For more information on the ALAC format, visit: http://crazney.net/programs/itunes/alac.html
Note: This decoder expects a 36- (0x24-)byte QuickTime atom to be passed through the extradata[_size] fields. This atom is tacked onto the end of an 'alac' stsd atom and has the following format: bytes 0-3 atom size (0x24), big-endian bytes 4-7 atom type ('alac', not the 'alac' tag from start of stsd) bytes 8-35 data bytes needed by decoder
Extradata: 32bit size 32bit tag (=alac) 32bit zero? 32bit max sample per frame 8bit ?? (zero?) 8bit sample size 8bit history mult 8bit initial history 8bit kmodifier 8bit channels? 16bit ?? 32bit max coded frame size 32bit bitrate? 32bit samplerate
Definition in file alac.c.
Go to the source code of this file.
Classes | |
| struct | ALACContext |
Functions | |
| static void | allocate_buffers (ALACContext *alac) |
| static int | alac_set_info (ALACContext *alac) |
| static int | count_leading_zeros (int32_t input) |
| static void | bastardized_rice_decompress (ALACContext *alac, int32_t *output_buffer, int output_size, int readsamplesize, int rice_initialhistory, int rice_kmodifier, int rice_historymult, int rice_kmodifier_mask) |
| static int32_t | extend_sign32 (int32_t val, int bits) |
| static int | sign_only (int v) |
| static void | predictor_decompress_fir_adapt (int32_t *error_buffer, int32_t *buffer_out, int output_size, int readsamplesize, int16_t *predictor_coef_table, int predictor_coef_num, int predictor_quantitization) |
| static void | reconstruct_stereo_16 (int32_t *buffer[MAX_CHANNELS], int16_t *buffer_out, int numchannels, int numsamples, uint8_t interlacing_shift, uint8_t interlacing_leftweight) |
| static int | alac_decode_frame (AVCodecContext *avctx, void *outbuffer, int *outputsize, uint8_t *inbuffer, int input_buffer_size) |
| static int | alac_decode_init (AVCodecContext *avctx) |
| static int | alac_decode_close (AVCodecContext *avctx) |
Variables | |
| AVCodec | alac_decoder |
| static void allocate_buffers | ( | ALACContext * | alac | ) | [static] |
Definition at line 96 of file alac.c.
Referenced by alac_set_info(), flac_decode_init(), metadata_parse(), and shorten_decode_frame().
| static int alac_set_info | ( | ALACContext * | alac | ) | [static] |
| static int count_leading_zeros | ( | int32_t | input | ) | [inline, static] |
| static void bastardized_rice_decompress | ( | ALACContext * | alac, | |
| int32_t * | output_buffer, | |||
| int | output_size, | |||
| int | readsamplesize, | |||
| int | rice_initialhistory, | |||
| int | rice_kmodifier, | |||
| int | rice_historymult, | |||
| int | rice_kmodifier_mask | |||
| ) | [static] |
Definition at line 267 of file alac.c.
Referenced by alac_decode_frame(), and predictor_decompress_fir_adapt().
| static int sign_only | ( | int | v | ) | [inline, static] |
| static int alac_decode_frame | ( | AVCodecContext * | avctx, | |
| void * | outbuffer, | |||
| int * | outputsize, | |||
| uint8_t * | inbuffer, | |||
| int | input_buffer_size | |||
| ) | [static] |
| static int alac_decode_init | ( | AVCodecContext * | avctx | ) | [static] |
| static int alac_decode_close | ( | AVCodecContext * | avctx | ) | [static] |
Initial value:
{
"alac",
CODEC_TYPE_AUDIO,
CODEC_ID_ALAC,
sizeof(ALACContext),
alac_decode_init,
NULL,
alac_decode_close,
alac_decode_frame,
}
1.5.5