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 "codec_internal.h" 25#include "internal.h" 26#include "libavutil/intreadwrite.h" 27 28static av_cold int zero12v_decode_init(AVCodecContext *avctx) 29{ 30 avctx->pix_fmt = AV_PIX_FMT_YUV422P16; 31 avctx->bits_per_raw_sample = 10; 32 33 if (avctx->codec_tag == MKTAG('a', '1', '2', 'v')) 34 avpriv_request_sample(avctx, "transparency"); 35 36 return 0; 37} 38 39static int zero12v_decode_frame(AVCodecContext *avctx, AVFrame *pic, 40 int *got_frame, AVPacket *avpkt) 41{ 42 int line, ret; 43 const int width = avctx->width; 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 147const FFCodec ff_zero12v_decoder = { 148 .p.name = "012v", 149 .p.long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"), 150 .p.type = AVMEDIA_TYPE_VIDEO, 151 .p.id = AV_CODEC_ID_012V, 152 .init = zero12v_decode_init, 153 FF_CODEC_DECODE_CB(zero12v_decode_frame), 154 .p.capabilities = AV_CODEC_CAP_DR1, 155 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 156}; 157