mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 14110 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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/*
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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 eacmv.c |
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* Electronic Arts CMV Video Decoder |
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* by Peter Ross (suxen_drol at hotmail dot com) |
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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 "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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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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const uint8_t *buf, int buf_size) |
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{ |
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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 (avcodec_check_dimensions(s->avctx, s->width, s->height)) |
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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 eacmv_decoder = { |
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"eacmv", |
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CODEC_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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