| 1 | /* |
| 2 | * ATI VCR1 codec |
| 3 | * Copyright (c) 2003 Michael Niedermayer |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * ATI VCR1 codec |
| 25 | */ |
| 26 | |
| 27 | #include "avcodec.h" |
| 28 | #include "internal.h" |
| 29 | #include "libavutil/avassert.h" |
| 30 | #include "libavutil/internal.h" |
| 31 | |
| 32 | typedef struct VCR1Context { |
| 33 | int delta[16]; |
| 34 | int offset[4]; |
| 35 | } VCR1Context; |
| 36 | |
| 37 | static av_cold int vcr1_decode_init(AVCodecContext *avctx) |
| 38 | { |
| 39 | avctx->pix_fmt = AV_PIX_FMT_YUV410P; |
| 40 | |
| 41 | if (avctx->width % 8 || avctx->height%4) { |
| 42 | avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height); |
| 43 | return AVERROR_INVALIDDATA; |
| 44 | } |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | static int vcr1_decode_frame(AVCodecContext *avctx, void *data, |
| 50 | int *got_frame, AVPacket *avpkt) |
| 51 | { |
| 52 | VCR1Context *const a = avctx->priv_data; |
| 53 | AVFrame *const p = data; |
| 54 | const uint8_t *bytestream = avpkt->data; |
| 55 | const uint8_t *bytestream_end = bytestream + avpkt->size; |
| 56 | int i, x, y, ret; |
| 57 | |
| 58 | if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){ |
| 59 | av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size , 32 + avctx->height + avctx->width*avctx->height*5/8); |
| 60 | return AVERROR(EINVAL); |
| 61 | } |
| 62 | |
| 63 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 64 | return ret; |
| 65 | p->pict_type = AV_PICTURE_TYPE_I; |
| 66 | p->key_frame = 1; |
| 67 | |
| 68 | for (i = 0; i < 16; i++) { |
| 69 | a->delta[i] = *bytestream++; |
| 70 | bytestream++; |
| 71 | } |
| 72 | |
| 73 | for (y = 0; y < avctx->height; y++) { |
| 74 | int offset; |
| 75 | uint8_t *luma = &p->data[0][y * p->linesize[0]]; |
| 76 | |
| 77 | if ((y & 3) == 0) { |
| 78 | uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]]; |
| 79 | uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]]; |
| 80 | |
| 81 | av_assert0 (bytestream_end - bytestream >= 4 + avctx->width); |
| 82 | |
| 83 | for (i = 0; i < 4; i++) |
| 84 | a->offset[i] = *bytestream++; |
| 85 | |
| 86 | offset = a->offset[0] - a->delta[bytestream[2] & 0xF]; |
| 87 | for (x = 0; x < avctx->width; x += 4) { |
| 88 | luma[0] = offset += a->delta[bytestream[2] & 0xF]; |
| 89 | luma[1] = offset += a->delta[bytestream[2] >> 4]; |
| 90 | luma[2] = offset += a->delta[bytestream[0] & 0xF]; |
| 91 | luma[3] = offset += a->delta[bytestream[0] >> 4]; |
| 92 | luma += 4; |
| 93 | |
| 94 | *cb++ = bytestream[3]; |
| 95 | *cr++ = bytestream[1]; |
| 96 | |
| 97 | bytestream += 4; |
| 98 | } |
| 99 | } else { |
| 100 | av_assert0 (bytestream_end - bytestream >= avctx->width / 2); |
| 101 | |
| 102 | offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF]; |
| 103 | |
| 104 | for (x = 0; x < avctx->width; x += 8) { |
| 105 | luma[0] = offset += a->delta[bytestream[2] & 0xF]; |
| 106 | luma[1] = offset += a->delta[bytestream[2] >> 4]; |
| 107 | luma[2] = offset += a->delta[bytestream[3] & 0xF]; |
| 108 | luma[3] = offset += a->delta[bytestream[3] >> 4]; |
| 109 | luma[4] = offset += a->delta[bytestream[0] & 0xF]; |
| 110 | luma[5] = offset += a->delta[bytestream[0] >> 4]; |
| 111 | luma[6] = offset += a->delta[bytestream[1] & 0xF]; |
| 112 | luma[7] = offset += a->delta[bytestream[1] >> 4]; |
| 113 | luma += 8; |
| 114 | bytestream += 4; |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | *got_frame = 1; |
| 120 | |
| 121 | return bytestream - avpkt->data; |
| 122 | } |
| 123 | |
| 124 | AVCodec ff_vcr1_decoder = { |
| 125 | .name = "vcr1", |
| 126 | .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"), |
| 127 | .type = AVMEDIA_TYPE_VIDEO, |
| 128 | .id = AV_CODEC_ID_VCR1, |
| 129 | .priv_data_size = sizeof(VCR1Context), |
| 130 | .init = vcr1_decode_init, |
| 131 | .decode = vcr1_decode_frame, |
| 132 | .capabilities = CODEC_CAP_DR1, |
| 133 | }; |