/* * 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 "tick.h" #include "mpegaudio.h" #define PACKET_SIZE 3200 #define PACKET_HEADER_SIZE 12 #define FRAME_HEADER_SIZE 17 typedef struct { int num; int seq; Ticker pts_ticker; /* use for reading */ AVPacket pkt; int frag_offset; INT64 duration; } ASFStream; typedef struct { int seqno; int packet_size; ASFStream streams[2]; /* non streamed additonnal info */ int data_offset; INT64 nb_packets; INT64 duration; /* in 100ns units */ /* packet filling */ int packet_size_left; int packet_timestamp_start; int packet_timestamp_end; int packet_nb_frames; UINT8 packet_buf[PACKET_SIZE]; ByteIOContext pb; /* only for reading */ int packet_padsize; } ASFContext; typedef struct { UINT32 v1; UINT16 v2; UINT16 v3; UINT8 v4[8]; } GUID; 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 }, }; /* 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 }, }; CodecTag codec_asf_bmp_tags[] = { { CODEC_ID_H263, MKTAG('H', '2', '6', '3') }, { CODEC_ID_H263P, MKTAG('H', '2', '6', '3') }, { CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */ { CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') }, { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') }, { CODEC_ID_MPEG4, MKTAG('d', 'i', 'v', 'x') }, { CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */ { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') }, /* default signature when using MSMPEG4 */ { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3') }, { CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') }, { CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', '4', '1') }, { 0, 0 }, }; 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)*tag++; put_le16(s, c); if (c == '\0') break; } } static void put_str16_nolen(ByteIOContext *s, const char *tag) { int c; for(;;) { c = (UINT8)*tag++; put_le16(s, c); if (c == '\0') break; } } static INT64 put_header(ByteIOContext *pb, const GUID *g) { INT64 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 pos) { INT64 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 unix_to_file_time(int ti) { INT64 t; t = ti * INT64_C(10000000); t += INT64_C(116444736000000000); return t; } /* write the header (used two times if non streamed) */ static int asf_write_header1(AVFormatContext *s, INT64 file_size, INT64 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 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 (url_is_streamed(&s->pb)) { put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */ } put_guid(pb, &asf_header); put_le64(pb, 0); /* 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, url_is_streamed(&s->pb) ? 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 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; /* Init the ticker */ ticker_init(&stream->pts_ticker, enc->sample_rate, 1000 * enc->frame_size); break; default: case CODEC_TYPE_VIDEO: wav_extra_size = 0; extra_size = 0x33; extra_size2 = 0; /* Init the ticker */ ticker_init(&stream->pts_ticker, enc->frame_rate, 1000 * FRAME_RATE_BASE); 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_asf_bmp_tags); } 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); put_le16(pb, codec_get_tag(codec_wav_tags, enc->codec_id)); } else { put_le16(pb, 4); put_le32(pb, codec_get_tag(codec_asf_bmp_tags, enc->codec_id)); } } end_header(pb, hpos); /* patch the header size fields */ cur_pos = url_ftell(pb); header_size = cur_pos - header_offset; if (url_is_streamed(&s->pb)) { 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; 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; } /* 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 (url_is_streamed(&s->pb)) { 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.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, UINT8 *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, 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, UINT8 *buf, int size, int force_pts) { ASFContext *asf = s->priv_data; ASFStream *stream; int timestamp; INT64 duration; AVCodecContext *codec; stream = &asf->streams[stream_index]; codec = &s->streams[stream_index]->codec; stream = &asf->streams[stream_index]; if (codec->codec_type == CODEC_TYPE_AUDIO) { timestamp = (int)ticker_abs(&stream->pts_ticker, codec->frame_number); duration = (codec->frame_number * codec->frame_size * INT64_C(10000000)) / codec->sample_rate; } else { timestamp = (int)ticker_abs(&stream->pts_ticker, codec->frame_number); duration = codec->frame_number * ((INT64_C(10000000) * FRAME_RATE_BASE) / 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 file_size; /* flush the current packet */ if (asf->pb.buf_ptr > asf->pb.buffer) flush_packet(s); if (url_is_streamed(&s->pb)) { 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; } /**********************************/ /* decoding */ //#define DEBUG #ifdef DEBUG static void print_guid(const GUID *g) { int i; 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"); } #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, bps; INT64 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); 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, &g); get_le64(pb); /* file size */ get_le64(pb); /* file time */ get_le64(pb); /* nb_packets */ get_le64(pb); /* length 0 in us */ get_le64(pb); /* length 1 in us */ get_le32(pb); get_le32(pb); get_le32(pb); asf->packet_size = get_le32(pb); get_le32(pb); get_le32(pb); } else if (!memcmp(&g, &stream_header, sizeof(GUID))) { int type, id, total_size; unsigned int tag1; INT64 pos1, pos2; pos1 = url_ftell(pb); st = av_mallocz(sizeof(AVStream)); if (!st) goto fail; s->streams[s->nb_streams++] = st; asf_st = av_mallocz(sizeof(ASFStream)); if (!asf_st) goto fail; st->priv_data = asf_st; 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); get_le32(pb); get_le32(pb); st->id = get_le16(pb); /* stream id */ get_le32(pb); st->codec.codec_type = type; if (type == CODEC_TYPE_AUDIO) { id = get_le16(pb); st->codec.codec_tag = id; st->codec.channels = get_le16(pb); st->codec.sample_rate = get_le32(pb); st->codec.bit_rate = get_le32(pb) * 8; get_le16(pb); /* block align */ bps = get_le16(pb); /* bits per sample */ st->codec.codec_id = wav_codec_get_id(id, bps); size = get_le16(pb); url_fskip(pb, size); /* We have to init the frame size at some point .... */ switch (st->codec.codec_id) { case CODEC_ID_MP3LAME: 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 */ get_le32(pb); /* size */ st->codec.width = get_le32(pb); st->codec.height = get_le32(pb); st->codec.frame_rate = 25 * FRAME_RATE_BASE; /* XXX: find it */ get_le16(pb); /* panes */ get_le16(pb); /* depth */ tag1 = get_le32(pb); st->codec.codec_tag = tag1; st->codec.codec_id = codec_get_id(codec_asf_bmp_tags, tag1); url_fskip(pb, size - 5 * 4); } 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); #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); 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); } //av_free(asf); return -1; } static int asf_get_packet(AVFormatContext *s) { ASFContext *asf = s->priv_data; ByteIOContext *pb = &s->pb; int c, flags, timestamp, hdr_size; hdr_size = 12; c = get_byte(pb); if (c != 0x82) return -EIO; get_le16(pb); flags = get_byte(pb); get_byte(pb); asf->packet_padsize = 0; if (flags & 0x10) { asf->packet_padsize = get_le16(pb); hdr_size += 2; } else if (flags & 0x08) { asf->packet_padsize = get_byte(pb); hdr_size++; } timestamp = get_le32(pb); get_le16(pb); /* duration */ get_byte(pb); /* nb_frames */ #ifdef DEBUG printf("packet: size=%d padsize=%d\n", asf->packet_size, asf->packet_padsize); #endif asf->packet_size_left = asf->packet_size - hdr_size; return 0; } static int asf_read_packet(AVFormatContext *s, AVPacket *pkt) { ASFContext *asf = s->priv_data; AVStream *st; ASFStream *asf_st; ByteIOContext *pb = &s->pb; int ret, num, seq, frag_offset, payload_size, frag_len; int key_frame; int timestamp, i; for(;;) { if (asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_size_left <= asf->packet_padsize) { /* fail safe */ if (asf->packet_size_left) url_fskip(pb, asf->packet_size_left); ret = asf_get_packet(s); if (ret < 0) return -EIO; } /* read frame header */ num = get_byte(pb); if (num & 0x80) key_frame = 1; else key_frame = 0; num &= 0x7f; seq = get_byte(pb); frag_offset = get_le32(pb); get_byte(pb); /* flags */ payload_size = get_le32(pb); timestamp = get_le32(pb); frag_len = get_le16(pb); #ifdef DEBUG printf("num=%d seq=%d totsize=%d frag_off=%d frag_size=%d\n", num, seq, payload_size, frag_offset, frag_len); #endif st = NULL; for(i=0;inb_streams;i++) { st = s->streams[i]; if (st->id == num) break; } asf->packet_size_left -= FRAME_HEADER_SIZE + frag_len; if (i == s->nb_streams) { /* unhandled packet (should not happen) */ url_fskip(pb, frag_len); } else { asf_st = st->priv_data; if (asf_st->frag_offset == 0) { /* new packet */ av_new_packet(&asf_st->pkt, payload_size); asf_st->seq = seq; if (key_frame) asf_st->pkt.flags |= PKT_FLAG_KEY; asf_st->pkt.pts = timestamp; } else { if (seq == asf_st->seq && frag_offset == asf_st->frag_offset) { /* continuing packet */ } else { /* cannot continue current packet: free it */ av_free_packet(&asf_st->pkt); asf_st->frag_offset = 0; if (frag_offset != 0) { /* cannot create new packet */ url_fskip(pb, frag_len); goto next_frame; } else { /* create new packet */ av_new_packet(&asf_st->pkt, payload_size); asf_st->seq = seq; } } } /* read data */ get_buffer(pb, asf_st->pkt.data + frag_offset, frag_len); asf_st->frag_offset += frag_len; /* test if whole packet read */ if (asf_st->frag_offset == asf_st->pkt.size) { /* return packet */ asf_st->pkt.stream_index = i; asf_st->frag_offset = 0; memcpy(pkt, &asf_st->pkt, sizeof(AVPacket)); break; } } next_frame:; } return 0; } static int asf_read_close(AVFormatContext *s) { //ASFContext *asf = s->priv_data; int i; for(i=0;inb_streams;i++) { AVStream *st = s->streams[i]; av_free(st->priv_data); } //av_free(asf); return 0; } AVInputFormat asf_iformat = { "asf", "asf format", sizeof(ASFContext), asf_probe, asf_read_header, asf_read_packet, asf_read_close, }; AVOutputFormat asf_oformat = { "asf", "asf format", "application/octet-stream", "asf,wmv", sizeof(ASFContext), #ifdef CONFIG_MP3LAME CODEC_ID_MP3LAME, #else CODEC_ID_MP2, #endif CODEC_ID_MSMPEG4, asf_write_header, asf_write_packet, asf_write_trailer, }; int asf_init(void) { av_register_input_format(&asf_iformat); av_register_output_format(&asf_oformat); return 0; }