libavformat/rmdec.c File Reference

#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "riff.h"
#include "rm.h"

Go to the source code of this file.

Data Structures

struct  RMStream
struct  RMDemuxContext

Defines

#define DEINT_ID_GENR   MKTAG('g', 'e', 'n', 'r')
 interleaving for Cooker/Atrac
#define DEINT_ID_INT0   MKTAG('I', 'n', 't', '0')
 no interleaving needed
#define DEINT_ID_INT4   MKTAG('I', 'n', 't', '4')
 interleaving for 28.8
#define DEINT_ID_SIPR   MKTAG('s', 'i', 'p', 'r')
 interleaving for Sipro
#define DEINT_ID_VBRF   MKTAG('v', 'b', 'r', 'f')
 VBR case for AAC.
#define DEINT_ID_VBRS   MKTAG('v', 'b', 'r', 's')
 VBR case for AAC.
#define RAW_PACKET_SIZE   1000

Functions

static void get_strl (AVIOContext *pb, char *buf, int buf_size, int len)
static void get_str8 (AVIOContext *pb, char *buf, int buf_size)
static int rm_read_extradata (AVIOContext *pb, AVCodecContext *avctx, unsigned size)
static void rm_read_metadata (AVFormatContext *s, int wide)
RMStream * ff_rm_alloc_rmstream (void)
void ff_rm_free_rmstream (RMStream *rms)
static int rm_read_audio_stream_info (AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *ast, int read_all)
int ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *rst, int codec_data_size, const uint8_t *mime)
 Read the MDPR chunk, which contains stream-specific codec initialization parameters.
static int rm_read_index (AVFormatContext *s)
 this function assumes that the demuxer has already seeked to the start of the INDX chunk, and will bail out if not.
static int rm_read_header_old (AVFormatContext *s)
static int rm_read_header (AVFormatContext *s)
static int get_num (AVIOContext *pb, int *len)
static int sync (AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos)
static int rm_assemble_video_frame (AVFormatContext *s, AVIOContext *pb, RMDemuxContext *rm, RMStream *vst, AVPacket *pkt, int len, int *pseq, int64_t *timestamp)
static void rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
void ff_rm_reorder_sipr_data (uint8_t *buf, int sub_packet_h, int framesize)
 Perform 4-bit block reordering for SIPR data.
int ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *ast, int len, AVPacket *pkt, int *seq, int flags, int64_t timestamp)
 Parse one rm-stream packet from the input bytestream.
int ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb, AVStream *st, RMStream *ast, AVPacket *pkt)
 Retrieve one cached packet from the rm-context.
static int rm_read_packet (AVFormatContext *s, AVPacket *pkt)
static int rm_read_close (AVFormatContext *s)
static int rm_probe (AVProbeData *p)
static int64_t rm_read_dts (AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)

Variables

static const unsigned char sipr_swaps [38][2]
const unsigned char ff_sipr_subpk_size [4] = { 29, 19, 37, 20 }
AVInputFormat ff_rm_demuxer
AVInputFormat ff_rdt_demuxer

Define Documentation

#define DEINT_ID_GENR   MKTAG('g', 'e', 'n', 'r')

interleaving for Cooker/Atrac

Definition at line 30 of file rmdec.c.

Referenced by ff_rm_parse_packet(), and rm_read_audio_stream_info().

#define DEINT_ID_INT0   MKTAG('I', 'n', 't', '0')

no interleaving needed

Definition at line 31 of file rmdec.c.

Referenced by rm_read_audio_stream_info().

#define DEINT_ID_INT4   MKTAG('I', 'n', 't', '4')

interleaving for 28.8

Definition at line 32 of file rmdec.c.

Referenced by ff_rm_parse_packet(), and rm_read_audio_stream_info().

#define DEINT_ID_SIPR   MKTAG('s', 'i', 'p', 'r')

interleaving for Sipro

Definition at line 33 of file rmdec.c.

Referenced by ff_rm_parse_packet(), and rm_read_audio_stream_info().

#define DEINT_ID_VBRF   MKTAG('v', 'b', 'r', 'f')

VBR case for AAC.

Definition at line 34 of file rmdec.c.

