mirror of https://git.ffmpeg.org/ffmpeg.git
582 lines
16 KiB
C
582 lines
16 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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/**
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* @file vmdvideo.c
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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 <unistd.h>
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.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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DSPContext dsp;
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AVFrame frame;
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AVFrame prev_frame;
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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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} 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(unsigned char *src, unsigned char *dest)
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{
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unsigned char *s;
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unsigned char *d;
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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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dataleft = LE_32(s);
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s += 4;
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memset(queue, QUEUE_SIZE, 0x20);
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if (LE_32(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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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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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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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(unsigned char *src, unsigned char *dest, int len)
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{
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unsigned char *ps;
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unsigned char *pd;
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int i, l;
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ps = src;
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pd = dest;
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if (len & 1)
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*pd++ = *ps++;
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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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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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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 < 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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unsigned char *p = s->buf + 16;
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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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frame_x = LE_16(&s->buf[6]);
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frame_y = LE_16(&s->buf[8]);
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frame_width = LE_16(&s->buf[10]) - frame_x + 1;
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frame_height = LE_16(&s->buf[12]) - frame_y + 1;
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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);
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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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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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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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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);
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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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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 int vmdvideo_decode_init(AVCodecContext *avctx)
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{
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VmdVideoContext *s = (VmdVideoContext *)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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avctx->has_b_frames = 0;
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dsputil_init(&s->dsp, avctx);
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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 = av_malloc(LE_32(&vmd_header[800]));
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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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s->frame.data[0] = s->prev_frame.data[0] = NULL;
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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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uint8_t *buf, int buf_size)
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{
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VmdVideoContext *s = (VmdVideoContext *)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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if (s->prev_frame.data[0])
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avctx->release_buffer(avctx, &s->prev_frame);
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/* shuffle frames */
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s->prev_frame = s->frame;
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->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 int vmdvideo_decode_end(AVCodecContext *avctx)
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{
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VmdVideoContext *s = (VmdVideoContext *)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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typedef struct VmdAudioContext {
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AVCodecContext *avctx;
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int channels;
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int bits;
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int block_align;
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unsigned char steps8[16];
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unsigned short steps16[16];
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unsigned short steps128[256];
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short predictors[2];
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} VmdAudioContext;
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static int vmdaudio_decode_init(AVCodecContext *avctx)
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{
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VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
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int i;
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s->avctx = avctx;
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s->channels = avctx->channels;
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s->bits = avctx->bits_per_sample;
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s->block_align = avctx->block_align;
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av_log(s->avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, block align = %d, sample rate = %d\n",
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s->channels, s->bits, s->block_align, avctx->sample_rate);
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/* set up the steps8 and steps16 tables */
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for (i = 0; i < 8; i++) {
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if (i < 4)
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s->steps8[i] = i;
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else
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s->steps8[i] = s->steps8[i - 1] + i - 1;
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if (i == 0)
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s->steps16[i] = 0;
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else if (i == 1)
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s->steps16[i] = 4;
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else if (i == 2)
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s->steps16[i] = 16;
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else
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s->steps16[i] = 1 << (i + 4);
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}
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/* set up the step128 table */
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s->steps128[0] = 0;
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s->steps128[1] = 8;
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for (i = 0x02; i <= 0x20; i++)
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s->steps128[i] = (i - 1) << 4;
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for (i = 0x21; i <= 0x60; i++)
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s->steps128[i] = (i + 0x1F) << 3;
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for (i = 0x61; i <= 0x70; i++)
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s->steps128[i] = (i - 0x51) << 6;
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for (i = 0x71; i <= 0x78; i++)
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s->steps128[i] = (i - 0x69) << 8;
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for (i = 0x79; i <= 0x7D; i++)
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s->steps128[i] = (i - 0x75) << 10;
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s->steps128[0x7E] = 0x3000;
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s->steps128[0x7F] = 0x4000;
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/* set up the negative half of each table */
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for (i = 0; i < 8; i++) {
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s->steps8[i + 8] = -s->steps8[i];
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s->steps16[i + 8] = -s->steps16[i];
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}
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for (i = 0; i < 128; i++)
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s->steps128[i + 128] = -s->steps128[i];
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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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uint8_t *buf, int ratio) {
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}
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static int vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
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uint8_t *buf, int silence)
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{
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int bytes_decoded = 0;
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int i;
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if (silence)
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av_log(s->avctx, AV_LOG_INFO, "silent block!\n");
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if (s->channels == 2) {
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/* stereo handling */
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if ((s->block_align & 0x01) == 0) {
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if (silence)
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memset(data, 0, s->block_align * 2);
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else
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vmdaudio_decode_audio(s, data, buf, 1);
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} else {
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if (silence)
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memset(data, 0, s->block_align * 2);
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else
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vmdaudio_decode_audio(s, data, buf, 1);
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}
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} else {
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/* mono handling */
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if (silence) {
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if (s->bits == 16) {
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memset(data, 0, s->block_align * 2);
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bytes_decoded = s->block_align * 2;
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} else {
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// memset(data, 0x00, s->block_align);
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// bytes_decoded = s->block_align;
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memset(data, 0x00, s->block_align * 2);
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bytes_decoded = s->block_align * 2;
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}
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} else {
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if (s->bits == 16) {
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} else {
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/* copy the data but convert it to signed */
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for (i = 0; i < s->block_align; i++)
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data[i * 2 + 1] = buf[i] + 0x80;
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bytes_decoded = s->block_align * 2;
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}
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}
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}
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return bytes_decoded;
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}
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static int vmdaudio_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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{
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VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
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unsigned int sound_flags;
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unsigned char *output_samples = (unsigned char *)data;
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/* point to the start of the encoded data */
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unsigned char *p = buf + 16;
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unsigned char *p_end = buf + buf_size;
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if (buf_size < 16)
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return buf_size;
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if (buf[6] == 1) {
|
|
/* the chunk contains audio */
|
|
*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);
|
|
p += 4;
|
|
|
|
/* do something with extrabufs here? */
|
|
|
|
while (p < p_end) {
|
|
if (sound_flags & 0x01)
|
|
/* silence */
|
|
*data_size += vmdaudio_loadsound(s, output_samples, p, 1);
|
|
else {
|
|
/* audio */
|
|
*data_size += vmdaudio_loadsound(s, output_samples, p, 0);
|
|
p += s->block_align;
|
|
}
|
|
output_samples += (s->block_align * s->bits / 8);
|
|
sound_flags >>= 1;
|
|
}
|
|
} else if (buf[6] == 3) {
|
|
/* silent chunk */
|
|
*data_size = vmdaudio_loadsound(s, output_samples, p, 1);
|
|
}
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
|
|
/*
|
|
* Public Data Structures
|
|
*/
|
|
|
|
AVCodec vmdvideo_decoder = {
|
|
"vmdvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_VMDVIDEO,
|
|
sizeof(VmdVideoContext),
|
|
vmdvideo_decode_init,
|
|
NULL,
|
|
vmdvideo_decode_end,
|
|
vmdvideo_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|
|
|
|
AVCodec vmdaudio_decoder = {
|
|
"vmdaudio",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_VMDAUDIO,
|
|
sizeof(VmdAudioContext),
|
|
vmdaudio_decode_init,
|
|
NULL,
|
|
NULL,
|
|
vmdaudio_decode_frame,
|
|
};
|