mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
549 lines
15 KiB
C
549 lines
15 KiB
C
/*
|
|
* Sierra VMD Audio & Video Decoders
|
|
* Copyright (C) 2004 the ffmpeg project
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @file vmdvideo.c
|
|
* Sierra VMD audio & video decoders
|
|
* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
|
|
*
|
|
* 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 approriate 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.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "common.h"
|
|
#include "avcodec.h"
|
|
#include "dsputil.h"
|
|
|
|
#define VMD_HEADER_SIZE 0x330
|
|
#define PALETTE_COUNT 256
|
|
|
|
#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
|
|
#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
|
|
(((uint8_t*)(x))[2] << 16) | \
|
|
(((uint8_t*)(x))[1] << 8) | \
|
|
((uint8_t*)(x))[0])
|
|
|
|
/*
|
|
* Video Decoder
|
|
*/
|
|
|
|
typedef struct VmdVideoContext {
|
|
|
|
AVCodecContext *avctx;
|
|
DSPContext dsp;
|
|
AVFrame frame;
|
|
AVFrame prev_frame;
|
|
|
|
unsigned char *buf;
|
|
int size;
|
|
|
|
unsigned char palette[PALETTE_COUNT * 4];
|
|
unsigned char *unpack_buffer;
|
|
|
|
} VmdVideoContext;
|
|
|
|
#define QUEUE_SIZE 0x1000
|
|
#define QUEUE_MASK 0x0FFF
|
|
|
|
static void lz_unpack(unsigned char *src, unsigned char *dest)
|
|
{
|
|
unsigned char *s;
|
|
unsigned char *d;
|
|
unsigned char queue[QUEUE_SIZE];
|
|
unsigned int qpos;
|
|
unsigned int dataleft;
|
|
unsigned int chainofs;
|
|
unsigned int chainlen;
|
|
unsigned int speclen;
|
|
unsigned char tag;
|
|
unsigned int i, j;
|
|
|
|
s = src;
|
|
d = dest;
|
|
dataleft = LE_32(s);
|
|
s += 4;
|
|
memset(queue, QUEUE_SIZE, 0x20);
|
|
if (LE_32(s) == 0x56781234) {
|
|
s += 4;
|
|
qpos = 0x111;
|
|
speclen = 0xF + 3;
|
|
} else {
|
|
qpos = 0xFEE;
|
|
speclen = 100; /* no speclen */
|
|
}
|
|
|
|
while (dataleft > 0) {
|
|
tag = *s++;
|
|
if ((tag == 0xFF) && (dataleft > 8)) {
|
|
for (i = 0; i < 8; i++) {
|
|
queue[qpos++] = *d++ = *s++;
|
|
qpos &= QUEUE_MASK;
|
|
}
|
|
dataleft -= 8;
|
|
} else {
|
|
for (i = 0; i < 8; i++) {
|
|
if (dataleft == 0)
|
|
break;
|
|
if (tag & 0x01) {
|
|
queue[qpos++] = *d++ = *s++;
|
|
qpos &= QUEUE_MASK;
|
|
dataleft--;
|
|
} else {
|
|
chainofs = *s++;
|
|
chainofs |= ((*s & 0xF0) << 4);
|
|
chainlen = (*s++ & 0x0F) + 3;
|
|
if (chainlen == speclen)
|
|
chainlen = *s++ + 0xF + 3;
|
|
for (j = 0; j < chainlen; j++) {
|
|
*d = queue[chainofs++ & QUEUE_MASK];
|
|
queue[qpos++] = *d++;
|
|
qpos &= QUEUE_MASK;
|
|
}
|
|
dataleft -= chainlen;
|
|
}
|
|
tag >>= 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int rle_unpack(unsigned char *src, unsigned char *dest, int len)
|
|
{
|
|
unsigned char *ps;
|
|
unsigned char *pd;
|
|
int i, l;
|
|
|
|
ps = src;
|
|
pd = dest;
|
|
if (len & 1)
|
|
*pd++ = *ps++;
|
|
|
|
len >>= 1;
|
|
i = 0;
|
|
do {
|
|
l = *ps++;
|
|
if (l & 0x80) {
|
|
l = (l & 0x7F) * 2;
|
|
memcpy(pd, ps, l);
|
|
ps += l;
|
|
pd += l;
|
|
} else {
|
|
for (i = 0; i < l; i++) {
|
|
*pd++ = ps[0];
|
|
*pd++ = ps[1];
|
|
}
|
