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00031 #include "libavutil/intreadwrite.h"
00032 #include "libavutil/imgutils.h"
00033 #include "avcodec.h"
00034
00035 typedef struct CmvContext {
00036 AVCodecContext *avctx;
00037 AVFrame frame;
00038 AVFrame last_frame;
00039 AVFrame last2_frame;
00040 int width, height;
00041 unsigned int palette[AVPALETTE_COUNT];
00042 } CmvContext;
00043
00044 static av_cold int cmv_decode_init(AVCodecContext *avctx){
00045 CmvContext *s = avctx->priv_data;
00046 s->avctx = avctx;
00047 avctx->pix_fmt = PIX_FMT_PAL8;
00048 return 0;
00049 }
00050
00051 static void cmv_decode_intra(CmvContext * s, const uint8_t *buf, const uint8_t *buf_end){
00052 unsigned char *dst = s->frame.data[0];
00053 int i;
00054
00055 for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
00056 memcpy(dst, buf, s->avctx->width);
00057 dst += s->frame.linesize[0];
00058 buf += s->avctx->width;
00059 }
00060 }
00061
00062 static void cmv_motcomp(unsigned char *dst, int dst_stride,
00063 const unsigned char *src, int src_stride,
00064 int x, int y,
00065 int xoffset, int yoffset,
00066 int width, int height){
00067 int i,j;
00068
00069 for(j=y;j<y+4;j++)
00070 for(i=x;i<x+4;i++)
00071 {
00072 if (i+xoffset>=0 && i+xoffset<width &&
00073 j+yoffset>=0 && j+yoffset<height) {
00074 dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
00075 }else{
00076 dst[j*dst_stride + i] = 0;
00077 }
00078 }
00079 }
00080
00081 static void cmv_decode_inter(CmvContext * s, const uint8_t *buf, const uint8_t *buf_end){
00082 const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
00083 int x,y,i;
00084
00085 i = 0;
00086 for(y=0; y<s->avctx->height/4; y++)
00087 for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
00088 if (buf[i]==0xFF) {
00089 unsigned char *dst = s->frame.data[0] + (y*4)*s->frame.linesize[0] + x*4;
00090 if (raw+16<buf_end && *raw==0xFF) {
00091 raw++;
00092 memcpy(dst, raw, 4);
00093 memcpy(dst+s->frame.linesize[0], raw+4, 4);
00094 memcpy(dst+2*s->frame.linesize[0], raw+8, 4);
00095 memcpy(dst+3*s->frame.linesize[0], raw+12, 4);
00096 raw+=16;
00097 }else if(raw<buf_end) {
00098 int xoffset = (*raw & 0xF) - 7;
00099 int yoffset = ((*raw >> 4)) - 7;
00100 if (s->last2_frame.data[0])
00101 cmv_motcomp(s->frame.data[0], s->frame.linesize[0],
00102 s->last2_frame.data[0], s->last2_frame.linesize[0],
00103 x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
00104 raw++;
00105 }
00106 }else{
00107 int xoffset = (buf[i] & 0xF) - 7;
00108 int yoffset = ((buf[i] >> 4)) - 7;
00109 if (s->last_frame.data[0])
00110 cmv_motcomp(s->frame.data[0], s->frame.linesize[0],
00111 s->last_frame.data[0], s->last_frame.linesize[0],
00112 x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
00113 }
00114 i++;
00115 }
00116 }
00117
00118 static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
00119 {
00120 int pal_start, pal_count, i;
00121
00122 if(buf_end - buf < 16) {
00123 av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
00124 return;
00125 }
00126
00127 s->width = AV_RL16(&buf[4]);
00128 s->height = AV_RL16(&buf[6]);
00129 if (s->avctx->width!=s->width || s->avctx->height!=s->height)
00130 avcodec_set_dimensions(s->avctx, s->width, s->height);
00131
00132 s->avctx->time_base.num = 1;
00133 s->avctx->time_base.den = AV_RL16(&buf[10]);
00134
00135 pal_start = AV_RL16(&buf[12]);
00136 pal_count = AV_RL16(&buf[14]);
00137
00138 buf += 16;
00139 for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
00140 s->palette[i] = AV_RB24(buf);
00141 buf += 3;
00142 }
00143 }
00144
00145 #define EA_PREAMBLE_SIZE 8
00146 #define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
00147
00148 static int cmv_decode_frame(AVCodecContext *avctx,
00149 void *data, int *data_size,
00150 AVPacket *avpkt)
00151 {
00152 const uint8_t *buf = avpkt->data;
00153 int buf_size = avpkt->size;
00154 CmvContext *s = avctx->priv_data;
00155 const uint8_t *buf_end = buf + buf_size;
00156
00157 if (buf_end - buf < EA_PREAMBLE_SIZE)
00158 return AVERROR_INVALIDDATA;
00159
00160 if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
00161 cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
00162 return buf_size;
00163 }
00164
00165 if (av_image_check_size(s->width, s->height, 0, s->avctx))
00166 return -1;
00167
00168
00169 if (s->last2_frame.data[0])
00170 avctx->release_buffer(avctx, &s->last2_frame);
00171 FFSWAP(AVFrame, s->last_frame, s->last2_frame);
00172 FFSWAP(AVFrame, s->frame, s->last_frame);
00173
00174 s->frame.reference = 1;
00175 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
00176 if (avctx->get_buffer(avctx, &s->frame)<0) {
00177 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00178 return -1;
00179 }
00180
00181 memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
00182
00183 buf += EA_PREAMBLE_SIZE;
00184 if ((buf[0]&1)) {
00185 cmv_decode_inter(s, buf+2, buf_end);
00186 s->frame.key_frame = 0;
00187 s->frame.pict_type = AV_PICTURE_TYPE_P;
00188 }else{
00189 s->frame.key_frame = 1;
00190 s->frame.pict_type = AV_PICTURE_TYPE_I;
00191 cmv_decode_intra(s, buf+2, buf_end);
00192 }
00193
00194 *data_size = sizeof(AVFrame);
00195 *(AVFrame*)data = s->frame;
00196
00197 return buf_size;
00198 }
00199
00200 static av_cold int cmv_decode_end(AVCodecContext *avctx){
00201 CmvContext *s = avctx->priv_data;
00202 if (s->frame.data[0])
00203 s->avctx->release_buffer(avctx, &s->frame);
00204 if (s->last_frame.data[0])
00205 s->avctx->release_buffer(avctx, &s->last_frame);
00206 if (s->last2_frame.data[0])
00207 s->avctx->release_buffer(avctx, &s->last2_frame);
00208
00209 return 0;
00210 }
00211
00212 AVCodec ff_eacmv_decoder = {
00213 .name = "eacmv",
00214 .type = AVMEDIA_TYPE_VIDEO,
00215 .id = CODEC_ID_CMV,
00216 .priv_data_size = sizeof(CmvContext),
00217 .init = cmv_decode_init,
00218 .close = cmv_decode_end,
00219 .decode = cmv_decode_frame,
00220 .capabilities = CODEC_CAP_DR1,
00221 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
00222 };