/* * ASF compatible encoder and 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 #undef NDEBUG #include #define MPA_FRAME_SIZE 1152 #define PACKET_SIZE 3200 #define PACKET_HEADER_SIZE 12 #define FRAME_HEADER_SIZE 17 typedef struct { int num; int seq; /* use for reading */ AVPacket pkt; int frag_offset; int timestamp; int64_t duration; int ds_span; /* descrambling */ int ds_packet_size; int ds_chunk_size; int ds_data_size; int ds_silence_data; int packet_pos; } ASFStream; typedef struct { uint32_t v1; uint16_t v2; uint16_t v3; uint8_t v4[8]; } GUID; typedef struct { GUID guid; // generated by client computer uint64_t file_size; // in bytes // invalid if broadcasting uint64_t create_time; // time of creation, in 100-nanosecond units since 1.1.1601 // invalid if broadcasting uint64_t packets_count; // how many packets are there in the file // invalid if broadcasting uint64_t play_time; // play time, in 100-nanosecond units // invalid if broadcasting uint64_t send_time; // time to send file, in 100-nanosecond units // invalid if broadcasting (could be ignored) uint32_t preroll; // timestamp of the first packet, in milliseconds // if nonzero - substract from time uint32_t ignore; // preroll is 64bit - but let's just ignore it uint32_t flags; // 0x01 - broadcast // 0x02 - seekable // rest is reserved should be 0 uint32_t min_pktsize; // size of a data packet // invalid if broadcasting uint32_t max_pktsize; // shall be the same as for min_pktsize // invalid if broadcasting uint32_t max_bitrate; // bandwith of stream in bps // should be the sum of bitrates of the // individual media streams } ASFMainHeader; typedef struct { int seqno; int packet_size; int is_streamed; int asfid2avid[128]; /* conversion table from asf ID 2 AVStream ID */ ASFStream streams[128]; /* it's max number and it's not that big */ /* non streamed additonnal info */ int64_t nb_packets; int64_t duration; /* in 100ns units */ /* packet filling */ int packet_size_left; int packet_timestamp_start; int packet_timestamp_end; int packet_nb_frames; uint8_t packet_buf[PACKET_SIZE]; ByteIOContext pb; /* only for reading */ uint64_t data_offset; /* begining of the first data packet */ ASFMainHeader hdr; int packet_flags; int packet_property; int packet_timestamp; int packet_segsizetype; int packet_segments; int packet_seq; int packet_replic_size; int packet_key_frame; int packet_padsize; int packet_frag_offset; int packet_frag_size; int packet_frag_timestamp; int packet_multi_size; int packet_obj_size; int packet_time_delta; int packet_time_start; int packet_pos; int stream_index; ASFStream* asf_st; /* currently decoded stream */ } ASFContext; static const GUID asf_header = { 0x75B22630, 0x668E, 0x11CF, { 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, }; static const GUID file_header = { 0x8CABDCA1, 0xA947, 0x11CF, { 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, }; static const GUID stream_header = { 0xB7DC0791, 0xA9B7, 0x11CF, { 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, }; static const GUID audio_stream = { 0xF8699E40, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B }, }; static const GUID audio_conceal_none = { // 0x49f1a440, 0x4ece, 0x11d0, { 0xa3, 0xac, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 }, // New value lifted from avifile 0x20fb5700, 0x5b55, 0x11cf, { 0xa8, 0xfd, 0x00, 0x80, 0x5f, 0x5c, 0x44, 0x2b }, }; static const GUID video_stream = { 0xBC19EFC0, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B }, }; static const GUID video_conceal_none = { 0x20FB5700, 0x5B55, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B }, }; static const GUID comment_header = { 0x75b22633, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c }, }; static const GUID codec_comment_header = { 0x86D15240, 0x311D, 0x11D0, { 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, }; static const GUID codec_comment1_header = { 0x86d15241, 0x311d, 0x11d0, { 0xa3, 0xa4, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 }, }; static const GUID data_header = { 0x75b22636, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c }, }; static const GUID index_guid = { 0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb }, }; static const GUID head1_guid = { 0x5fbf03b5, 0xa92e, 0x11cf, { 0x8e, 0xe3, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 }, }; static const GUID head2_guid = { 0xabd3d211, 0xa9ba, 0x11cf, { 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 }, }; static const GUID extended_content_header = { 0xD2D0A440, 0xE307, 0x11D2, { 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5E, 0xA8, 0x50 }, }; /* I am not a number !!! This GUID is the one found on the PC used to generate the stream */ static const GUID my_guid = { 0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 }, }; const CodecTag codec_wav_tags[] = { { CODEC_ID_MP2, 0x50 }, { CODEC_ID_MP3, 0x55 }, { CODEC_ID_AC3, 0x2000 }, { CODEC_ID_PCM_S16LE, 0x01 }, { CODEC_ID_PCM_U8, 0x01 }, /* must come after s16le in this list */ { CODEC_ID_PCM_ALAW, 0x06 }, { CODEC_ID_PCM_MULAW, 0x07 }, { CODEC_ID_ADPCM_MS, 0x02 }, { CODEC_ID_ADPCM_IMA_WAV, 0x11 }, { CODEC_ID_ADPCM_IMA_DK4, 0x61 }, /* rogue format number */ { CODEC_ID_ADPCM_IMA_DK3, 0x62 }, /* rogue format number */ { CODEC_ID_WMAV1, 0x160 }, { CODEC_ID_WMAV2, 0x161 }, { 0, 0 }, }; enum CodecID codec_get_id(const CodecTag *tags, unsigned int tag) { while (tags->id != 0) { if( toupper((tag >> 0)&0xFF) == toupper((tags->tag >> 0)&0xFF) && toupper((tag >> 8)&0xFF) == toupper((tags->tag >> 8)&0xFF) && toupper((tag >>16)&0xFF) == toupper((tags->tag >>16)&0xFF) && toupper((tag >>24)&0xFF) == toupper((tags->tag >>24)&0xFF)) return tags->id; tags++; } return CODEC_ID_NONE; } int wav_codec_get_id(unsigned int tag, int bps) { int id; id = codec_get_id(codec_wav_tags, tag); if (id <= 0) return id; /* handle specific u8 codec */ if (id == CODEC_ID_PCM_S16LE && bps == 8) id = CODEC_ID_PCM_U8; return id; } void get_wav_header(ByteIOContext *pb, AVCodecContext *codec, int size) { int id; id = get_le16(pb); codec->codec_type = CODEC_TYPE_AUDIO; codec->codec_tag = id; codec->channels = get_le16(pb); codec->sample_rate = get_le32(pb); codec->bit_rate = get_le32(pb) * 8; codec->block_align = get_le16(pb); if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */ codec->bits_per_sample = 8; }else codec->bits_per_sample = get_le16(pb); codec->codec_id = wav_codec_get_id(id, codec->bits_per_sample); if (size > 16) { /* We're obviously dealing with WAVEFORMATEX */ codec->extradata_size = get_le16(pb); if (codec->extradata_size > 0) { if (codec->extradata_size > size - 18) codec->extradata_size = size - 18; codec->extradata = av_mallocz(codec->extradata_size); get_buffer(pb, codec->extradata, codec->extradata_size); } else codec->extradata_size = 0; /* It is possible for the chunk to contain garbage at the end */ if (size - codec->extradata_size - 18 > 0) url_fskip(pb, size - codec->extradata_size - 18); } } #ifdef CONFIG_ENCODERS static void put_guid(ByteIOContext *s, const GUID *g) { int i; put_le32(s, g->v1); put_le16(s, g->v2); put_le16(s, g->v3); for(i=0;i<8;i++) put_byte(s, g->v4[i]); } static void put_str16(ByteIOContext *s, const char *tag) { int c; put_le16(s,strlen(tag) + 1); for(;;) { c = (uint8_t)*tag++; put_le16(s, c); if (c == '\0') break; } } static void put_str16_nolen(ByteIOContext *s, const char *tag) { int c; for(;;) { c = (uint8_t)*tag++; put_le16(s, c); if (c == '\0') break; } } static int64_t put_header(ByteIOContext *pb, const GUID *g) { int64_t pos; pos = url_ftell(pb); put_guid(pb, g); put_le64(pb, 24); return pos; } /* update header size */ static void end_header(ByteIOContext *pb, int64_t pos) { int64_t pos1; pos1 = url_ftell(pb); url_fseek(pb, pos + 16, SEEK_SET); put_le64(pb, pos1 - pos); url_fseek(pb, pos1, SEEK_SET); } /* write an asf chunk (only used in streaming case) */ static void put_chunk(AVFormatContext *s, int type, int payload_length, int flags) { ASFContext *asf = s->priv_data; ByteIOContext *pb = &s->pb; int length; length = payload_length + 8; put_le16(pb, type); put_le16(pb, length); put_le32(pb, asf->seqno); put_le16(pb, flags); /* unknown bytes */ put_le16(pb, length); asf->seqno++; } /* convert from unix to windows time */ static int64_t unix_to_file_time(int ti) { int64_t t; t = ti * int64_t_C(10000000); t += int64_t_C(116444736000000000); return t; } /* write the header (used two times if non streamed) */ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data_chunk_size) { ASFContext *asf = s->priv_data; ByteIOContext *pb = &s->pb; int header_size, n, extra_size, extra_size2, wav_extra_size, file_time; int has_title; AVCodecContext *enc; int64_t header_offset, cur_pos, hpos; int bit_rate; has_title = (s->title[0] || s->author[0] || s->copyright[0] || s->comment[0]); bit_rate = 0; for(n=0;nnb_streams;n++) { enc = &s->streams[n]->codec; bit_rate += enc->bit_rate; } if (asf->is_streamed) { put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */ } put_guid(pb, &asf_header); put_le64(pb, -1); /* header length, will be patched after */ put_le32(pb, 3 + has_title + s->nb_streams); /* number of chunks in header */ put_byte(pb, 1); /* ??? */ put_byte(pb, 2); /* ??? */ /* file header */ header_offset = url_ftell(pb); hpos = put_header(pb, &file_header); put_guid(pb, &my_guid); put_le64(pb, file_size); file_time = 0; put_le64(pb, unix_to_file_time(file_time)); put_le64(pb, asf->nb_packets); /* number of packets */ put_le64(pb, asf->duration); /* end time stamp (in 100ns units) */ put_le64(pb, asf->duration); /* duration (in 100ns units) */ put_le32(pb, 0); /* start time stamp */ put_le32(pb, 0); /* ??? */ put_le32(pb, asf->is_streamed ? 1 : 0); /* ??? */ put_le32(pb, asf->packet_size); /* packet size */ put_le32(pb, asf->packet_size); /* packet size */ put_le32(pb, bit_rate); /* Nominal data rate in bps */ end_header(pb, hpos); /* unknown headers */ hpos = put_header(pb, &head1_guid); put_guid(pb, &head2_guid); put_le32(pb, 6); put_le16(pb, 0); end_header(pb, hpos); /* title and other infos */ if (has_title) { hpos = put_header(pb, &comment_header); put_le16(pb, 2 * (strlen(s->title) + 1)); put_le16(pb, 2 * (strlen(s->author) + 1)); put_le16(pb, 2 * (strlen(s->copyright) + 1)); put_le16(pb, 2 * (strlen(s->comment) + 1)); put_le16(pb, 0); put_str16_nolen(pb, s->title); put_str16_nolen(pb, s->author); put_str16_nolen(pb, s->copyright); put_str16_nolen(pb, s->comment); end_header(pb, hpos); } /* stream headers */ for(n=0;nnb_streams;n++) { int64_t es_pos; // ASFStream *stream = &asf->streams[n]; enc = &s->streams[n]->codec; asf->streams[n].num = n + 1; asf->streams[n].seq = 0; switch(enc->codec_type) { case CODEC_TYPE_AUDIO: wav_extra_size = 0; extra_size = 18 + wav_extra_size; extra_size2 = 0; break; default: case CODEC_TYPE_VIDEO: wav_extra_size = 0; extra_size = 0x33; extra_size2 = 0; break; } hpos = put_header(pb, &stream_header); if (enc->codec_type == CODEC_TYPE_AUDIO) { put_guid(pb, &audio_stream); put_guid(pb, &audio_conceal_none); } else { put_guid(pb, &video_stream); put_guid(pb, &video_conceal_none); } put_le64(pb, 0); /* ??? */ es_pos = url_ftell(pb); put_le32(pb, extra_size); /* wav header len */ put_le32(pb, extra_size2); /* additional data len */ put_le16(pb, n + 1); /* stream number */ put_le32(pb, 0); /* ??? */ if (enc->codec_type == CODEC_TYPE_AUDIO) { /* WAVEFORMATEX header */ int wavsize = put_wav_header(pb, enc); if (wavsize < 0) return -1; if (wavsize != extra_size) { cur_pos = url_ftell(pb); url_fseek(pb, es_pos, SEEK_SET); put_le32(pb, wavsize); /* wav header len */ url_fseek(pb, cur_pos, SEEK_SET); } } else { put_le32(pb, enc->width); put_le32(pb, enc->height); put_byte(pb, 2); /* ??? */ put_le16(pb, 40); /* size */ /* BITMAPINFOHEADER header */ put_bmp_header(pb, enc, codec_bmp_tags, 1); } end_header(pb, hpos); } /* media comments */ hpos = put_header(pb, &codec_comment_header); put_guid(pb, &codec_comment1_header); put_le32(pb, s->nb_streams); for(n=0;nnb_streams;n++) { AVCodec *p; enc = &s->streams[n]->codec; p = avcodec_find_encoder(enc->codec_id); put_le16(pb, asf->streams[n].num); put_str16(pb, p ? p->name : enc->codec_name); put_le16(pb, 0); /* no parameters */ /* id */ if (enc->codec_type == CODEC_TYPE_AUDIO) { put_le16(pb, 2); if(!enc->codec_tag) enc->codec_tag = codec_get_tag(codec_wav_tags, enc->codec_id); if(!enc->codec_tag) return -1; put_le16(pb, enc->codec_tag); } else { put_le16(pb, 4); if(!enc->codec_tag) enc->codec_tag = codec_get_tag(codec_bmp_tags, enc->codec_id); if(!enc->codec_tag) return -1; put_le32(pb, enc->codec_tag); } } end_header(pb, hpos); /* patch the header size fields */ cur_pos = url_ftell(pb); header_size = cur_pos - header_offset; if (asf->is_streamed) { header_size += 8 + 30 + 50; url_fseek(pb, header_offset - 10 - 30, SEEK_SET); put_le16(pb, header_size); url_fseek(pb, header_offset - 2 - 30, SEEK_SET); put_le16(pb, header_size); header_size -= 8 + 30 + 50; } header_size += 24 + 6; url_fseek(pb, header_offset - 14, SEEK_SET); put_le64(pb, header_size); url_fseek(pb, cur_pos, SEEK_SET); /* movie chunk, followed by packets of packet_size */ asf->data_offset = cur_pos; put_guid(pb, &data_header); put_le64(pb, data_chunk_size); put_guid(pb, &my_guid); put_le64(pb, asf->nb_packets); /* nb packets */ put_byte(pb, 1); /* ??? */ put_byte(pb, 1); /* ??? */ return 0; } static int asf_write_header(AVFormatContext *s) { ASFContext *asf = s->priv_data; av_set_pts_info(s, 32, 1, 1000); /* 32 bit pts in ms */ asf->packet_size = PACKET_SIZE; asf->nb_packets = 0; if (asf_write_header1(s, 0, 50) < 0) { //av_free(asf); return -1; } put_flush_packet(&s->pb); asf->packet_nb_frames = 0; asf->packet_timestamp_start = -1; asf->packet_timestamp_end = -1; asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE; init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1, NULL, NULL, NULL, NULL); return 0; } static int asf_write_stream_header(AVFormatContext *s) { ASFContext *asf = s->priv_data; asf->is_streamed = 1; return asf_write_header(s); } /* write a fixed size packet */ static int put_packet(AVFormatContext *s, unsigned int timestamp, unsigned int duration, int nb_frames, int padsize) { ASFContext *asf = s->priv_data; ByteIOContext *pb = &s->pb; int flags; if (asf->is_streamed) { put_chunk(s, 0x4424, asf->packet_size, 0); } put_byte(pb, 0x82); put_le16(pb, 0); flags = 0x01; /* nb segments present */ if (padsize > 0) { if (padsize < 256) flags |= 0x08; else flags |= 0x10; } put_byte(pb, flags); /* flags */ put_byte(pb, 0x5d); if (flags & 0x10) put_le16(pb, padsize - 2); if (flags & 0x08) put_byte(pb, padsize - 1); put_le32(pb, timestamp); put_le16(pb, duration); put_byte(pb, nb_frames | 0x80); return PACKET_HEADER_SIZE + ((flags & 0x18) >> 3); } static void flush_packet(AVFormatContext *s) { ASFContext *asf = s->priv_data; int hdr_size, ptr; hdr_size = put_packet(s, asf->packet_timestamp_start, asf->packet_timestamp_end - asf->packet_timestamp_start, asf->packet_nb_frames, asf->packet_size_left); /* Clear out the padding bytes */ ptr = asf->packet_size - hdr_size - asf->packet_size_left; memset(asf->packet_buf + ptr, 0, asf->packet_size_left); put_buffer(&s->pb, asf->packet_buf, asf->packet_size - hdr_size); put_flush_packet(&s->pb); asf->nb_packets++; asf->packet_nb_frames = 0; asf->packet_timestamp_start = -1; asf->packet_timestamp_end = -1; asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE; init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1, NULL, NULL, NULL, NULL); } static void put_frame_header(AVFormatContext *s, ASFStream *stream, int timestamp, int payload_size, int frag_offset, int frag_len) { ASFContext *asf = s->priv_data; ByteIOContext *pb = &asf->pb; int val; val = stream->num; if (s->streams[val - 1]->codec.coded_frame->key_frame /* && frag_offset == 0 */) val |= 0x80; put_byte(pb, val); put_byte(pb, stream->seq); put_le32(pb, frag_offset); /* fragment offset */ put_byte(pb, 0x08); /* flags */ put_le32(pb, payload_size); put_le32(pb, timestamp); put_le16(pb, frag_len); } /* Output a frame. We suppose that payload_size <= PACKET_SIZE. It is there that you understand that the ASF format is really crap. They have misread the MPEG Systems spec ! */ static void put_frame(AVFormatContext *s, ASFStream *stream, int timestamp, const uint8_t *buf, int payload_size) { ASFContext *asf = s->priv_data; int frag_pos, frag_len, frag_len1; frag_pos = 0; while (frag_pos < payload_size) { frag_len = payload_size - frag_pos; frag_len1 = asf->packet_size_left - FRAME_HEADER_SIZE; if (frag_len1 > 0) { if (frag_len > frag_len1) frag_len = frag_len1; put_frame_header(s, stream, timestamp+1, payload_size, frag_pos, frag_len); put_buffer(&asf->pb, buf, frag_len); asf->packet_size_left -= (frag_len + FRAME_HEADER_SIZE); asf->packet_timestamp_end = timestamp; if (asf->packet_timestamp_start == -1) asf->packet_timestamp_start = timestamp; asf->packet_nb_frames++; } else { frag_len = 0; } frag_pos += frag_len; buf += frag_len; /* output the frame if filled */ if (asf->packet_size_left <= FRAME_HEADER_SIZE) flush_packet(s); } stream->seq++; } static int asf_write_packet(AVFormatContext *s, int stream_index, const uint8_t *buf, int size, int64_t timestamp) { ASFContext *asf = s->priv_data; ASFStream *stream; int64_t duration; AVCodecContext *codec; codec = &s->streams[stream_index]->codec; stream = &asf->streams[stream_index]; if (codec->codec_type == CODEC_TYPE_AUDIO) { duration = (codec->frame_number * codec->frame_size * int64_t_C(10000000)) / codec->sample_rate; } else { duration = av_rescale(codec->frame_number * codec->frame_rate_base, 10000000, codec->frame_rate); } if (duration > asf->duration) asf->duration = duration; put_frame(s, stream, timestamp, buf, size); return 0; } static int asf_write_trailer(AVFormatContext *s) { ASFContext *asf = s->priv_data; int64_t file_size; /* flush the current packet */ if (asf->pb.buf_ptr > asf->pb.buffer) flush_packet(s); if (asf->is_streamed) { put_chunk(s, 0x4524, 0, 0); /* end of stream */ } else { /* rewrite an updated header */ file_size = url_ftell(&s->pb); url_fseek(&s->pb, 0, SEEK_SET); asf_write_header1(s, file_size, file_size - asf->data_offset); } put_flush_packet(&s->pb); return 0; } #endif //CONFIG_ENCODERS /**********************************/ /* 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 char *getlocale() { char *str; str = strstr(getenv("LANG"), "."); if(str) *str++; else str = "US-ASCII"; return str; } static void tag_recode(char *before, unsigned int len) { return; int result; iconv_t frt; char ansb[len]; char ansa[len]; char *ansbptr = ansb; char *ansaptr = ansa; unsigned int len1 = 2 * len; unsigned int length = len; memcpy(ansb, before, len); frt = iconv_open(getlocale(), "UNICODE"); if (frt == (iconv_t) - 1) { return; } result = iconv(frt, &ansbptr, &len, &ansaptr, &len1); if (result == (size_t) - 1) { return; } else memcpy(before, ansa, length); if (iconv_close(frt) != 0) if (iconv_close(frt) != 0) return; return; } static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size) { int c, lenz; char *q; q = buf; lenz = len; while (len > 0) { c = get_byte(pb); if ((q - buf) < buf_size-1) *q++ = c; len--; } tag_recode(buf, lenz); } 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; int i; int64_t gsize; av_set_pts_info(s, 32, 1, 1000); /* 32 bit pts in ms */ 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; //unsigned int tag1; int64_t pos1, pos2; pos1 = url_ftell(pb); st = av_new_stream(s, 0); if (!st) goto fail; asf_st = av_mallocz(sizeof(ASFStream)); if (!asf_st) goto fail; st->priv_data = asf_st; st->start_time = asf->hdr.preroll / (10000000 / AV_TIME_BASE); st->duration = (asf->hdr.send_time - asf->hdr.preroll) / (10000000 / AV_TIME_BASE); 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; /* 1 fps default (XXX: put 0 fps instead) */ st->codec.frame_rate = 1; st->codec.frame_rate_base = 1; 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; } } #if 0 } else { get_le32(pb); get_le32(pb); get_byte(pb); size = get_le16(pb); /* size */ 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); if (size > 40) { st->codec.extradata_size = size - 40; st->codec.extradata = av_mallocz(st->codec.extradata_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); } #endif 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;ialbum, value); } if (strcmp(name,"WM/Genre")==0) { strcpy(s->genre, value); } if (strcmp(name,"WM/Year")==0) s->year = atoi(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 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;inb_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; assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0); c = get_byte(pb); if (c != 0x82) { if (!url_feof(pb)) printf("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)) printf("ff asf bad non zero\n"); return -EIO; } rsize+=2; /* }else{ if (!url_feof(pb)) printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb)); return -EIO;*/ } 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 -EIO; 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) { 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; printf("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 printf("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); printf("ff asf parser skiping %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->hdr.preroll; 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 */ unsigned 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;inb_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; inb_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, int64_t *ppos, int stream_index) { 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; inb_streams; i++){ start_pos[i]= pos; } //printf("asf_read_pts\n"); url_fseek(&s->pb, pos*asf->packet_size + s->data_offset, SEEK_SET); asf_reset_header(s); for(;;){ if (av_read_frame(s, pkt) < 0){ printf("seek failed\n"); return AV_NOPTS_VALUE; } pts= pkt->pts; 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 - s->data_offset) / asf->packet_size; av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME); start_pos[i]= 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) { ASFContext *asf = s->priv_data; AVStream *st; int64_t pos; int64_t pos_min, pos_max, pts_min, pts_max, cur_pts, pos_limit; int no_change; if (stream_index == -1) stream_index= av_find_default_stream_index(s); if (asf->packet_size <= 0) return -1; pts_max= pts_min= AV_NOPTS_VALUE; pos_max= pos_limit= -1; // gcc thinks its uninitalized st= s->streams[stream_index]; if(st->index_entries){ AVIndexEntry *e; int index; index= av_index_search_timestamp(st, pts); e= &st->index_entries[index]; if(e->timestamp <= pts){ pos_min= e->pos; pts_min= e->timestamp; #ifdef DEBUG_SEEK printf("unsing cached pos_min=0x%llx dts_min=%0.3f\n", pos_min,pts_min / 90000.0); #endif }else{ assert(index==0); } index++; if(index < st->nb_index_entries){ e= &st->index_entries[index]; assert(e->timestamp >= pts); pos_max= e->pos; pts_max= e->timestamp; pos_limit= pos_max - e->min_distance; #ifdef DEBUG_SEEK printf("unsing cached pos_max=0x%llx dts_max=%0.3f\n", pos_max,pts_max / 90000.0); #endif } } if(pts_min == AV_NOPTS_VALUE){ pos_min = 0; pts_min = asf_read_pts(s, &pos_min, stream_index); if (pts_min == AV_NOPTS_VALUE) return -1; } if(pts_max == AV_NOPTS_VALUE){ pos_max = (url_filesize(url_fileno(&s->pb)) - 1 - s->data_offset) / asf->packet_size; //FIXME wrong pts_max = s->duration; //FIXME wrong pos_limit= pos_max; } no_change=0; while (pos_min < pos_limit) { int64_t start_pos; assert(pos_limit <= pos_max); if(no_change==0){ int64_t approximate_keyframe_distance= pos_max - pos_limit; // interpolate position (better than dichotomy) pos = (int64_t)((double)(pos_max - pos_min) * (double)(pts - pts_min) / (double)(pts_max - pts_min)) + pos_min - approximate_keyframe_distance; }else if(no_change==1){ // bisection, if interpolation failed to change min or max pos last time pos = (pos_min + pos_limit)>>1; }else{ // linear search if bisection failed, can only happen if there are very few or no keyframes between min/max pos=pos_min; } if(pos <= pos_min) pos= pos_min + 1; else if(pos > pos_limit) pos= pos_limit; start_pos= pos; // read the next timestamp cur_pts = asf_read_pts(s, &pos, stream_index); if(pos == pos_max) no_change++; else no_change=0; #ifdef DEBUG_SEEK printf("%Ld %Ld %Ld / %Ld %Ld %Ld target:%Ld limit:%Ld start:%Ld\n", pos_min, pos, pos_max, pts_min, cur_pts, pts_max, pts, pos_limit, start_pos); #endif assert (cur_pts != AV_NOPTS_VALUE); if (pts < cur_pts) { pos_limit = start_pos - 1; pos_max = pos; pts_max = cur_pts; } else { pos_min = pos; pts_min = cur_pts; /* check if we are lucky */ if (pts == cur_pts) break; } } pos = pos_min; url_fseek(&s->pb, pos*asf->packet_size + s->data_offset, SEEK_SET); 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, }; #ifdef CONFIG_ENCODERS static AVOutputFormat asf_oformat = { "asf", "asf format", "video/x-ms-asf", "asf,wmv", sizeof(ASFContext), #ifdef CONFIG_MP3LAME CODEC_ID_MP3, #else CODEC_ID_MP2, #endif CODEC_ID_MSMPEG4V3, asf_write_header, asf_write_packet, asf_write_trailer, }; static AVOutputFormat asf_stream_oformat = { "asf_stream", "asf format", "video/x-ms-asf", "asf,wmv", sizeof(ASFContext), #ifdef CONFIG_MP3LAME CODEC_ID_MP3, #else CODEC_ID_MP2, #endif CODEC_ID_MSMPEG4V3, asf_write_stream_header, asf_write_packet, asf_write_trailer, }; #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; }