957 lines
27 KiB
C
957 lines
27 KiB
C
/*
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* ASF compatible encoder and decoder.
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* Copyright (c) 2000, 2001 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "avformat.h"
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#include "avi.h"
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#define PACKET_SIZE 3200
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#define PACKET_HEADER_SIZE 12
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#define FRAME_HEADER_SIZE 17
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typedef struct {
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int num;
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int seq;
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/* use for reading */
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AVPacket pkt;
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int frag_offset;
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} ASFStream;
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typedef struct {
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int seqno;
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int packet_size;
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ASFStream streams[2];
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/* non streamed additonnal info */
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int data_offset;
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INT64 nb_packets;
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INT64 duration; /* in 100ns units */
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/* packet filling */
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int packet_size_left;
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int packet_timestamp_start;
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int packet_timestamp_end;
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int packet_nb_frames;
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UINT8 packet_buf[PACKET_SIZE];
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ByteIOContext pb;
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/* only for reading */
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int packet_padsize;
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} ASFContext;
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typedef struct {
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UINT32 v1;
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UINT16 v2;
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UINT16 v3;
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UINT8 v4[8];
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} GUID;
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static const GUID asf_header = {
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0x75B22630, 0x668E, 0x11CF, { 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C },
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};
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static const GUID file_header = {
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0x8CABDCA1, 0xA947, 0x11CF, { 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },
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};
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static const GUID stream_header = {
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0xB7DC0791, 0xA9B7, 0x11CF, { 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },
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};
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static const GUID audio_stream = {
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0xF8699E40, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
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};
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static const GUID audio_conceal_none = {
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0x49f1a440, 0x4ece, 0x11d0, { 0xa3, 0xac, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },
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};
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static const GUID video_stream = {
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0xBC19EFC0, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
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};
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static const GUID video_conceal_none = {
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0x20FB5700, 0x5B55, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
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};
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static const GUID comment_header = {
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0x75b22633, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },
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};
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static const GUID codec_comment_header = {
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0x86D15240, 0x311D, 0x11D0, { 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 },
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};
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static const GUID codec_comment1_header = {
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0x86d15241, 0x311d, 0x11d0, { 0xa3, 0xa4, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },
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};
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static const GUID data_header = {
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0x75b22636, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },
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};
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static const GUID index_guid = {
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0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
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};
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static const GUID head1_guid = {
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0x5fbf03b5, 0xa92e, 0x11cf, { 0x8e, 0xe3, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },
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};
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static const GUID head2_guid = {
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0xabd3d211, 0xa9ba, 0x11cf, { 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },
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};
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/* I am not a number !!! This GUID is the one found on the PC used to
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generate the stream */
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static const GUID my_guid = {
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0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 },
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};
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static void put_guid(ByteIOContext *s, const GUID *g)
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{
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int i;
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put_le32(s, g->v1);
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put_le16(s, g->v2);
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put_le16(s, g->v3);
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for(i=0;i<8;i++)
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put_byte(s, g->v4[i]);
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}
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static void put_str16(ByteIOContext *s, const char *tag)
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{
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int c;
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put_le16(s,strlen(tag) + 1);
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for(;;) {
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c = (UINT8)*tag++;
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put_le16(s, c);
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if (c == '\0')
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break;
