FFmpeg
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/imgutils.h"
23 #include "libavutil/pixdesc.h"
24 #include "avcodec.h"
25 #include "internal.h"
26 
28  const AVFrame *p, int *got_packet)
29 {
30  uint8_t *bytestream, *bytestream_start, *bytestream_end;
31  int i, h, h1, c, n, linesize, ret;
32  uint8_t *ptr, *ptr1, *ptr2;
34  avctx->width, avctx->height, 1);
35 
36  if ((ret = ff_alloc_packet2(avctx, pkt, size + 200, 0)) < 0)
37  return ret;
38 
39  bytestream_start =
40  bytestream = pkt->data;
41  bytestream_end = pkt->data + pkt->size;
42 
43  h = avctx->height;
44  h1 = h;
45  switch (avctx->pix_fmt) {
47  c = '4';
48  n = (avctx->width + 7) >> 3;
49  break;
50  case AV_PIX_FMT_GRAY8:
51  c = '5';
52  n = avctx->width;
53  break;
55  c = '5';
56  n = avctx->width * 2;
57  break;
58  case AV_PIX_FMT_RGB24:
59  c = '6';
60  n = avctx->width * 3;
61  break;
62  case AV_PIX_FMT_RGB48BE:
63  c = '6';
64  n = avctx->width * 6;
65  break;
66  case AV_PIX_FMT_YUV420P:
67  if (avctx->width & 1 || avctx->height & 1) {
68  av_log(avctx, AV_LOG_ERROR, "pgmyuv needs even width and height\n");
69  return AVERROR(EINVAL);
70  }
71  c = '5';
72  n = avctx->width;
73  h1 = (h * 3) / 2;
74  break;
76  c = '5';
77  n = avctx->width * 2;
78  h1 = (h * 3) / 2;
79  break;
80  default:
81  return -1;
82  }
83  snprintf(bytestream, bytestream_end - bytestream,
84  "P%c\n%d %d\n", c, avctx->width, h1);
85  bytestream += strlen(bytestream);
86  if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
87  int maxdepth = (1 << av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth) - 1;
88  snprintf(bytestream, bytestream_end - bytestream,
89  "%d\n", maxdepth);
90  bytestream += strlen(bytestream);
91  }
92 
93  ptr = p->data[0];
94  linesize = p->linesize[0];
95  for (i = 0; i < h; i++) {
96  memcpy(bytestream, ptr, n);
97  bytestream += n;
98  ptr += linesize;
99  }
100 
101  if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || avctx->pix_fmt == AV_PIX_FMT_YUV420P16BE) {
102  h >>= 1;
103  n >>= 1;
104  ptr1 = p->data[1];
105  ptr2 = p->data[2];
106  for (i = 0; i < h; i++) {
107  memcpy(bytestream, ptr1, n);
108  bytestream += n;
109  memcpy(bytestream, ptr2, n);
110  bytestream += n;
111  ptr1 += p->linesize[1];
112  ptr2 += p->linesize[2];
113  }
114  }
115  pkt->size = bytestream - bytestream_start;
116  pkt->flags |= AV_PKT_FLAG_KEY;
117  *got_packet = 1;
118 
119  return 0;
120 }
121 
123 {
124 #if FF_API_CODED_FRAME
127  avctx->coded_frame->key_frame = 1;
129 #endif
130 
131  return 0;
132 }
133 
134 #if CONFIG_PGM_ENCODER
136  .name = "pgm",
137  .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
138  .type = AVMEDIA_TYPE_VIDEO,
139  .id = AV_CODEC_ID_PGM,
140  .init = pnm_encode_init,
141  .encode2 = pnm_encode_frame,
142  .pix_fmts = (const enum AVPixelFormat[]){
144  },
145 };
146 #endif
147 
148 #if CONFIG_PGMYUV_ENCODER
150  .name = "pgmyuv",
151  .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
152  .type = AVMEDIA_TYPE_VIDEO,
153  .id = AV_CODEC_ID_PGMYUV,
154  .init = pnm_encode_init,
155  .encode2 = pnm_encode_frame,
156  .pix_fmts = (const enum AVPixelFormat[]){
158  },
159 };
160 #endif
161 
162 #if CONFIG_PPM_ENCODER
164  .name = "ppm",
165  .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
166  .type = AVMEDIA_TYPE_VIDEO,
167  .id = AV_CODEC_ID_PPM,
168  .init = pnm_encode_init,
169  .encode2 = pnm_encode_frame,
170  .pix_fmts = (const enum AVPixelFormat[]){
172  },
173 };
174 #endif
175 
176 #if CONFIG_PBM_ENCODER
178  .name = "pbm",
179  .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
180  .type = AVMEDIA_TYPE_VIDEO,
181  .id = AV_CODEC_ID_PBM,
182  .init = pnm_encode_init,
183  .encode2 = pnm_encode_frame,
184  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
185  AV_PIX_FMT_NONE },
186 };
187 #endif
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2522
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
misc image utilities
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
AVCodec ff_pbm_encoder
int size
Definition: avcodec.h:1478
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3481
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
uint8_t
#define av_cold
Definition: attributes.h:82
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodec ff_pgm_encoder
uint8_t * data
Definition: avcodec.h:1477
ptrdiff_t size
Definition: opengl_enc.c:100
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1509
AVCodec ff_ppm_encoder
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters...
Definition: imgutils.c:431
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVCodec ff_pgmyuv_encoder
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static av_cold int pnm_encode_init(AVCodecContext *avctx)
Definition: pnmenc.c:122
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1483
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:378
int width
picture width / height.
Definition: avcodec.h:1738
int n
Definition: avisynth_c.h:760
static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
Definition: pnmenc.c:27
planar YUV 4:2:0, 24bpp, (1 Cr & Cb sample per 2x2 Y samples), big-endian
Definition: pixfmt.h:132
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
main external API structure.
Definition: avcodec.h:1565
Y , 16bpp, big-endian.
Definition: pixfmt.h:97
#define snprintf
Definition: snprintf.h:34
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
Y , 8bpp.
Definition: pixfmt.h:74
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal api header.
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:75
packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big...
Definition: pixfmt.h:102
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2815
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:373
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
int depth
Number of bits in the component.
Definition: pixdesc.h:58
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
This structure stores compressed data.
Definition: avcodec.h:1454