ts.c

这不是一个完整的工程

        if(  p_stream->i_pid == p_pcr_stream->i_pid &&
             p_stream->chain_ts.p_first == NULL )
        {
            p_sys->i_length+= i_length;
            if( p_sys->chain_ts.p_first == NULL )
            {
                p_sys->i_dts    = i_dts;
                p_sys->i_pcr    = i_dts;
                b_pcr = VLC_TRUE;
            }
            else if( p_sys->i_pcr_soft_delay > 0 &&
                     p_sys->i_pcr + p_sys->i_pcr_soft_delay < i_dts )
            {
                p_sys->i_pcr    = i_dts;
                b_pcr = VLC_TRUE;
                b_pcr_soft = VLC_TRUE;
            }
            break;
        }

        if( ( p_sys->i_dts + p_sys->i_length ) - i_dts > 2000000 ||
            ( p_sys->i_dts + p_sys->i_length ) - i_dts < -2000000 )
        {
            msg_Err( p_mux, "| buffer_dts - pcr_pts | > 2s ("I64Fd") empting "
                     "pcr TS buffers", p_sys->i_dts + p_sys->i_length - i_dts);

            sout_BufferDelete( p_mux->p_sout, p_data );

            while( ( p_data = BufferChainGet( &p_pcr_stream->chain_ts ) ) )
            {
                sout_BufferDelete( p_mux->p_sout, p_data );
            }
            while( ( p_data = BufferChainGet( &p_sys->chain_ts ) ) )
            {
                sout_BufferDelete( p_mux->p_sout, p_data );
            }
            return VLC_EGENERIC;
        }

        if( i_dts >= p_sys->i_dts )
        {
            break;
        }

        msg_Dbg( p_mux, "dropping buffer size=%d dts="I64Fd" pcr_dts="I64Fd
                 " diff="I64Fd, p_data->i_size, i_dts, p_sys->i_dts,
                 p_sys->i_dts + p_sys->i_length - i_dts );
        sout_BufferDelete( p_mux->p_sout, p_data );
    }

    E_( EStoPES )( p_mux->p_sout, &p_data, p_data, p_stream->i_stream_id, 1);

    BufferChainInit( &p_stream->chain_ts );
    PEStoTS( p_mux->p_sout, &p_stream->chain_ts, p_data, p_stream, b_pcr );

    TSSetDate( &p_stream->chain_ts, i_dts, i_length );

    if( b_pcr_soft && p_stream->chain_ts.p_first )
    {
        p_stream->chain_ts.p_first->i_flags=SOUT_BUFFER_FLAGS_PRIVATE_PCR_SOFT;
    }

    return VLC_SUCCESS;
}

static void TSSetConstraints( sout_mux_t *p_mux, sout_buffer_chain_t *c, mtime_t i_length, int i_bitrate_min, int i_bitrate_max )
{
    sout_mux_sys_t  *p_sys = p_mux->p_sys;
    sout_buffer_chain_t s = *c;

    int i_packets = 0;
    int i_packets_min = 0;
    int i_packets_max = 0;

    if( i_length <= 0 )
    {
        return;
    }

    i_packets     = c->i_depth;
    i_packets_min = ( (int64_t)i_bitrate_min * i_length / 8 / 1000000  + 187 ) / 188;
    i_packets_max = ( (int64_t)i_bitrate_max * i_length / 8 / 1000000  + 187 ) / 188;

    if( i_packets < i_packets_min && i_packets_min > 0 )
    {
        sout_buffer_t *p_pk;
        int i_div = ( i_packets_min - i_packets ) / i_packets;
        int i_mod = ( i_packets_min - i_packets ) % i_packets;
        int i_rest = 0;

        /* We need to pad with null packets (pid=0x1fff)
         * We try to melt null packets with true packets */
        msg_Dbg( p_mux,
                 "packets=%d but min=%d -> adding %d packets of padding",
                 i_packets, i_packets_min, i_packets_min - i_packets );

