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![Reinhard Tartler](/assets/img/avatar_default.png)
It is pretty hopeless that other considerable projects will adopt libavutil alone in other projects. Projects that need small footprint are better off with more specialized libraries such as gnulib or rather just copy the necessary parts that they need. With this in mind, nobody is helped by having libavutil and libavcore split. In order to ease maintenance inside and around FFmpeg and to reduce confusion where to put common code, avcore's functionality is merged (back) to avutil. Signed-off-by: Reinhard Tartler <siretart@tauware.de>
220 lines
6.8 KiB
C
220 lines
6.8 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/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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typedef struct CmvContext {
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AVCodecContext *avctx;
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AVFrame frame; ///< current
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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 = PIX_FMT_PAL8;
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return 0;
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}
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static void cmv_decode_intra(CmvContext * s, const uint8_t *buf, const uint8_t *buf_end){
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unsigned char *dst = s->frame.data[0];
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int i;
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for (i=0; i < s->avctx->height && buf+s->avctx->width<=buf_end; i++) {
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memcpy(dst, buf, s->avctx->width);
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dst += s->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, const uint8_t *buf, const uint8_t *buf_end){
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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+i<buf_end; x++) {
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if (buf[i]==0xFF) {
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unsigned char *dst = s->frame.data[0] + (y*4)*s->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+s->frame.linesize[0], raw+4, 4);
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memcpy(dst+2*s->frame.linesize[0], raw+8, 4);
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memcpy(dst+3*s->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(s->frame.data[0], s->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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cmv_motcomp(s->frame.data[0], s->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+16>=buf_end) {
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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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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+2<buf_end; i++) {
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s->palette[i] = 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 *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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CmvContext *s = avctx->priv_data;
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const uint8_t *buf_end = buf + buf_size;
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if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
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cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
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return 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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/* shuffle */
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if (s->last2_frame.data[0])
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avctx->release_buffer(avctx, &s->last2_frame);
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FFSWAP(AVFrame, s->last_frame, s->last2_frame);
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FFSWAP(AVFrame, s->frame, s->last_frame);
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s->frame.reference = 1;
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
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if (avctx->get_buffer(avctx, &s->frame)<0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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memcpy(s->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, buf+2, buf_end);
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s->frame.key_frame = 0;
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s->frame.pict_type = FF_P_TYPE;
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}else{
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s->frame.key_frame = 1;
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s->frame.pict_type = FF_I_TYPE;
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cmv_decode_intra(s, buf+2, buf_end);
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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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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if (s->frame.data[0])
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s->avctx->release_buffer(avctx, &s->frame);
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if (s->last_frame.data[0])
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s->avctx->release_buffer(avctx, &s->last_frame);
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if (s->last2_frame.data[0])
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s->avctx->release_buffer(avctx, &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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"eacmv",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_CMV,
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sizeof(CmvContext),
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cmv_decode_init,
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NULL,
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cmv_decode_end,
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cmv_decode_frame,
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CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
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};
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