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}
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}
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static void put_str16_nolen(ByteIOContext *s, const char *tag)
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{
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int c;
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for(;;) {
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c = (UINT8)*tag++;
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put_le16(s, c);
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if (c == '\0')
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break;
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}
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}
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static INT64 put_header(ByteIOContext *pb, const GUID *g)
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{
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INT64 pos;
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pos = url_ftell(pb);
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put_guid(pb, g);
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put_le64(pb, 24);
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return pos;
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}
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/* update header size */
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static void end_header(ByteIOContext *pb, INT64 pos)
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{
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INT64 pos1;
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pos1 = url_ftell(pb);
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url_fseek(pb, pos + 16, SEEK_SET);
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put_le64(pb, pos1 - pos);
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url_fseek(pb, pos1, SEEK_SET);
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}
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/* write an asf chunk (only used in streaming case) */
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static void put_chunk(AVFormatContext *s, int type, int payload_length)
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{
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ASFContext *asf = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int length;
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length = payload_length + 8;
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put_le16(pb, type);
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put_le16(pb, length);
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put_le32(pb, asf->seqno);
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put_le16(pb, 0); /* unknown bytes */
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put_le16(pb, length);
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asf->seqno++;
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}
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/* convert from unix to windows time */
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static INT64 unix_to_file_time(int ti)
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{
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INT64 t;
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t = ti * INT64_C(10000000);
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t += INT64_C(116444736000000000);
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return t;
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}
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/* write the header (used two times if non streamed) */
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static int asf_write_header1(AVFormatContext *s, INT64 file_size, INT64 data_chunk_size)
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{
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ASFContext *asf = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;
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int has_title;
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AVCodecContext *enc;
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INT64 header_offset, cur_pos, hpos;
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has_title = (s->title[0] != '\0');
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if (!url_is_streamed(&s->pb)) {
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put_guid(pb, &asf_header);
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put_le64(pb, 0); /* header length, will be patched after */
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put_le32(pb, 3 + has_title + s->nb_streams); /* number of chunks in header */
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put_byte(pb, 1); /* ??? */
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put_byte(pb, 2); /* ??? */
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} else {
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put_chunk(s, 0x4824, 0); /* start of stream (length will be patched later) */
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}
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/* file header */
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header_offset = url_ftell(pb);
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hpos = put_header(pb, &file_header);
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put_guid(pb, &my_guid);
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put_le64(pb, file_size);
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file_time = 0;
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put_le64(pb, unix_to_file_time(file_time));
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put_le64(pb, asf->nb_packets); /* number of packets */
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put_le64(pb, asf->duration); /* end time stamp (in 100ns units) */
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put_le64(pb, asf->duration); /* duration (in 100ns units) */
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put_le32(pb, 0); /* start time stamp */
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put_le32(pb, 0); /* ??? */
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put_le32(pb, 0); /* ??? */
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put_le32(pb, asf->packet_size); /* packet size */
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put_le32(pb, asf->packet_size); /* packet size */
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put_le32(pb, 80 * asf->packet_size); /* frame_size ??? */
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end_header(pb, hpos);
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/* unknown headers */
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hpos = put_header(pb, &head1_guid);
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put_guid(pb, &head2_guid);
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put_le32(pb, 6);
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put_le16(pb, 0);
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end_header(pb, hpos);
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/* title and other infos */
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if (has_title) {
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hpos = put_header(pb, &comment_header);
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put_le16(pb, 2 * (strlen(s->title) + 1));
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put_le16(pb, 2 * (strlen(s->author) + 1));
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put_le16(pb, 2 * (strlen(s->copyright) + 1));
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put_le16(pb, 2 * (strlen(s->comment) + 1));
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put_le16(pb, 0);
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put_str16_nolen(pb, s->title);
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put_str16_nolen(pb, s->author);
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put_str16_nolen(pb, s->copyright);
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put_str16_nolen(pb, s->comment);
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end_header(pb, hpos);
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}