|
ps += 2;
|
|
}
|
|
i += l;
|
|
} while (i < len);
|
|
|
|
return (ps - src);
|
|
}
|
|
|
|
static void vmd_decode(VmdVideoContext *s)
|
|
{
|
|
int i;
|
|
unsigned int *palette32;
|
|
unsigned char r, g, b;
|
|
|
|
/* point to the start of the encoded data */
|
|
unsigned char *p = s->buf + 16;
|
|
|
|
unsigned char *pb;
|
|
unsigned char meth;
|
|
unsigned char *dp; /* pointer to current frame */
|
|
unsigned char *pp; /* pointer to previous frame */
|
|
unsigned char len;
|
|
int ofs;
|
|
|
|
int frame_x, frame_y;
|
|
int frame_width, frame_height;
|
|
|
|
frame_x = LE_16(&s->buf[6]);
|
|
frame_y = LE_16(&s->buf[8]);
|
|
frame_width = LE_16(&s->buf[10]) - frame_x + 1;
|
|
frame_height = LE_16(&s->buf[12]) - frame_y + 1;
|
|
|
|
/* if only a certain region will be updated, copy the entire previous
|
|
* frame before the decode */
|
|
if (frame_x || frame_y || (frame_width != s->avctx->width) ||
|
|
(frame_height != s->avctx->height)) {
|
|
|
|
memcpy(s->frame.data[0], s->prev_frame.data[0],
|
|
s->avctx->height * s->frame.linesize[0]);
|
|
}
|
|
|
|
/* check if there is a new palette */
|
|
if (s->buf[15] & 0x02) {
|
|
p += 2;
|
|
palette32 = (unsigned int *)s->palette;
|
|
for (i = 0; i < PALETTE_COUNT; i++) {
|
|
r = *p++ * 4;
|
|
g = *p++ * 4;
|
|
b = *p++ * 4;
|
|
palette32[i] = (r << 16) | (g << 8) | (b);
|
|
}
|
|
s->size -= (256 * 3 + 2);
|
|
}
|
|
if (s->size >= 0) {
|
|
/* originally UnpackFrame in VAG's code */
|
|
pb = p;
|
|
meth = *pb++;
|
|
if (meth & 0x80) {
|
|
lz_unpack(pb, s->unpack_buffer);
|
|
meth &= 0x7F;
|
|
pb = s->unpack_buffer;
|
|
}
|
|
|
|
dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x];
|
|
pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x];
|
|
switch (meth) {
|
|
case 1:
|
|
for (i = 0; i < frame_height; i++) {
|
|
ofs = 0;
|
|
do {
|
|
len = *pb++;
|
|
if (len & 0x80) {
|
|
len = (len & 0x7F) + 1;
|
|
memcpy(&dp[ofs], pb, len);
|
|
pb += len;
|
|
ofs += len;
|
|
} else {
|
|
/* interframe pixel copy */
|
|
memcpy(&dp[ofs], &pp[ofs], len + 1);
|
|
ofs += len + 1;
|
|
}
|
|
} while (ofs < frame_width);
|
|
if (ofs > frame_width) {
|
|
printf (" VMD video: offset > width (%d > %d)\n",
|
|
ofs, frame_width);
|
|
break;
|
|
}
|
|
dp += s->frame.linesize[0];
|
|
pp += s->prev_frame.linesize[0];
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
for (i = 0; i < frame_height; i++) {
|
|
memcpy(dp, pb, frame_width);
|
|
pb += frame_width;
|
|
dp += s->frame.linesize[0];
|
|
pp += s->prev_frame.linesize[0];
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
for (i = 0; i < frame_height; i++) {
|
|
ofs = 0;
|
|
do {
|
|
len = *pb++;
|
|
if (len & 0x80) {
|
|
len = (len & 0x7F) + 1;
|
|
if (*pb++ == 0xFF)
|
|
len = rle_unpack(pb, dp, len);
|
|
else
|
|
memcpy(&dp[ofs], pb, len);
|
|
pb += len;
|
|
ofs += len;
|
|
} else {
|
|
/* interframe pixel copy */
|
|
memcpy(&dp[ofs], &pp[ofs], len + 1);
|
|
ofs += len + 1;
|
|
}
|
|
} while (ofs < frame_width);
|
|
if (ofs > frame_width) {
|
|
printf (" VMD video: offset > width (%d > %d)\n",
|
|
ofs, frame_width);
|
|
}
|
|
