PeerStreamer

/*

 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#define PACKET_SIZE 3200

typedef struct {

    int num;

    unsigned char 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 {

    uint32_t packet_number;

    uint16_t packet_count;

} ASFIndex;

typedef struct {

    uint32_t seqno;

    unsigned 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 */

    unsigned char multi_payloads_present;

    int packet_size_left;

    int prev_packet_sent_time;

    int packet_timestamp_start;

    int packet_timestamp_end;

    unsigned int packet_nb_payloads;

    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;

    int64_t last_indexed_pts;

    ASFIndex* index_ptr;

    uint32_t nb_index_count;

    uint32_t nb_index_memory_alloc;

    uint16_t maximum_packet;

    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 audio_conceal_spread = {

     0xBFC3CD50, 0x618F, 0x11CF, { 0x8B, 0xB2, 0x00, 0xAA, 0x00, 0xB4, 0xE2, 0x20 },

};

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 command_stream = {

    0x59DACFC0, 0x59E6, 0x11D0, { 0xA3, 0xAC, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 },

};

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 },

};

static const GUID simple_index_header = {

        0x33000890, 0xE5B1, 0x11CF, { 0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB },

};

/* 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 },

};

#define ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT 0x80 //1000 0000

//   ASF data packet structure

//   =========================

//

//

//  -----------------------------------

// | Error Correction Data             |  Optional

//  -----------------------------------

// | Payload Parsing Information (PPI) |

//  -----------------------------------

// | Payload Data                      |

//  -----------------------------------

// | Padding Data                      |

//  -----------------------------------

// PPI_FLAG - Payload parsing information flags

#define ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT 1

#define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_BYTE  0x02 //0000 0010

#define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_WORD  0x04 //0000 0100

#define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_DWORD 0x06 //0000 0110

#define ASF_PPI_MASK_SEQUENCE_FIELD_SIZE     0x06 //0000 0110

#define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE  0x08 //0000 1000

#define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD  0x10 //0001 0000

#define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_DWORD 0x18 //0001 1000

#define ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE     0x18 //0001 1000

#define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_BYTE  0x20 //0010 0000

#define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_WORD  0x40 //0100 0000

#define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_DWORD 0x60 //0110 0000

#define ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE     0x60 //0110 0000

// PL_FLAG - Payload flags

#define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE   0x01 //0000 0001

#define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_WORD   0x02 //0000 0010

#define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_DWORD  0x03 //0000 0011

#define ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE      0x03 //0000 0011

#define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_BYTE  0x04 //0000 0100

#define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_WORD  0x08 //0000 1000

#define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD 0x0c //0000 1100

#define ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE     0x0c //0000 1100

#define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE  0x10 //0001 0000

#define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_WORD  0x20 //0010 0000

#define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_DWORD 0x30 //0011 0000

#define ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE     0x30 //0011 0000

#define ASF_PL_FLAG_STREAM_NUMBER_LENGTH_FIELD_IS_BYTE  0x40 //0100 0000

#define ASF_PL_MASK_STREAM_NUMBER_LENGTH_FIELD_SIZE     0xc0 //1100 0000

#define ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_BYTE  0x40 //0100 0000

#define ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD  0x80 //1000 0000

#define ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE     0xc0 //1100 0000

#define ASF_PL_FLAG_KEY_FRAME 0x80 //1000 0000