pnmenc.c
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1 /*
2  * PNM 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 pnm_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, h1, c, n, linesize;
34  uint8_t *ptr, *ptr1, *ptr2;
35 
36  if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {
37  av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
38  return -1;
39  }
40 
41  *p = *pict;
43  p->key_frame = 1;
44 
45  s->bytestream_start =
46  s->bytestream = outbuf;
47  s->bytestream_end = outbuf + buf_size;
48 
49  h = avctx->height;
50  h1 = h;
51  switch (avctx->pix_fmt) {
52  case PIX_FMT_MONOWHITE:
53  c = '4';
54  n = (avctx->width + 7) >> 3;
55  break;
56  case PIX_FMT_GRAY8:
57  c = '5';
58  n = avctx->width;
59  break;
60  case PIX_FMT_GRAY16BE:
61  c = '5';
62  n = avctx->width * 2;
63  break;
64  case PIX_FMT_RGB24:
65  c = '6';
66  n = avctx->width * 3;
67  break;
68  case PIX_FMT_RGB48BE:
69  c = '6';
70  n = avctx->width * 6;
71  break;
72  case PIX_FMT_YUV420P:
73  c = '5';
74  n = avctx->width;
75  h1 = (h * 3) / 2;
76  break;
77  default:
78  return -1;
79  }
80  snprintf(s->bytestream, s->bytestream_end - s->bytestream,
81  "P%c\n%d %d\n", c, avctx->width, h1);
82  s->bytestream += strlen(s->bytestream);
83  if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
84  snprintf(s->bytestream, s->bytestream_end - s->bytestream,
85  "%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE && avctx->pix_fmt != PIX_FMT_RGB48BE) ? 255 : 65535);
86  s->bytestream += strlen(s->bytestream);
87  }
88 
89  ptr = p->data[0];
90  linesize = p->linesize[0];
91  for (i = 0; i < h; i++) {
92  memcpy(s->bytestream, ptr, n);
93  s->bytestream += n;
94  ptr += linesize;
95  }
96 
97  if (avctx->pix_fmt == PIX_FMT_YUV420P) {
98  h >>= 1;
99  n >>= 1;
100  ptr1 = p->data[1];
101  ptr2 = p->data[2];
102  for (i = 0; i < h; i++) {
103  memcpy(s->bytestream, ptr1, n);
104  s->bytestream += n;
105  memcpy(s->bytestream, ptr2, n);
106  s->bytestream += n;
107  ptr1 += p->linesize[1];
108  ptr2 += p->linesize[2];
109  }
110  }
111  return s->bytestream - s->bytestream_start;
112 }
113 
114 
115 #if CONFIG_PGM_ENCODER
116 AVCodec ff_pgm_encoder = {
117  .name = "pgm",
118  .type = AVMEDIA_TYPE_VIDEO,
119  .id = CODEC_ID_PGM,
120  .priv_data_size = sizeof(PNMContext),
121  .init = ff_pnm_init,
122  .encode = pnm_encode_frame,
123  .pix_fmts = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
124  .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
125 };
126 #endif
127 
128 #if CONFIG_PGMYUV_ENCODER
129 AVCodec ff_pgmyuv_encoder = {
130  .name = "pgmyuv",
131  .type = AVMEDIA_TYPE_VIDEO,
132  .id = CODEC_ID_PGMYUV,
133  .priv_data_size = sizeof(PNMContext),
134  .init = ff_pnm_init,
135  .encode = pnm_encode_frame,
136  .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
137  .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
138 };
139 #endif
140 
141 #if CONFIG_PPM_ENCODER
142 AVCodec ff_ppm_encoder = {
143  .name = "ppm",
144  .type = AVMEDIA_TYPE_VIDEO,
145  .id = CODEC_ID_PPM,
146  .priv_data_size = sizeof(PNMContext),
147  .init = ff_pnm_init,
148  .encode = pnm_encode_frame,
149  .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
150  .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
151 };
152 #endif
153 
154 #if CONFIG_PBM_ENCODER
155 AVCodec ff_pbm_encoder = {
156  .name = "pbm",
157  .type = AVMEDIA_TYPE_VIDEO,
158  .id = CODEC_ID_PBM,
159  .priv_data_size = sizeof(PNMContext),
160  .init = ff_pnm_init,
161  .encode = pnm_encode_frame,
162  .pix_fmts = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
163  .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
164 };
165 #endif