FFmpeg/libavformat/asf.h

/*
 * 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
 */
#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 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 },
};