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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 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 "avcodec.h"
23 #include "internal.h"
24 #include "pnm.h"
25 
26 
28  const AVFrame *pict, int *got_packet)
29 {
30  PNMContext *s = avctx->priv_data;
31  AVFrame * const p = &s->picture;
32  int i, h, w, n, linesize, depth, maxval, ret;
33  const char *tuple_type;
34  uint8_t *ptr;
35 
36  h = avctx->height;
37  w = avctx->width;
38  switch (avctx->pix_fmt) {
40  n = w;
41  depth = 1;
42  maxval = 1;
43  tuple_type = "BLACKANDWHITE";
44  break;
45  case AV_PIX_FMT_GRAY8:
46  n = w;
47  depth = 1;
48  maxval = 255;
49  tuple_type = "GRAYSCALE";
50  break;
52  n = w * 2;
53  depth = 1;
54  maxval = 0xFFFF;
55  tuple_type = "GRAYSCALE";
56  break;
57  case AV_PIX_FMT_GRAY8A:
58  n = w * 2;
59  depth = 2;
60  maxval = 255;
61  tuple_type = "GRAYSCALE_ALPHA";
62  break;
63  case AV_PIX_FMT_RGB24:
64  n = w * 3;
65  depth = 3;
66  maxval = 255;
67  tuple_type = "RGB";
68  break;
69  case AV_PIX_FMT_RGBA:
70  n = w * 4;
71  depth = 4;
72  maxval = 255;
73  tuple_type = "RGB_ALPHA";
74  break;
75  case AV_PIX_FMT_RGB48BE:
76  n = w * 6;
77  depth = 3;
78  maxval = 0xFFFF;
79  tuple_type = "RGB";
80  break;
82  n = w * 8;
83  depth = 4;
84  maxval = 0xFFFF;
85  tuple_type = "RGB_ALPHA";
86  break;
87  default:
88  return -1;
89  }
90 
91  if ((ret = ff_alloc_packet2(avctx, pkt, n*h + 200)) < 0)
92  return ret;
93 
94  *p = *pict;
96  p->key_frame = 1;
97 
98  s->bytestream_start =
99  s->bytestream = pkt->data;
100  s->bytestream_end = pkt->data + pkt->size;
101 
103  "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
104  w, h, depth, maxval, tuple_type);
105  s->bytestream += strlen(s->bytestream);
106 
107  ptr = p->data[0];
108  linesize = p->linesize[0];
109 
110  if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK){
111  int j;
112  for (i = 0; i < h; i++) {
113  for (j = 0; j < w; j++)
114  *s->bytestream++ = ptr[j >> 3] >> (7 - j & 7) & 1;
115  ptr += linesize;
116  }
117  } else {
118  for (i = 0; i < h; i++) {
119  memcpy(s->bytestream, ptr, n);
120  s->bytestream += n;
121  ptr += linesize;
122  }
123  }
124 
125  pkt->size = s->bytestream - s->bytestream_start;
126  pkt->flags |= AV_PKT_FLAG_KEY;
127  *got_packet = 1;
128  return 0;
129 }
130 
131 
133  .name = "pam",
134  .type = AVMEDIA_TYPE_VIDEO,
135  .id = AV_CODEC_ID_PAM,
136  .priv_data_size = sizeof(PNMContext),
137  .init = ff_pnm_init,
138  .encode2 = pam_encode_frame,
139  .pix_fmts = (const enum AVPixelFormat[]){
141  },
142  .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
143 };