dp += s->frame.linesize[0];
|
|
pp += s->prev_frame.linesize[0];
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int vmdvideo_decode_init(AVCodecContext *avctx)
|
|
{
|
|
VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
|
|
int i;
|
|
unsigned int *palette32;
|
|
int palette_index = 0;
|
|
unsigned char r, g, b;
|
|
unsigned char *vmd_header;
|
|
unsigned char *raw_palette;
|
|
|
|
s->avctx = avctx;
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
avctx->has_b_frames = 0;
|
|
dsputil_init(&s->dsp, avctx);
|
|
|
|
/* make sure the VMD header made it */
|
|
if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
|
|
printf(" VMD video: expected extradata size of %d\n",
|
|
VMD_HEADER_SIZE);
|
|
return -1;
|
|
}
|
|
vmd_header = (unsigned char *)avctx->extradata;
|
|
|
|
s->unpack_buffer = av_malloc(LE_32(&vmd_header[800]));
|
|
if (!s->unpack_buffer)
|
|
return -1;
|
|
|
|
/* load up the initial palette */
|
|
raw_palette = &vmd_header[28];
|
|
palette32 = (unsigned int *)s->palette;
|
|
for (i = 0; i < PALETTE_COUNT; i++) {
|
|
r = raw_palette[palette_index++] * 4;
|
|
g = raw_palette[palette_index++] * 4;
|
|
b = raw_palette[palette_index++] * 4;
|
|
palette32[i] = (r << 16) | (g << 8) | (b);
|
|
}
|
|
|
|
s->frame.data[0] = s->prev_frame.data[0] = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmdvideo_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
|
|
|
|
s->buf = buf;
|
|
s->size = buf_size;
|
|
|
|
s->frame.reference = 1;
|
|
if (avctx->get_buffer(avctx, &s->frame)) {
|
|
printf (" VMD Video: get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
vmd_decode(s);
|
|
|
|
/* make the palette available on the way out */
|
|
memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
|
|
|
|
if (s->prev_frame.data[0])
|
|
avctx->release_buffer(avctx, &s->prev_frame);
|
|
|
|
/* shuffle frames */
|
|
s->prev_frame = s->frame;
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
/* report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
static int vmdvideo_decode_end(AVCodecContext *avctx)
|
|
{
|
|
VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
|
|
|
|
if (s->prev_frame.data[0])
|
|
avctx->release_buffer(avctx, &s->prev_frame);
|
|
av_free(s->unpack_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Audio Decoder
|
|
*/
|
|
|
|
typedef struct VmdAudioContext {
|
|
int channels;
|
|
int bits;
|
|
int block_align;
|
|
unsigned char steps8[16];
|
|
unsigned short steps16[16];
|
|
unsigned short steps128[256];
|
|
short predictors[2];
|
|
} VmdAudioContext;
|
|
|
|
static int vmdaudio_decode_init(AVCodecContext *avctx)
|
|
{
|
|
VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
|
|
int i;
|
|
|
|
s->channels = avctx->channels;
|
|
s->bits = avctx->bits_per_sample;
|
|
s->block_align = avctx->block_align;
|
|
|
|
printf (" %d channels, %d bits/sample, block align = %d\n",
|
|
s->channels, s->bits, s->block_align);
|
|
|
|
/* set up the steps8 and steps16 tables */
|
|
for (i = 0; i < 8; i++) {
|
|
if (i < 4)
|
|
s->steps8[i] = i;
|
|
else
|
|
s->steps8[i] = s->steps8[i - 1] + i - 1;
|
|