        BufferChainInit( c );
        while( ( p_pk = BufferChainGet( &s ) ) )
        {
            int i, i_null;

            BufferChainAppend( c, p_pk );

            i_null = i_div + ( i_rest + i_mod ) / i_packets;

            for( i = 0; i < i_null; i++ )
            {
                sout_buffer_t *p_null;

                p_null = sout_BufferNew( p_mux->p_sout, 188 );
                p_null->p_buffer[0] = 0x47;
                p_null->p_buffer[1] = 0x1f;
                p_null->p_buffer[2] = 0xff;
                p_null->p_buffer[3] = 0x10 | p_sys->i_null_continuity_counter;
                memset( &p_null->p_buffer[4], 0, 184 );
                p_sys->i_null_continuity_counter =
                    ( p_sys->i_null_continuity_counter + 1 ) % 16;

                BufferChainAppend( c, p_null );
            }

            i_rest = ( i_rest + i_mod ) % i_packets;
        }
    }
    else if( i_packets > i_packets_max && i_packets_max > 0 )
    {
        sout_buffer_t *p_pk;
        int           i;

        /* Arg, we need to drop packets, I don't do something clever (like
         * dropping complete pid, b frames, ... ), I just get the right amount
         * of packets and discard the others */
        msg_Warn( p_mux,
                  "packets=%d but max=%d -> removing %d packets -> stream broken",
                  i_packets, i_packets_max, i_packets - i_packets_max );

        BufferChainInit( c );
        for( i = 0; i < i_packets_max; i++ )
        {
            BufferChainAppend( c, BufferChainGet( &s ) );
        }

        while( ( p_pk = BufferChainGet( &s ) ) )
        {
            sout_BufferDelete( p_mux->p_sout, p_pk );
        }
    }
}

static void TSSetDate( sout_buffer_chain_t *c, mtime_t i_dts, mtime_t i_length )
{
    sout_buffer_t *p_ts;
    mtime_t       i_delta = i_length / c->i_depth;
    int           i_packet = 0;

    for( p_ts = c->p_first; p_ts != NULL; p_ts = p_ts->p_next )
    {
        p_ts->i_dts    = i_dts + i_packet * i_length / c->i_depth;  /* avoid rounding error */
        p_ts->i_length = i_delta;

        if( p_ts->i_flags&SOUT_BUFFER_FLAGS_PRIVATE_PCR_SOFT )
        {
            mtime_t i_pcr = 9 * p_ts->i_dts / 100;

            p_ts->p_buffer[6] = ( i_pcr >> 25 )&0xff;
            p_ts->p_buffer[7] = ( i_pcr >> 17 )&0xff;
            p_ts->p_buffer[8] = ( i_pcr >> 9  )&0xff;
            p_ts->p_buffer[9] = ( i_pcr >> 1  )&0xff;
            p_ts->p_buffer[10]= ( i_pcr << 7  )&0x80;
        }

        i_packet++;
    }
}

static void PEStoTS( sout_instance_t *p_sout,
                     sout_buffer_chain_t *c, sout_buffer_t *p_pes,
                     ts_stream_t *p_stream,
                     vlc_bool_t b_pcr )
{
    uint8_t *p_data;
    int     i_size;
    int     b_new_pes;

    /* get PES total size */
    i_size = p_pes->i_size;
    p_data = p_pes->p_buffer;

    /* Set pcr only with valid DTS */
    if( p_pes->i_dts <= 0 )
    {
        b_pcr = VLC_FALSE;
    }

    b_new_pes = VLC_TRUE;

    for( ;; )
    {
        int           b_adaptation_field;
        int           i_payload;
        int           i_copy;
        sout_buffer_t *p_ts;

        p_ts = sout_BufferNew( p_sout, 188 );
        /* write header
         * 8b   0x47    sync byte
         * 1b           transport_error_indicator
         * 1b           payload_unit_start
         * 1b           transport_priority
         * 13b          pid
         * 2b           transport_scrambling_control
         * 2b           if adaptation_field 0x03 else 0x01
         * 4b           continuity_counter
         */

