size = asf->hdr.max_pktsize;
168 } else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
169 int type, type_specific_size, sizeX;
173 int test_for_ext_stream_audio;
175 pos1 = url_ftell(pb);
177 st = av_new_stream(s, 0);
180 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
181 asf_st = av_mallocz(sizeof(ASFStream));
184 st->priv_data = asf_st;
185 st->start_time = asf->hdr.preroll;
186 if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
187 st->duration = asf->hdr.send_time /
188 (10000000 / 1000) - st->start_time;
192 test_for_ext_stream_audio = 0;
193 if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
194 type = CODEC_TYPE_AUDIO;
195 } else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
196 type = CODEC_TYPE_VIDEO;
197 } else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
198 type = CODEC_TYPE_UNKNOWN;
199 } else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
200 test_for_ext_stream_audio = 1;
201 type = CODEC_TYPE_UNKNOWN;
206 total_size = get_le64(pb);
207 type_specific_size = get_le32(pb);
209 st->id = get_le16(pb) & 0x7f; /* stream id */
210 // mapping of asf ID to AV stream ID;
211 asf->asfid2avid[st->id] = s->nb_streams - 1;
215 if (test_for_ext_stream_audio) {
217 if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
218 type = CODEC_TYPE_AUDIO;
228 st->codec->codec_type = type;
229 if (type == CODEC_TYPE_AUDIO) {
230 get_wav_header(pb, st->codec, type_specific_size);
231 st->need_parsing = 1;
232 /* We have to init the frame size at some point .... */
233 pos2 = url_ftell(pb);
234 if (gsize > (pos2 + 8 - pos1 + 24)) {
235 asf_st->ds_span = get_byte(pb);
236 asf_st->ds_packet_size = get_le16(pb);
237 asf_st->ds_chunk_size = get_le16(pb);
238 get_le16(pb); //ds_data_size
239 get_byte(pb); //ds_silence_data
241 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
242 // asf_st->ds_packet_size, asf_st->ds_chunk_size,
243 // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
244 if (asf_st->ds_span > 1) {
245 if (!asf_st->ds_chunk_size
246 || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
247 || asf_st->ds_packet_size % asf_st->ds_chunk_size)
248 asf_st->ds_span = 0; // disable descrambling
250 switch (st->codec->codec_id) {
252 st->codec->frame_size = MPA_FRAME_SIZE;
254 case CODEC_ID_PCM_S16LE:
255 case CODEC_ID_PCM_S16BE:
256 case CODEC_ID_PCM_U16LE:
257 case CODEC_ID_PCM_U16BE:
258 case CODEC_ID_PCM_S8:
259 case CODEC_ID_PCM_U8:
260 case CODEC_ID_PCM_ALAW:
261 case CODEC_ID_PCM_MULAW:
262 st->codec->frame_size = 1;
265 /* This is probably wrong, but it prevents a crash later */
266 st->codec->frame_size = 1;
269 } else if (type == CODEC_TYPE_VIDEO) {
273 size = get_le16(pb); /* size */
274 sizeX= get_le32(pb); /* size */
275 st->codec->width = get_le32(pb);
276 st->codec->height = get_le32(pb);
277 /* not available for asf */
278 get_le16(pb); /* panes */
279 st->codec->bits_per_sample = get_le16(pb); /* depth */
282 // av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
285 st->codec->extradata_size = size - 40;
286 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
287 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
290 /* Extract palette from extradata if bpp <= 8 */
291 /* This code assumes that extradata contains only palette */
292 /* This is true for all paletted codecs implemented in ffmpeg */
293 if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
294 st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
295 #ifdef WORDS_BIGENDIAN
296 for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
297 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
299 memcpy(st->codec->palctrl->palette, st->codec->extradata,
300 FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
302 st->codec->palctrl->palette_changed = 1;
305 st->codec->codec_tag = tag1;
306 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
307 if(tag1 == MKTAG('D', 'V', 'R', ' '))
308 st->need_parsing = 1;
310 pos2 = url_ftell(pb);
311 url_fskip(pb, gsize - (pos2 - pos1 + 24));
312 } else if (!memcmp(&g, &data_header, sizeof(GUID))) {
313 asf->data_object_offset = url_ftell(pb);
314 // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
315 if (!(asf->hdr.flags & 0x01) && gsize != (uint64_t)-1 && gsize >= 24) {
316 asf->data_object_size = gsize - 24;
318 asf->data_object_size = (uint64_t)-1;
321 } else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
322 int len1, len2, len3, len4, len5;
