pamenc.c
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1 /*
2  * PAM image format
3  * Copyright (c) 2002, 2003 Fabrice Bellard
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 "avcodec.h"
23 #include "bytestream.h"
24 #include "pnm.h"
25 
26 
27 static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,
28  int buf_size, void *data)
29 {
30  PNMContext *s = avctx->priv_data;
31  AVFrame *pict = data;
32  AVFrame * const p = (AVFrame*)&s->picture;
33  int i, h, w, n, linesize, depth, maxval;
34  const char *tuple_type;
35  uint8_t *ptr;
36 
37  if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {
38  av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
39  return -1;
40  }
41 
42  *p = *pict;
44  p->key_frame = 1;
45 
46  s->bytestream_start =
47  s->bytestream = outbuf;
48  s->bytestream_end = outbuf+buf_size;
49 
50  h = avctx->height;
51  w = avctx->width;
52  switch (avctx->pix_fmt) {
53  case PIX_FMT_MONOWHITE:
54  n = (w + 7) >> 3;
55  depth = 1;
56  maxval = 1;
57  tuple_type = "BLACKANDWHITE";
58  break;
59  case PIX_FMT_GRAY8:
60  n = w;
61  depth = 1;
62  maxval = 255;
63  tuple_type = "GRAYSCALE";
64  break;
65  case PIX_FMT_RGB24:
66  n = w * 3;
67  depth = 3;
68  maxval = 255;
69  tuple_type = "RGB";
70  break;
71  case PIX_FMT_RGB32:
72  n = w * 4;
73  depth = 4;
74  maxval = 255;
75  tuple_type = "RGB_ALPHA";
76  break;
77  default:
78  return -1;
79  }
80  snprintf(s->bytestream, s->bytestream_end - s->bytestream,
81  "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLETYPE %s\nENDHDR\n",
82  w, h, depth, maxval, tuple_type);
83  s->bytestream += strlen(s->bytestream);
84 
85  ptr = p->data[0];
86  linesize = p->linesize[0];
87 
88  if (avctx->pix_fmt == PIX_FMT_RGB32) {
89  int j;
90  unsigned int v;
91 
92  for (i = 0; i < h; i++) {
93  for (j = 0; j < w; j++) {
94  v = ((uint32_t *)ptr)[j];
95  bytestream_put_be24(&s->bytestream, v);
96  *s->bytestream++ = v >> 24;
97  }
98  ptr += linesize;
99  }
100  } else {
101  for (i = 0; i < h; i++) {
102  memcpy(s->bytestream, ptr, n);
103  s->bytestream += n;
104  ptr += linesize;
105  }
106  }
107  return s->bytestream - s->bytestream_start;
108 }
109 
110 
112  .name = "pam",
113  .type = AVMEDIA_TYPE_VIDEO,
114  .id = CODEC_ID_PAM,
115  .priv_data_size = sizeof(PNMContext),
116  .init = ff_pnm_init,
117  .encode = pam_encode_frame,
119  .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
120 };