| 659 | } |
| 660 | |
| 661 | static int decode_header(AVCodecContext *avctx, RangeCoder *c, |
| 662 | uint8_t *buf, size_t buf_size) |
| 663 | { |
| 664 | int ret; |
| 665 | FFV1Context *f = avctx->priv_data; |
| 666 | |
| 667 | uint8_t keystate = 128; |
| 668 | ff_init_range_decoder(c, buf, buf_size); |
| 669 | ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8); |
| 670 | |
| 671 | if (get_rac(c, &keystate)) { |
| 672 | f->key_frame = AV_FRAME_FLAG_KEY; |
| 673 | f->key_frame_ok = 0; |
| 674 | if ((ret = read_header(f, c)) < 0) |
| 675 | return ret; |
| 676 | f->key_frame_ok = 1; |
| 677 | } else { |
| 678 | if (!f->key_frame_ok) { |
| 679 | av_log(avctx, AV_LOG_ERROR, |
| 680 | "Cannot decode non-keyframe without valid keyframe\n"); |
| 681 | return AVERROR_INVALIDDATA; |
| 682 | } |
| 683 | f->key_frame = 0; |
| 684 | } |
| 685 | |
| 686 | if (f->ac != AC_GOLOMB_RICE) { |
| 687 | if (buf_size < avctx->width * avctx->height / (128*8)) |
| 688 | return AVERROR_INVALIDDATA; |
| 689 | } else { |
| 690 | int w = avctx->width; |
| 691 | int s = 1 + w / (1<<23); |
| 692 | int i; |
| 693 | |
| 694 | w /= s; |
| 695 | |
| 696 | for (i = 0; w > (1<<ff_log2_run[i]); i++) |
| 697 | w -= ff_log2_run[i]; |
| 698 | if (buf_size < (avctx->height + i + 6) / 8 * s) |
| 699 | return AVERROR_INVALIDDATA; |
| 700 | } |
| 701 | |
| 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | static int decode_slices(AVCodecContext *avctx, RangeCoder c, |
| 706 | AVPacket *avpkt) |
no test coverage detected