static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ MpegEncContext * const s = avctx->priv_data; MJpegContext * const m = s->mjpeg_ctx; AVFrame *pict = data; const int width= s->width; const int height= s->height; AVFrame * const p= (AVFrame*)&s->current_picture; const int predictor= avctx->prediction_method+1; init_put_bits(&s->pb, buf, buf_size); *p = *pict; p->pict_type= FF_I_TYPE; p->key_frame= 1; ff_mjpeg_encode_picture_header(s); s->header_bits= put_bits_count(&s->pb); if(avctx->pix_fmt == PIX_FMT_RGB32){ int x, y, i; const int linesize= p->linesize[0]; uint16_t (*buffer)[4]= (void *) s->rd_scratchpad; int left[3], top[3], topleft[3]; for(i=0; i<3; i++){ buffer[0][i]= 1 << (9 - 1); } for(y = 0; y < height; y++) { const int modified_predictor= y ? predictor : 1; uint8_t *ptr = p->data[0] + (linesize * y); if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){ av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n"); return -1; } for(i=0; i<3; i++){ top[i]= left[i]= topleft[i]= buffer[0][i]; } for(x = 0; x < width; x++) { buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100; buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100; buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2; for(i=0;i<3;i++) { int pred, diff; PREDICT(pred, topleft[i], top[i], left[i], modified_predictor); topleft[i]= top[i]; top[i]= buffer[x+1][i]; left[i]= buffer[x][i]; diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100; if(i==0) ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly else ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance); } } } }else{ int mb_x, mb_y, i; const int mb_width = (width + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0]; const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0]; for(mb_y = 0; mb_y < mb_height; mb_y++) { if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < mb_width * 4 * 3 * s->mjpeg_hsample[0] * s->mjpeg_vsample[0]){ av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n"); return -1; } for(mb_x = 0; mb_x < mb_width; mb_x++) { if(mb_x==0 || mb_y==0){ for(i=0;i<3;i++) { uint8_t *ptr; int x, y, h, v, linesize; h = s->mjpeg_hsample[i]; v = s->mjpeg_vsample[i]; linesize= p->linesize[i]; for(y=0; y<v; y++){ for(x=0; x<h; x++){ int pred; ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap if(y==0 && mb_y==0){ if(x==0 && mb_x==0){ pred= 128; }else{ pred= ptr[-1]; } }else{ if(x==0 && mb_x==0){ pred= ptr[-linesize]; }else{ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor); } } if(i==0) ff_mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly else ff_mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance); } } } }else{ for(i=0;i<3;i++) { uint8_t *ptr; int x, y, h, v, linesize; h = s->mjpeg_hsample[i]; v = s->mjpeg_vsample[i]; linesize= p->linesize[i]; for(y=0; y<v; y++){ for(x=0; x<h; x++){ int pred; ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap //printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr); PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor); if(i==0) ff_mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly else ff_mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance); } } } } } } } emms_c(); ff_mjpeg_encode_picture_trailer(s); s->picture_number++; flush_put_bits(&s->pb); return pbBufPtr(&s->pb) - s->pb.buf; // return (put_bits_count(&f->pb)+7)/8; }