-static int SyncInfo16be( const uint8_t *p_buf,
- unsigned int *pi_audio_mode,
- unsigned int *pi_sample_rate,
- unsigned int *pi_bit_rate,
- unsigned int *pi_frame_length )
-{
- unsigned int i_frame_size;
- unsigned int i_lfe;
-
- *pi_frame_length = (p_buf[4] & 0x01) << 6 | (p_buf[5] >> 2);
- i_frame_size = (p_buf[5] & 0x03) << 12 | (p_buf[6] << 4) |
- (p_buf[7] >> 4);
-
- *pi_audio_mode = (p_buf[7] & 0x0f) << 2 | (p_buf[8] >> 6);
- *pi_sample_rate = (p_buf[8] >> 2) & 0x0f;
- *pi_bit_rate = (p_buf[8] & 0x03) << 3 | ((p_buf[9] >> 5) & 0x07);
-
- i_lfe = (p_buf[10] >> 1) & 0x03;
- if( i_lfe ) *pi_audio_mode |= 0x10000;
-
- return i_frame_size + 1;
-}
-
-static void BufLeToBe( uint8_t *p_out, const uint8_t *p_in, int i_in )
-{
- int i;
-
- for( i = 0; i < i_in/2; i++ )
- {
- p_out[i*2] = p_in[i*2+1];
- p_out[i*2+1] = p_in[i*2];
- }
-}
-
-static int Buf14To16( uint8_t *p_out, const uint8_t *p_in, int i_in, int i_le )
-{
- unsigned char tmp, cur = 0;
- int bits_in, bits_out = 0;
- int i, i_out = 0;
-
- for( i = 0; i < i_in; i++ )
- {
- if( i%2 )
- {
- tmp = p_in[i-i_le];
- bits_in = 8;
- }
- else
- {
- tmp = p_in[i+i_le] & 0x3F;
- bits_in = 8 - 2;
- }
-
- if( bits_out < 8 )
- {
- int need = __MIN( 8 - bits_out, bits_in );
- cur <<= need;
- cur |= ( tmp >> (bits_in - need) );
- tmp <<= (8 - bits_in + need);
- tmp >>= (8 - bits_in + need);
- bits_in -= need;
- bits_out += need;
- }
-
- if( bits_out == 8 )
- {
- p_out[i_out] = cur;
- cur = 0;
- bits_out = 0;
- i_out++;
- }
-
- bits_out += bits_in;
- cur <<= bits_in;
- cur |= tmp;
- }
-
- return i_out;
-}
-
-static inline int SyncCode( const uint8_t *p_buf )
-{
- /* 14 bits, little endian version of the bitstream */
- if( p_buf[0] == 0xff && p_buf[1] == 0x1f &&
- p_buf[2] == 0x00 && p_buf[3] == 0xe8 &&
- (p_buf[4] & 0xf0) == 0xf0 && p_buf[5] == 0x07 )
- {
- return VLC_SUCCESS;
- }
- /* 14 bits, big endian version of the bitstream */
- else if( p_buf[0] == 0x1f && p_buf[1] == 0xff &&
- p_buf[2] == 0xe8 && p_buf[3] == 0x00 &&
- p_buf[4] == 0x07 && (p_buf[5] & 0xf0) == 0xf0 )
- {
- return VLC_SUCCESS;
- }
- /* 16 bits, big endian version of the bitstream */
- else if( p_buf[0] == 0x7f && p_buf[1] == 0xfe &&
- p_buf[2] == 0x80 && p_buf[3] == 0x01 )
- {
- return VLC_SUCCESS;
- }
- /* 16 bits, little endian version of the bitstream */
- else if( p_buf[0] == 0xfe && p_buf[1] == 0x7f &&
- p_buf[2] == 0x01 && p_buf[3] == 0x80 )
- {
- return VLC_SUCCESS;
- }
- /* DTS-HD */
- else if( p_buf[0] == 0x64 && p_buf[1] == 0x58 &&
- p_buf[2] == 0x20 && p_buf[3] == 0x25 )
- {
- return VLC_SUCCESS;
- }
-
- return VLC_EGENERIC;
-}
-