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dpxenc.c
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1 /*
2  * DPX (.dpx) image encoder
3  * Copyright (c) 2011 Peter Ross <pross@xvid.org>
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 #include "libavutil/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/imgutils.h"
25 #include "avcodec.h"
26 #include "internal.h"
27 
28 typedef struct DPXContext {
33  int planar;
34 } DPXContext;
35 
37 {
38  DPXContext *s = avctx->priv_data;
39  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
40 
41  s->big_endian = !!(desc->flags & AV_PIX_FMT_FLAG_BE);
42  s->bits_per_component = desc->comp[0].depth_minus1 + 1;
43  s->num_components = desc->nb_components;
44  s->descriptor = (desc->flags & AV_PIX_FMT_FLAG_ALPHA) ? 51 : 50;
45  s->planar = !!(desc->flags & AV_PIX_FMT_FLAG_PLANAR);
46 
47  switch (avctx->pix_fmt) {
48  case AV_PIX_FMT_ABGR:
49  s->descriptor = 52;
50  break;
53  case AV_PIX_FMT_GRAY8:
54  s->descriptor = 6;
55  break;
60  case AV_PIX_FMT_RGB24:
63  case AV_PIX_FMT_RGBA:
64  break;
65  case AV_PIX_FMT_RGB48LE:
66  case AV_PIX_FMT_RGB48BE:
67  if (avctx->bits_per_raw_sample)
69  break;
70  default:
71  av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
72  return -1;
73  }
74 
75  return 0;
76 }
77 
78 #define write16(p, value) \
79 do { \
80  if (s->big_endian) AV_WB16(p, value); \
81  else AV_WL16(p, value); \
82 } while(0)
83 
84 #define write32(p, value) \
85 do { \
86  if (s->big_endian) AV_WB32(p, value); \
87  else AV_WL32(p, value); \
88 } while(0)
89 
90 static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic, uint8_t *dst)
91 {
92  DPXContext *s = avctx->priv_data;
93  const uint8_t *src = pic->data[0];
94  int x, y;
95 
96  for (y = 0; y < avctx->height; y++) {
97  for (x = 0; x < avctx->width; x++) {
98  int value;
99  if (s->big_endian) {
100  value = ((AV_RB16(src + 6*x + 4) & 0xFFC0U) >> 4)
101  | ((AV_RB16(src + 6*x + 2) & 0xFFC0U) << 6)
102  | ((AV_RB16(src + 6*x + 0) & 0xFFC0U) << 16);
103  } else {
104  value = ((AV_RL16(src + 6*x + 4) & 0xFFC0U) >> 4)
105  | ((AV_RL16(src + 6*x + 2) & 0xFFC0U) << 6)
106  | ((AV_RL16(src + 6*x + 0) & 0xFFC0U) << 16);
107  }
108  write32(dst, value);
109  dst += 4;
110  }
111  src += pic->linesize[0];
112  }
113 }
114 
115 static void encode_gbrp10(AVCodecContext *avctx, const AVPicture *pic, uint8_t *dst)
116 {
117  DPXContext *s = avctx->priv_data;
118  const uint8_t *src[3] = {pic->data[0], pic->data[1], pic->data[2]};
119  int x, y, i;
120 
121  for (y = 0; y < avctx->height; y++) {
122  for (x = 0; x < avctx->width; x++) {
123  int value;
124  if (s->big_endian) {
125  value = (AV_RB16(src[0] + 2*x) << 12)
126  | (AV_RB16(src[1] + 2*x) << 2)
127  | ((unsigned)AV_RB16(src[2] + 2*x) << 22);
128  } else {
129  value = (AV_RL16(src[0] + 2*x) << 12)
130  | (AV_RL16(src[1] + 2*x) << 2)
131  | ((unsigned)AV_RL16(src[2] + 2*x) << 22);
132  }
133  write32(dst, value);
134  dst += 4;
135  }
136  for (i = 0; i < 3; i++)
137  src[i] += pic->linesize[i];
138  }
139 }
140 
141 static void encode_gbrp12(AVCodecContext *avctx, const AVPicture *pic, uint16_t *dst)
142 {
143  DPXContext *s = avctx->priv_data;
144  const uint16_t *src[3] = {(uint16_t*)pic->data[0],
145  (uint16_t*)pic->data[1],
146  (uint16_t*)pic->data[2]};
147  int x, y, i, pad;
148  pad = avctx->width*6;
149  pad = (FFALIGN(pad, 4) - pad) >> 1;
150  for (y = 0; y < avctx->height; y++) {
151  for (x = 0; x < avctx->width; x++) {
152  uint16_t value[3];
153  if (s->big_endian) {
154  value[1] = AV_RB16(src[0] + x) << 4;
155  value[2] = AV_RB16(src[1] + x) << 4;
156  value[0] = AV_RB16(src[2] + x) << 4;
157  } else {
158  value[1] = AV_RL16(src[0] + x) << 4;
159  value[2] = AV_RL16(src[1] + x) << 4;
