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476 lines
15 KiB
C
Executable File
476 lines
15 KiB
C
Executable File
/*
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* Sierra VMD video decoder
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* Copyright (c) 2004 The FFmpeg Project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Sierra VMD video decoder
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* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
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* for more information on the Sierra VMD format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* The video decoder outputs PAL8 colorspace data. The decoder expects
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* a 0x330-byte VMD file header to be transmitted via extradata during
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* codec initialization. Each encoded frame that is sent to this decoder
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* is expected to be prepended with the appropriate 16-byte frame
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* information record from the VMD file.
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*/
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#include <string.h>
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "bytestream.h"
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#define VMD_HEADER_SIZE 0x330
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#define PALETTE_COUNT 256
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typedef struct VmdVideoContext {
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AVCodecContext *avctx;
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AVFrame *prev_frame;
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const unsigned char *buf;
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int size;
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unsigned char palette[PALETTE_COUNT * 4];
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unsigned char *unpack_buffer;
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int unpack_buffer_size;
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int x_off, y_off;
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} VmdVideoContext;
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#define QUEUE_SIZE 0x1000
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#define QUEUE_MASK 0x0FFF
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static int lz_unpack(const unsigned char *src, int src_len,
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unsigned char *dest, int dest_len)
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{
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unsigned char *d;
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unsigned char *d_end;
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unsigned char queue[QUEUE_SIZE];
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unsigned int qpos;
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unsigned int dataleft;
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unsigned int chainofs;
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unsigned int chainlen;
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unsigned int speclen;
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unsigned char tag;
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unsigned int i, j;
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GetByteContext gb;
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bytestream2_init(&gb, src, src_len);
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d = dest;
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d_end = d + dest_len;
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dataleft = bytestream2_get_le32(&gb);
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memset(queue, 0x20, QUEUE_SIZE);
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if (bytestream2_get_bytes_left(&gb) < 4)
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return AVERROR_INVALIDDATA;
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if (bytestream2_peek_le32(&gb) == 0x56781234) {
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bytestream2_skipu(&gb, 4);
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qpos = 0x111;
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speclen = 0xF + 3;
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} else {
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qpos = 0xFEE;
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speclen = 100; /* no speclen */
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}
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while (dataleft > 0 && bytestream2_get_bytes_left(&gb) > 0) {
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tag = bytestream2_get_byteu(&gb);
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if ((tag == 0xFF) && (dataleft > 8)) {
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if (d_end - d < 8 || bytestream2_get_bytes_left(&gb) < 8)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < 8; i++) {
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queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);
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qpos &= QUEUE_MASK;
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}
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dataleft -= 8;
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} else {
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for (i = 0; i < 8; i++) {
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if (dataleft == 0)
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break;
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if (tag & 0x01) {
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if (d_end - d < 1 || bytestream2_get_bytes_left(&gb) < 1)
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return AVERROR_INVALIDDATA;
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queue[qpos++] = *d++ = bytestream2_get_byteu(&gb);
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qpos &= QUEUE_MASK;
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dataleft--;
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} else {
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chainofs = bytestream2_get_byte(&gb);
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chainofs |= ((bytestream2_peek_byte(&gb) & 0xF0) << 4);
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chainlen = (bytestream2_get_byte(&gb) & 0x0F) + 3;
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if (chainlen == speclen) {
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chainlen = bytestream2_get_byte(&gb) + 0xF + 3;
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}
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if (d_end - d < chainlen)
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return AVERROR_INVALIDDATA;
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for (j = 0; j < chainlen; j++) {
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*d = queue[chainofs++ & QUEUE_MASK];
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queue[qpos++] = *d++;
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qpos &= QUEUE_MASK;
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}
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dataleft -= chainlen;
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}
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tag >>= 1;
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}
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}
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}
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return d - dest;
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}
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static int rle_unpack(const unsigned char *src, unsigned char *dest,
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int src_count, int src_size, int dest_len)
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{
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unsigned char *pd;
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int i, l, used = 0;
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unsigned char *dest_end = dest + dest_len;
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GetByteContext gb;
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uint16_t run_val;
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bytestream2_init(&gb, src, src_size);
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pd = dest;
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if (src_count & 1) {
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if (bytestream2_get_bytes_left(&gb) < 1)
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return 0;
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*pd++ = bytestream2_get_byteu(&gb);
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used++;
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}
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do {
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if (bytestream2_get_bytes_left(&gb) < 1)
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break;
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l = bytestream2_get_byteu(&gb);
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if (l & 0x80) {
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l = (l & 0x7F) * 2;
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if (dest_end - pd < l || bytestream2_get_bytes_left(&gb) < l)
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return bytestream2_tell(&gb);
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bytestream2_get_bufferu(&gb, pd, l);
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pd += l;
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} else {
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if (dest_end - pd < 2*l || bytestream2_get_bytes_left(&gb) < 2)
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return bytestream2_tell(&gb);
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run_val = bytestream2_get_ne16(&gb);