329 get_str16_nolen(pb, len1, s->title , sizeof(s->title));
330 get_str16_nolen(pb, len2, s->author , sizeof(s->author));
331 get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
332 get_str16_nolen(pb, len4, s->comment , sizeof(s->comment));
334 } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
337 desc_count = get_le16(pb);
338 for(i=0;i<desc_count;i++)
340 int name_len,value_type,value_len;
341 uint64_t value_num = 0;
344 name_len = get_le16(pb);
345 get_str16_nolen(pb, name_len, name, sizeof(name));
346 value_type = get_le16(pb);
347 value_len = get_le16(pb);
348 if ((value_type == 0) || (value_type == 1)) // unicode or byte
350 if (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
351 else if(!strcmp(name,"WM/Genre" )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
352 else url_fskip(pb, value_len);
354 if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
356 if (value_type==2) value_num = get_le32(pb);
357 if (value_type==3) value_num = get_le32(pb);
358 if (value_type==4) value_num = get_le64(pb);
359 if (value_type==5) value_num = get_le16(pb);
360 if (!strcmp(name,"WM/Track" )) s->track = value_num + 1;
361 if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
364 } else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
365 int ext_len, payload_ext_ct, stream_ct;
368 pos_ex_st = url_ftell(pb);
383 stream_ct = get_le16(pb);
384 payload_ext_ct = get_le16(pb);
386 for (i=0; i<stream_ct; i++){
388 ext_len = get_le16(pb);
389 url_fseek(pb, ext_len, SEEK_CUR);
392 for (i=0; i<payload_ext_ct; i++){
395 ext_len=get_le32(pb);
396 url_fseek(pb, ext_len, SEEK_CUR);
399 // there could be a optional stream properties object to follow
400 // if so the next iteration will pick it up
401 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
407 } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
417 num = get_le16(pb); /* stream number */
418 get_str16(pb, str, sizeof(str));
419 get_str16(pb, str, sizeof(str));
424 if ((q - tag) < sizeof(tag) - 1)
431 } else if (url_feof(pb)) {
434 url_fseek(pb, gsize - 24, SEEK_CUR);
443 asf->data_offset = url_ftell(pb);
444 asf->packet_size_left = 0;
449 for(i=0;i<s->nb_streams;i++) {
450 AVStream *st = s->streams[i];
452 av_free(st->priv_data);
453 av_free(st->codec->extradata);
460 #define DO_2BITS(bits, var, defval) \
463 case 3: var = get_le32(pb); rsize += 4; break; \
464 case 2: var = get_le16(pb); rsize += 2; break; \
465 case 1: var = get_byte(pb); rsize++; break; \
466 default: var = defval; break; \
471 * @return <0 in case of an error
473 static int asf_get_packet(AVFormatContext *s)
475 ASFContext *asf = s->priv_data;
476 ByteIOContext *pb = &s->pb;
477 uint32_t packet_length, padsize;
484 av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
486 if ((c & 0x0f) == 2) { // always true for now
487 if (get_le16(pb) != 0) {
489 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
495 printf("ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
499 asf->packet_flags = get_byte(pb);
500 asf->packet_property = get_byte(pb);
502 DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
503 DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
504 DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
506 //the following checks prevent overflows and infinite loops
507 if(packet_length >= (1U<<29)){
508 av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
511 if(padsize >= packet_length){
512 av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
516 asf->packet_timestamp = get_le32(pb);
517 get_le16(pb); /* duration */
518 // rsize has at least 11 bytes which have to be present
520 if (asf->packet_flags & 0x01) {
521 asf->packet_segsizetype = get_byte(pb); rsize++;
522 asf->packet_segments = asf->packet_segsizetype & 0x3f;
524 asf->packet_segments = 1;
525 asf->packet_segsizetype = 0x80;
527 asf->packet_size_left = packet_length - padsize - rsize;
528 if (packet_length < asf->hdr.min_pktsize)
529 padsize += asf->hdr.min_pktsize - packet_length;
530 asf->packet_padsize = padsize;
532 printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
539 * @return <0 if error
541 static int asf_read_frame_header(AVFormatContext *s){
542 ASFContext *asf = s->priv_data;
543 ByteIOContext *pb = &s->pb;
545 int num = get_byte(pb);
547 asf->packet_segments--;
548 asf->packet_key_frame = num >> 7;
549 asf->stream_index = asf->asfid2avid[num & 0x7f];
550 // sequence should be ignored!