|
|
if (i == 0)
|
|
s->steps16[i] = 0;
|
|
else if (i == 1)
|
|
s->steps16[i] = 4;
|
|
else if (i == 2)
|
|
s->steps16[i] = 16;
|
|
else
|
|
s->steps16[i] = 1 << (i + 4);
|
|
}
|
|
|
|
/* set up the step128 table */
|
|
s->steps128[0] = 0;
|
|
s->steps128[1] = 8;
|
|
for (i = 0x02; i <= 0x20; i++)
|
|
s->steps128[i] = (i - 1) << 4;
|
|
for (i = 0x21; i <= 0x60; i++)
|
|
s->steps128[i] = (i + 0x1F) << 3;
|
|
for (i = 0x61; i <= 0x70; i++)
|
|
s->steps128[i] = (i - 0x51) << 6;
|
|
for (i = 0x71; i <= 0x78; i++)
|
|
s->steps128[i] = (i - 0x69) << 8;
|
|
for (i = 0x79; i <= 0x7D; i++)
|
|
s->steps128[i] = (i - 0x75) << 10;
|
|
s->steps128[0x7E] = 0x3000;
|
|
s->steps128[0x7F] = 0x4000;
|
|
|
|
/* set up the negative half of each table */
|
|
for (i = 0; i < 8; i++) {
|
|
s->steps8[i + 8] = -s->steps8[i];
|
|
s->steps16[i + 8] = -s->steps16[i];
|
|
}
|
|
for (i = 0; i < 128; i++)
|
|
s->steps128[i + 128] = -s->steps128[i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data,
|
|
uint8_t *buf, int ratio) {
|
|
|
|
}
|
|
|
|
static void vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
|
|
uint8_t *buf, int silence)
|
|
{
|
|
if (s->channels == 2) {
|
|
if ((s->block_align & 0x01) == 0) {
|
|
if (silence)
|
|
memset(data, 0, s->block_align * 2);
|
|
else
|
|
vmdaudio_decode_audio(s, data, buf, 1);
|
|
} else {
|
|
if (silence)
|
|
memset(data, 0, s->block_align * 2);
|
|
// else
|
|
// vmdaudio_decode_audio(s, data, buf, 1);
|
|
}
|
|
} else {
|
|
}
|
|
}
|
|
|
|
static int vmdaudio_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
|
|
unsigned int sound_flags;
|
|
unsigned char *output_samples = (unsigned char *)data;
|
|
|
|
/* point to the start of the encoded data */
|
|
unsigned char *p = buf + 16;
|
|
unsigned char *p_end = buf + buf_size;
|
|
|
|
if (buf[6] == 1) {
|
|
/* the chunk contains audio */
|
|
vmdaudio_loadsound(s, output_samples, p, 0);
|
|
} else if (buf[6] == 2) {
|
|
/* the chunk contains audio and silence mixed together */
|
|
sound_flags = LE_32(p);
|
|
p += 4;
|
|
|
|
/* do something with extrabufs here? */
|
|
|
|
while (p < p_end) {
|
|
if (sound_flags & 0x01)
|
|
/* audio */
|
|
vmdaudio_loadsound(s, output_samples, p, 1);
|
|
else
|
|
/* silence */
|
|
vmdaudio_loadsound(s, output_samples, p, 0);
|
|
p += s->block_align;
|
|
output_samples += (s->block_align * s->bits / 8);
|
|
sound_flags >>= 1;
|
|
}
|
|
} else if (buf[6] == 3) {
|
|
/* silent chunk */
|
|
vmdaudio_loadsound(s, output_samples, p, 1);
|
|
}
|
|
|
|
|
|
// *datasize = ;
|
|
return buf_size;
|
|
}
|
|
|
|
|
|
/*
|
|
* Public Data Structures
|
|
*/
|
|
|
|
AVCodec vmdvideo_decoder = {
|
|
"vmdvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_VMDVIDEO,
|
|
sizeof(VmdVideoContext),
|
|
vmdvideo_decode_init,
|
|
NULL,
|
|
vmdvideo_decode_end,
|
|
vmdvideo_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec vmdaudio_decoder = {
|
|
"vmdaudio",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_VMDAUDIO,
|
|
sizeof(VmdAudioContext),
|
|
vmdaudio_decode_init,
|
|
NULL,
|
|
NULL,
|
|
vmdaudio_decode_frame,
|
|
};
|