libavcodec/dpxenc.c

   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 #include "internal.h"
  26
  27 typedef struct DPXContext {
  28     AVFrame picture;
  29     int big_endian;
  30     int bits_per_component;
  31     int descriptor;
  32 } DPXContext;
  33
  34 static av_cold int encode_init(AVCodecContext *avctx)
  35 {
  36     DPXContext *s = avctx->priv_data;
  37
  38     avctx->coded_frame = &s->picture;
  39     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
  40     avctx->coded_frame->key_frame = 1;
  41
  42     s->big_endian         = 1;
  43     s->bits_per_component = 8;
  44     s->descriptor         = 50; /* RGB */
  45
  46     switch (avctx->pix_fmt) {
  47     case PIX_FMT_RGB24:
  48         break;
  49     case PIX_FMT_RGBA:
  50         s->descriptor = 51; /* RGBA */
  51         break;
  52     case PIX_FMT_RGB48LE:
  53         s->big_endian = 0;
  54     case PIX_FMT_RGB48BE:
  55         s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16;
  56         break;
  57     default:
  58         av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
  59         return -1;
  60     }
  61
  62     return 0;
  63 }
  64
  65 #define write16(p, value) \
  66 do { \
  67     if (s->big_endian) AV_WB16(p, value); \
  68     else               AV_WL16(p, value); \
  69 } while(0)
  70
  71 #define write32(p, value) \
  72 do { \
  73     if (s->big_endian) AV_WB32(p, value); \
  74     else               AV_WL32(p, value); \
  75 } while(0)
  76
  77 static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic,
  78                                uint8_t *dst)
  79 {
  80     DPXContext *s = avctx->priv_data;
  81     const uint8_t *src = pic->data[0];
  82     int x, y;
  83
  84     for (y = 0; y < avctx->height; y++) {
  85         for (x = 0; x < avctx->width; x++) {
  86             int value;
  87             if ((avctx->pix_fmt & 1)) {
  88                 value = ((AV_RB16(src + 6*x + 4) & 0xFFC0) >> 4)
  89                       | ((AV_RB16(src + 6*x + 2) & 0xFFC0) << 6)
  90                       | ((AV_RB16(src + 6*x + 0) & 0xFFC0) << 16);
  91             } else {
  92                 value = ((AV_RL16(src + 6*x + 4) & 0xFFC0) >> 4)
  93                       | ((AV_RL16(src + 6*x + 2) & 0xFFC0) << 6)
  94                       | ((AV_RL16(src + 6*x + 0) & 0xFFC0) << 16);
  95             }
  96             write32(dst, value);
  97             dst += 4;
  98         }
  99         src += pic->linesize[0];
 100     }
 101 }
 102
 103 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 104                         const AVFrame *frame, int *got_packet)
 105 {
 106     DPXContext *s = avctx->priv_data;
 107     int size, ret;
 108     uint8_t *buf;
 109
 110 #define HEADER_SIZE 1664  /* DPX Generic header */
 111     if (s->bits_per_component == 10)
 112         size = avctx->height * avctx->width * 4;
 113     else
 114         size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
 115     if ((ret = ff_alloc_packet(pkt, size + HEADER_SIZE)) < 0) {
 116         av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
 117         return ret;
 118     }
 119     buf = pkt->data;
 120
 121     memset(buf, 0, HEADER_SIZE);
 122
 123     /* File information header */
 124     write32(buf,       MKBETAG('S','D','P','X'));
 125     write32(buf +   4, HEADER_SIZE);
 126     memcpy (buf +   8, "V1.0", 4);
 127     write32(buf +  20, 1); /* new image */
 128     write32(buf +  24, HEADER_SIZE);
 129     if (!(avctx->flags & CODEC_FLAG_BITEXACT))
 130         memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
 131     write32(buf + 660, 0xFFFFFFFF); /* unencrypted */
 132
 133     /* Image information header */
 134     write16(buf + 768, 0); /* orientation; left to right, top to bottom */
 135     write16(buf + 770, 1); /* number of elements */
 136     write32(buf + 772, avctx->width);
 137     write32(buf + 776, avctx->height);
 138     buf[800] = s->descriptor;
 139     buf[801] = 2; /* linear transfer */
 140     buf[802] = 2; /* linear colorimetric */
 141     buf[803] = s->bits_per_component;
 142     write16(buf + 804, s->bits_per_component == 10 ? 1 : 0); /* packing method */
 143
 144     /* Image source information header */
 145     write32(buf + 1628, avctx->sample_aspect_ratio.num);
 146     write32(buf + 1632, avctx->sample_aspect_ratio.den);
 147
 148     switch (s->bits_per_component) {
 149     case 8:
 150     case 16:
 151         size = avpicture_layout((const AVPicture*)frame, avctx->pix_fmt,
 152                                 avctx->width, avctx->height,
 153                                 buf + HEADER_SIZE, pkt->size - HEADER_SIZE);
 154         if (size < 0)
 155             return size;
 156         break;
 157     case 10:
 158         encode_rgb48_10bit(avctx, (const AVPicture*)frame, buf + HEADER_SIZE);
 159         break;
 160     default:
 161         av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component);
 162         return -1;
 163     }
 164
 165     size += HEADER_SIZE;
 166
 167     write32(buf + 16, size); /* file size */
 168
 169     pkt->flags |= AV_PKT_FLAG_KEY;
 170     *got_packet = 1;
 171
 172     return 0;
 173 }
 174
 175 AVCodec ff_dpx_encoder = {
 176     .name = "dpx",
 177     .type = AVMEDIA_TYPE_VIDEO,
 178     .id   = CODEC_ID_DPX,
 179     .priv_data_size = sizeof(DPXContext),
 180     .init   = encode_init,
 181     .encode2 = encode_frame,
 182     .pix_fmts = (const enum PixelFormat[]){
 183         PIX_FMT_RGB24,
 184         PIX_FMT_RGBA,
 185         PIX_FMT_RGB48LE,
 186         PIX_FMT_RGB48BE,
 187         PIX_FMT_NONE},
 188     .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
 189 };