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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 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 "libavutil/pixdesc.h"
23 #include "avcodec.h"
24 #include "internal.h"
25 #include "pnm.h"
26 
27 
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_packet2(avctx, pkt, avpicture_get_size(avctx->pix_fmt,
37  avctx->width,
38  avctx->height) + 200)) < 0)
39  return ret;
40 
41  *p = *pict;
43  p->key_frame = 1;
44 
45  s->bytestream_start =
46  s->bytestream = pkt->data;
47  s->bytestream_end = pkt->data + pkt->size;
48 
49  h = avctx->height;
50  h1 = h;
51  switch (avctx->pix_fmt) {
53  c = '4';
54  n = (avctx->width + 7) >> 3;
55  break;
56  case AV_PIX_FMT_GRAY8:
57  c = '5';
58  n = avctx->width;
59  break;
61  c = '5';
62  n = avctx->width * 2;
63  break;
64  case AV_PIX_FMT_RGB24:
65  c = '6';
66  n = avctx->width * 3;
67  break;
68  case AV_PIX_FMT_RGB48BE:
69  c = '6';
70  n = avctx->width * 6;
71  break;
72  case AV_PIX_FMT_YUV420P:
73  if (avctx->width & 1 || avctx->height & 1) {
74  av_log(avctx, AV_LOG_ERROR, "pgmyuv needs even width and height\n");
75  return AVERROR(EINVAL);
76  }
77  c = '5';
78  n = avctx->width;
79  h1 = (h * 3) / 2;
80  break;
82  c = '5';
83  n = avctx->width * 2;
84  h1 = (h * 3) / 2;
85  break;
86  default:
87  return -1;
88  }
90  "P%c\n%d %d\n", c, avctx->width, h1);
91  s->bytestream += strlen(s->bytestream);
92  if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
93  int maxdepth = (1 << (av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth_minus1 + 1)) - 1;
95  "%d\n", maxdepth);
96  s->bytestream += strlen(s->bytestream);
97  }
98 
99  ptr = p->data[0];
100  linesize = p->linesize[0];
101  for (i = 0; i < h; i++) {
102  memcpy(s->bytestream, ptr, n);
103  s->bytestream += n;
104  ptr += linesize;
105  }
106 
107  if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || avctx->pix_fmt == AV_PIX_FMT_YUV420P16BE) {
108  h >>= 1;
109  n >>= 1;
110  ptr1 = p->data[1];
111  ptr2 = p->data[2];
112  for (i = 0; i < h; i++) {
113  memcpy(s->bytestream, ptr1, n);
114  s->bytestream += n;
115  memcpy(s->bytestream, ptr2, n);
116  s->bytestream += n;
117  ptr1 += p->linesize[1];
118  ptr2 += p->linesize[2];
119  }
120  }
121  pkt->size = s->bytestream - s->bytestream_start;
122  pkt->flags |= AV_PKT_FLAG_KEY;
123  *got_packet = 1;
124 
125  return 0;
126 }
127 
128 
129 #if CONFIG_PGM_ENCODER
130 AVCodec ff_pgm_encoder = {
131  .name = "pgm",
132  .type = AVMEDIA_TYPE_VIDEO,
133  .id = AV_CODEC_ID_PGM,
134  .priv_data_size = sizeof(PNMContext),
135  .init = ff_pnm_init,
136  .encode2 = pnm_encode_frame,
137  .pix_fmts = (const enum AVPixelFormat[]){
139  },
140  .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
141 };
142 #endif
143 
144 #if CONFIG_PGMYUV_ENCODER
145 AVCodec ff_pgmyuv_encoder = {
146  .name = "pgmyuv",
147  .type = AVMEDIA_TYPE_VIDEO,
148  .id = AV_CODEC_ID_PGMYUV,
149  .priv_data_size = sizeof(PNMContext),
150  .init = ff_pnm_init,
151  .encode2 = pnm_encode_frame,
152  .pix_fmts = (const enum AVPixelFormat[]){
154  },
155  .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
156 };
157 #endif
158 
159 #if CONFIG_PPM_ENCODER
160 AVCodec ff_ppm_encoder = {
161  .name = "ppm",
162  .type = AVMEDIA_TYPE_VIDEO,
163  .id = AV_CODEC_ID_PPM,
164  .priv_data_size = sizeof(PNMContext),
165  .init = ff_pnm_init,
166  .encode2 = pnm_encode_frame,
167  .pix_fmts = (const enum AVPixelFormat[]){
169  },
170  .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
171 };
172 #endif
173 
174 #if CONFIG_PBM_ENCODER
175 AVCodec ff_pbm_encoder = {
176  .name = "pbm",
177  .type = AVMEDIA_TYPE_VIDEO,
178  .id = AV_CODEC_ID_PBM,
179  .priv_data_size = sizeof(PNMContext),
180  .init = ff_pnm_init,
181  .encode2 = pnm_encode_frame,
182  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
183  AV_PIX_FMT_NONE },
184  .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
185 };
186 #endif