forked from KolibriOS/kolibrios
237 lines
7.4 KiB
C
237 lines
7.4 KiB
C
/*
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* Electronic Arts CMV Video Decoder
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* Copyright (c) 2007-2008 Peter Ross
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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 St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Electronic Arts CMV Video Decoder
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* by Peter Ross (pross@xvid.org)
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*
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* Technical details here:
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* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
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*/
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "internal.h"
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typedef struct CmvContext {
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AVCodecContext *avctx;
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AVFrame *last_frame; ///< last
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AVFrame *last2_frame; ///< second-last
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int width, height;
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unsigned int palette[AVPALETTE_COUNT];
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} CmvContext;
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static av_cold int cmv_decode_init(AVCodecContext *avctx){
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CmvContext *s = avctx->priv_data;
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s->avctx = avctx;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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s->last_frame = av_frame_alloc();
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s->last2_frame = av_frame_alloc();
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if (!s->last_frame || !s->last2_frame) {
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av_frame_free(&s->last_frame);
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av_frame_free(&s->last2_frame);
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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 void cmv_decode_intra(CmvContext * s, AVFrame *frame,
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const uint8_t *buf, const uint8_t *buf_end)
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{
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unsigned char *dst = frame->data[0];
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int i;
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for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
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memcpy(dst, buf, s->avctx->width);
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dst += frame->linesize[0];
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buf += s->avctx->width;
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}
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}
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static void cmv_motcomp(unsigned char *dst, int dst_stride,
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const unsigned char *src, int src_stride,
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int x, int y,
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int xoffset, int yoffset,
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int width, int height){
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int i,j;
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for(j=y;j<y+4;j++)
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for(i=x;i<x+4;i++)
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{
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if (i+xoffset>=0 && i+xoffset<width &&
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j+yoffset>=0 && j+yoffset<height) {
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dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
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}else{
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dst[j*dst_stride + i] = 0;
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}
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}
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}
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static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,
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const uint8_t *buf_end)
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{
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const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
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int x,y,i;
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i = 0;
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for(y=0; y<s->avctx->height/4; y++)
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for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
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if (buf[i]==0xFF) {
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unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
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if (raw+16<buf_end && *raw==0xFF) { /* intra */
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raw++;
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memcpy(dst, raw, 4);
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memcpy(dst + frame->linesize[0], raw+4, 4);
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memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
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memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
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raw+=16;
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}else if(raw<buf_end) { /* inter using second-last frame as reference */
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int xoffset = (*raw & 0xF) - 7;
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int yoffset = ((*raw >> 4)) - 7;
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if (s->last2_frame->data[0])
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cmv_motcomp(frame->data[0], frame->linesize[0],
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s->last2_frame->data[0], s->last2_frame->linesize[0],
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x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
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raw++;
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}
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}else{ /* inter using last frame as reference */
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int xoffset = (buf[i] & 0xF) - 7;
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int yoffset = ((buf[i] >> 4)) - 7;
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if (s->last_frame->data[0])
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cmv_motcomp(frame->data[0], frame->linesize[0],
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s->last_frame->data[0], s->last_frame->linesize[0],
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x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
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}
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i++;
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}
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}
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static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
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{
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int pal_start, pal_count, i;
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if(buf_end - buf < 16) {
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av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
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return;
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}
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s->width = AV_RL16(&buf[4]);
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s->height = AV_RL16(&buf[6]);
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if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
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avcodec_set_dimensions(s->avctx, s->width, s->height);
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av_frame_unref(s->last_frame);
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av_frame_unref(s->last2_frame);
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}
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s->avctx->time_base.num = 1;
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s->avctx->time_base.den = AV_RL16(&buf[10]);
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pal_start = AV_RL16(&buf[12]);
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pal_count = AV_RL16(&buf[14]);
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buf += 16;
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for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
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s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
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buf += 3;
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}
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}
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#define EA_PREAMBLE_SIZE 8
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#define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
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static int cmv_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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CmvContext *s = avctx->priv_data;
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const uint8_t *buf_end = buf + buf_size;
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AVFrame *frame = data;
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int ret;
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if (buf_end - buf < EA_PREAMBLE_SIZE)
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return AVERROR_INVALIDDATA;
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if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
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unsigned size = AV_RL32(buf + 4);
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cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
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if (size > buf_end - buf - EA_PREAMBLE_SIZE)
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return -1;
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buf += size;
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}
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if (av_image_check_size(s->width, s->height, 0, s->avctx))
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return -1;
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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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memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
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buf += EA_PREAMBLE_SIZE;
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if ((buf[0]&1)) { // subtype
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cmv_decode_inter(s, frame, buf+2, buf_end);
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frame->key_frame = 0;
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frame->pict_type = AV_PICTURE_TYPE_P;
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}else{
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frame->key_frame = 1;
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frame->pict_type = AV_PICTURE_TYPE_I;
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cmv_decode_intra(s, frame, buf+2, buf_end);
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}
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av_frame_unref(s->last2_frame);
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av_frame_move_ref(s->last2_frame, s->last_frame);
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if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
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return ret;
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int cmv_decode_end(AVCodecContext *avctx){
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CmvContext *s = avctx->priv_data;
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av_frame_free(&s->last_frame);
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av_frame_free(&s->last2_frame);
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return 0;
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}
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AVCodec ff_eacmv_decoder = {
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.name = "eacmv",
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_CMV,
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.priv_data_size = sizeof(CmvContext),
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.init = cmv_decode_init,
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.close = cmv_decode_end,
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.decode = cmv_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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