551 DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
552 DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
553 DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
554 //printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
555 if (asf->packet_replic_size >= 8) {
556 asf->packet_obj_size = get_le32(pb);
557 if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
558 av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
561 asf->packet_frag_timestamp = get_le32(pb); // timestamp
562 url_fskip(pb, asf->packet_replic_size - 8);
563 rsize += asf->packet_replic_size; // FIXME - check validity
564 } else if (asf->packet_replic_size==1){
565 // multipacket - frag_offset is begining timestamp
566 asf->packet_time_start = asf->packet_frag_offset;
567 asf->packet_frag_offset = 0;
568 asf->packet_frag_timestamp = asf->packet_timestamp;
570 asf->packet_time_delta = get_byte(pb);
572 }else if(asf->packet_replic_size!=0){
573 av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
576 if (asf->packet_flags & 0x01) {
577 DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
578 if(asf->packet_frag_size > asf->packet_size_left - rsize){
579 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
582 //printf("Fragsize %d\n", asf->packet_frag_size);
584 asf->packet_frag_size = asf->packet_size_left - rsize;
585 //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
587 if (asf->packet_replic_size == 1) {
588 asf->packet_multi_size = asf->packet_frag_size;
589 if (asf->packet_multi_size > asf->packet_size_left)
592 asf->packet_size_left -= rsize;
593 //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
598 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
600 ASFContext *asf = s->priv_data;
601 ASFStream *asf_st = 0;
602 ByteIOContext *pb = &s->pb;
607 if (asf->packet_size_left < FRAME_HEADER_SIZE
608 || asf->packet_segments < 1) {
609 //asf->packet_size_left <= asf->packet_padsize) {
610 int ret = asf->packet_size_left + asf->packet_padsize;
611 //printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
616 ret= (url_ftell(&s->pb) - s->data_offset) % asf->packet_size;
617 if(asf->hdr.max_pktsize == asf->hdr.min_pktsize && ret){
618 av_log(s, AV_LOG_ERROR, "packet end missaligned skiping %d\n", ret);
619 url_fskip(pb, asf->packet_size - ret);
622 asf->packet_pos= url_ftell(&s->pb);
623 if (asf->data_object_size != (uint64_t)-1 &&
624 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
625 return AVERROR_IO; /* Do not exceed the size of the data object */
626 ret = asf_get_packet(s);
627 //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
629 assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
630 asf->packet_time_start = 0;
633 if (asf->packet_time_start == 0) {
634 if(asf_read_frame_header(s) < 0){
635 asf->packet_segments= 0;
638 if (asf->stream_index < 0
639 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
640 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
642 asf->packet_time_start = 0;
643 /* unhandled packet (should not happen) */
644 url_fskip(pb, asf->packet_frag_size);
645 asf->packet_size_left -= asf->packet_frag_size;
646 if(asf->stream_index < 0)
647 av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
650 asf->asf_st = s->streams[asf->stream_index]->priv_data;
652 asf_st = asf->asf_st;
654 if (asf->packet_replic_size == 1) {
655 // frag_offset is here used as the begining timestamp
656 asf->packet_frag_timestamp = asf->packet_time_start;
657 asf->packet_time_start += asf->packet_time_delta;
658 asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
659 asf->packet_size_left--;
660 asf->packet_multi_size--;
661 if (asf->packet_multi_size < asf->packet_obj_size)
663 asf->packet_time_start = 0;
664 url_fskip(pb, asf->packet_multi_size);
665 asf->packet_size_left -= asf->packet_multi_size;
668 asf->packet_multi_size -= asf->packet_obj_size;
669 //printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
671 if (asf_st->pkt.size != asf->packet_obj_size) { //FIXME is this condition sufficient?
672 if(asf_st->pkt.data){
673 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
674 asf_st->frag_offset = 0;
675 av_free_packet(&asf_st->pkt);
678 av_new_packet(&asf_st->pkt, asf->packet_obj_size);
679 asf_st->seq = asf->packet_seq;
680 asf_st->pkt.pts = asf->packet_frag_timestamp;
681 asf_st->pkt.stream_index = asf->stream_index;
683 asf_st->packet_pos= asf->packet_pos;
684 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
685 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
686 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
687 if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
688 asf->packet_key_frame = 1;
689 if (asf->packet_key_frame)
690 asf_st->pkt.flags |= PKT_FLAG_KEY;
694 //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
695 // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
696 // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
697 asf->packet_size_left -= asf->packet_frag_size;
698 if (asf->packet_size_left < 0)
701 if( asf->packet_frag_offset >= asf_st->pkt.size
702 || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
703 av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
704 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
