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 "internal.h"
25 #include "pnm.h"
26 
27 
28 static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
29  const AVFrame *pict, int *got_packet)
30 {
31  PNMContext *s = avctx->priv_data;
32  AVFrame * const p = &s->picture;
33  int i, h, h1, c, n, linesize, ret;
34  uint8_t *ptr, *ptr1, *ptr2;
35 
36  if ((ret = ff_alloc_packet(pkt, avpicture_get_size(avctx->pix_fmt,
37  avctx->width,
38  avctx->height) + 200)) < 0) {
39  av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
40  return ret;
41  }
42 
43  *p = *pict;
45  p->key_frame = 1;
46 
47  s->bytestream_start =
48  s->bytestream = pkt->data;
49  s->bytestream_end = pkt->data + pkt->size;
50 
51  h = avctx->height;
52  h1 = h;
53  switch (avctx->pix_fmt) {
55  c = '4';
56  n = (avctx->width + 7) >> 3;
57  break;
58  case AV_PIX_FMT_GRAY8:
59  c = '5';
60  n = avctx->width;
61  break;
63  c = '5';
64  n = avctx->width * 2;
65  break;
66  case AV_PIX_FMT_RGB24:
67  c = '6';
68  n = avctx->width * 3;
69  break;
70  case AV_PIX_FMT_RGB48BE:
71  c = '6';
72  n = avctx->width * 6;
73  break;
74  case AV_PIX_FMT_YUV420P:
75  c = '5';
76  n = avctx->width;
77  h1 = (h * 3) / 2;
78  break;
79  default:
80  return -1;
81  }
82  snprintf(s->bytestream, s->bytestream_end - s->bytestream,
83  "P%c\n%d %d\n", c, avctx->width, h1);
84  s->bytestream += strlen(s->bytestream);
85  if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
86  snprintf(s->bytestream, s->bytestream_end - s->bytestream,
87  "%d\n", (avctx->pix_fmt != AV_PIX_FMT_GRAY16BE && avctx->pix_fmt != AV_PIX_FMT_RGB48BE) ? 255 : 65535);
88  s->bytestream += strlen(s->bytestream);
89  }
90 
91  ptr = p->data[0];
92  linesize = p->linesize[0];
93  for (i = 0; i < h; i++) {
94  memcpy(s->bytestream, ptr, n);
95  s->bytestream += n;
96  ptr += linesize;
97  }
98 
99  if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
100  h >>= 1;
101  n >>= 1;
102  ptr1 = p->data[1];
103  ptr2 = p->data[2];
104  for (i = 0; i < h; i++) {
105  memcpy(s->bytestream, ptr1, n);
106  s->bytestream += n;
107  memcpy(s->bytestream, ptr2, n);
108  s->bytestream += n;
109  ptr1 += p->linesize[1];
110  ptr2 += p->linesize[2];
111  }
112  }
113  pkt->size = s->bytestream - s->bytestream_start;
114  pkt->flags |= AV_PKT_FLAG_KEY;
115  *got_packet = 1;
116 
117  return 0;
118 }
119 
120 
121 #if CONFIG_PGM_ENCODER
122 AVCodec ff_pgm_encoder = {
123  .name = "pgm",
124  .type = AVMEDIA_TYPE_VIDEO,
125  .id = AV_CODEC_ID_PGM,
126  .priv_data_size = sizeof(PNMContext),
127  .init = ff_pnm_init,
128  .encode2 = pnm_encode_frame,
129  .pix_fmts = (const enum AVPixelFormat[]){
131  },
132  .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
133 };
134 #endif
135 
136 #if CONFIG_PGMYUV_ENCODER
137 AVCodec ff_pgmyuv_encoder = {
138  .name = "pgmyuv",
139  .type = AVMEDIA_TYPE_VIDEO,
140  .id = AV_CODEC_ID_PGMYUV,
141  .priv_data_size = sizeof(PNMContext),
142  .init = ff_pnm_init,
143  .encode2 = pnm_encode_frame,
144  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
145  .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
146 };
147 #endif
148 
149 #if CONFIG_PPM_ENCODER
150 AVCodec ff_ppm_encoder = {
151  .name = "ppm",
152  .type = AVMEDIA_TYPE_VIDEO,
153  .id = AV_CODEC_ID_PPM,
154  .priv_data_size = sizeof(PNMContext),
155  .init = ff_pnm_init,
156  .encode2 = pnm_encode_frame,
157  .pix_fmts = (const enum AVPixelFormat[]){
159  },
160  .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
161 };
162 #endif
163 
164 #if CONFIG_PBM_ENCODER
165 AVCodec ff_pbm_encoder = {
166  .name = "pbm",
167  .type = AVMEDIA_TYPE_VIDEO,
168  .id = AV_CODEC_ID_PBM,
169  .priv_data_size = sizeof(PNMContext),
170  .init = ff_pnm_init,
171  .encode2 = pnm_encode_frame,
172  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
173  AV_PIX_FMT_NONE },
174  .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
175 };
176 #endif