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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 
26  const AVFrame *p, int *got_packet)
27 {
28  uint8_t *bytestream_start, *bytestream, *bytestream_end;
29  int i, h, w, n, linesize, depth, maxval, ret;
30  const char *tuple_type;
31  uint8_t *ptr;
32 
33  h = avctx->height;
34  w = avctx->width;
35  switch (avctx->pix_fmt) {
37  n = w;
38  depth = 1;
39  maxval = 1;
40  tuple_type = "BLACKANDWHITE";
41  break;
42  case AV_PIX_FMT_GRAY8:
43  n = w;
44  depth = 1;
45  maxval = 255;
46  tuple_type = "GRAYSCALE";
47  break;
49  n = w * 2;
50  depth = 1;
51  maxval = 0xFFFF;
52  tuple_type = "GRAYSCALE";
53  break;
54  case AV_PIX_FMT_GRAY8A:
55  n = w * 2;
56  depth = 2;
57  maxval = 255;
58  tuple_type = "GRAYSCALE_ALPHA";
59  break;
60  case AV_PIX_FMT_RGB24:
61  n = w * 3;
62  depth = 3;
63  maxval = 255;
64  tuple_type = "RGB";
65  break;
66  case AV_PIX_FMT_RGBA:
67  n = w * 4;
68  depth = 4;
69  maxval = 255;
70  tuple_type = "RGB_ALPHA";
71  break;
72  case AV_PIX_FMT_RGB48BE:
73  n = w * 6;
74  depth = 3;
75  maxval = 0xFFFF;
76  tuple_type = "RGB";
77  break;
79  n = w * 8;
80  depth = 4;
81  maxval = 0xFFFF;
82  tuple_type = "RGB_ALPHA";
83  break;
84  default:
85  return -1;
86  }
87 
88  if ((ret = ff_alloc_packet2(avctx, pkt, n*h + 200)) < 0)
89  return ret;
90 
91  bytestream_start =
92  bytestream = pkt->data;
93  bytestream_end = pkt->data + pkt->size;
94 
95  snprintf(bytestream, bytestream_end - bytestream,
96  "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
97  w, h, depth, maxval, tuple_type);
98  bytestream += strlen(bytestream);
99 
100  ptr = p->data[0];
101  linesize = p->linesize[0];
102 
103  if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK){
104  int j;
105  for (i = 0; i < h; i++) {
106  for (j = 0; j < w; j++)
107  *bytestream++ = ptr[j >> 3] >> (7 - j & 7) & 1;
108  ptr += linesize;
109  }
110  } else {
111  for (i = 0; i < h; i++) {
112  memcpy(bytestream, ptr, n);
113  bytestream += n;
114  ptr += linesize;
115  }
116  }
117 
118  pkt->size = bytestream - bytestream_start;
119  pkt->flags |= AV_PKT_FLAG_KEY;
120  *got_packet = 1;
121  return 0;
122 }
123 
125 {
126  avctx->coded_frame = av_frame_alloc();
127  if (!avctx->coded_frame)
128  return AVERROR(ENOMEM);
129 
131  avctx->coded_frame->key_frame = 1;
132 
133  return 0;
134 }
135 
137 {
138  av_frame_free(&avctx->coded_frame);
139  return 0;
140 }
141 
143  .name = "pam",
144  .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
145  .type = AVMEDIA_TYPE_VIDEO,
146  .id = AV_CODEC_ID_PAM,
147  .init = pam_encode_init,
148  .close = pam_encode_close,
149  .encode2 = pam_encode_frame,
150  .pix_fmts = (const enum AVPixelFormat[]){
152  },
153 };