static int vp8_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size) { VP56RangeCoder *c = &s->c; int header_size, hscale, vscale, ret; int width = s->avctx->width; int height = s->avctx->height; s->keyframe = !(buf[0] & 1); s->profile = (buf[0]>>1) & 7; s->invisible = !(buf[0] & 0x10); header_size = AV_RL24(buf) >> 5; buf += 3; buf_size -= 3; if (s->profile > 3) av_log(s->avctx, AV_LOG_WARNING, "Unknown profile %d\n", s->profile); if (!s->profile) memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_epel_pixels_tab, sizeof(s->put_pixels_tab)); else // profile 1-3 use bilinear, 4+ aren't defined so whatever memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_bilinear_pixels_tab, sizeof(s->put_pixels_tab)); if (header_size > buf_size - 7 * s->keyframe) { av_log(s->avctx, AV_LOG_ERROR, "Header size larger than data provided\n"); return AVERROR_INVALIDDATA; } if (s->keyframe) { if (AV_RL24(buf) != 0x2a019d) { av_log(s->avctx, AV_LOG_ERROR, "Invalid start code 0x%x\n", AV_RL24(buf)); return AVERROR_INVALIDDATA; } width = AV_RL16(buf + 3) & 0x3fff; height = AV_RL16(buf + 5) & 0x3fff; hscale = buf[4] >> 6; vscale = buf[6] >> 6; buf += 7; buf_size -= 7; if (hscale || vscale) avpriv_request_sample(s->avctx, "Upscaling"); s->update_golden = s->update_altref = VP56_FRAME_CURRENT; vp78_reset_probability_tables(s); memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter, sizeof(s->prob->pred16x16)); memcpy(s->prob->pred8x8c, vp8_pred8x8c_prob_inter, sizeof(s->prob->pred8x8c)); memcpy(s->prob->mvc, vp8_mv_default_prob, sizeof(s->prob->mvc)); memset(&s->segmentation, 0, sizeof(s->segmentation)); memset(&s->lf_delta, 0, sizeof(s->lf_delta)); } ff_vp56_init_range_decoder(c, buf, header_size); buf += header_size; buf_size -= header_size; if (s->keyframe) { if (vp8_rac_get(c)) av_log(s->avctx, AV_LOG_WARNING, "Unspecified colorspace\n"); vp8_rac_get(c); // whether we can skip clamping in dsp functions } if ((s->segmentation.enabled = vp8_rac_get(c))) parse_segment_info(s); else s->segmentation.update_map = 0; // FIXME: move this to some init function? s->filter.simple = vp8_rac_get(c); s->filter.level = vp8_rac_get_uint(c, 6); s->filter.sharpness = vp8_rac_get_uint(c, 3); if ((s->lf_delta.enabled = vp8_rac_get(c))) if (vp8_rac_get(c)) update_lf_deltas(s); if (setup_partitions(s, buf, buf_size)) { av_log(s->avctx, AV_LOG_ERROR, "Invalid partitions\n"); return AVERROR_INVALIDDATA; } if (!s->macroblocks_base || /* first frame */ width != s->avctx->width || height != s->avctx->height) if ((ret = vp8_update_dimensions(s, width, height)) < 0) return ret; get_quants(s); if (!s->keyframe) { update_refs(s); s->sign_bias[VP56_FRAME_GOLDEN] = vp8_rac_get(c); s->sign_bias[VP56_FRAME_GOLDEN2 /* altref */] = vp8_rac_get(c); } // if we aren't saving this frame's probabilities for future frames, // make a copy of the current probabilities if (!(s->update_probabilities = vp8_rac_get(c))) s->prob[1] = s->prob[0]; s->update_last = s->keyframe || vp8_rac_get(c); vp78_update_probability_tables(s); if ((s->mbskip_enabled = vp8_rac_get(c))) s->prob->mbskip = vp8_rac_get_uint(c, 8); if (!s->keyframe) { s->prob->intra = vp8_rac_get_uint(c, 8); s->prob->last = vp8_rac_get_uint(c, 8); s->prob->golden = vp8_rac_get_uint(c, 8); vp78_update_pred16x16_pred8x8_mvc_probabilities(s, VP8_MVC_SIZE); } return 0; }