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/* stream headers */
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for(n=0;n<s->nb_streams;n++) {
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enc = &s->streams[n]->codec;
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asf->streams[n].num = n + 1;
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asf->streams[n].seq = 0;
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switch(enc->codec_type) {
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case CODEC_TYPE_AUDIO:
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wav_extra_size = 0;
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extra_size = 18 + wav_extra_size;
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extra_size2 = 0;
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break;
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default:
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case CODEC_TYPE_VIDEO:
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wav_extra_size = 0;
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extra_size = 0x33;
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extra_size2 = 0;
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break;
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}
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hpos = put_header(pb, &stream_header);
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if (enc->codec_type == CODEC_TYPE_AUDIO) {
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put_guid(pb, &audio_stream);
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put_guid(pb, &audio_conceal_none);
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} else {
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put_guid(pb, &video_stream);
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put_guid(pb, &video_conceal_none);
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}
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put_le64(pb, 0); /* ??? */
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put_le32(pb, extra_size); /* wav header len */
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put_le32(pb, extra_size2); /* additional data len */
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put_le16(pb, n + 1); /* stream number */
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put_le32(pb, 0); /* ??? */
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if (enc->codec_type == CODEC_TYPE_AUDIO) {
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/* WAVEFORMATEX header */
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if (put_wav_header(pb, enc) < 0)
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return -1;
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} else {
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put_le32(pb, enc->width);
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put_le32(pb, enc->height);
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put_byte(pb, 2); /* ??? */
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put_le16(pb, 40); /* size */
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/* BITMAPINFOHEADER header */
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put_bmp_header(pb, enc);
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}
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end_header(pb, hpos);
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}
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/* media comments */
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hpos = put_header(pb, &codec_comment_header);
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put_guid(pb, &codec_comment1_header);
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put_le32(pb, s->nb_streams);
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for(n=0;n<s->nb_streams;n++) {
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enc = &s->streams[n]->codec;
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put_le16(pb, asf->streams[n].num);
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put_str16(pb, enc->codec_name);
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put_le16(pb, 0); /* no parameters */
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/* id */
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if (enc->codec_type == CODEC_TYPE_AUDIO) {
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put_le16(pb, 2);
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put_le16(pb, codec_get_tag(codec_wav_tags, enc->codec_id));
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} else {
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put_le16(pb, 4);
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put_le32(pb, codec_get_tag(codec_bmp_tags, enc->codec_id));
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}
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}
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end_header(pb, hpos);
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/* patch the header size fields */
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cur_pos = url_ftell(pb);
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header_size = cur_pos - header_offset;
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if (!url_is_streamed(&s->pb)) {
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header_size += 24 + 6;
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url_fseek(pb, header_offset - 14, SEEK_SET);
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put_le64(pb, header_size);
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} else {
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header_size += 8 + 50;
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url_fseek(pb, header_offset - 10, SEEK_SET);
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put_le16(pb, header_size);
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url_fseek(pb, header_offset - 2, SEEK_SET);
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put_le16(pb, header_size);
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}
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url_fseek(pb, cur_pos, SEEK_SET);
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/* movie chunk, followed by packets of packet_size */
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asf->data_offset = cur_pos;
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put_guid(pb, &data_header);
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put_le64(pb, data_chunk_size);
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put_guid(pb, &my_guid);
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put_le64(pb, asf->nb_packets); /* nb packets */
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put_byte(pb, 1); /* ??? */
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put_byte(pb, 1); /* ??? */
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return 0;
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}
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static int asf_write_header(AVFormatContext *s)
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{
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ASFContext *asf;
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asf = av_mallocz(sizeof(ASFContext));
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if (!asf)
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return -1;
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s->priv_data = asf;
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asf->packet_size = PACKET_SIZE;
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asf->nb_packets = 0;
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if (asf_write_header1(s, 0, 24) < 0) {
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free(asf);
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return -1;
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}
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put_flush_packet(&s->pb);
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asf->packet_nb_frames = 0;
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asf->packet_timestamp_start = -1;
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asf->packet_timestamp_end = -1;
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asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;
