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/* |
* Electronic Arts CMV Video Decoder |
* Copyright (c) 2007-2008 Peter Ross |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* Electronic Arts CMV Video Decoder |
* by Peter Ross (pross@xvid.org) |
* |
* Technical details here: |
* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV |
*/ |
|
#include "libavutil/common.h" |
#include "libavutil/intreadwrite.h" |
#include "libavutil/imgutils.h" |
#include "avcodec.h" |
#include "internal.h" |
|
typedef struct CmvContext { |
AVCodecContext *avctx; |
AVFrame *last_frame; ///< last |
AVFrame *last2_frame; ///< second-last |
int width, height; |
unsigned int palette[AVPALETTE_COUNT]; |
} CmvContext; |
|
static av_cold int cmv_decode_init(AVCodecContext *avctx){ |
CmvContext *s = avctx->priv_data; |
|
s->avctx = avctx; |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
|
s->last_frame = av_frame_alloc(); |
s->last2_frame = av_frame_alloc(); |
if (!s->last_frame || !s->last2_frame) { |
av_frame_free(&s->last_frame); |
av_frame_free(&s->last2_frame); |
return AVERROR(ENOMEM); |
} |
|
return 0; |
} |
|
static void cmv_decode_intra(CmvContext * s, AVFrame *frame, |
const uint8_t *buf, const uint8_t *buf_end) |
{ |
unsigned char *dst = frame->data[0]; |
int i; |
|
for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) { |
memcpy(dst, buf, s->avctx->width); |
dst += frame->linesize[0]; |
buf += s->avctx->width; |
} |
} |
|
static void cmv_motcomp(unsigned char *dst, int dst_stride, |
const unsigned char *src, int src_stride, |
int x, int y, |
int xoffset, int yoffset, |
int width, int height){ |
int i,j; |
|
for(j=y;j<y+4;j++) |
for(i=x;i<x+4;i++) |
{ |
if (i+xoffset>=0 && i+xoffset<width && |
j+yoffset>=0 && j+yoffset<height) { |
dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset]; |
}else{ |
dst[j*dst_stride + i] = 0; |
} |
} |
} |
|
static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf, |
const uint8_t *buf_end) |
{ |
const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16); |
int x,y,i; |
|
i = 0; |
for(y=0; y<s->avctx->height/4; y++) |
for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) { |
if (buf[i]==0xFF) { |
unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4; |
if (raw+16<buf_end && *raw==0xFF) { /* intra */ |
raw++; |
memcpy(dst, raw, 4); |
memcpy(dst + frame->linesize[0], raw+4, 4); |
memcpy(dst + 2 * frame->linesize[0], raw+8, 4); |
memcpy(dst + 3 * frame->linesize[0], raw+12, 4); |
raw+=16; |
}else if(raw<buf_end) { /* inter using second-last frame as reference */ |
int xoffset = (*raw & 0xF) - 7; |
int yoffset = ((*raw >> 4)) - 7; |
if (s->last2_frame->data[0]) |
cmv_motcomp(frame->data[0], frame->linesize[0], |
s->last2_frame->data[0], s->last2_frame->linesize[0], |
x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height); |
raw++; |
} |
}else{ /* inter using last frame as reference */ |
int xoffset = (buf[i] & 0xF) - 7; |
int yoffset = ((buf[i] >> 4)) - 7; |
if (s->last_frame->data[0]) |
cmv_motcomp(frame->data[0], frame->linesize[0], |
s->last_frame->data[0], s->last_frame->linesize[0], |
x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height); |
} |
i++; |
} |
} |
|
static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end) |
{ |
int pal_start, pal_count, i; |
|
if(buf_end - buf < 16) { |
av_log(s->avctx, AV_LOG_WARNING, "truncated header\n"); |
return; |
} |
|
s->width = AV_RL16(&buf[4]); |
s->height = AV_RL16(&buf[6]); |
if (s->avctx->width!=s->width || s->avctx->height!=s->height) { |
avcodec_set_dimensions(s->avctx, s->width, s->height); |
av_frame_unref(s->last_frame); |
av_frame_unref(s->last2_frame); |
} |
|
s->avctx->time_base.num = 1; |
s->avctx->time_base.den = AV_RL16(&buf[10]); |
|
pal_start = AV_RL16(&buf[12]); |
pal_count = AV_RL16(&buf[14]); |
|
buf += 16; |
for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) { |
s->palette[i] = 0xFFU << 24 | AV_RB24(buf); |
buf += 3; |
} |
} |
|
#define EA_PREAMBLE_SIZE 8 |
#define MVIh_TAG MKTAG('M', 'V', 'I', 'h') |
|
static int cmv_decode_frame(AVCodecContext *avctx, |
void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
const uint8_t *buf = avpkt->data; |
int buf_size = avpkt->size; |
CmvContext *s = avctx->priv_data; |
const uint8_t *buf_end = buf + buf_size; |
AVFrame *frame = data; |
int ret; |
|
if (buf_end - buf < EA_PREAMBLE_SIZE) |
return AVERROR_INVALIDDATA; |
|
if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) { |
unsigned size = AV_RL32(buf + 4); |
cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end); |
if (size > buf_end - buf - EA_PREAMBLE_SIZE) |
return -1; |
buf += size; |
} |
|
if (av_image_check_size(s->width, s->height, 0, s->avctx)) |
return -1; |
|
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
return ret; |
|
memcpy(frame->data[1], s->palette, AVPALETTE_SIZE); |
|
buf += EA_PREAMBLE_SIZE; |
if ((buf[0]&1)) { // subtype |
cmv_decode_inter(s, frame, buf+2, buf_end); |
frame->key_frame = 0; |
frame->pict_type = AV_PICTURE_TYPE_P; |
}else{ |
frame->key_frame = 1; |
frame->pict_type = AV_PICTURE_TYPE_I; |
cmv_decode_intra(s, frame, buf+2, buf_end); |
} |
|
av_frame_unref(s->last2_frame); |
av_frame_move_ref(s->last2_frame, s->last_frame); |
if ((ret = av_frame_ref(s->last_frame, frame)) < 0) |
return ret; |
|
*got_frame = 1; |
|
return buf_size; |
} |
|
static av_cold int cmv_decode_end(AVCodecContext *avctx){ |
CmvContext *s = avctx->priv_data; |
|
av_frame_free(&s->last_frame); |
av_frame_free(&s->last2_frame); |
|
return 0; |
} |
|
AVCodec ff_eacmv_decoder = { |
.name = "eacmv", |
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_CMV, |
.priv_data_size = sizeof(CmvContext), |
.init = cmv_decode_init, |
.close = cmv_decode_end, |
.decode = cmv_decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |