| 48 | } |
| 49 | |
| 50 | static int bfi_decode_frame(AVCodecContext *avctx, AVFrame *frame, |
| 51 | int *got_frame, AVPacket *avpkt) |
| 52 | { |
| 53 | GetByteContext g; |
| 54 | int buf_size = avpkt->size; |
| 55 | BFIContext *bfi = avctx->priv_data; |
| 56 | uint8_t *dst = bfi->dst; |
| 57 | uint8_t *src, *dst_offset, colour1, colour2; |
| 58 | uint8_t *frame_end = bfi->dst + avctx->width * avctx->height; |
| 59 | uint32_t *pal; |
| 60 | int i, j, ret, height = avctx->height; |
| 61 | |
| 62 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 63 | return ret; |
| 64 | |
| 65 | bytestream2_init(&g, avpkt->data, buf_size); |
| 66 | |
| 67 | /* Set frame parameters and palette, if necessary */ |
| 68 | if (!avctx->frame_num) { |
| 69 | frame->pict_type = AV_PICTURE_TYPE_I; |
| 70 | frame->flags |= AV_FRAME_FLAG_KEY; |
| 71 | /* Setting the palette */ |
| 72 | if (avctx->extradata_size > 768) { |
| 73 | av_log(avctx, AV_LOG_ERROR, "Palette is too large.\n"); |
| 74 | return AVERROR_INVALIDDATA; |
| 75 | } |
| 76 | pal = (uint32_t *)frame->data[1]; |
| 77 | for (i = 0; i < avctx->extradata_size / 3; i++) { |
| 78 | int shift = 16; |
| 79 | *pal = 0xFFU << 24; |
| 80 | for (j = 0; j < 3; j++, shift -= 8) |
| 81 | *pal += ((avctx->extradata[i * 3 + j] << 2) | |
| 82 | (avctx->extradata[i * 3 + j] >> 4)) << shift; |
| 83 | pal++; |
| 84 | } |
| 85 | memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal)); |
| 86 | } else { |
| 87 | frame->pict_type = AV_PICTURE_TYPE_P; |
| 88 | frame->flags &= ~AV_FRAME_FLAG_KEY; |
| 89 | memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal)); |
| 90 | } |
| 91 | |
| 92 | bytestream2_skip(&g, 4); // Unpacked size, not required. |
| 93 | |
| 94 | while (dst != frame_end) { |
| 95 | static const uint8_t lentab[4] = { 0, 2, 0, 1 }; |
| 96 | unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset); |
| 97 | unsigned int code = byte >> 6; |
| 98 | unsigned int length = byte & ~0xC0; |
| 99 | |
| 100 | if (!bytestream2_get_bytes_left(&g)) { |
| 101 | av_log(avctx, AV_LOG_ERROR, |
| 102 | "Input resolution larger than actual frame.\n"); |
| 103 | return AVERROR_INVALIDDATA; |
| 104 | } |
| 105 | |
| 106 | /* Get length and offset (if required) */ |
| 107 | if (length == 0) { |
nothing calls this directly
no test coverage detected