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init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,
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NULL, NULL, NULL, NULL);
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return 0;
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}
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/* write a fixed size packet */
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static void put_packet(AVFormatContext *s,
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unsigned int timestamp, unsigned int duration,
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int nb_frames, int padsize)
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{
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ASFContext *asf = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int flags;
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if (url_is_streamed(&s->pb)) {
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put_chunk(s, 0x4424, asf->packet_size);
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}
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put_byte(pb, 0x82);
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put_le16(pb, 0);
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flags = 0x01; /* nb segments present */
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if (padsize > 0) {
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if (padsize < 256)
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flags |= 0x08;
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else
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flags |= 0x10;
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}
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put_byte(pb, flags); /* flags */
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put_byte(pb, 0x5d);
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if (flags & 0x10)
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put_le16(pb, padsize);
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if (flags & 0x08)
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put_byte(pb, padsize);
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put_le32(pb, timestamp);
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put_le16(pb, duration);
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put_byte(pb, nb_frames | 0x80);
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}
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static void flush_packet(AVFormatContext *s)
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{
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ASFContext *asf = s->priv_data;
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int hdr_size, ptr;
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put_packet(s, asf->packet_timestamp_start,
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asf->packet_timestamp_end - asf->packet_timestamp_start,
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asf->packet_nb_frames, asf->packet_size_left);
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/* compute padding */
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hdr_size = PACKET_HEADER_SIZE;
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if (asf->packet_size_left > 0) {
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/* if padding needed, don't forget to count the
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padding byte in the header size */
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hdr_size++;
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asf->packet_size_left--;
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/* XXX: I do not test again exact limit to avoid boundary problems */
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if (asf->packet_size_left > 200) {
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hdr_size++;
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asf->packet_size_left--;
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}
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}
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ptr = asf->packet_size - PACKET_HEADER_SIZE - asf->packet_size_left;
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memset(asf->packet_buf + ptr, 0, asf->packet_size_left);
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put_buffer(&s->pb, asf->packet_buf, asf->packet_size - hdr_size);
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put_flush_packet(&s->pb);
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asf->nb_packets++;
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asf->packet_nb_frames = 0;
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asf->packet_timestamp_start = -1;
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asf->packet_timestamp_end = -1;
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asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;
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init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,
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NULL, NULL, NULL, NULL);
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}
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static void put_frame_header(AVFormatContext *s, ASFStream *stream, int timestamp,
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int payload_size, int frag_offset, int frag_len)
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{
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ASFContext *asf = s->priv_data;
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ByteIOContext *pb = &asf->pb;
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int val;
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val = stream->num;
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if (s->streams[val - 1]->codec.key_frame)
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|
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)
|
|
{
|
|
ASFContext *asf = s->priv_data;
|
|
int timestamp;
|
|
INT64 duration;
|
|
AVCodecContext *codec;
|
|
|
|
codec = &s->streams[stream_index]->codec;
|
|
if (codec->codec_type == CODEC_TYPE_AUDIO) {
|
|
timestamp = (int)((float)codec->frame_number * codec->frame_size * 1000.0 /
|
|
codec->sample_rate);
|
|
duration = (codec->frame_number * codec->frame_size * INT64_C(10000000)) /
|
|
codec->sample_rate;
|
|
} else {
|
|
timestamp = (int)((float)codec->frame_number * 1000.0 * FRAME_RATE_BASE /
|
|
codec->frame_rate);
|
|
duration = codec->frame_number *
|
|
((INT64_C(10000000) * FRAME_RATE_BASE) / codec->frame_rate);
|
|
}
|
|
if (duration > asf->duration)
|
|
asf->duration = duration;
|
|
|
|
put_frame(s, &asf->streams[stream_index], (int)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); /* 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);
|
|
|
|
free(asf);
|
|
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_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
ASFContext *asf;
|
|
GUID g;
|
|
ByteIOContext *pb = &s->pb;
|
|
AVStream *st;
|
|
ASFStream *asf_st;
|
|
int size, i, bps;
|
|
INT64 gsize;
|
|
|
|
asf = av_mallocz(sizeof(ASFContext));
|
|
if (!asf)
|
|
return -1;
|
|
s->priv_data = asf;
|
|
|
|
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);
|
|
} 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_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<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);
|
|
|
|
asf->packet_size_left = 0;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
AVStream *st = s->streams[i];
|
|
if (st)
|
|
free(st->priv_data);
|
|
free(st);
|
|
}
|
|
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 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) & 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;i<s->nb_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;
|
|
} 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;i<s->nb_streams;i++) {
|
|
AVStream *st = s->streams[i];
|
|
free(st->priv_data);
|
|
}
|
|
free(asf);
|
|
return 0;
|
|
}
|
|
|
|
AVFormat asf_format = {
|
|
"asf",
|
|
"asf format",
|
|
"application/octet-stream",
|
|
"asf,wmv",
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MSMPEG4,
|
|
asf_write_header,
|
|
asf_write_packet,
|
|
asf_write_trailer,
|
|
|
|
asf_read_header,
|
|
asf_read_packet,
|
|
asf_read_close,
|
|
};
|