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FFmpeg/libavcodec/vmdvideo.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* Sierra VMD video decoder
* Copyright (c) 2004 The FFmpeg Project
*
* 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 2.1 of the License, or (at your option) any later version.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Sierra VMD video 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 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.
*/
#include <string.h>
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "internal.h"
#include "bytestream.h"
#define VMD_HEADER_SIZE 0x330
#define PALETTE_COUNT 256
typedef struct VmdVideoContext {
AVCodecContext *avctx;
AVFrame *prev_frame;
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 int lz_unpack(const unsigned char *src, int src_len,
unsigned char *dest, int dest_len)
{
unsigned char *d;
unsigned char *d_end;
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;
GetByteContext gb;
bytestream2_init(&gb, src, src_len);
d = dest;
d_end = d + dest_len;
dataleft = bytestream2_get_le32(&gb);
memset(queue, 0x20, QUEUE_SIZE);
if (bytestream2_get_bytes_left(&gb) < 4)
return AVERROR_INVALIDDATA;
if (bytestream2_peek_le32(&gb) == 0x56781234) {
bytestream2_skipu(&gb, 4);
qpos = 0x111;
speclen = 0xF + 3;
} else {
qpos = 0xFEE;
speclen = 100; /* no speclen */
}
while (dataleft > 0 && bytestream2_get_bytes_left(&gb) > 0) {
tag = bytestream2_get_byteu(&gb);
if ((tag == 0xFF) && (dataleft > 8)) {
if (d_end - d < 8 || bytestream2_get_bytes_left(&gb) < 8)
return AVERROR_INVALIDDATA;
for (i = 0; i < 8; i++) {
queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);
qpos &= QUEUE_MASK;
}
dataleft -= 8;
} else {
for (i = 0; i < 8; i++) {
if (dataleft == 0)
break;
if (tag & 0x01) {
if (d_end - d < 1 || bytestream2_get_bytes_left(&gb) < 1)
return AVERROR_INVALIDDATA;
queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);
qpos &= QUEUE_MASK;
dataleft--;
} else {
chainofs = bytestream2_get_byte(&gb);
chainofs |= ((bytestream2_peek_byte(&gb) & 0xF0) << 4);
chainlen = (bytestream2_get_byte(&gb) & 0x0F) + 3;
if (chainlen == speclen) {
chainlen = bytestream2_get_byte(&gb) + 0xF + 3;
}
if (d_end - d < chainlen)
return AVERROR_INVALIDDATA;
for (j = 0; j < chainlen; j++) {
*d = queue[chainofs++ & QUEUE_MASK];
queue[qpos++] = *d++;
qpos &= QUEUE_MASK;
}
dataleft -= chainlen;
}
tag >>= 1;
}
}
}
return d - dest;
}
static int rle_unpack(const unsigned char *src, unsigned char *dest,
int src_count, int src_size, int dest_len)
{
unsigned char *pd;
int i, l, used = 0;
unsigned char *dest_end = dest + dest_len;
GetByteContext gb;
uint16_t run_val;
bytestream2_init(&gb, src, src_size);
pd = dest;
if (src_count & 1) {
if (bytestream2_get_bytes_left(&gb) < 1)
return 0;
*pd++ = bytestream2_get_byteu(&gb);
used++;
}
do {
if (bytestream2_get_bytes_left(&gb) < 1)
break;
l = bytestream2_get_byteu(&gb);
if (l & 0x80) {
l = (l & 0x7F) * 2;
if (dest_end - pd < l || bytestream2_get_bytes_left(&gb) < l)
return bytestream2_tell(&gb);
bytestream2_get_bufferu(&gb, pd, l);
pd += l;
} else {
if (dest_end - pd < 2*l || bytestream2_get_bytes_left(&gb) < 2)
return bytestream2_tell(&gb);
run_val = bytestream2_get_ne16(&gb);
for (i = 0; i < l; i++) {
AV_WN16(pd, run_val);
pd += 2;
}
l *= 2;
}
used += l;
} while (used < src_count);
return bytestream2_tell(&gb);
}
static int vmd_decode(VmdVideoContext *s, AVFrame *frame)
{
int i;
unsigned int *palette32;
unsigned char r, g, b;
GetByteContext gb;
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, prev_linesize;
int frame_width, frame_height;
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;
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 (frame_x < 0 || frame_width < 0 ||
frame_x >= s->avctx->width ||
frame_width > s->avctx->width ||
frame_x + frame_width > s->avctx->width) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid horizontal range %d-%d\n",
frame_x, frame_width);
return AVERROR_INVALIDDATA;
}
if (frame_y < 0 || frame_height < 0 ||
frame_y >= s->avctx->height ||
frame_height > s->avctx->height ||
frame_y + frame_height > s->avctx->height) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid vertical range %d-%d\n",
frame_y, frame_height);
return AVERROR_INVALIDDATA;
}
/* if only a certain region will be updated, copy the entire previous
* frame before the decode */
if (s->prev_frame->data[0] &&
(frame_x || frame_y || (frame_width != s->avctx->width) ||
(frame_height != s->avctx->height))) {
memcpy(frame->data[0], s->prev_frame->data[0],
s->avctx->height * frame->linesize[0]);
}
/* check if there is a new palette */
bytestream2_init(&gb, s->buf + 16, s->size - 16);
if (s->buf[15] & 0x02) {
bytestream2_skip(&gb, 2);
palette32 = (unsigned int *)s->palette;
if (bytestream2_get_bytes_left(&gb) >= PALETTE_COUNT * 3) {
