libavcodec/vmdav.c File Reference

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

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"

Go to the source code of this file.

Data Structures

struct  VmdVideoContext
struct  VmdAudioContext

Defines

#define VMD_HEADER_SIZE   0x330
#define PALETTE_COUNT   256
#define QUEUE_SIZE   0x1000
#define QUEUE_MASK   0x0FFF
#define BLOCK_TYPE_AUDIO   1
#define BLOCK_TYPE_INITIAL   2
#define BLOCK_TYPE_SILENCE   3

Functions

static void lz_unpack (const unsigned char *src, int src_len, unsigned char *dest, int dest_len)
static int rle_unpack (const unsigned char *src, int src_len, int src_count, unsigned char *dest, int dest_len)
static void vmd_decode (VmdVideoContext *s)
static av_cold int vmdvideo_decode_init (AVCodecContext *avctx)
static int vmdvideo_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
static av_cold int vmdvideo_decode_end (AVCodecContext *avctx)
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]
AVCodec ff_vmdvideo_decoder
AVCodec ff_vmdaudio_decoder


Detailed Description

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

The video decoder outputs PAL8 colorspace data. The decoder expects a 0x330-byte VMD file header to be transmitted via extradata during codec initialization. Each encoded frame that is sent to this decoder is expected to be prepended with the appropriate 16-byte frame information record from the VMD file.

The audio decoder, like the video 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 vmdav.c.


Define Documentation

#define BLOCK_TYPE_AUDIO   1

Definition at line 465 of file vmdav.c.

#define BLOCK_TYPE_INITIAL   2

Definition at line 466 of file vmdav.c.

Referenced by vmdaudio_decode_frame().

#define BLOCK_TYPE_SILENCE   3

Definition at line 467 of file vmdav.c.

Referenced by vmdaudio_decode_frame().

#define PALETTE_COUNT   256

Definition at line 51 of file vmdav.c.

#define QUEUE_MASK   0x0FFF

Definition at line 74 of file vmdav.c.

Referenced by lz_unpack().

#define QUEUE_SIZE   0x1000

Definition at line 73 of file vmdav.c.

Referenced by filter_samples(), lz_unpack(), send_next(), and send_out().

#define VMD_HEADER_SIZE   0x330

Definition at line 50 of file vmdav.c.

Referenced by vmd_probe(), vmd_read_header(), and vmdvideo_decode_init().


Function Documentation

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

Definition at line 523 of file vmdav.c.

Referenced by vmdaudio_decode_frame().

static void lz_unpack ( const unsigned char *  src,
int  src_len,
unsigned char *  dest,
int  dest_len 
) [static]

Definition at line 76 of file vmdav.c.

Referenced by vmd_decode().

static int rle_unpack ( const unsigned char *  src,
int  src_len,
int  src_count,
unsigned char *  dest,
int  dest_len 
) [static]

Definition at line 157 of file vmdav.c.

Referenced by vmd_decode().

static void vmd_decode ( VmdVideoContext s  )  [static]

Definition at line 203 of file vmdav.c.

Referenced by vmdvideo_decode_frame().

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

Definition at line 552 of file vmdav.c.

static av_cold int vmdaudio_decode_init ( AVCodecContext avctx  )  [static]

Definition at line 491 of file vmdav.c.

static av_cold int vmdvideo_decode_end ( AVCodecContext avctx  )  [static]

Definition at line 449 of file vmdav.c.

static int vmdvideo_decode_frame ( AVCodecContext avctx,
void *  data,
int data_size,
AVPacket avpkt 
) [static]

Definition at line 412 of file vmdav.c.

static av_cold int vmdvideo_decode_init ( AVCodecContext avctx  )  [static]

Definition at line 370 of file vmdav.c.


Variable Documentation

Initial value:

 {
    .name           = "vmdaudio",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_VMDAUDIO,
    .priv_data_size = sizeof(VmdAudioContext),
    .init           = vmdaudio_decode_init,
    .decode         = vmdaudio_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
}

Definition at line 658 of file vmdav.c.

Initial value:

 {
    .name           = "vmdvideo",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_VMDVIDEO,
    .priv_data_size = sizeof(VmdVideoContext),
    .init           = vmdvideo_decode_init,
    .close          = vmdvideo_decode_end,
    .decode         = vmdvideo_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
}

Definition at line 646 of file vmdav.c.

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 475 of file vmdav.c.

Referenced by decode_audio_s16().


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