Referenced by ff_rm_parse_packet(), ff_rm_retrieve_cache(), and rm_read_audio_stream_info().

#define DEINT_ID_VBRS   MKTAG('v', 'b', 'r', 's')

VBR case for AAC.

Definition at line 35 of file rmdec.c.

Referenced by ff_rm_parse_packet(), ff_rm_retrieve_cache(), and rm_read_audio_stream_info().

#define RAW_PACKET_SIZE   1000

Definition at line 584 of file rmdec.c.

Function Documentation

RMStream* ff_rm_alloc_rmstream ( void   ) 

Definition at line 121 of file rmdec.c.

Referenced by rdt_parse_sdp_line(), rm_read_header(), and rm_read_header_old().

void ff_rm_free_rmstream ( RMStream *  rms  ) 

Definition at line 128 of file rmdec.c.

Referenced by rdt_free_context(), and rm_read_close().

int ff_rm_parse_packet ( AVFormatContext *  s,
AVIOContext *  pb,
AVStream *  st,
RMStream *  rst,
int  len,
AVPacket *  pkt,
int *  seq,
int  flags,
int64_t  ts 
)

Parse one rm-stream packet from the input bytestream.

Parameters:
s context containing RMContext and AVIOContext for stream reading
pb context to read the data from
st stream to which the packet to be read belongs
rst Real-specific stream information
len packet length to read from the input
pkt packet location to store the parsed packet data
seq pointer to an integer containing the sequence number, may be updated
flags the packet flags
ts timestamp of the current packet
Returns:
<0 on error, 0 if a packet was placed in the pkt pointer. A value >0 means that no data was placed in pkt, but that cached data is available by calling ff_rm_retrieve_cache().

Definition at line 780 of file rmdec.c.

Referenced by rdt_parse_packet(), and rm_read_packet().

int ff_rm_read_mdpr_codecdata ( AVFormatContext *  s,
AVIOContext *  pb,
AVStream *  st,
RMStream *  rst,
int  codec_data_size,
const uint8_t *  mime 
)

Read the MDPR chunk, which contains stream-specific codec initialization parameters.

Parameters:
s context containing RMContext and AVIOContext for stream reading
pb context to read the data from
st the stream that the MDPR chunk belongs to and where to store the parameters read from the chunk into
rst real-specific stream information
codec_data_size size of the MDPR chunk
Returns:
0 on success, errno codes on error

Definition at line 300 of file rmdec.c.

Referenced by rdt_load_mdpr(), and rm_read_header().

void ff_rm_reorder_sipr_data ( uint8_t *  buf,
int  sub_packet_h,
int  framesize 
)

Perform 4-bit block reordering for SIPR data.

Todo:
This can be optimized, e.g. use memcpy() if data blocks are aligned

Definition at line 757 of file rmdec.c.

Referenced by ff_rm_parse_packet(), and matroska_parse_rm_audio().

int ff_rm_retrieve_cache ( AVFormatContext *  s,
AVIOContext *  pb,
AVStream *  st,
RMStream *  rst,
AVPacket *  pkt 
)

Retrieve one cached packet from the rm-context.

The real container can store several packets (as interpreted by the codec) in a single container packet, which means the demuxer holds some back when the first container packet is parsed and returned. The result is that rm->audio_pkt_cnt is a positive number, the amount of cached packets. Using this function, each of those packets can be retrieved sequentially.

Parameters:
s context containing RMContext and AVIOContext for stream reading
pb context to read the data from
st stream that this packet belongs to
rst Real-specific stream information
pkt location to store the packet data
Returns:
the number of samples left for subsequent calls to this same function, or 0 if all samples have been retrieved.

Definition at line 870 of file rmdec.c.

Referenced by rdt_parse_packet(), and rm_read_packet().

static int get_num ( AVIOContext *  pb,
int *  len 
) [static]

Definition at line 567 of file rmdec.c.

Referenced by rm_assemble_video_frame().

static void get_str8 ( AVIOContext *  pb,
char *  buf,
int  buf_size 
) [static]

Definition at line 91 of file rmdec.c.

