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

Macros

#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, AVIOContext *pb, int wide)
RMStreamff_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)
 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, AVFormatParameters *ap)
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

Macro Definition 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 548 of file rmdec.c.

Referenced by rm_read_packet().

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
scontext containing RMContext and AVIOContext for stream reading
pbcontext to read the data from
ststream to which the packet to be read belongs
rstReal-specific stream information
lenpacket length to read from the input
pktpacket location to store the parsed packet data
seqpointer to an integer containing the sequence number, may be updated
flagsthe packet flags
tstimestamp 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 744 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 
)

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

Parameters
scontext containing RMContext and AVIOContext for stream reading
pbcontext to read the data from
stthe stream that the MDPR chunk belongs to and where to store the parameters read from the chunk into
rstreal-specific stream information
codec_data_sizesize of the MDPR chunk
Returns
0 on success, errno codes on error

Definition at line 298 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 721 of file rmdec.c.

Referenced by ff_rm_parse_packet(), and matroska_parse_block().

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
scontext containing RMContext and AVIOContext for stream reading
pbcontext to read the data from
ststream that this packet belongs to
rstReal-specific stream information
pktlocation 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 834 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 531 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 rm_read_audio_stream_info(), and rm_read_header().

static void get_strl ( AVIOContext pb,
char *  buf,
int  buf_size,
int  len 
)
inlinestatic

Definition at line 77 of file rmdec.c.

Referenced by get_str8(), and rm_read_metadata().

static void rm_ac3_swap_bytes ( AVStream st,
AVPacket pkt 
)
inlinestatic

Definition at line 703 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 618 of file rmdec.c.

Referenced by ff_rm_parse_packet().

static int rm_probe ( AVProbeData p)
static

Definition at line 923 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 913 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 936 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,
AVFormatParameters ap 
)
static

Definition at line 426 of file rmdec.c.

static int rm_read_header_old ( AVFormatContext s)
static

Definition at line 413 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 357 of file rmdec.c.

Referenced by rm_read_header().

static void rm_read_metadata ( AVFormatContext s,
AVIOContext pb,
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 861 of file rmdec.c.

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

Definition at line 550 of file rmdec.c.

Referenced by rm_read_dts(), and rm_read_packet().

Variable Documentation

AVInputFormat ff_rdt_demuxer
Initial value:
{
.name = "rdt",
.long_name = NULL_IF_CONFIG_SMALL("RDT demuxer"),
.priv_data_size = sizeof(RMDemuxContext),
}

Definition at line 990 of file rmdec.c.

Referenced by rdt_new_context().

AVInputFormat ff_rm_demuxer
Initial value:
{
.name = "rm",
.long_name = NULL_IF_CONFIG_SMALL("RealMedia format"),
.priv_data_size = sizeof(RMDemuxContext),
.read_timestamp = rm_read_dts,
}

Definition at line 979 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().