* Sierra VMD Audio & Video Decoders
* Copyright (C) 2004 the ffmpeg project
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg 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
- *
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file vmdvideo.c
* 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
+ * 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
+ * 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.
#include <string.h>
#include <unistd.h>
-#include "common.h"
#include "avcodec.h"
-#include "dsputil.h"
-
-#define printf(...) {} //(f)printf() usage is forbidden in libavcodec, use av_log
-#define fprintf(...) {}
#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;
+ const unsigned char *buf;
int size;
unsigned char palette[PALETTE_COUNT * 4];
unsigned char *unpack_buffer;
+ int unpack_buffer_size;
+ int x_off, y_off;
} VmdVideoContext;
#define QUEUE_SIZE 0x1000
#define QUEUE_MASK 0x0FFF
-static void lz_unpack(unsigned char *src, unsigned char *dest)
+static void lz_unpack(const unsigned char *src, unsigned char *dest, int dest_len)
{
- unsigned char *s;
+ const unsigned char *s;
unsigned char *d;
+ unsigned char *d_end;
unsigned char queue[QUEUE_SIZE];
unsigned int qpos;
unsigned int dataleft;
s = src;
d = dest;
- dataleft = LE_32(s);
+ d_end = d + dest_len;
+ dataleft = AV_RL32(s);
s += 4;
- memset(queue, QUEUE_SIZE, 0x20);
- if (LE_32(s) == 0x56781234) {
+ memset(queue, 0x20, QUEUE_SIZE);
+ if (AV_RL32(s) == 0x56781234) {
s += 4;
qpos = 0x111;
speclen = 0xF + 3;
while (dataleft > 0) {
tag = *s++;
if ((tag == 0xFF) && (dataleft > 8)) {
+ if (d + 8 > d_end)
+ return;
for (i = 0; i < 8; i++) {
queue[qpos++] = *d++ = *s++;
qpos &= QUEUE_MASK;
if (dataleft == 0)
break;
if (tag & 0x01) {
+ if (d + 1 > d_end)
+ return;
queue[qpos++] = *d++ = *s++;
qpos &= QUEUE_MASK;
dataleft--;
chainlen = (*s++ & 0x0F) + 3;
if (chainlen == speclen)
chainlen = *s++ + 0xF + 3;
+ if (d + chainlen > d_end)
+ return;
for (j = 0; j < chainlen; j++) {
*d = queue[chainofs++ & QUEUE_MASK];
queue[qpos++] = *d++;
}
}
-static int rle_unpack(unsigned char *src, unsigned char *dest, int len)
+static int rle_unpack(const unsigned char *src, unsigned char *dest,
+ int src_len, int dest_len)
{
- unsigned char *ps;
+ const unsigned char *ps;
unsigned char *pd;
int i, l;
+ unsigned char *dest_end = dest + dest_len;
ps = src;
pd = dest;
- if (len & 1)
+ if (src_len & 1)
*pd++ = *ps++;
- len >>= 1;
+ src_len >>= 1;
i = 0;
do {
l = *ps++;
if (l & 0x80) {
l = (l & 0x7F) * 2;
+ if (pd + l > dest_end)
+ return (ps - src);
memcpy(pd, ps, l);
ps += l;
pd += l;
} else {
+ if (pd + i > dest_end)
+ return (ps - src);
for (i = 0; i < l; i++) {
*pd++ = ps[0];
*pd++ = ps[1];
ps += 2;
}
i += l;
- } while (i < len);
+ } while (i < src_len);
return (ps - src);
}
unsigned char r, g, b;
/* point to the start of the encoded data */
- unsigned char *p = s->buf + 16;
+ const unsigned char *p = s->buf + 16;
- unsigned char *pb;
+ const unsigned char *pb;
unsigned char meth;
unsigned char *dp; /* pointer to current frame */
unsigned char *pp; /* pointer to previous frame */
int frame_x, frame_y;
int frame_width, frame_height;
+ int dp_size;
+
+ frame_x = AV_RL16(&s->buf[6]);
+ frame_y = AV_RL16(&s->buf[8]);
+ frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
+ frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
- 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 ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
+ (frame_x || frame_y)) {
+
+ s->x_off = frame_x;
+ s->y_off = frame_y;
+ }
+ frame_x -= s->x_off;
+ frame_y -= s->y_off;
/* 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],
+ memcpy(s->frame.data[0], s->prev_frame.data[0],
s->avctx->height * s->frame.linesize[0]);
}
pb = p;
meth = *pb++;
if (meth & 0x80) {
- lz_unpack(pb, s->unpack_buffer);
+ lz_unpack(pb, s->unpack_buffer, s->unpack_buffer_size);
meth &= 0x7F;
pb = s->unpack_buffer;
}
dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x];
+ dp_size = s->frame.linesize[0] * s->avctx->height;
pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x];
switch (meth) {
case 1:
len = *pb++;
if (len & 0x80) {
len = (len & 0x7F) + 1;
+ if (ofs + len > frame_width)
+ return;
memcpy(&dp[ofs], pb, len);
pb += len;
ofs += len;
} else {
/* interframe pixel copy */
+ if (ofs + len + 1 > frame_width)
+ return;
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",
+ av_log(s->avctx, AV_LOG_ERROR, "VMD video: offset > width (%d > %d)\n",
ofs, frame_width);
break;
}
if (len & 0x80) {
len = (len & 0x7F) + 1;
if (*pb++ == 0xFF)
- len = rle_unpack(pb, dp, len);
+ len = rle_unpack(pb, &dp[ofs], len, frame_width - ofs);
else
memcpy(&dp[ofs], pb, len);
pb += len;
ofs += len;
} else {
/* interframe pixel copy */
+ if (ofs + len + 1 > frame_width)
+ return;
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",
+ av_log(s->avctx, AV_LOG_ERROR, "VMD video: offset > width (%d > %d)\n",
ofs, frame_width);
}
dp += s->frame.linesize[0];
}
}
-static int vmdvideo_decode_init(AVCodecContext *avctx)
+static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
