dss.c File Reference

#include "libavutil/attributes.h"
#include "libavutil/bswap.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	DSSDemuxContext

Macros
#define	DSS_HEAD_OFFSET_AUTHOR   0xc
#define	DSS_AUTHOR_SIZE   16
#define	DSS_HEAD_OFFSET_START_TIME   0x26
#define	DSS_HEAD_OFFSET_END_TIME   0x32
#define	DSS_TIME_SIZE   12
#define	DSS_HEAD_OFFSET_ACODEC   0x2a4
#define	DSS_ACODEC_DSS_SP   0x0 /* SP mode */
#define	DSS_ACODEC_G723_1   0x2 /* LP mode */
#define	DSS_HEAD_OFFSET_COMMENT   0x31e
#define	DSS_COMMENT_SIZE   64
#define	DSS_BLOCK_SIZE   512
#define	DSS_HEADER_SIZE   (DSS_BLOCK_SIZE * 2)
#define	DSS_AUDIO_BLOCK_HEADER_SIZE   6
#define	DSS_FRAME_SIZE   42

Functions
static int	dss_probe (AVProbeData *p)
static int	dss_read_metadata_date (AVFormatContext *s, unsigned int offset, const char *key)
static int	dss_read_metadata_string (AVFormatContext *s, unsigned int offset, unsigned int size, const char *key)
static int	dss_read_header (AVFormatContext *s)
static void	dss_skip_audio_header (AVFormatContext *s, AVPacket *pkt)
static void	dss_sp_byte_swap (DSSDemuxContext *ctx, uint8_t *dst, const uint8_t *src)
static int	dss_sp_read_packet (AVFormatContext *s, AVPacket *pkt)
static int	dss_723_1_read_packet (AVFormatContext *s, AVPacket *pkt)
static int	dss_read_packet (AVFormatContext *s, AVPacket *pkt)
static int	dss_read_close (AVFormatContext *s)
static int	dss_read_seek (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

Variables
static const uint8_t	frame_size [4] = { 24, 20, 4, 1 }
AVInputFormat	ff_dss_demuxer

Macro Definition Documentation

#define DSS_HEAD_OFFSET_AUTHOR   0xc

Definition at line 30 of file dss.c.

Referenced by dss_read_header().

#define DSS_AUTHOR_SIZE   16

Definition at line 31 of file dss.c.

Referenced by dss_read_header().

#define DSS_HEAD_OFFSET_START_TIME   0x26

Definition at line 33 of file dss.c.

#define DSS_HEAD_OFFSET_END_TIME   0x32

Definition at line 34 of file dss.c.

Referenced by dss_read_header().

#define DSS_TIME_SIZE   12

Definition at line 35 of file dss.c.

Referenced by dss_read_metadata_date().

#define DSS_HEAD_OFFSET_ACODEC   0x2a4

Definition at line 37 of file dss.c.

Referenced by dss_read_header().

#define DSS_ACODEC_DSS_SP   0x0 /* SP mode */

Definition at line 38 of file dss.c.

Referenced by dss_read_header(), dss_read_packet(), and dss_read_seek().

#define DSS_ACODEC_G723_1   0x2 /* LP mode */

Definition at line 39 of file dss.c.

Referenced by dss_read_header().

#define DSS_HEAD_OFFSET_COMMENT   0x31e

Definition at line 41 of file dss.c.

Referenced by dss_read_header().

#define DSS_COMMENT_SIZE   64

Definition at line 42 of file dss.c.

Referenced by dss_read_header().

#define DSS_BLOCK_SIZE   512

Definition at line 44 of file dss.c.

Referenced by dss_read_seek(), and dss_skip_audio_header().

#define DSS_HEADER_SIZE   (DSS_BLOCK_SIZE * 2)

Definition at line 45 of file dss.c.

Referenced by dss_read_header(), and dss_read_seek().

#define DSS_AUDIO_BLOCK_HEADER_SIZE   6

Definition at line 46 of file dss.c.

Referenced by dss_read_seek(), and dss_skip_audio_header().

#define DSS_FRAME_SIZE   42

Definition at line 47 of file dss.c.

Referenced by dss_read_header(), dss_sp_byte_swap(), and dss_sp_read_packet().

Function Documentation

static int dss_probe ( AVProbeData *  p )

static

Definition at line 61 of file dss.c.

static int dss_read_metadata_date ( AVFormatContext *  s, unsigned int  offset, const char *  key  )

static

Definition at line 69 of file dss.c.

Referenced by dss_read_header().

static int dss_read_metadata_string ( AVFormatContext *  s, unsigned int  offset, unsigned int  size, const char *  key  )

static

Definition at line 92 of file dss.c.

Referenced by dss_read_header().

static int dss_read_header ( AVFormatContext *  s )

static

Definition at line 118 of file dss.c.

static void dss_skip_audio_header ( AVFormatContext *  s, AVPacket *  pkt  )

static

Definition at line 180 of file dss.c.

Referenced by dss_723_1_read_packet(), and dss_sp_read_packet().

static void dss_sp_byte_swap ( DSSDemuxContext *  ctx, uint8_t *  dst, const uint8_t *  src  )

static

Definition at line 189 of file dss.c.

Referenced by dss_sp_read_packet().

static int dss_sp_read_packet ( AVFormatContext *  s, AVPacket *  pkt  )

static

Definition at line 212 of file dss.c.

Referenced by dss_read_packet().

static int dss_723_1_read_packet ( AVFormatContext *  s, AVPacket *  pkt  )

static

Definition at line 274 of file dss.c.

Referenced by dss_read_packet().

static int dss_read_packet ( AVFormatContext *  s, AVPacket *  pkt  )

static

Definition at line 329 of file dss.c.

static int dss_read_close ( AVFormatContext *  s )

static

Definition at line 339 of file dss.c.

static int dss_read_seek ( AVFormatContext *  s, int  stream_index, int64_t  timestamp, int  flags  )

static

Definition at line 348 of file dss.c.

Variable Documentation

const uint8_t frame_size[4] = { 24, 20, 4, 1 }

static

Definition at line 49 of file dss.c.

Referenced by dss_723_1_read_packet().

AVInputFormat ff_dss_demuxer

Initial value:

= {
    .name           = "dss",
    .long_name      = NULL_IF_CONFIG_SMALL("Digital Speech Standard (DSS)"),
    .priv_data_size = sizeof(DSSDemuxContext),
    .read_probe     = dss_probe,
    .read_header    = dss_read_header,
    .read_packet    = dss_read_packet,
    .read_close     = dss_read_close,
    .read_seek      = dss_read_seek,
    .extensions     = "dss"
}

Definition at line 387 of file dss.c.