708 get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
709 asf->packet_frag_size);
710 asf_st->frag_offset += asf->packet_frag_size;
711 /* test if whole packet is read */
712 if (asf_st->frag_offset == asf_st->pkt.size) {
714 if (asf_st->ds_span > 1) {
715 if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
716 av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span\n");
718 /* packet descrambling */
719 uint8_t *newdata = av_malloc(asf_st->pkt.size);
722 while (offset < asf_st->pkt.size) {
723 int off = offset / asf_st->ds_chunk_size;
724 int row = off / asf_st->ds_span;
725 int col = off % asf_st->ds_span;
726 int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
727 //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
729 assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
730 assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
731 memcpy(newdata + offset,
732 asf_st->pkt.data + idx * asf_st->ds_chunk_size,
733 asf_st->ds_chunk_size);
734 offset += asf_st->ds_chunk_size;
736 av_free(asf_st->pkt.data);
737 asf_st->pkt.data = newdata;
741 asf_st->frag_offset = 0;
743 //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
744 asf_st->pkt.size = 0;
745 asf_st->pkt.data = 0;
746 break; // packet completed
752 static int asf_read_close(AVFormatContext *s)
756 for(i=0;i<s->nb_streams;i++) {
757 AVStream *st = s->streams[i];
758 av_free(st->priv_data);
759 av_free(st->codec->palctrl);
764 // Added to support seeking after packets have been read
765 // If information is not reset, read_packet fails due to
766 // leftover information from previous reads
767 static void asf_reset_header(AVFormatContext *s)
769 ASFContext *asf = s->priv_data;
773 asf->packet_nb_frames = 0;
774 asf->packet_size_left = 0;
775 asf->packet_segments = 0;
776 asf->packet_flags = 0;
777 asf->packet_property = 0;
778 asf->packet_timestamp = 0;
779 asf->packet_segsizetype = 0;
780 asf->packet_segments = 0;
782 asf->packet_replic_size = 0;
783 asf->packet_key_frame = 0;
784 asf->packet_padsize = 0;
785 asf->packet_frag_offset = 0;
786 asf->packet_frag_size = 0;
787 asf->packet_frag_timestamp = 0;
788 asf->packet_multi_size = 0;
789 asf->packet_obj_size = 0;
790 asf->packet_time_delta = 0;
791 asf->packet_time_start = 0;
793 for(i=0; i<s->nb_streams; i++){
794 asf_st= s->streams[i]->priv_data;
795 av_free_packet(&asf_st->pkt);
796 asf_st->frag_offset=0;
802 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
804 ASFContext *asf = s->priv_data;
805 AVPacket pkt1, *pkt = &pkt1;
810 int64_t start_pos[s->nb_streams];
812 for(i=0; i<s->nb_streams; i++){
816 pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
818 url_fseek(&s->pb, pos, SEEK_SET);
820 //printf("asf_read_pts\n");
823 if (av_read_frame(s, pkt) < 0){
824 av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
825 return AV_NOPTS_VALUE;
831 if(pkt->flags&PKT_FLAG_KEY){
832 i= pkt->stream_index;
834 asf_st= s->streams[i]->priv_data;
836 assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
837 pos= asf_st->packet_pos;
839 av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
840 start_pos[i]= asf_st->packet_pos + 1;
842 if(pkt->stream_index == stream_index)
848 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
853 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
856 ASFContext *asf = s->priv_data;
857 int64_t gsize, itime;
858 int64_t pos, current_pos, index_pts;
862 current_pos = url_ftell(&s->pb);
864 url_fseek(&s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
865 get_guid(&s->pb, &g);
866 if (!memcmp(&g, &index_guid, sizeof(GUID))) {
867 gsize = get_le64(&s->pb);
868 get_guid(&s->pb, &g);
869 itime=get_le64(&s->pb);
870 pct=get_le32(&s->pb);
871 ict=get_le32(&s->pb);
872 av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
875 int pktnum=get_le32(&s->pb);
876 int pktct =get_le16(&s->pb);
877 av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
879 pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
880 index_pts=av_rescale(itime, i, 10000);
882 av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
886 url_fseek(&s->pb, current_pos, SEEK_SET);
889 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
891 ASFContext *asf = s->priv_data;
892 AVStream *st = s->streams[stream_index];
896 if (asf->packet_size <= 0)
899 if (!asf->index_read)
900 asf_build_simple_index(s, stream_index);
902 if(!(asf->index_read && st->index_entries)){
903 if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
906 index= av_index_search_timestamp(st, pts, flags);
910 /* find the position */
911 pos = st->index_entries[index].pos;
912 pts = st->index_entries[index].timestamp;
914 // various attempts to find key frame have failed so far
915 // asf_reset_header(s);
916 // url_fseek(&s->pb, pos, SEEK_SET);
918 // for(i=0;i<16;i++){
919 // pos = url_ftell(&s->pb);
920 // if (av_read_frame(s, &pkt) < 0){
921 // av_log(s, AV_LOG_INFO, "seek failed\n");
924 // asf_st = s->streams[stream_index]->priv_data;
925 // pos += st->parser->frame_offset;
927 // if (pkt.size > b) {
932 // av_free_packet(&pkt);
936 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
937 url_fseek(&s->pb, pos, SEEK_SET);
943 AVInputFormat asf_demuxer = {