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FFmpeg
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FFmpeg
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Go to the source code of this file.
Data Structures | |
| struct | FilterParams |
| filter data More... | |
| struct | ChannelParams |
| sample data coding information More... | |
Macros | |
| #define | MAX_MATRIX_CHANNEL_MLP 5 |
| Last possible matrix channel for each codec. | |
| #define | MAX_MATRIX_CHANNEL_TRUEHD 7 |
| #define | MAX_CHANNELS 8 |
| Maximum number of channels in a valid stream. | |
| #define | MAX_MATRICES_MLP 6 |
| Maximum number of matrices used in decoding; most streams have one matrix per output channel, but some rematrix a channel (usually 0) more than once. | |
| #define | MAX_MATRICES_TRUEHD 8 |
| #define | MAX_MATRICES 8 |
| #define | MAX_SUBSTREAMS 3 |
| Maximum number of substreams that can be decoded. | |
| #define | MAX_RATEFACTOR 4 |
| which multiple of 48000 the maximum sample rate is | |
| #define | MAX_SAMPLERATE (MAX_RATEFACTOR * 48000) |
| maximum sample frequency seen in files | |
| #define | MAX_BLOCKSIZE (40 * MAX_RATEFACTOR) |
| maximum number of audio samples within one access unit | |
| #define | MAX_BLOCKSIZE_POW2 (64 * MAX_RATEFACTOR) |
| next power of two greater than MAX_BLOCKSIZE | |
| #define | NUM_FILTERS 2 |
| number of allowed filters | |
| #define | MAX_FIR_ORDER 8 |
| The maximum number of taps in IIR and FIR filters. | |
| #define | MAX_IIR_ORDER 4 |
| #define | END_OF_STREAM 0xd234d234 |
| Code that signals end of a stream. | |
| #define | FIR 0 |
| #define | IIR 1 |
Functions | |
| uint8_t | ff_mlp_checksum8 (const uint8_t *buf, unsigned int buf_size) |
| MLP uses checksums that seem to be based on the standard CRC algorithm, but are not (in implementation terms, the table lookup and XOR are reversed). | |
| uint16_t | ff_mlp_checksum16 (const uint8_t *buf, unsigned int buf_size) |
| uint8_t | ff_mlp_restart_checksum (const uint8_t *buf, unsigned int bit_size) |
| Calculate an 8-bit checksum over a restart header – a non-multiple-of-8 number of bits, starting two bits into the first byte of buf. | |
| uint8_t | ff_mlp_calculate_parity (const uint8_t *buf, unsigned int buf_size) |
| XOR together all the bytes of a buffer. | |
| void | ff_mlp_init_crc (void) |
| static uint8_t | xor_32_to_8 (uint32_t value) |
| XOR four bytes into one. | |
Variables | |
| const uint8_t | ff_mlp_huffman_tables [3][18][2] |
| Tables defining the Huffman codes. | |
| #define MAX_MATRIX_CHANNEL_MLP 5 |
Last possible matrix channel for each codec.
Definition at line 30 of file mlp.h.
Referenced by read_restart_header().
| #define MAX_MATRIX_CHANNEL_TRUEHD 7 |
Definition at line 31 of file mlp.h.
Referenced by read_restart_header().
| #define MAX_CHANNELS 8 |
| #define MAX_MATRICES_MLP 6 |
Maximum number of matrices used in decoding; most streams have one matrix per output channel, but some rematrix a channel (usually 0) more than once.
Definition at line 41 of file mlp.h.
Referenced by read_matrix_params().
| #define MAX_MATRICES_TRUEHD 8 |
Definition at line 42 of file mlp.h.
Referenced by read_matrix_params().
| #define MAX_SUBSTREAMS 3 |
Maximum number of substreams that can be decoded.
MLP's limit is 2. TrueHD supports at least up to 3.
Definition at line 48 of file mlp.h.
Referenced by mlp_decode_init(), read_access_unit(), and read_major_sync().
| #define MAX_RATEFACTOR 4 |
| #define MAX_SAMPLERATE (MAX_RATEFACTOR * 48000) |
maximum sample frequency seen in files
Definition at line 53 of file mlp.h.
Referenced by read_major_sync().
| #define MAX_BLOCKSIZE (40 * MAX_RATEFACTOR) |
| #define MAX_BLOCKSIZE_POW2 (64 * MAX_RATEFACTOR) |
next power of two greater than MAX_BLOCKSIZE
Definition at line 58 of file mlp.h.
Referenced by read_major_sync().
| #define NUM_FILTERS 2 |
| #define MAX_FIR_ORDER 8 |
The maximum number of taps in IIR and FIR filters.
Definition at line 64 of file mlp.h.
Referenced by filter_channel(), mlp_filter_channel(), and read_filter_params().
| #define MAX_IIR_ORDER 4 |
Definition at line 65 of file mlp.h.
Referenced by filter_channel(), and read_filter_params().
| #define END_OF_STREAM 0xd234d234 |
| #define FIR 0 |
Definition at line 70 of file mlp.h.
Referenced by filter_channel(), read_channel_params(), read_filter_params(), and read_restart_header().
| #define IIR 1 |
Definition at line 71 of file mlp.h.
Referenced by filter_channel(), read_channel_params(), and read_restart_header().
MLP uses checksums that seem to be based on the standard CRC algorithm, but are not (in implementation terms, the table lookup and XOR are reversed).
We can implement this behavior using a standard av_crc on all but the last element, then XOR that with the last element.
Definition at line 73 of file mlp.c.
Referenced by read_access_unit().
| uint16_t ff_mlp_checksum16 | ( | const uint8_t * | buf, |
| unsigned int | buf_size | ||
| ) |
Definition at line 64 of file mlp.c.
Referenced by ff_mlp_read_major_sync().
Calculate an 8-bit checksum over a restart header – a non-multiple-of-8 number of bits, starting two bits into the first byte of buf.
Definition at line 80 of file mlp.c.
Referenced by read_restart_header().
XOR together all the bytes of a buffer.
Does this belong in dspcontext?
Definition at line 99 of file mlp.c.
Referenced by read_access_unit().
Definition at line 54 of file mlp.c.
Referenced by init_static(), and mlp_init().
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inlinestatic |
XOR four bytes into one.
Definition at line 120 of file mlp.h.
Referenced by ff_mlp_calculate_parity(), and read_restart_header().
| const uint8_t ff_mlp_huffman_tables[3][18][2] |
Tables defining the Huffman codes.
There are three entropy coding methods used in MLP (four if you count "none" as a method). These use the same sequences for codes starting with 00 or 01, but have different codes starting with 1.
Definition at line 28 of file mlp.c.
Referenced by init_static().
1.8.2