Referenced by ff_rm_read_mdpr_codecdata(), rm_read_audio_stream_info(), and rm_read_header().

static void get_strl ( AVIOContext *  pb,
char *  buf,
int  buf_size,
int  len 
) [inline, static]

Definition at line 77 of file rmdec.c.

Referenced by ff_rm_read_mdpr_codecdata(), get_str8(), and rm_read_metadata().

static void rm_ac3_swap_bytes ( AVStream *  st,
AVPacket *  pkt 
) [inline, static]

Definition at line 739 of file rmdec.c.

Referenced by ff_rm_parse_packet().

static int rm_assemble_video_frame ( AVFormatContext *  s,
AVIOContext *  pb,
RMDemuxContext *  rm,
RMStream *  vst,
AVPacket *  pkt,
int  len,
int *  pseq,
int64_t *  timestamp 
) [static]

Definition at line 654 of file rmdec.c.

Referenced by ff_rm_parse_packet().

static int rm_probe ( AVProbeData *  p  )  [static]

Definition at line 959 of file rmdec.c.

static int rm_read_audio_stream_info ( AVFormatContext *  s,
AVIOContext *  pb,
AVStream *  st,
RMStream *  ast,
int  read_all 
) [static]

Definition at line 133 of file rmdec.c.

Referenced by ff_rm_read_mdpr_codecdata(), and rm_read_header_old().

static int rm_read_close ( AVFormatContext *  s  )  [static]

Definition at line 949 of file rmdec.c.

static int64_t rm_read_dts ( AVFormatContext *  s,
int  stream_index,
int64_t *  ppos,
int64_t  pos_limit 
) [static]

Definition at line 972 of file rmdec.c.

static int rm_read_extradata ( AVIOContext *  pb,
AVCodecContext *  avctx,
unsigned  size 
) [static]

Definition at line 96 of file rmdec.c.

Referenced by ff_rm_read_mdpr_codecdata(), and rm_read_audio_stream_info().

static int rm_read_header ( AVFormatContext *  s  )  [static]

Definition at line 461 of file rmdec.c.

static int rm_read_header_old ( AVFormatContext *  s  )  [static]

Definition at line 448 of file rmdec.c.

Referenced by rm_read_header().

static int rm_read_index ( AVFormatContext *  s  )  [static]

this function assumes that the demuxer has already seeked to the start of the INDX chunk, and will bail out if not.

Definition at line 392 of file rmdec.c.

Referenced by rm_read_header().

static void rm_read_metadata ( AVFormatContext *  s,
int  wide 
) [static]

Definition at line 110 of file rmdec.c.

Referenced by rm_read_audio_stream_info(), and rm_read_header().

static int rm_read_packet ( AVFormatContext *  s,
AVPacket *  pkt 
) [static]

Definition at line 897 of file rmdec.c.

static int sync ( AVFormatContext *  s,
int64_t *  timestamp,
int *  flags,
int *  stream_index,
int64_t *  pos 
) [static]

Definition at line 586 of file rmdec.c.

Variable Documentation

AVInputFormat ff_rdt_demuxer

Initial value:

 {
    .name           = "rdt",
    .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),
    .priv_data_size = sizeof(RMDemuxContext),
    .read_close     = rm_read_close,
    .flags          = AVFMT_NOFILE,
}

Definition at line 1028 of file rmdec.c.

Referenced by rdt_new_context().

AVInputFormat ff_rm_demuxer

Initial value:

 {
    .name           = "rm",
    .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),
    .priv_data_size = sizeof(RMDemuxContext),
    .read_probe     = rm_probe,
    .read_header    = rm_read_header,
    .read_packet    = rm_read_packet,
    .read_close     = rm_read_close,
    .read_timestamp = rm_read_dts,
}

Definition at line 1017 of file rmdec.c.

const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 }

Definition at line 75 of file rmdec.c.

Referenced by matroska_read_header(), and rm_read_audio_stream_info().

const unsigned char sipr_swaps[38][2] [static]

Initial value:

 {
    {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
    {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
    { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
    { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
    { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
    { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
    { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
    { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
    { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
    { 67, 83 }, { 77, 80 }
}

Definition at line 62 of file rmdec.c.

Referenced by ff_rm_reorder_sipr_data().

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