/* * ASF compatible decoder. * Copyright (c) 2000, 2001 Fabrice Bellard. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "avformat.h" #include "avi.h" #include "mpegaudio.h" #include "asf.h" #undef NDEBUG #include <assert.h> #define FRAME_HEADER_SIZE 17 // Fix Me! FRAME_HEADER_SIZE may be different. static const GUID index_guid = { 0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb }, }; /**********************************/ /* decoding */ //#define DEBUG #ifdef DEBUG #define PRINT_IF_GUID(g,cmp) \ if (!memcmp(g, &cmp, sizeof(GUID))) \ printf("(GUID: %s) ", #cmp) static void print_guid(const GUID *g) { int i; PRINT_IF_GUID(g, asf_header); else PRINT_IF_GUID(g, file_header); else PRINT_IF_GUID(g, stream_header); else PRINT_IF_GUID(g, audio_stream); else PRINT_IF_GUID(g, audio_conceal_none); else PRINT_IF_GUID(g, video_stream); else PRINT_IF_GUID(g, video_conceal_none); else PRINT_IF_GUID(g, comment_header); else PRINT_IF_GUID(g, codec_comment_header); else PRINT_IF_GUID(g, codec_comment1_header); else PRINT_IF_GUID(g, data_header); else PRINT_IF_GUID(g, index_guid); else PRINT_IF_GUID(g, head1_guid); else PRINT_IF_GUID(g, head2_guid); else PRINT_IF_GUID(g, my_guid); else printf("(GUID: unknown) "); printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3); for(i=0;i<8;i++) printf(" 0x%02x,", g->v4[i]); printf("}\n"); } #undef PRINT_IF_GUID(g,cmp) #endif static void get_guid(ByteIOContext *s, GUID *g) { int i; g->v1 = get_le32(s); g->v2 = get_le16(s); g->v3 = get_le16(s); for(i=0;i<8;i++) g->v4[i] = get_byte(s); } #if 0 static void get_str16(ByteIOContext *pb, char *buf, int buf_size) { int len, c; char *q; len = get_le16(pb); q = buf; while (len > 0) { c = get_le16(pb); if ((q - buf) < buf_size - 1) *q++ = c; len--; } *q = '\0'; } #endif static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size) { int c; char *q; q = buf; while (len > 0) { c = get_le16(pb); if ((q - buf) < buf_size - 1) *q++ = c; len-=2; } *q = '\0'; } static int asf_probe(AVProbeData *pd) { GUID g; const unsigned char *p; int i; /* check file header */ if (pd->buf_size <= 32) return 0; p = pd->buf; g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); p += 4; g.v2 = p[0] | (p[1] << 8); p += 2; g.v3 = p[0] | (p[1] << 8); p += 2; for(i=0;i<8;i++) g.v4[i] = *p++; if (!memcmp(&g, &asf_header, sizeof(GUID))) return AVPROBE_SCORE_MAX; else return 0; } static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap) { ASFContext *asf = s->priv_data; GUID g; ByteIOContext *pb = &s->pb; AVStream *st; ASFStream *asf_st; int size, i; int64_t gsize; get_guid(pb, &g); if (memcmp(&g, &asf_header, sizeof(GUID))) goto fail; get_le64(pb); get_le32(pb); get_byte(pb); get_byte(pb); memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid)); for(;;) { get_guid(pb, &g); gsize = get_le64(pb); #ifdef DEBUG printf("%08Lx: ", url_ftell(pb) - 24); print_guid(&g); printf(" size=0x%Lx\n", gsize); #endif if (gsize < 24) goto fail; if (!memcmp(&g, &file_header, sizeof(GUID))) { get_guid(pb, &asf->hdr.guid); asf->hdr.file_size = get_le64(pb); asf->hdr.create_time = get_le64(pb); asf->hdr.packets_count = get_le64(pb); asf->hdr.play_time = get_le64(pb); asf->hdr.send_time = get_le64(pb); asf->hdr.preroll = get_le32(pb); asf->hdr.ignore = get_le32(pb); asf->hdr.flags = get_le32(pb); asf->hdr.min_pktsize = get_le32(pb); asf->hdr.max_pktsize = get_le32(pb); asf->hdr.max_bitrate = get_le32(pb); asf->packet_size = asf->hdr.max_pktsize; asf->nb_packets = asf->hdr.packets_count; } else if (!memcmp(&g, &stream_header, sizeof(GUID))) { int type, total_size, type_specific_size, sizeX; unsigned int tag1; int64_t pos1, pos2; pos1 = url_ftell(pb); st = av_new_stream(s, 0); if (!st) goto fail; av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */ asf_st = av_mallocz(sizeof(ASFStream)); if (!asf_st) goto fail; st->priv_data = asf_st; st->start_time = asf->hdr.preroll; st->duration = asf->hdr.send_time / (10000000 / 1000) - st->start_time; get_guid(pb, &g); if (!memcmp(&g, &audio_stream, sizeof(GUID))) { type = CODEC_TYPE_AUDIO; } else if (!memcmp(&g, &video_stream, sizeof(GUID))) { type = CODEC_TYPE_VIDEO; } else { goto fail; } get_guid(pb, &g); total_size = get_le64(pb); type_specific_size = get_le32(pb); get_le32(pb); st->id = get_le16(pb) & 0x7f; /* stream id */ // mapping of asf ID to AV stream ID; asf->asfid2avid[st->id] = s->nb_streams - 1; get_le32(pb); st->codec.codec_type = type; if (type == CODEC_TYPE_AUDIO) { get_wav_header(pb, &st->codec, type_specific_size); st->need_parsing = 1; /* We have to init the frame size at some point .... */ pos2 = url_ftell(pb); if (gsize > (pos2 + 8 - pos1 + 24)) { asf_st->ds_span = get_byte(pb); asf_st->ds_packet_size = get_le16(pb); asf_st->ds_chunk_size = get_le16(pb); asf_st->ds_data_size = get_le16(pb); asf_st->ds_silence_data = get_byte(pb); } //printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n", // asf_st->ds_packet_size, asf_st->ds_chunk_size, // asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data); if (asf_st->ds_span > 1) { if (!asf_st->ds_chunk_size || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)) asf_st->ds_span = 0; // disable descrambling } switch (st->codec.codec_id) { case CODEC_ID_MP3: st->codec.frame_size = MPA_FRAME_SIZE; break; case CODEC_ID_PCM_S16LE: case CODEC_ID_PCM_S16BE: case CODEC_ID_PCM_U16LE: case CODEC_ID_PCM_U16BE: case CODEC_ID_PCM_S8: case CODEC_ID_PCM_U8: case CODEC_ID_PCM_ALAW: case CODEC_ID_PCM_MULAW: st->codec.frame_size = 1; break; default: /* This is probably wrong, but it prevents a crash later */ st->codec.frame_size = 1; break; } } else { get_le32(pb); get_le32(pb); get_byte(pb); size = get_le16(pb); /* size */ sizeX= get_le32(pb); /* size */ st->codec.width = get_le32(pb); st->codec.height = get_le32(pb); /* not available for asf */ get_le16(pb); /* panes */ st->codec.bits_per_sample = get_le16(pb); /* depth */ tag1 = get_le32(pb); url_fskip(pb, 20); // av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX); size= sizeX; if (size > 40) { st->codec.extradata_size = size - 40; st->codec.extradata = av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); get_buffer(pb, st->codec.extradata, st->codec.extradata_size); } /* Extract palette from extradata if bpp <= 8 */ /* This code assumes that extradata contains only palette */ /* This is true for all paletted codecs implemented in ffmpeg */ if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) { st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl)); #ifdef WORDS_BIGENDIAN for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++) st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]); #else memcpy(st->codec.palctrl->palette, st->codec.extradata, FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)); #endif st->codec.palctrl->palette_changed = 1; } st->codec.codec_tag = tag1; st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1); if(tag1 == MKTAG('D', 'V', 'R', ' ')) st->need_parsing = 1; } pos2 = url_ftell(pb); url_fskip(pb, gsize - (pos2 - pos1 + 24)); } else if (!memcmp(&g, &data_header, sizeof(GUID))) { break; } else if (!memcmp(&g, &comment_header, sizeof(GUID))) { int len1, len2, len3, len4, len5; len1 = get_le16(pb); len2 = get_le16(pb); len3 = get_le16(pb); len4 = get_le16(pb); len5 = get_le16(pb); get_str16_nolen(pb, len1, s->title, sizeof(s->title)); get_str16_nolen(pb, len2, s->author, sizeof(s->author)); get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright)); get_str16_nolen(pb, len4, s->comment, sizeof(s->comment)); url_fskip(pb, len5); } else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) { int desc_count, i; desc_count = get_le16(pb); for(i=0;i<desc_count;i++) { int name_len,value_type,value_len,value_num = 0; char *name, *value; name_len = get_le16(pb); name = (char *)av_mallocz(name_len); get_str16_nolen(pb, name_len, name, name_len); value_type = get_le16(pb); value_len = get_le16(pb); if ((value_type == 0) || (value_type == 1)) // unicode or byte { value = (char *)av_mallocz(value_len); get_str16_nolen(pb, value_len, value, value_len); if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); } av_free(value); } if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD { if (value_type==2) value_num = get_le32(pb); if (value_type==3) value_num = get_le32(pb); if (value_type==4) value_num = get_le64(pb); if (value_type==5) value_num = get_le16(pb); if (strcmp(name,"WM/Track")==0) s->track = value_num + 1; if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num; } av_free(name); } #if 0 } else if (!memcmp(&g, &head1_guid, sizeof(GUID))) { int v1, v2; get_guid(pb, &g); v1 = get_le32(pb); v2 = get_le16(pb); } else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) { int len, v1, n, num; char str[256], *q; char tag[16]; get_guid(pb, &g); print_guid(&g); n = get_le32(pb); for(i=0;i<n;i++) { num = get_le16(pb); /* stream number */ get_str16(pb, str, sizeof(str)); get_str16(pb, str, sizeof(str)); len = get_le16(pb); q = tag; while (len > 0) { v1 = get_byte(pb); if ((q - tag) < sizeof(tag) - 1) *q++ = v1; len--; } *q = '\0'; } #endif } else if (url_feof(pb)) { goto fail; } else { url_fseek(pb, gsize - 24, SEEK_CUR); } } get_guid(pb, &g); get_le64(pb); get_byte(pb); get_byte(pb); if (url_feof(pb)) goto fail; asf->data_offset = url_ftell(pb); asf->packet_size_left = 0; return 0; fail: for(i=0;i<s->nb_streams;i++) { AVStream *st = s->streams[i]; if (st) { av_free(st->priv_data); av_free(st->codec.extradata); } av_free(st); } return -1; } #define DO_2BITS(bits, var, defval) \ switch (bits & 3) \ { \ case 3: var = get_le32(pb); rsize += 4; break; \ case 2: var = get_le16(pb); rsize += 2; break; \ case 1: var = get_byte(pb); rsize++; break; \ default: var = defval; break; \ } static int asf_get_packet(AVFormatContext *s) { ASFContext *asf = s->priv_data; ByteIOContext *pb = &s->pb; uint32_t packet_length, padsize; int rsize = 9; int c; if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size) return -1; assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0); c = get_byte(pb); if (c != 0x82) { if (!url_feof(pb)) av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%lld\n", c, url_ftell(pb)); } if ((c & 0x0f) == 2) { // always true for now if (get_le16(pb) != 0) { if (!url_feof(pb)) av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n"); return AVERROR_IO; } rsize+=2; /* }else{ if (!url_feof(pb)) printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb)); return AVERROR_IO;*/ } asf->packet_flags = get_byte(pb); asf->packet_property = get_byte(pb); DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size); DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length asf->packet_timestamp = get_le32(pb); get_le16(pb); /* duration */ // rsize has at least 11 bytes which have to be present if (asf->packet_flags & 0x01) { asf->packet_segsizetype = get_byte(pb); rsize++; asf->packet_segments = asf->packet_segsizetype & 0x3f; } else { asf->packet_segments = 1; asf->packet_segsizetype = 0x80; } asf->packet_size_left = packet_length - padsize - rsize; if (packet_length < asf->hdr.min_pktsize) padsize += asf->hdr.min_pktsize - packet_length; asf->packet_padsize = padsize; #ifdef DEBUG printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left); #endif return 0; } static int asf_read_packet(AVFormatContext *s, AVPacket *pkt) { ASFContext *asf = s->priv_data; ASFStream *asf_st = 0; ByteIOContext *pb = &s->pb; //static int pc = 0; for (;;) { int rsize = 0; if (asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1) { //asf->packet_size_left <= asf->packet_padsize) { int ret = asf->packet_size_left + asf->packet_padsize; //printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb)); /* fail safe */ url_fskip(pb, ret); asf->packet_pos= url_ftell(&s->pb); ret = asf_get_packet(s); //printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++); if (ret < 0 || url_feof(pb)) return AVERROR_IO; asf->packet_time_start = 0; continue; } if (asf->packet_time_start == 0) { /* read frame header */ int num = get_byte(pb); asf->packet_segments--; rsize++; asf->packet_key_frame = (num & 0x80) >> 7; asf->stream_index = asf->asfid2avid[num & 0x7f]; // sequence should be