FFmpeg
Data Structures | Macros | Functions | Variables
vmdaudio.c File Reference
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "internal.h"

Go to the source code of this file.

Data Structures

struct  VmdAudioContext
 

Macros

#define BLOCK_TYPE_AUDIO   1
 
#define BLOCK_TYPE_INITIAL   2
 
#define BLOCK_TYPE_SILENCE   3
 

Functions

static av_cold int vmdaudio_decode_init (AVCodecContext *avctx)
 
static void decode_audio_s16 (int16_t *out, const uint8_t *buf, int buf_size, int channels)
 
static int vmdaudio_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
 

Variables

static const uint16_t vmdaudio_table [128]
 
const AVCodec ff_vmdaudio_decoder
 

Detailed Description

Sierra VMD audio decoder by Vladimir "VAG" Gneushev (vagsoft at mail.ru) for more information on the Sierra VMD format, visit: http://www.pcisys.net/~melanson/codecs/

The audio decoder, expects each encoded data chunk to be prepended with the appropriate 16-byte frame information record from the VMD file. It does not require the 0x330-byte VMD file header, but it does need the audio setup parameters passed in through normal libavcodec API means.

Definition in file vmdaudio.c.

Macro Definition Documentation

◆ BLOCK_TYPE_AUDIO

#define BLOCK_TYPE_AUDIO   1

Definition at line 46 of file vmdaudio.c.

◆ BLOCK_TYPE_INITIAL

#define BLOCK_TYPE_INITIAL   2

Definition at line 47 of file vmdaudio.c.

◆ BLOCK_TYPE_SILENCE

#define BLOCK_TYPE_SILENCE   3

Definition at line 48 of file vmdaudio.c.

Function Documentation

◆ vmdaudio_decode_init()

static av_cold int vmdaudio_decode_init ( AVCodecContext avctx)
static

Definition at line 71 of file vmdaudio.c.

◆ decode_audio_s16()

static void decode_audio_s16 ( int16_t *  out,
const uint8_t *  buf,
int  buf_size,
int  channels 
)
static

Definition at line 105 of file vmdaudio.c.

Referenced by vmdaudio_decode_frame().

◆ vmdaudio_decode_frame()

static int vmdaudio_decode_frame ( AVCodecContext avctx,
void *  data,
int got_frame_ptr,
AVPacket avpkt 
)
static

Definition at line 134 of file vmdaudio.c.

Variable Documentation

◆ vmdaudio_table

const uint16_t vmdaudio_table[128]
static
Initial value:
= {
0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,
0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,
0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,
0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230,
0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280,
0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0,
0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320,
0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370,
0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0,
0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480,
0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700,
0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00,
0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000
}

Definition at line 55 of file vmdaudio.c.

Referenced by decode_audio_s16().

◆ ff_vmdaudio_decoder

const AVCodec ff_vmdaudio_decoder
Initial value:
= {
.name = "vmdaudio",
.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
.priv_data_size = sizeof(VmdAudioContext),
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
}

Definition at line 231 of file vmdaudio.c.

FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
vmdaudio_decode_init
static av_cold int vmdaudio_decode_init(AVCodecContext *avctx)
Definition: vmdaudio.c:71
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_CODEC_ID_VMDAUDIO
@ AV_CODEC_ID_VMDAUDIO
Definition: codec_id.h:432
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
VmdAudioContext
Definition: vmdaudio.c:50
vmdaudio_decode_frame
static int vmdaudio_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: vmdaudio.c:134