572 lines
17 KiB
C
572 lines
17 KiB
C
/*
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* Sierra VMD Audio & Video Decoders
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* Copyright (C) 2004 the ffmpeg project
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 audio & video decoders
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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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* The audio decoder, like the video decoder, expects each encoded data
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* chunk to be prepended with the appropriate 16-byte frame information
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* record from the VMD file. It does not require the 0x330-byte VMD file
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* header, but it does need the audio setup parameters passed in through
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* normal libavcodec API means.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#define VMD_HEADER_SIZE 0x330
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#define PALETTE_COUNT 256
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/*
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* Video Decoder
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*/
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typedef struct VmdVideoContext {
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AVCodecContext *avctx;
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AVFrame frame;
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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 void lz_unpack(const unsigned char *src, unsigned char *dest, int dest_len)
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{
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const unsigned char *s;
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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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s = src;
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d = dest;
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d_end = d + dest_len;
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dataleft = AV_RL32(s);
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s += 4;
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memset(queue, 0x20, QUEUE_SIZE);
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if (AV_RL32(s) == 0x56781234) {
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s += 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) {
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tag = *s++;
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if ((tag == 0xFF) && (dataleft > 8)) {
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if (d + 8 > d_end)
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return;
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for (i = 0; i < 8; i++) {
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queue[qpos++] = *d++ = *s++;
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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 + 1 > d_end)
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return;
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queue[qpos++] = *d++ = *s++;
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qpos &= QUEUE_MASK;
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dataleft--;
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} else {
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chainofs = *s++;
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chainofs |= ((*s & 0xF0) << 4);
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chainlen = (*s++ & 0x0F) + 3;
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if (chainlen == speclen)
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chainlen = *s++ + 0xF + 3;
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if (d + chainlen > d_end)
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return;
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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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}
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static int rle_unpack(const unsigned char *src, unsigned char *dest,
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int src_len, int dest_len)
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{
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const unsigned char *ps;
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unsigned char *pd;
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int i, l;
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unsigned char *dest_end = dest + dest_len;
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ps = src;
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pd = dest;
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if (src_len & 1)
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*pd++ = *ps++;
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src_len >>= 1;
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i = 0;
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do {
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l = *ps++;
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if (l & 0x80) {
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l = (l & 0x7F) * 2;
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if (pd + l > dest_end)
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return ps - src;
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memcpy(pd, ps, l);
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ps += l;
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pd += l;
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} else {
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if (pd + i > dest_end)
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return ps - src;
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for (i = 0; i < l; i++) {
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*pd++ = ps[0];
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*pd++ = ps[1];
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}
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ps += 2;
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}
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i += l;
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} while (i < src_len);
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return ps - src;
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}
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static void vmd_decode(VmdVideoContext *s)
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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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/* point to the start of the encoded data */
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const unsigned char *p = s->buf + 16;
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const unsigned char *pb;
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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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int dp_size;
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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 only a certain region will be updated, copy the entire previous
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* frame before the decode */
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if (frame_x || frame_y || (frame_width != s->avctx->width) ||
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(frame_height != s->avctx->height)) {
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memcpy(s->frame.data[0], s->prev_frame.data[0],
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s->avctx->height * s->frame.linesize[0]);
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}
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/* check if there is a new palette */
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if (s->buf[15] & 0x02) {
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p += 2;
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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 = *p++ * 4;
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g = *p++ * 4;
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b = *p++ * 4;
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palette32[i] = (r << 16) | (g << 8) | (b);
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}
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s->size -= (256 * 3 + 2);
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}
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if (s->size >= 0) {
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/* originally UnpackFrame in VAG's code */
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pb = p;
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meth = *pb++;
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if (meth & 0x80) {
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lz_unpack(pb, s->unpack_buffer, s->unpack_buffer_size);
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meth &= 0x7F;
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pb = s->unpack_buffer;
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}
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dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x];
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dp_size = s->frame.linesize[0] * s->avctx->height;
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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 = *pb++;
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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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return;
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memcpy(&dp[ofs], pb, len);
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pb += 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)
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return;
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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, "VMD video: offset > width (%d > %d)\n",
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ofs, frame_width);
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break;
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}
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dp += s->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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memcpy(dp, pb, frame_width);
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pb += frame_width;
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dp += s->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 = *pb++;
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if (len & 0x80) {
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len = (len & 0x7F) + 1;
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if (*pb++ == 0xFF)
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len = rle_unpack(pb, &dp[ofs], len, frame_width - ofs);
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else
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memcpy(&dp[ofs], pb, len);