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for (i = 0; i < l; i++) {
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AV_WN16(pd, run_val);
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pd += 2;
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}
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l *= 2;
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}
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used += l;
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} while (used < src_count);
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return bytestream2_tell(&gb);
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}
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static int vmd_decode(VmdVideoContext *s, AVFrame *frame)
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{
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int i;
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unsigned int *palette32;
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unsigned char r, g, b;
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GetByteContext gb;
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unsigned char meth;
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unsigned char *dp; /* pointer to current frame */
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unsigned char *pp; /* pointer to previous frame */
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unsigned char len;
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int ofs;
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int frame_x, frame_y;
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int frame_width, frame_height;
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frame_x = AV_RL16(&s->buf[6]);
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frame_y = AV_RL16(&s->buf[8]);
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frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
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frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
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if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
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(frame_x || frame_y)) {
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s->x_off = frame_x;
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s->y_off = frame_y;
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}
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frame_x -= s->x_off;
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frame_y -= s->y_off;
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if (frame_x < 0 || frame_width < 0 ||
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frame_x >= s->avctx->width ||
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frame_width > s->avctx->width ||
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frame_x + frame_width > s->avctx->width) {
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av_log(s->avctx, AV_LOG_ERROR,
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"Invalid horizontal range %d-%d\n",
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frame_x, frame_width);
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return AVERROR_INVALIDDATA;
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}
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if (frame_y < 0 || frame_height < 0 ||
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frame_y >= s->avctx->height ||
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frame_height > s->avctx->height ||
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frame_y + frame_height > s->avctx->height) {
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av_log(s->avctx, AV_LOG_ERROR,
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"Invalid vertical range %d-%d\n",
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frame_y, frame_height);
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return AVERROR_INVALIDDATA;
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}
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/* if only a certain region will be updated, copy the entire previous
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* frame before the decode */
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if (s->prev_frame->data[0] &&
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(frame_x || frame_y || (frame_width != s->avctx->width) ||
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(frame_height != s->avctx->height))) {
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memcpy(frame->data[0], s->prev_frame->data[0],
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s->avctx->height * frame->linesize[0]);
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}
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/* check if there is a new palette */
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bytestream2_init(&gb, s->buf + 16, s->size - 16);
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if (s->buf[15] & 0x02) {
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bytestream2_skip(&gb, 2);
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palette32 = (unsigned int *)s->palette;
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if (bytestream2_get_bytes_left(&gb) >= PALETTE_COUNT * 3) {
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for (i = 0; i < PALETTE_COUNT; i++) {
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r = bytestream2_get_byteu(&gb) * 4;
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g = bytestream2_get_byteu(&gb) * 4;
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b = bytestream2_get_byteu(&gb) * 4;
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palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);
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palette32[i] |= palette32[i] >> 6 & 0x30303;
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}
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} else {
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av_log(s->avctx, AV_LOG_ERROR, "Incomplete palette\n");
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return AVERROR_INVALIDDATA;
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}
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}
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if (!s->size)
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return 0;
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/* originally UnpackFrame in VAG's code */
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if (bytestream2_get_bytes_left(&gb) < 1)
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return AVERROR_INVALIDDATA;
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meth = bytestream2_get_byteu(&gb);
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if (meth & 0x80) {
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int size;
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if (!s->unpack_buffer_size) {
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av_log(s->avctx, AV_LOG_ERROR,
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"Trying to unpack LZ-compressed frame with no LZ buffer\n");
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return AVERROR_INVALIDDATA;
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}
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size = lz_unpack(gb.buffer, bytestream2_get_bytes_left(&gb),
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s->unpack_buffer, s->unpack_buffer_size);
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if (size < 0)
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return size;
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meth &= 0x7F;
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bytestream2_init(&gb, s->unpack_buffer, size);
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}
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dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x];
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pp = &s->prev_frame->data[0][frame_y * s->prev_frame->linesize[0] + frame_x];
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switch (meth) {
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case 1:
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for (i = 0; i < frame_height; i++) {
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ofs = 0;
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do {
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len = bytestream2_get_byte(&gb);
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if (len & 0x80) {
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len = (len & 0x7F) + 1;
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if (ofs + len > frame_width ||
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bytestream2_get_bytes_left(&gb) < len)
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return AVERROR_INVALIDDATA;
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bytestream2_get_bufferu(&gb, &dp[ofs], len);
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ofs += len;
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} else {
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/* interframe pixel copy */
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if (ofs + len + 1 > frame_width || !s->prev_frame->data[0])
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return AVERROR_INVALIDDATA;
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memcpy(&dp[ofs], &pp[ofs], len + 1);
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ofs += len + 1;
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}
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} while (ofs < frame_width);
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if (ofs > frame_width) {
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av_log(s->avctx, AV_LOG_ERROR,
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"offset > width (%d > %d)\n",
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ofs, frame_width);
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return AVERROR_INVALIDDATA;