{
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
+ VmdVideoContext *s = avctx->priv_data;
int i;
unsigned int *palette32;
int palette_index = 0;
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",
+ av_log(s->avctx, AV_LOG_ERROR, "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]));
+ s->unpack_buffer_size = AV_RL32(&vmd_header[800]);
+ s->unpack_buffer = av_malloc(s->unpack_buffer_size);
if (!s->unpack_buffer)
return -1;
static int vmdvideo_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ const uint8_t *buf, int buf_size)
{
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
+ VmdVideoContext *s = avctx->priv_data;
s->buf = buf;
s->size = buf_size;
+ if (buf_size < 16)
+ return buf_size;
+
s->frame.reference = 1;
if (avctx->get_buffer(avctx, &s->frame)) {
- printf (" VMD Video: get_buffer() failed\n");
+ av_log(s->avctx, AV_LOG_ERROR, "VMD Video: get_buffer() failed\n");
return -1;
}
/* 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;
+ FFSWAP(AVFrame, s->frame, s->prev_frame);
+ if (s->frame.data[0])
+ avctx->release_buffer(avctx, &s->frame);
*data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->frame;
+ *(AVFrame*)data = s->prev_frame;
/* report that the buffer was completely consumed */
return buf_size;
}
-static int vmdvideo_decode_end(AVCodecContext *avctx)
+static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)
{
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
+ VmdVideoContext *s = avctx->priv_data;
if (s->prev_frame.data[0])
avctx->release_buffer(avctx, &s->prev_frame);
*/
typedef struct VmdAudioContext {
+ AVCodecContext *avctx;
int channels;
int bits;
int block_align;
- unsigned char steps8[16];
- unsigned short steps16[16];
- unsigned short steps128[256];
- short predictors[2];
+ int predictors[2];
} VmdAudioContext;
-static int vmdaudio_decode_init(AVCodecContext *avctx)
+static uint16_t vmdaudio_table[128] = {
+ 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
+};
+
+static av_cold int vmdaudio_decode_init(AVCodecContext *avctx)
{
- VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
- int i;
+ VmdAudioContext *s = avctx->priv_data;
+ s->avctx = avctx;
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];
+ av_log(s->avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, block align = %d, sample rate = %d\n",
+ s->channels, s->bits, s->block_align, avctx->sample_rate);
return 0;
}
static void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data,
- uint8_t *buf, int ratio) {
+ const uint8_t *buf, int stereo)
+{
+ int i;
+ int chan = 0;
+ int16_t *out = (int16_t*)data;
+ for(i = 0; i < s->block_align; i++) {
+ if(buf[i] & 0x80)
+ s->predictors[chan] -= vmdaudio_table[buf[i] & 0x7F];
+ else
+ s->predictors[chan] += vmdaudio_table[buf[i]];
+ s->predictors[chan] = av_clip_int16(s->predictors[chan]);
+ out[i] = s->predictors[chan];
+ chan ^= stereo;
+ }
}
-static void vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
- uint8_t *buf, int silence)
+static int vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
+ const uint8_t *buf, int silence)
{
+ int bytes_decoded = 0;
+ int i;
+
+// if (silence)
+// av_log(s->avctx, AV_LOG_INFO, "silent block!\n");
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);
+
+ /* stereo handling */
+ if (silence) {
+ memset(data, 0, s->block_align * 2);
} else {
- if (silence)
- memset(data, 0, s->block_align * 2);
-// else
-// vmdaudio_decode_audio(s, data, buf, 1);
+ if (s->bits == 16)
+ vmdaudio_decode_audio(s, data, buf, 1);
+ else {
+ /* copy the data but convert it to signed */
+ for (i = 0; i < s->block_align; i++){
+ *data++ = buf[i] + 0x80;
+ *data++ = buf[i] + 0x80;
+ }
+ }
}
} else {
+ bytes_decoded = s->block_align * 2;
+
+ /* mono handling */
+ if (silence) {
+ memset(data, 0, s->block_align * 2);
+ } else {
+ if (s->bits == 16) {
+ vmdaudio_decode_audio(s, data, buf, 0);
+ } else {
+ /* copy the data but convert it to signed */
+ for (i = 0; i < s->block_align; i++){
+ *data++ = buf[i] + 0x80;
+ *data++ = buf[i] + 0x80;
+ }
+ }
+ }
}
+
+ return s->block_align * 2;
}
static int vmdaudio_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ const uint8_t *buf, int buf_size)
{
- VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
- unsigned int sound_flags;
+ VmdAudioContext *s = avctx->priv_data;
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;
+ const unsigned char *p = buf + 16;
+
+ if (buf_size < 16)
+ return buf_size;
if (buf[6] == 1) {
/* the chunk contains audio */
- vmdaudio_loadsound(s, output_samples, p, 0);
+ *data_size = 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);
+ /* the chunk may contain audio */
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;
- }
+ *data_size = vmdaudio_loadsound(s, output_samples, p, (buf_size == 16));
+ output_samples += (s->block_align * s->bits / 8);
} else if (buf[6] == 3) {
/* silent chunk */
- vmdaudio_loadsound(s, output_samples, p, 1);
+ *data_size = vmdaudio_loadsound(s, output_samples, p, 1);
}
-
-// *datasize = ;
return buf_size;
}
projects / ffmpeg / blobdiff