for (i = 0; i < PALETTE_COUNT; i++) {
r = bytestream2_get_byteu(&gb) * 4;
g = bytestream2_get_byteu(&gb) * 4;
b = bytestream2_get_byteu(&gb) * 4;
palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);
palette32[i] |= palette32[i] >> 6 & 0x30303;
}
} else {
av_log(s->avctx, AV_LOG_ERROR, "Incomplete palette\n");
return AVERROR_INVALIDDATA;
}
}
if (!s->size)
return 0;
/* originally UnpackFrame in VAG's code */
if (bytestream2_get_bytes_left(&gb) < 1)
return AVERROR_INVALIDDATA;
meth = bytestream2_get_byteu(&gb);
if (meth & 0x80) {
int size;
if (!s->unpack_buffer_size) {
av_log(s->avctx, AV_LOG_ERROR,
"Trying to unpack LZ-compressed frame with no LZ buffer\n");
return AVERROR_INVALIDDATA;
}
size = lz_unpack(gb.buffer, bytestream2_get_bytes_left(&gb),
s->unpack_buffer, s->unpack_buffer_size);
if (size < 0)
return size;
meth &= 0x7F;
bytestream2_init(&gb, s->unpack_buffer, size);
}
dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x];
if (s->prev_frame->data[0]) {
prev_linesize = s->prev_frame->linesize[0];
pp = s->prev_frame->data[0] + frame_y * prev_linesize + frame_x;
} else {
pp = NULL;
prev_linesize = 0;
}
switch (meth) {
case 1:
for (i = 0; i < frame_height; i++) {
ofs = 0;
do {
len = bytestream2_get_byte(&gb);
if (len & 0x80) {
len = (len & 0x7F) + 1;
if (ofs + len > frame_width ||
bytestream2_get_bytes_left(&gb) < len)
return AVERROR_INVALIDDATA;
bytestream2_get_bufferu(&gb, &dp[ofs], len);
ofs += len;
} else {
/* interframe pixel copy */
if (ofs + len + 1 > frame_width || !pp)
return AVERROR_INVALIDDATA;
memcpy(&dp[ofs], &pp[ofs], len + 1);
ofs += len + 1;
}
} while (ofs < frame_width);
if (ofs > frame_width) {
av_log(s->avctx, AV_LOG_ERROR,
"offset > width (%d > %d)\n",
ofs, frame_width);
return AVERROR_INVALIDDATA;
}
dp += frame->linesize[0];
pp = FF_PTR_ADD(pp, prev_linesize);
}
break;
case 2:
for (i = 0; i < frame_height; i++) {
bytestream2_get_buffer(&gb, dp, frame_width);
dp += frame->linesize[0];
}
break;
case 3:
for (i = 0; i < frame_height; i++) {
ofs = 0;
do {
len = bytestream2_get_byte(&gb);
if (len & 0x80) {
len = (len & 0x7F) + 1;
if (bytestream2_peek_byte(&gb) == 0xFF) {
int slen = len;
bytestream2_get_byte(&gb);
len = rle_unpack(gb.buffer, &dp[ofs],
len, bytestream2_get_bytes_left(&gb),
frame_width - ofs);
ofs += slen;
bytestream2_skip(&gb, len);
} else {
if (ofs + len > frame_width ||
bytestream2_get_bytes_left(&gb) < len)
return AVERROR_INVALIDDATA;
bytestream2_get_buffer(&gb, &dp[ofs], len);
ofs += len;
}
} else {
/* interframe pixel copy */
if (ofs + len + 1 > frame_width || !pp)
return AVERROR_INVALIDDATA;
memcpy(&dp[ofs], &pp[ofs], len + 1);
ofs += len + 1;
}
} while (ofs < frame_width);
if (ofs > frame_width) {
av_log(s->avctx, AV_LOG_ERROR,
"offset > width (%d > %d)\n",
ofs, frame_width);
return AVERROR_INVALIDDATA;
}
dp += frame->linesize[0];
pp = FF_PTR_ADD(pp, prev_linesize);
}
break;
}
return 0;
}
static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)
{
VmdVideoContext *s = avctx->priv_data;
av_frame_free(&s->prev_frame);
av_freep(&s->unpack_buffer);
s->unpack_buffer_size = 0;
return 0;
}
static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
{
VmdVideoContext *s = 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 = AV_PIX_FMT_PAL8;
/* make sure the VMD header made it */
if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n",
VMD_HEADER_SIZE);
return AVERROR_INVALIDDATA;
}
vmd_header = (unsigned char *)avctx->extradata;
s->unpack_buffer_size = AV_RL32(&vmd_header[800]);
if (s->unpack_buffer_size) {
s->unpack_buffer = av_malloc(s->unpack_buffer_size);
if (!s->unpack_buffer)
return AVERROR(ENOMEM);
}
/* 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] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);
palette32[i] |= palette32[i] >> 6 & 0x30303;
}
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)
return AVERROR(ENOMEM);
return 0;
}
static int vmdvideo_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
VmdVideoContext *s = avctx->priv_data;
AVFrame *frame = data;
int ret;
s->buf = buf;
s->size = buf_size;
if (buf_size < 16)
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
if ((ret = vmd_decode(s, frame)) < 0)
return ret;
/* make the palette available on the way out */
memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
/* shuffle frames */
av_frame_unref(s->prev_frame);
if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
return ret;
*got_frame = 1;
/* report that the buffer was completely consumed */
return buf_size;
}
const FFCodec ff_vmdvideo_decoder = {
.p.name = "vmdvideo",
.p.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_VMDVIDEO,
.priv_data_size = sizeof(VmdVideoContext),
.init = vmdvideo_decode_init,
.close = vmdvideo_decode_end,
.decode = vmdvideo_decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
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