int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near, int point_transform, int ilv){ int i, t = 0; uint8_t *zero, *last, *cur; JLSState *state; int off = 0, stride = 1, width, shift; zero = av_mallocz(s->picture.linesize[0]); last = zero; cur = s->picture.data[0]; state = av_mallocz(sizeof(JLSState)); /* initialize JPEG-LS state from JPEG parameters */ state->near = near; state->bpp = (s->bits < 2) ? 2 : s->bits; state->maxval = s->maxval; state->T1 = s->t1; state->T2 = s->t2; state->T3 = s->t3; state->reset = s->reset; ff_jpegls_reset_coding_parameters(state, 0); ff_jpegls_init_state(state); if(s->bits <= 8) shift = point_transform + (8 - s->bits); else shift = point_transform + (16 - s->bits); if (s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n", s->width, s->height, state->near, state->maxval, state->T1, state->T2, state->T3, state->reset, state->limit, state->qbpp, state->range); av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n", ilv, point_transform, s->bits, s->cur_scan); } if(ilv == 0) { /* separate planes */ stride = (s->nb_components > 1) ? 3 : 1; off = av_clip(s->cur_scan - 1, 0, stride); width = s->width * stride; cur += off; for(i = 0; i < s->height; i++) { if(s->bits <= 8){ ls_decode_line(state, s, last, cur, t, width, stride, off, 8); t = last[0]; }else{ ls_decode_line(state, s, last, cur, t, width, stride, off, 16); t = *((uint16_t*)last); } last = cur; cur += s->picture.linesize[0]; if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ } } } else if(ilv == 1) { /* line interleaving */ int j; int Rc[3] = {0, 0, 0}; stride = (s->nb_components > 1) ? 3 : 1; memset(cur, 0, s->picture.linesize[0]); width = s->width * stride; for(i = 0; i < s->height; i++) { for(j = 0; j < stride; j++) { ls_decode_line(state, s, last + j, cur + j, Rc[j], width, stride, j, 8); Rc[j] = last[j]; if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ } } last = cur; cur += s->picture.linesize[0]; } } else if(ilv == 2) { /* sample interleaving */ av_log(s->avctx, AV_LOG_ERROR, "Sample interleaved images are not supported.\n"); av_free(state); av_free(zero); return -1; } if(shift){ /* we need to do point transform or normalize samples */ int x, w; w = s->width * s->nb_components; if(s->bits <= 8){ uint8_t *src = s->picture.data[0]; for(i = 0; i < s->height; i++){ for(x = off; x < w; x+= stride){ src[x] <<= shift; } src += s->picture.linesize[0]; } }else{ uint16_t *src = (uint16_t*) s->picture.data[0]; for(i = 0; i < s->height; i++){ for(x = 0; x < w; x++){ src[x] <<= shift; } src += s->picture.linesize[0]/2; } } } av_free(state); av_free(zero); return 0; }