        i_payload = 184 - ( b_pcr ? 8 : 0 );
        i_copy    = __MIN( i_size, i_payload );
        b_adaptation_field = (b_pcr||i_size<i_payload) ? VLC_TRUE : VLC_FALSE;

        p_ts->p_buffer[0] = 0x47;
        p_ts->p_buffer[1] = ( b_new_pes ? 0x40 : 0x00 )|
                            ( ( p_stream->i_pid >> 8 )&0x1f );
        p_ts->p_buffer[2] = p_stream->i_pid & 0xff;
        p_ts->p_buffer[3] = ( b_adaptation_field ? 0x30 : 0x10 )|
                            p_stream->i_continuity_counter;

        b_new_pes = VLC_FALSE;
        p_stream->i_continuity_counter = (p_stream->i_continuity_counter+1)%16;

        if( b_adaptation_field )
        {
            int i;

            if( b_pcr )
            {
                mtime_t i_pcr = p_pes->i_dts * 9 / 100;
                int     i_stuffing = i_payload - i_copy;

                p_ts->p_buffer[4] = 7 + i_stuffing;
                p_ts->p_buffer[5] = 0x10;   /* flags */
                p_ts->p_buffer[6] = ( i_pcr >> 25 )&0xff;
                p_ts->p_buffer[7] = ( i_pcr >> 17 )&0xff;
                p_ts->p_buffer[8] = ( i_pcr >> 9  )&0xff;
                p_ts->p_buffer[9] = ( i_pcr >> 1  )&0xff;
                p_ts->p_buffer[10]= ( i_pcr << 7  )&0x80;
                p_ts->p_buffer[11]= 0;

                b_pcr = VLC_FALSE;
                for( i = 12; i < 12 + i_stuffing; i++ )
                {
                    p_ts->p_buffer[i] = 0xff;
                }
            }
            else
            {
                int i_stuffing = i_payload - i_copy;

                p_ts->p_buffer[4] = i_stuffing - 1;
                if( i_stuffing > 1 )
                {
                    p_ts->p_buffer[5] = 0x00;
                    for( i = 6; i < 6 + i_stuffing - 2; i++ )
                    {
                        p_ts->p_buffer[i] = 0xff;
                    }
                }
            }
        }
        /* copy payload */
        memcpy( &p_ts->p_buffer[188 - i_copy], p_data, i_copy );
        p_data += i_copy;
        i_size -= i_copy;

        BufferChainAppend( c, p_ts );

        if( i_size <= 0 )
        {
            sout_buffer_t *p_next = p_pes->p_next;

            p_pes->p_next = NULL;
            sout_BufferDelete( p_sout, p_pes );
            if( p_next == NULL )
            {
                break;
            }
            b_new_pes = VLC_TRUE;
            p_pes = p_next;
            i_size = p_pes->i_size;
            p_data = p_pes->p_buffer;
        }
    }

    return;
}

#if defined MODULE_NAME_IS_mux_ts
static uint32_t CalculateCRC( uint8_t *p_begin, int i_count )
{
    static uint32_t CRC32[256] =
    {
        0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
        0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
        0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
        0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
        0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
        0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
        0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
        0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
        0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
        0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
        0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
        0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
        0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
        0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
        0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
        0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
        0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
        0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
        0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
        0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
        0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
        0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
        0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
        0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
        0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
        0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
        0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
        0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
        0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
        0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
        0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
        0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
        0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
        0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
        0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
        0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
        0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
        0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
        0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
        0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
        0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
        0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
        0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
        0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
        0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
        0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
        0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
        0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
        0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
        0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
        0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
        0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
        0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
        0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
        0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
        0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
        0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
        0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
        0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
        0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
        0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
        0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
        0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
        0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
    };

    uint32_t i_crc = 0xffffffff;

    /* Calculate the CRC */
    while( i_count > 0 )
    {
        i_crc = (i_crc<<8) ^ CRC32[ (i_crc>>24) ^ ((uint32_t)*p_begin) ];
        p_begin++;
        i_count--;