blob: b5a4066656ea93a66e57bdcb27d83acb8b5a5970
| 1 | /* |
| 2 | * 012v decoder |
| 3 | * |
| 4 | * Copyright (C) 2012 Carl Eugen Hoyos |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include "avcodec.h" |
| 24 | #include "internal.h" |
| 25 | #include "libavutil/intreadwrite.h" |
| 26 | |
| 27 | static av_cold int zero12v_decode_init(AVCodecContext *avctx) |
| 28 | { |
| 29 | avctx->pix_fmt = AV_PIX_FMT_YUV422P16; |
| 30 | avctx->bits_per_raw_sample = 10; |
| 31 | |
| 32 | if (avctx->codec_tag == MKTAG('a', '1', '2', 'v')) |
| 33 | avpriv_request_sample(avctx, "transparency"); |
| 34 | |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | static int zero12v_decode_frame(AVCodecContext *avctx, void *data, |
| 39 | int *got_frame, AVPacket *avpkt) |
| 40 | { |
| 41 | int line, ret; |
| 42 | const int width = avctx->width; |
| 43 | AVFrame *pic = data; |
| 44 | uint16_t *y, *u, *v; |
| 45 | const uint8_t *line_end, *src = avpkt->data; |
| 46 | int stride = avctx->width * 8 / 3; |
| 47 | |
| 48 | if (width <= 1 || avctx->height <= 0) { |
| 49 | av_log(avctx, AV_LOG_ERROR, "Dimensions %dx%d not supported.\n", width, avctx->height); |
| 50 | return AVERROR_INVALIDDATA; |
| 51 | } |
| 52 | |
| 53 | if ( avctx->codec_tag == MKTAG('0', '1', '2', 'v') |
| 54 | && avpkt->size % avctx->height == 0 |
| 55 | && avpkt->size / avctx->height * 3 >= width * 8) |
| 56 | stride = avpkt->size / avctx->height; |
| 57 | |
| 58 | if (avpkt->size < avctx->height * stride) { |
| 59 | av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n", |
| 60 | avpkt->size, avctx->height * stride); |
| 61 | return AVERROR_INVALIDDATA; |
| 62 | } |
| 63 | |
| 64 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
| 65 | return ret; |
| 66 | |
| 67 | pic->pict_type = AV_PICTURE_TYPE_I; |
| 68 | pic->key_frame = 1; |
| 69 | |
| 70 | line_end = avpkt->data + stride; |
| 71 | for (line = 0; line < avctx->height; line++) { |
| 72 | uint16_t y_temp[6] = {0x8000, 0x8000, 0x8000, 0x8000, 0x8000, 0x8000}; |
| 73 | uint16_t u_temp[3] = {0x8000, 0x8000, 0x8000}; |
| 74 | uint16_t v_temp[3] = {0x8000, 0x8000, 0x8000}; |
| 75 | int x; |
| 76 | y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); |
| 77 | u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); |
| 78 | v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); |
| 79 | |
| 80 | for (x = 0; x < width; x += 6) { |
| 81 | uint32_t t; |
| 82 | |
| 83 | if (width - x < 6 || line_end - src < 16) { |
| 84 | y = y_temp; |
| 85 | u = u_temp; |
| 86 | v = v_temp; |
| 87 | } |
| 88 | |
| 89 | if (line_end - src < 4) |
| 90 | break; |
| 91 | |
| 92 | t = AV_RL32(src); |
| 93 | src += 4; |
| 94 | *u++ = t << 6 & 0xFFC0; |
| 95 | *y++ = t >> 4 & 0xFFC0; |
| 96 | *v++ = t >> 14 & 0xFFC0; |
| 97 | |
| 98 | if (line_end - src < 4) |
| 99 | break; |
| 100 | |
| 101 | t = AV_RL32(src); |
| 102 | src += 4; |
| 103 | *y++ = t << 6 & 0xFFC0; |
| 104 | *u++ = t >> 4 & 0xFFC0; |
| 105 | *y++ = t >> 14 & 0xFFC0; |
| 106 | |
| 107 | if (line_end - src < 4) |
| 108 | break; |
| 109 | |
| 110 | t = AV_RL32(src); |
| 111 | src += 4; |
| 112 | *v++ = t << 6 & 0xFFC0; |
| 113 | *y++ = t >> 4 & 0xFFC0; |
| 114 | *u++ = t >> 14 & 0xFFC0; |
| 115 | |
| 116 | if (line_end - src < 4) |
| 117 | break; |
| 118 | |
| 119 | t = AV_RL32(src); |
| 120 | src += 4; |
| 121 | *y++ = t << 6 & 0xFFC0; |
| 122 | *v++ = t >> 4 & 0xFFC0; |
| 123 | *y++ = t >> 14 & 0xFFC0; |
| 124 | |
| 125 | if (width - x < 6) |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | if (x < width) { |
| 130 | y = x + (uint16_t *)(pic->data[0] + line * pic->linesize[0]); |
| 131 | u = x/2 + (uint16_t *)(pic->data[1] + line * pic->linesize[1]); |
| 132 | v = x/2 + (uint16_t *)(pic->data[2] + line * pic->linesize[2]); |
| 133 | memcpy(y, y_temp, sizeof(*y) * (width - x)); |
| 134 | memcpy(u, u_temp, sizeof(*u) * (width - x + 1) / 2); |
| 135 | memcpy(v, v_temp, sizeof(*v) * (width - x + 1) / 2); |
| 136 | } |
| 137 | |
| 138 | line_end += stride; |
| 139 | src = line_end - stride; |
| 140 | } |
| 141 | |
| 142 | *got_frame = 1; |
| 143 | |
| 144 | return avpkt->size; |
| 145 | } |
| 146 | |
| 147 | AVCodec ff_zero12v_decoder = { |
| 148 | .name = "012v", |
| 149 | .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"), |
| 150 | .type = AVMEDIA_TYPE_VIDEO, |
| 151 | .id = AV_CODEC_ID_012V, |
| 152 | .init = zero12v_decode_init, |
| 153 | .decode = zero12v_decode_frame, |
| 154 | .capabilities = AV_CODEC_CAP_DR1, |
| 155 | }; |
| 156 |