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pb += 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)
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return;
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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, "VMD video: offset > width (%d > %d)\n",
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ofs, frame_width);
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}
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dp += s->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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}
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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 = 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, "VMD video: expected extradata size of %d\n",
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VMD_HEADER_SIZE);
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return -1;
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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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s->unpack_buffer = av_malloc(s->unpack_buffer_size);
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if (!s->unpack_buffer)
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return -1;
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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] = (r << 16) | (g << 8) | (b);
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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 *data_size,
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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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s->buf = buf;
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s->size = buf_size;
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if (buf_size < 16)
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return buf_size;
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s->frame.reference = 1;
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if (avctx->get_buffer(avctx, &s->frame)) {
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av_log(s->avctx, AV_LOG_ERROR, "VMD Video: get_buffer() failed\n");
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return -1;
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}
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vmd_decode(s);
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/* make the palette available on the way out */
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memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
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/* shuffle frames */
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FFSWAP(AVFrame, s->frame, s->prev_frame);
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->prev_frame;
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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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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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if (s->prev_frame.data[0])
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avctx->release_buffer(avctx, &s->prev_frame);
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av_free(s->unpack_buffer);
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return 0;
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}
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/*
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* Audio Decoder
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*/
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#define BLOCK_TYPE_AUDIO 1
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#define BLOCK_TYPE_INITIAL 2
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#define BLOCK_TYPE_SILENCE 3
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typedef struct VmdAudioContext {
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AVCodecContext *avctx;
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int out_bps;
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int predictors[2];
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} VmdAudioContext;
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static const uint16_t vmdaudio_table[128] = {
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0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,
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0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,
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0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,
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0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230,
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0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280,
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0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0,
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0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320,
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0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370,
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0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0,
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0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480,
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0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700,
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0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00,
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0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000
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};
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static av_cold int vmdaudio_decode_init(AVCodecContext *avctx)
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{
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VmdAudioContext *s = avctx->priv_data;
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s->avctx = avctx;
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if (avctx->bits_per_coded_sample == 16)
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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else
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avctx->sample_fmt = AV_SAMPLE_FMT_U8;
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s->out_bps = av_get_bits_per_sample_fmt(avctx->sample_fmt) >> 3;
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av_log(avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, "
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"block align = %d, sample rate = %d\n",
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avctx->channels, avctx->bits_per_coded_sample, avctx->block_align,
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avctx->sample_rate);
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return 0;
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}
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static void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data,
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const uint8_t *buf, int buf_size, int stereo)
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{
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int i;
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int chan = 0;
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int16_t *out = (int16_t*)data;
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for(i = 0; i < buf_size; i++) {
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if(buf[i] & 0x80)
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s->predictors[chan] -= vmdaudio_table[buf[i] & 0x7F];
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else
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s->predictors[chan] += vmdaudio_table[buf[i]];
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s->predictors[chan] = av_clip_int16(s->predictors[chan]);
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out[i] = s->predictors[chan];
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chan ^= stereo;
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}
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}
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static int vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
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const uint8_t *buf, int silent_chunks, int data_size)
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{
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int silent_size = s->avctx->block_align * silent_chunks * s->out_bps;
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if (silent_chunks) {
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memset(data, s->out_bps == 2 ? 0x00 : 0x80, silent_size);
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data += silent_size;
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}
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if (s->avctx->bits_per_coded_sample == 16)
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vmdaudio_decode_audio(s, data, buf, data_size, s->avctx->channels == 2);
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else {
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/* just copy the data */
|
|
memcpy(data, buf, data_size);
|
|
}
|
|
|
|
return silent_size + data_size * s->out_bps;
|
|
}
|
|
|
|
static int vmdaudio_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
VmdAudioContext *s = avctx->priv_data;
|
|
int block_type, silent_chunks;
|
|
unsigned char *output_samples = (unsigned char *)data;
|
|
|
|
if (buf_size < 16) {
|
|
av_log(avctx, AV_LOG_WARNING, "skipping small junk packet\n");
|
|
*data_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
block_type = buf[6];
|
|
if (block_type < BLOCK_TYPE_AUDIO || block_type > BLOCK_TYPE_SILENCE) {
|
|
av_log(avctx, AV_LOG_ERROR, "unknown block type: %d\n", block_type);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
buf += 16;
|
|
buf_size -= 16;
|
|
|
|
silent_chunks = 0;
|
|
if (block_type == BLOCK_TYPE_INITIAL) {
|
|
uint32_t flags = AV_RB32(buf);
|
|
silent_chunks = av_popcount(flags);
|
|
buf += 4;
|
|
buf_size -= 4;
|
|
} else if (block_type == BLOCK_TYPE_SILENCE) {
|
|
silent_chunks = 1;
|
|
buf_size = 0; // should already be zero but set it just to be sure
|
|
}
|
|
|
|
/* ensure output buffer is large enough */
|
|
if (*data_size < (avctx->block_align*silent_chunks + buf_size) * s->out_bps)
|
|
return -1;
|
|
|
|
*data_size = vmdaudio_loadsound(s, output_samples, buf, silent_chunks, buf_size);
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
|
|
/*
|
|
* Public Data Structures
|
|
*/
|
|
|
|
AVCodec ff_vmdvideo_decoder = {
|
|
"vmdvideo",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_VMDVIDEO,
|
|
sizeof(VmdVideoContext),
|
|
vmdvideo_decode_init,
|
|
NULL,
|
|
vmdvideo_decode_end,
|
|
vmdvideo_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
|
|
};
|
|
|
|
AVCodec ff_vmdaudio_decoder = {
|
|
"vmdaudio",
|
|
AVMEDIA_TYPE_AUDIO,
|
|
CODEC_ID_VMDAUDIO,
|
|
sizeof(VmdAudioContext),
|
|
vmdaudio_decode_init,
|
|
NULL,
|
|
NULL,
|
|
vmdaudio_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
|
|
};
|