hvirtual/quicktime/ffmpeg/libavcodec/shorten.c File Reference

#include <limits.h>
#include "avcodec.h"
#include "bitstream.h"
#include "golomb.h"

Include dependency graph for shorten.c:

Go to the source code of this file.

Data Structures

struct ShortenContext

Defines

#define DEBUG

#define MAX_CHANNELS   8

#define MAX_BLOCKSIZE   65535

#define OUT_BUFFER_SIZE   16384

#define ULONGSIZE   2

#define WAVE_FORMAT_PCM   0x0001

#define DEFAULT_BLOCK_SIZE   256

#define TYPESIZE   4

#define CHANSIZE   0

#define LPCQSIZE   2

#define ENERGYSIZE   3

#define BITSHIFTSIZE   2

#define TYPE_S16HL   3

#define TYPE_S16LH   5

#define NWRAP   3

#define NSKIPSIZE   1

#define LPCQUANT   5

#define V2LPCQOFFSET   (1 << LPCQUANT)

#define FNSIZE   2

#define FN_DIFF0   0

#define FN_DIFF1   1

#define FN_DIFF2   2

#define FN_DIFF3   3

#define FN_QUIT   4

#define FN_BLOCKSIZE   5

#define FN_BITSHIFT   6

#define FN_QLPC   7

#define FN_ZERO   8

#define FN_VERBATIM   9

#define VERBATIM_CKSIZE_SIZE   5

#define VERBATIM_BYTE_SIZE   8

#define CANONICAL_HEADER_SIZE   44

Functions

static int shorten_decode_init (AVCodecContext *avctx)

static void allocate_buffers (ShortenContext *s)

static unsigned int get_uint (ShortenContext *s, int k)

static void fix_bitshift (ShortenContext *s, int32_t *buffer)

static void init_offset (ShortenContext *s)

static int get_le32 (GetBitContext *gb)

static short get_le16 (GetBitContext *gb)

static int decode_wave_header (AVCodecContext *avctx, uint8_t *header, int header_size)

static int16_t * interleave_buffer (int16_t *samples, int nchan, int blocksize, int32_t **buffer)

static void decode_subframe_lpc (ShortenContext *s, int channel, int residual_size, int pred_order)

static int shorten_decode_frame (AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)

static int shorten_decode_close (AVCodecContext *avctx)

static void shorten_flush (AVCodecContext *avctx)

Variables

AVCodec shorten_decoder

Detailed Description

Shorten decoder

Author:: Jeff Muizelaar

Definition in file shorten.c.

Define Documentation

#define BITSHIFTSIZE 2

Definition at line 48 of file shorten.c.

Referenced by shorten_decode_frame().

#define CANONICAL_HEADER_SIZE 44

Definition at line 73 of file shorten.c.

Referenced by shorten_decode_frame().

#define CHANSIZE 0

Definition at line 45 of file shorten.c.

Referenced by shorten_decode_frame().

#define DEBUG

Definition at line 27 of file shorten.c.

#define DEFAULT_BLOCK_SIZE 256

Definition at line 42 of file shorten.c.

Referenced by shorten_decode_frame().

#define ENERGYSIZE 3

Definition at line 47 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_BITSHIFT 6

Definition at line 66 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_BLOCKSIZE 5

Definition at line 65 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF0 0

Definition at line 60 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF1 1

Definition at line 61 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF2 2

Definition at line 62 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_DIFF3 3

Definition at line 63 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_QLPC 7

Definition at line 67 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_QUIT 4

Definition at line 64 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_VERBATIM 9

Definition at line 69 of file shorten.c.

Referenced by shorten_decode_frame().

#define FN_ZERO 8

Definition at line 68 of file shorten.c.

Referenced by shorten_decode_frame().

#define FNSIZE 2

Definition at line 59 of file shorten.c.

Referenced by shorten_decode_frame().

#define LPCQSIZE 2

Definition at line 46 of file shorten.c.

Referenced by shorten_decode_frame().

#define LPCQUANT 5

Definition at line 56 of file shorten.c.

Referenced by decode_subframe_lpc().

#define MAX_BLOCKSIZE 65535

Definition at line 34 of file shorten.c.

#define MAX_CHANNELS 8

Definition at line 33 of file shorten.c.

#define NSKIPSIZE 1

Definition at line 54 of file shorten.c.

Referenced by shorten_decode_frame().

#define NWRAP 3

Definition at line 53 of file shorten.c.

Referenced by shorten_decode_frame().

#define OUT_BUFFER_SIZE 16384

Definition at line 36 of file shorten.c.

Referenced by shorten_decode_frame().

#define TYPE_S16HL 3

Definition at line 50 of file shorten.c.

Referenced by init_offset().

#define TYPE_S16LH 5

Definition at line 51 of file shorten.c.

Referenced by init_offset().

#define TYPESIZE 4

Definition at line 44 of file shorten.c.

Referenced by shorten_decode_frame().

#define ULONGSIZE 2

Definition at line 38 of file shorten.c.

Referenced by get_uint().

#define V2LPCQOFFSET (1 << LPCQUANT)

Definition at line 57 of file shorten.c.

Referenced by shorten_decode_frame().

#define VERBATIM_BYTE_SIZE 8

Definition at line 72 of file shorten.c.

Referenced by shorten_decode_frame().

#define VERBATIM_CKSIZE_SIZE 5

Definition at line 71 of file shorten.c.

Referenced by shorten_decode_frame().

#define WAVE_FORMAT_PCM 0x0001

Definition at line 40 of file shorten.c.

Referenced by decode_wave_header().

Function Documentation

static void allocate_buffers ( ShortenContext * s ) [static]

Definition at line 109 of file shorten.c.