ignored! DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0); DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0); DO_2BITS(asf->packet_property, asf->packet_replic_size, 0); //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); if (asf->packet_replic_size > 1) { assert(asf->packet_replic_size >= 8); // it should be always at least 8 bytes - FIXME validate asf->packet_obj_size = get_le32(pb); asf->packet_frag_timestamp = get_le32(pb); // timestamp if (asf->packet_replic_size > 8) url_fskip(pb, asf->packet_replic_size - 8); rsize += asf->packet_replic_size; // FIXME - check validity } else if (asf->packet_replic_size==1){ // multipacket - frag_offset is begining timestamp asf->packet_time_start = asf->packet_frag_offset; asf->packet_frag_offset = 0; asf->packet_frag_timestamp = asf->packet_timestamp; asf->packet_time_delta = get_byte(pb); rsize++; }else{ assert(asf->packet_replic_size==0); } if (asf->packet_flags & 0x01) { DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal #undef DO_2BITS //printf("Fragsize %d\n", asf->packet_frag_size); } else { asf->packet_frag_size = asf->packet_size_left - rsize; //printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize); } if (asf->packet_replic_size == 1) { asf->packet_multi_size = asf->packet_frag_size; if (asf->packet_multi_size > asf->packet_size_left) { asf->packet_segments = 0; continue; } } asf->packet_size_left -= rsize; //printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize); if (asf->stream_index < 0 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY) ) { asf->packet_time_start = 0; /* unhandled packet (should not happen) */ url_fskip(pb, asf->packet_frag_size); asf->packet_size_left -= asf->packet_frag_size; if(asf->stream_index < 0) av_log(s, AV_LOG_ERROR, "ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f); continue; } asf->asf_st = s->streams[asf->stream_index]->priv_data; } asf_st = asf->asf_st; if ((asf->packet_frag_offset != asf_st->frag_offset || (asf->packet_frag_offset && asf->packet_seq != asf_st->seq)) // seq should be ignored ) { /* cannot continue current packet: free it */ // FIXME better check if packet was already allocated av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d o:%d - %d %d %d fl:%d\n", asf_st->pkt.size, asf->packet_obj_size, asf->packet_frag_offset, asf_st->frag_offset, asf->packet_seq, asf_st->seq, asf->packet_frag_size); if (asf_st->pkt.size) av_free_packet(&asf_st->pkt); asf_st->frag_offset = 0; if (asf->packet_frag_offset != 0) { url_fskip(pb, asf->packet_frag_size); av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size); asf->packet_size_left -= asf->packet_frag_size; continue; } } if (asf->packet_replic_size == 1) { // frag_offset is here used as the begining timestamp asf->packet_frag_timestamp = asf->packet_time_start; asf->packet_time_start += asf->packet_time_delta; asf->packet_obj_size = asf->packet_frag_size = get_byte(pb); asf->packet_size_left--; asf->packet_multi_size--; if (asf->packet_multi_size < asf->packet_obj_size) { asf->packet_time_start = 0; url_fskip(pb, asf->packet_multi_size); asf->packet_size_left -= asf->packet_multi_size; continue; } asf->packet_multi_size -= asf->packet_obj_size; //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); } if (asf_st->frag_offset == 0) { /* new packet */ av_new_packet(&asf_st->pkt, asf->packet_obj_size); asf_st->seq = asf->packet_seq; asf_st->pkt.pts = asf->packet_frag_timestamp; asf_st->pkt.stream_index = asf->stream_index; asf_st->packet_pos= asf->packet_pos; //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n", //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY, //s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size); if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO) asf->packet_key_frame = 1; if (asf->packet_key_frame) asf_st->pkt.flags |= PKT_FLAG_KEY; } /* read data */ //printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n", // asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset, // asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data); asf->packet_size_left -= asf->packet_frag_size; if (asf->packet_size_left < 0) continue; get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset, asf->packet_frag_size); asf_st->frag_offset += asf->packet_frag_size; /* test if whole packet is read */ if (asf_st->frag_offset == asf_st->pkt.size) { /* return packet */ if (asf_st->ds_span > 1) { /* packet descrambling */ char* newdata = av_malloc(asf_st->pkt.size); if (newdata) { int offset = 0; while (offset < asf_st->pkt.size) { int off = offset / asf_st->ds_chunk_size; int row = off / asf_st->ds_span; int col = off % asf_st->ds_span; int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size; //printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx); memcpy(newdata + offset, asf_st->pkt.data + idx * asf_st->ds_chunk_size, asf_st->ds_chunk_size); offset += asf_st->ds_chunk_size; } av_free(asf_st->pkt.data); asf_st->pkt.data = newdata; } } asf_st->frag_offset = 0; memcpy(pkt, &asf_st->pkt, sizeof(AVPacket)); //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size); asf_st->pkt.size = 0; asf_st->pkt.data = 0; break; // packet completed } } return 0; } static int asf_read_close(AVFormatContext *s) { int i; for(i=0;i<s->nb_streams;i++) { AVStream *st = s->streams[i]; av_free(st->priv_data); av_free(st->codec.extradata); av_free(st->codec.palctrl); } return 0; } // Added to support seeking after packets have been read // If information is not reset, read_packet fails due to // leftover information from previous reads static void asf_reset_header(AVFormatContext *s) { ASFContext *asf = s->priv_data; ASFStream *asf_st; int i; asf->packet_nb_frames = 0; asf->packet_timestamp_start = -1; asf->packet_timestamp_end = -1; asf->packet_size_left = 0; asf->packet_segments = 0; asf->packet_flags = 0; asf->packet_property = 0; asf->packet_timestamp = 0; asf->packet_segsizetype = 0; asf->packet_segments = 0; asf->packet_seq = 0; asf->packet_replic_size = 0; asf->packet_key_frame = 0; asf->packet_padsize = 0; asf->packet_frag_offset = 0; asf->packet_frag_size = 0; asf->packet_frag_timestamp = 0; asf->packet_multi_size = 0; asf->packet_obj_size = 0; asf->packet_time_delta = 0; asf->packet_time_start = 0; for(i=0; i<s->nb_streams; i++){ asf_st= s->streams[i]->priv_data; av_free_packet(&asf_st->pkt); asf_st->frag_offset=0; asf_st->seq=0; } asf->asf_st= NULL; } static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit) { ASFContext *asf = s->priv_data; AVPacket pkt1, *pkt = &pkt1; ASFStream *asf_st; int64_t pts; int64_t pos= *ppos; int i; int64_t start_pos[s->nb_streams]; for(i=0; i<s->nb_streams; i++){ start_pos[i]= pos; } pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset; *ppos= pos; url_fseek(&s->pb, pos, SEEK_SET); //printf("asf_read_pts\n"); asf_reset_header(s); for(;;){ if (av_read_frame(s, pkt) < 0){ av_log(s, AV_LOG_INFO, "seek failed\n"); return AV_NOPTS_VALUE; } pts= pkt->pts * 1000 / AV_TIME_BASE; av_free_packet(pkt); if(pkt->flags&PKT_FLAG_KEY){ i= pkt->stream_index; asf_st= s->streams[i]->priv_data; assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0); pos= asf_st->packet_pos; av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME); start_pos[i]= asf_st->packet_pos + 1; if(pkt->stream_index == stream_index) break; } } *ppos= pos; //printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts); return pts; } static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags) { ASFContext *asf = s->priv_data; if (asf->packet_size <= 0) return -1; if(av_seek_frame_binary(s, stream_index, pts, flags)<0) return -1; asf_reset_header(s); return 0; } static AVInputFormat asf_iformat = { "asf", "asf format", sizeof(ASFContext), asf_probe, asf_read_header, asf_read_packet, asf_read_close, asf_read_seek, asf_read_pts, }; #ifdef CONFIG_ENCODERS extern AVOutputFormat asf_oformat; extern AVOutputFormat asf_stream_oformat; #endif //CONFIG_ENCODERS int asf_init(void) { av_register_input_format(&asf_iformat); #ifdef CONFIG_ENCODERS av_register_output_format(&asf_oformat); av_register_output_format(&asf_stream_oformat); #endif //CONFIG_ENCODERS return 0; }