FFmpeg
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img2enc.c
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1 /*
2  * Image format
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  * Copyright (c) 2004 Michael Niedermayer
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/pixdesc.h"
30 #include "avformat.h"
31 #include "avio_internal.h"
32 #include "internal.h"
33 
34 typedef struct {
35  const AVClass *class; /**< Class for private options. */
37  int is_pipe;
38  int split_planes; /**< use independent file for each Y, U, V plane */
39  char path[1024];
40  int update;
42  const char *muxer;
43 } VideoMuxData;
44 
46 {
48  AVStream *st = s->streams[0];
50 
51  av_strlcpy(img->path, s->filename, sizeof(img->path));
52 
53  /* find format */
54  if (s->oformat->flags & AVFMT_NOFILE)
55  img->is_pipe = 0;
56  else
57  img->is_pipe = 1;
58 
59  if (st->codec->codec_id == AV_CODEC_ID_GIF) {
60  img->muxer = "gif";
61  } else if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
62  const char *str = strrchr(img->path, '.');
63  img->split_planes = str
64  && !av_strcasecmp(str + 1, "y")
65  && s->nb_streams == 1
66  && desc
67  &&(desc->flags & AV_PIX_FMT_FLAG_PLANAR)
68  && desc->nb_components >= 3;
69  }
70  return 0;
71 }
72 
74 {
76  AVIOContext *pb[4];
77  char filename[1024];
78  AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
79  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(codec->pix_fmt);
80  int i;
81 
82  if (!img->is_pipe) {
83  if (img->update) {
84  av_strlcpy(filename, img->path, sizeof(filename));
85  } else if (img->use_strftime) {
86  time_t now0;
87  struct tm *tm, tmpbuf;
88  time(&now0);
89  tm = localtime_r(&now0, &tmpbuf);
90  if (!strftime(filename, sizeof(filename), img->path, tm)) {
91  av_log(s, AV_LOG_ERROR, "Could not get frame filename with strftime\n");
92  return AVERROR(EINVAL);
93  }
94  } else if (av_get_frame_filename(filename, sizeof(filename), img->path, img->img_number) < 0 &&
95  img->img_number > 1) {
97  "Could not get frame filename number %d from pattern '%s' (either set updatefirst or use a pattern like %%03d within the filename pattern)\n",
98  img->img_number, img->path);
99  return AVERROR(EINVAL);
100  }
101  for (i = 0; i < 4; i++) {
102  if (avio_open2(&pb[i], filename, AVIO_FLAG_WRITE,
103  &s->interrupt_callback, NULL) < 0) {
104  av_log(s, AV_LOG_ERROR, "Could not open file : %s\n", filename);
105  return AVERROR(EIO);
106  }
107 
108  if (!img->split_planes || i+1 >= desc->nb_components)
109  break;
110  filename[strlen(filename) - 1] = "UVAx"[i];
111  }
112  } else {
113  pb[0] = s->pb;
114  }
115 
116  if (img->split_planes) {
117  int ysize = codec->width * codec->height;
118  int usize = FF_CEIL_RSHIFT(codec->width, desc->log2_chroma_w) * FF_CEIL_RSHIFT(codec->height, desc->log2_chroma_h);
119  if (desc->comp[0].depth_minus1 >= 8) {
120  ysize *= 2;
121  usize *= 2;
122  }
123  avio_write(pb[0], pkt->data , ysize);
124  avio_write(pb[1], pkt->data + ysize , usize);
125  avio_write(pb[2], pkt->data + ysize + usize, usize);
126  avio_closep(&pb[1]);
127  avio_closep(&pb[2]);
128  if (desc->nb_components > 3) {
129  avio_write(pb[3], pkt->data + ysize + 2*usize, ysize);
130  avio_closep(&pb[3]);
131  }
132  } else if (img->muxer) {
133  int ret;
134  AVStream *st;
135  AVPacket pkt2 = {0};
136  AVFormatContext *fmt = NULL;
137 
138  av_assert0(!img->split_planes);
139 
140  ret = avformat_alloc_output_context2(&fmt, NULL, img->muxer, s->filename);
141  if (ret < 0)
142  return ret;
143  st = avformat_new_stream(fmt, NULL);
144  if (!st) {
146  return AVERROR(ENOMEM);
147  }
148  st->id = pkt->stream_index;
149 
150  fmt->pb = pb[0];
151  if ((ret = av_copy_packet(&pkt2, pkt)) < 0 ||
152  (ret = av_dup_packet(&pkt2)) < 0 ||
153  (ret = avcodec_copy_context(st->codec, s->streams[0]->codec)) < 0 ||
154  (ret = avformat_write_header(fmt, NULL)) < 0 ||
155  (ret = av_interleaved_write_frame(fmt, &pkt2)) < 0 ||
156  (ret = av_write_trailer(fmt)) < 0) {
157  av_free_packet(&pkt2);
159  return ret;
160  }
161  av_free_packet(&pkt2);
163  } else {
164  avio_write(pb[0], pkt->data, pkt->size);
165  }
166  avio_flush(pb[0]);
167  if (!img->is_pipe) {
168  avio_closep(&pb[0]);
169  }
170 
171  img->img_number++;
172  return 0;
173 }
174 
175 #define OFFSET(x) offsetof(VideoMuxData, x)
176 #define ENC AV_OPT_FLAG_ENCODING_PARAM
177 static const AVOption muxoptions[] = {
178  { "updatefirst", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
179  { "update", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
180  { "start_number", "set first number in the sequence", OFFSET(img_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, ENC },
181  { "strftime", "use strftime for filename", OFFSET(use_strftime), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
182  { NULL },
183 };
184 
185 #if CONFIG_IMAGE2_MUXER
186 static const AVClass img2mux_class = {
187  .class_name = "image2 muxer",
188  .item_name = av_default_item_name,
189  .option = muxoptions,
190  .version = LIBAVUTIL_VERSION_INT,
191 };
192 
193 AVOutputFormat ff_image2_muxer = {
194  .name = "image2",
195  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
196  .extensions = "bmp,dpx,jls,jpeg,jpg,ljpg,pam,pbm,pcx,pgm,pgmyuv,png,"
197  "ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,im24,"
198  "sunras,xbm,xface,pix,y",
199  .priv_data_size = sizeof(VideoMuxData),
200  .video_codec = AV_CODEC_ID_MJPEG,
204  .priv_class = &img2mux_class,
205 };
206 #endif
207 #if CONFIG_IMAGE2PIPE_MUXER
208 AVOutputFormat ff_image2pipe_muxer = {
209  .name = "image2pipe",
210  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
211  .priv_data_size = sizeof(VideoMuxData),
212  .video_codec = AV_CODEC_ID_MJPEG,
216 };
217 #endif