1/* 2 * DPX (.dpx) image encoder 3 * Copyright (c) 2011 Peter Ross <pross@xvid.org> 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/intreadwrite.h" 23#include "libavutil/imgutils.h" 24#include "avcodec.h" 25 26typedef struct DPXContext { 27 AVFrame picture; 28 int big_endian; 29 int bits_per_component; 30 int descriptor; 31} DPXContext; 32 33static av_cold int encode_init(AVCodecContext *avctx) 34{ 35 DPXContext *s = avctx->priv_data; 36 37 avctx->coded_frame = &s->picture; 38 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; 39 avctx->coded_frame->key_frame = 1; 40 41 s->big_endian = 1; 42 s->bits_per_component = 8; 43 s->descriptor = 50; /* RGB */ 44 45 switch (avctx->pix_fmt) { 46 case PIX_FMT_RGB24: 47 break; 48 case PIX_FMT_RGBA: 49 s->descriptor = 51; /* RGBA */ 50 break; 51 case PIX_FMT_RGB48LE: 52 s->big_endian = 0; 53 case PIX_FMT_RGB48BE: 54 s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16; 55 break; 56 default: 57 av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n"); 58 return -1; 59 } 60 61 return 0; 62} 63 64#define write16(p, value) \ 65do { \ 66 if (s->big_endian) AV_WB16(p, value); \ 67 else AV_WL16(p, value); \ 68} while(0) 69 70#define write32(p, value) \ 71do { \ 72 if (s->big_endian) AV_WB32(p, value); \ 73 else AV_WL32(p, value); \ 74} while(0) 75 76static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic, 77 uint8_t *dst) 78{ 79 DPXContext *s = avctx->priv_data; 80 const uint8_t *src = pic->data[0]; 81 int x, y; 82 83 for (y = 0; y < avctx->height; y++) { 84 for (x = 0; x < avctx->width; x++) { 85 int value; 86 if ((avctx->pix_fmt & 1)) { 87 value = ((AV_RB16(src + 6*x + 4) & 0xFFC0) >> 4) 88 | ((AV_RB16(src + 6*x + 2) & 0xFFC0) << 6) 89 | ((AV_RB16(src + 6*x + 0) & 0xFFC0) << 16); 90 } else { 91 value = ((AV_RL16(src + 6*x + 4) & 0xFFC0) >> 4) 92 | ((AV_RL16(src + 6*x + 2) & 0xFFC0) << 6) 93 | ((AV_RL16(src + 6*x + 0) & 0xFFC0) << 16); 94 } 95 write32(dst, value); 96 dst += 4; 97 } 98 src += pic->linesize[0]; 99 } 100} 101 102static int encode_frame(AVCodecContext *avctx, unsigned char *buf, 103 int buf_size, void *data) 104{ 105 DPXContext *s = avctx->priv_data; 106 int size; 107 108#define HEADER_SIZE 1664 /* DPX Generic header */ 109 if (buf_size < HEADER_SIZE) 110 return -1; 111 112 memset(buf, 0, HEADER_SIZE); 113 114 /* File information header */ 115 write32(buf, MKBETAG('S','D','P','X')); 116 write32(buf + 4, HEADER_SIZE); 117 memcpy (buf + 8, "V1.0", 4); 118 write32(buf + 20, 1); /* new image */ 119 write32(buf + 24, HEADER_SIZE); 120 memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100)); 121 write32(buf + 660, 0xFFFFFFFF); /* unencrypted */ 122 123 /* Image information header */ 124 write16(buf + 768, 0); /* orientation; left to right, top to bottom */ 125 write16(buf + 770, 1); /* number of elements */ 126 write32(buf + 772, avctx->width); 127 write32(buf + 776, avctx->height); 128 buf[800] = s->descriptor; 129 buf[801] = 2; /* linear transfer */ 130 buf[802] = 2; /* linear colorimetric */ 131 buf[803] = s->bits_per_component; 132 write16(buf + 804, s->bits_per_component == 10 ? 1 : 0); /* packing method */ 133 134 /* Image source information header */ 135 write32(buf + 1628, avctx->sample_aspect_ratio.num); 136 write32(buf + 1632, avctx->sample_aspect_ratio.den); 137 138 switch (s->bits_per_component) { 139 case 8: 140 case 16: 141 size = avpicture_layout(data, avctx->pix_fmt, 142 avctx->width, avctx->height, 143 buf + HEADER_SIZE, buf_size - HEADER_SIZE); 144 if (size < 0) 145 return size; 146 break; 147 case 10: 148 size = avctx->height * avctx->width * 4; 149 if (buf_size < HEADER_SIZE + size) 150 return -1; 151 encode_rgb48_10bit(avctx, data, buf + HEADER_SIZE); 152 break; 153 default: 154 av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component); 155 return -1; 156 } 157 158 size += HEADER_SIZE; 159 160 write32(buf + 16, size); /* file size */ 161 return size; 162} 163 164AVCodec ff_dpx_encoder = { 165 .name = "dpx", 166 .type = AVMEDIA_TYPE_VIDEO, 167 .id = CODEC_ID_DPX, 168 .priv_data_size = sizeof(DPXContext), 169 .init = encode_init, 170 .encode = encode_frame, 171 .pix_fmts = (const enum PixelFormat[]){ 172 PIX_FMT_RGB24, 173 PIX_FMT_RGBA, 174 PIX_FMT_RGB48LE, 175 PIX_FMT_RGB48BE, 176 PIX_FMT_NONE}, 177 .long_name = NULL_IF_CONFIG_SMALL("DPX image"), 178}; 179