160  value[0] = AV_RL16(src[2] + x) << 4;
161  }
162  for (i = 0; i < pad; i++)
163  *dst++ = 0;
164  for (i = 0; i < 3; i++)
165  write16(dst++, value[i]);
166  }
167  for (i = 0; i < 3; i++)
168  src[i] += pic->linesize[i]/2;
169  }
170 }
171 
173  const AVFrame *frame, int *got_packet)
174 {
175  DPXContext *s = avctx->priv_data;
176  int size, ret, need_align, len;
177  uint8_t *buf;
178 
179 #define HEADER_SIZE 1664 /* DPX Generic header */
180  if (s->bits_per_component == 10)
181  size = avctx->height * avctx->width * 4;
182  else if (s->bits_per_component == 12) {
183  // 3 components, 12 bits put on 16 bits
184  len = avctx->width*6;
185  size = FFALIGN(len, 4);
186  need_align = size - len;
187  size *= avctx->height;
188  } else {
189  // N components, M bits
190  len = avctx->width * s->num_components * s->bits_per_component >> 3;
191  size = FFALIGN(len, 4);
192  need_align = size - len;
193  size *= avctx->height;
194  }
195  if ((ret = ff_alloc_packet2(avctx, pkt, size + HEADER_SIZE)) < 0)
196  return ret;
197  buf = pkt->data;
198 
199  memset(buf, 0, HEADER_SIZE);
200 
201  /* File information header */
202  write32(buf, MKBETAG('S','D','P','X'));
203  write32(buf + 4, HEADER_SIZE);
204  memcpy (buf + 8, "V1.0", 4);
205  write32(buf + 20, 1); /* new image */
206  write32(buf + 24, HEADER_SIZE);
207  if (!(avctx->flags & CODEC_FLAG_BITEXACT))
208  memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
209  write32(buf + 660, 0xFFFFFFFF); /* unencrypted */
210 
211  /* Image information header */
212  write16(buf + 768, 0); /* orientation; left to right, top to bottom */
213  write16(buf + 770, 1); /* number of elements */
214  write32(buf + 772, avctx->width);
215  write32(buf + 776, avctx->height);
216  buf[800] = s->descriptor;
217  buf[801] = 2; /* linear transfer */
218  buf[802] = 2; /* linear colorimetric */
219  buf[803] = s->bits_per_component;
220  write16(buf + 804, (s->bits_per_component == 10 || s->bits_per_component == 12) ?
221  1 : 0); /* packing method */
222  write32(buf + 808, HEADER_SIZE); /* data offset */
223 
224  /* Image source information header */
225  write32(buf + 1628, avctx->sample_aspect_ratio.num);
226  write32(buf + 1632, avctx->sample_aspect_ratio.den);
227 
228  switch(s->bits_per_component) {
229  case 8:
230  case 16:
231  if (need_align) {
232  int j;
233  const uint8_t *src = frame->data[0];
234  uint8_t *dst = pkt->data + HEADER_SIZE;
235  size = (len + need_align) * avctx->height;
236  for (j=0; j<avctx->height; j++) {
237  memcpy(dst, src, len);
238  memset(dst + len, 0, need_align);
239  dst += len + need_align;
240  src += frame->linesize[0];
241  }
242  } else {
243  size = avpicture_layout((const AVPicture*)frame, avctx->pix_fmt,
244  avctx->width, avctx->height,
245  buf + HEADER_SIZE, pkt->size - HEADER_SIZE);
246  }
247  if (size < 0)
248  return size;
249  break;
250  case 10:
251  if (s->planar)
252  encode_gbrp10(avctx, (const AVPicture*)frame, buf + HEADER_SIZE);
253  else
254  encode_rgb48_10bit(avctx, (const AVPicture*)frame, buf + HEADER_SIZE);
255  break;
256  case 12:
257  encode_gbrp12(avctx, (const AVPicture*)frame, (uint16_t*)(buf + HEADER_SIZE));
258  break;
259  default:
260  av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component);
261  return -1;
262  }
263 
264  size += HEADER_SIZE;
265 
266  write32(buf + 16, size); /* file size */
267 
268  pkt->flags |= AV_PKT_FLAG_KEY;
269  *got_packet = 1;
270 
271  return 0;
272 }
273 
275  .name = "dpx",
276  .long_name = NULL_IF_CONFIG_SMALL("DPX (Digital Picture Exchange) image"),
277  .type = AVMEDIA_TYPE_VIDEO,
278  .id = AV_CODEC_ID_DPX,
279  .priv_data_size = sizeof(DPXContext),
280  .init = encode_init,
281  .encode2 = encode_frame,
282  .pix_fmts = (const enum AVPixelFormat[]){
291 };