References av_realloc(), ShortenContext::blocksize, ShortenContext::channels, ShortenContext::decoded, ShortenContext::nmean, ShortenContext::nwrap, and ShortenContext::offset.

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static void decode_subframe_lpc	(	ShortenContext *	s,
		int	channel,
		int	residual_size,
		int	pred_order
	)			`[static]`

Definition at line 241 of file shorten.c.

References ShortenContext::blocksize, ShortenContext::decoded, ShortenContext::gb, get_sr_golomb_shorten(), ShortenContext::lpcqoffset, and LPCQUANT.

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static int decode_wave_header	(	AVCodecContext *	avctx,
		uint8_t *	header,
		int	header_size
	)			`[static]`

Definition at line 174 of file shorten.c.

References av_log(), AV_LOG_ERROR, AV_LOG_INFO, AVCodecContext::bit_rate, AVCodecContext::bits_per_sample, AVCodecContext::block_align, AVCodecContext::channels, get_le16(), get_le32(), init_get_bits(), AVCodecContext::sample_rate, skip_bits(), and WAVE_FORMAT_PCM.

Referenced by shorten_decode_frame().

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static void fix_bitshift	(	ShortenContext *	s,
		int32_t *	buffer
	)			`[static]`

Definition at line 132 of file shorten.c.

References ShortenContext::bitshift, ShortenContext::blocksize, and ShortenContext::nwrap.

Referenced by shorten_decode_frame().

static short get_le16 ( GetBitContext * gb ) [inline, static]

Definition at line 169 of file shorten.c.

References bswap_16(), and get_bits_long().

Referenced by decode_wave_header().

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static int get_le32 ( GetBitContext * gb ) [inline, static]

Definition at line 164 of file shorten.c.

References bswap_32(), and get_bits_long().

Referenced by decode_wave_header().

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static unsigned int get_uint	(	ShortenContext *	s,
		int	k
	)			`[inline, static]`

Definition at line 124 of file shorten.c.

References ShortenContext::gb, get_ur_golomb_shorten(), ULONGSIZE, and ShortenContext::version.

Referenced by shorten_decode_frame().

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static void init_offset ( ShortenContext * s ) [static]

Definition at line 142 of file shorten.c.

References av_log(), AV_LOG_ERROR, ShortenContext::avctx, ShortenContext::channels, ShortenContext::internal_ftype, ShortenContext::nmean, ShortenContext::offset, TYPE_S16HL, and TYPE_S16LH.

Referenced by shorten_decode_frame().

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static int16_t* interleave_buffer	(	int16_t *	samples,
		int	nchan,
		int	blocksize,
		int32_t **	buffer
	)			`[static]`

Definition at line 233 of file shorten.c.

Referenced by shorten_decode_frame().

static int shorten_decode_close ( AVCodecContext * avctx ) [static]

Definition at line 490 of file shorten.c.

References av_freep(), ShortenContext::bitstream, ShortenContext::channels, ShortenContext::decoded, ShortenContext::nwrap, ShortenContext::offset, AVCodecContext::priv_data, and s.

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static int shorten_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		uint8_t *	buf,
		int	buf_size
	)			`[static]`

Definition at line 258 of file shorten.c.

References allocate_buffers(), ShortenContext::allocated_bitstream_size, av_fast_realloc(), av_log(), AV_LOG_ERROR, ShortenContext::avctx, ShortenContext::bitindex, ShortenContext::bitshift, BITSHIFTSIZE, ShortenContext::bitstream, ShortenContext::bitstream_index, ShortenContext::bitstream_size, ShortenContext::blocksize, bswap_32(), CANONICAL_HEADER_SIZE, ShortenContext::channels, CHANSIZE, ShortenContext::cur_chan, decode_subframe_lpc(), decode_wave_header(), ShortenContext::decoded, DEFAULT_BLOCK_SIZE, ENERGYSIZE, fix_bitshift(), FN_BITSHIFT, FN_BLOCKSIZE, FN_DIFF0, FN_DIFF1, FN_DIFF2, FN_DIFF3, FN_QLPC, FN_QUIT, FN_VERBATIM, FN_ZERO, FNSIZE, ShortenContext::gb, get_bits(), get_bits_count(), get_bits_long(), get_sr_golomb_shorten(), get_uint(), get_ur_golomb_shorten(), ShortenContext::header, ShortenContext::header_size, init_get_bits(), init_offset(), interleave_buffer(), ShortenContext::internal_ftype, ShortenContext::lpcqoffset, LPCQSIZE, MAX_CHANNELS, ShortenContext::max_framesize, memcpy, ShortenContext::nmean, NSKIPSIZE, NWRAP, ShortenContext::nwrap, ShortenContext::offset, OUT_BUFFER_SIZE, AVCodecContext::priv_data, s, samples, skip_bits(), TYPESIZE, V2LPCQOFFSET, VERBATIM_BYTE_SIZE, VERBATIM_CKSIZE_SIZE, and ShortenContext::version.

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static int shorten_decode_init ( AVCodecContext * avctx ) [static]

Definition at line 101 of file shorten.c.

References ShortenContext::avctx, AVCodecContext::priv_data, and s.

static void shorten_flush ( AVCodecContext * avctx ) [static]

Definition at line 504 of file shorten.c.

References ShortenContext::bitstream_index, ShortenContext::bitstream_size, AVCodecContext::priv_data, and s.

Variable Documentation

AVCodec shorten_decoder

Initial value:

 {
    "shorten",
    CODEC_TYPE_AUDIO,
    CODEC_ID_SHORTEN,
    sizeof(ShortenContext),
    shorten_decode_init,
    NULL,
    shorten_decode_close,
    shorten_decode_frame,
    .flush= shorten_flush,
}

Definition at line 511 of file shorten.c.

Referenced by avcodec_register_all().

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