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}
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dp += frame->linesize[0];
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pp += s->prev_frame->linesize[0];
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}
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break;
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case 2:
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for (i = 0; i < frame_height; i++) {
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bytestream2_get_buffer(&gb, dp, frame_width);
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dp += frame->linesize[0];
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pp += s->prev_frame->linesize[0];
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}
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break;
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case 3:
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for (i = 0; i < frame_height; i++) {
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ofs = 0;
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do {
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len = bytestream2_get_byte(&gb);
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if (len & 0x80) {
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len = (len & 0x7F) + 1;
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if (bytestream2_peek_byte(&gb) == 0xFF) {
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int slen = len;
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bytestream2_get_byte(&gb);
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len = rle_unpack(gb.buffer, &dp[ofs],
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len, bytestream2_get_bytes_left(&gb),
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frame_width - ofs);
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ofs += slen;
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bytestream2_skip(&gb, len);
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} else {
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if (ofs + len > frame_width ||
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bytestream2_get_bytes_left(&gb) < len)
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return AVERROR_INVALIDDATA;
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bytestream2_get_buffer(&gb, &dp[ofs], len);
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ofs += len;
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}
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} else {
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/* interframe pixel copy */
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if (ofs + len + 1 > frame_width || !s->prev_frame->data[0])
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return AVERROR_INVALIDDATA;
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memcpy(&dp[ofs], &pp[ofs], len + 1);
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ofs += len + 1;
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}
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} while (ofs < frame_width);
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if (ofs > frame_width) {
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av_log(s->avctx, AV_LOG_ERROR,
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"offset > width (%d > %d)\n",
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ofs, frame_width);
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return AVERROR_INVALIDDATA;
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}
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dp += frame->linesize[0];
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pp += s->prev_frame->linesize[0];
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}
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break;
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}
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return 0;
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}
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static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)
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{
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VmdVideoContext *s = avctx->priv_data;
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av_frame_free(&s->prev_frame);
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av_freep(&s->unpack_buffer);
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s->unpack_buffer_size = 0;
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return 0;
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}
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static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
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{
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VmdVideoContext *s = avctx->priv_data;
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int i;
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unsigned int *palette32;
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int palette_index = 0;
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unsigned char r, g, b;
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unsigned char *vmd_header;
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unsigned char *raw_palette;
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s->avctx = avctx;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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/* make sure the VMD header made it */
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if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
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av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n",
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VMD_HEADER_SIZE);
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return AVERROR_INVALIDDATA;
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}
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vmd_header = (unsigned char *)avctx->extradata;
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s->unpack_buffer_size = AV_RL32(&vmd_header[800]);
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if (s->unpack_buffer_size) {
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s->unpack_buffer = av_malloc(s->unpack_buffer_size);
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if (!s->unpack_buffer)
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return AVERROR(ENOMEM);
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}
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/* load up the initial palette */
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raw_palette = &vmd_header[28];
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palette32 = (unsigned int *)s->palette;
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for (i = 0; i < PALETTE_COUNT; i++) {
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r = raw_palette[palette_index++] * 4;
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g = raw_palette[palette_index++] * 4;
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b = raw_palette[palette_index++] * 4;
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palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b);
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palette32[i] |= palette32[i] >> 6 & 0x30303;
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}
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s->prev_frame = av_frame_alloc();
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if (!s->prev_frame) {
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vmdvideo_decode_end(avctx);
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static int vmdvideo_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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VmdVideoContext *s = avctx->priv_data;
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AVFrame *frame = data;
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int ret;
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s->buf = buf;
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s->size = buf_size;
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if (buf_size < 16)
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return AVERROR_INVALIDDATA;
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if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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if ((ret = vmd_decode(s, frame)) < 0)
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return ret;
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/* make the palette available on the way out */
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memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
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/* shuffle frames */
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av_frame_unref(s->prev_frame);
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if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
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return ret;
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*got_frame = 1;
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/* report that the buffer was completely consumed */
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return buf_size;
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}
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AVCodec ff_vmdvideo_decoder = {
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.name = "vmdvideo",
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.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_VMDVIDEO,
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.priv_data_size = sizeof(VmdVideoContext),
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.init = vmdvideo_decode_init,
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.close = vmdvideo_decode_end,
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.decode = vmdvideo_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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