FFmpeg: libavformat/img2enc.c Source File

FFmpeg
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"
29 #include "avformat.h"
30 #include "avio_internal.h"
31 #include "internal.h"
32 
33  typedef struct {
34   const AVClass *class; /**< Class for private options. */
35   int img_number;
36   int is_pipe;
37   int split_planes; /**< use independent file for each Y, U, V plane */
38   char path[1024];
39   int update;
40   int use_strftime;
41   const char *muxer;
42 } VideoMuxData;
43 
44  static int write_header(AVFormatContext *s)
45 {
46  VideoMuxData *img = s->priv_data;
47  AVStream *st = s->streams[0];
48  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(st->codec->pix_fmt);
49 
50  av_strlcpy(img->path, s->filename, sizeof(img->path));
51 
52  /* find format */
53  if (s->oformat->flags & AVFMT_NOFILE)
54  img->is_pipe = 0;
55  else
56  img->is_pipe = 1;
57 
58  if (st->codec->codec_id == AV_CODEC_ID_GIF) {
59  img->muxer = "gif";
60  } else if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
61  const char *str = strrchr(img->path, '.');
62  img->split_planes = str
63  && !av_strcasecmp(str + 1, "y")
64  && s->nb_streams == 1
65  && desc
66  &&(desc->flags & AV_PIX_FMT_FLAG_PLANAR)
67  && desc->nb_components >= 3;
68  }
69  return 0;
70 }
71 
72  static int write_packet(AVFormatContext *s, AVPacket *pkt)
73 {
74  VideoMuxData *img = s->priv_data;
75  AVIOContext *pb[4];
76  char filename[1024];
77  AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
78  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(codec->pix_fmt);
79  int i;
80 
81  if (!img->is_pipe) {
82  if (img->update) {
83  av_strlcpy(filename, img->path, sizeof(filename));
84  } else if (img->use_strftime) {
85  time_t now0;
86  struct tm *tm;
87  time(&now0);
88  tm = localtime(&now0);
89  if (!strftime(filename, sizeof(filename), img->path, tm)) {
90  av_log(s, AV_LOG_ERROR, "Could not get frame filename with strftime\n");
91  return AVERROR(EINVAL);
92  }
93  } else if (av_get_frame_filename(filename, sizeof(filename), img->path, img->img_number) < 0 &&
94  img->img_number > 1) {
95  av_log(s, AV_LOG_ERROR,
96  "Could not get frame filename number %d from pattern '%s' (either set updatefirst or use a pattern like %%03d within the filename pattern)\n",
97  img->img_number, img->path);
98  return AVERROR(EINVAL);
99  }
100  for (i = 0; i < 4; i++) {
101  if (avio_open2(&pb[i], filename, AVIO_FLAG_WRITE,
102  &s->interrupt_callback, NULL) < 0) {
103  av_log(s, AV_LOG_ERROR, "Could not open file : %s\n", filename);
104  return AVERROR(EIO);
105  }
106 
107  if (!img->split_planes || i+1 >= desc->nb_components)
108  break;
109  filename[strlen(filename) - 1] = "UVAx"[i];
110  }
111  } else {
112  pb[0] = s->pb;
113  }
114 
115  if (img->split_planes) {
116  int ysize = codec->width * codec->height;
117  int usize = FF_CEIL_RSHIFT(codec->width, desc->log2_chroma_w) * FF_CEIL_RSHIFT(codec->height, desc->log2_chroma_h);
118  if (desc->comp[0].depth_minus1 >= 8) {
119  ysize *= 2;
120  usize *= 2;
121  }
122  avio_write(pb[0], pkt->data , ysize);
123  avio_write(pb[1], pkt->data + ysize , usize);
124  avio_write(pb[2], pkt->data + ysize + usize, usize);
125  avio_close(pb[1]);
126  avio_close(pb[2]);
127  if (desc->nb_components > 3) {
128  avio_write(pb[3], pkt->data + ysize + 2*usize, ysize);
129  avio_close(pb[3]);
130  }
131  } else if (img->muxer) {
132  int ret;
133  AVStream *st;
134  AVPacket pkt2 = {0};
135  AVFormatContext *fmt = NULL;
136 
137  av_assert0(!img->split_planes);
138 
139  ret = avformat_alloc_output_context2(&fmt, NULL, img->muxer, s->filename);
140  if (ret < 0)
141  return ret;
142  st = avformat_new_stream(fmt, NULL);
143  if (!st) {
144  avformat_free_context(fmt);
145  return AVERROR(ENOMEM);
146  }
147  st->id = pkt->stream_index;
148 
149  fmt->pb = pb[0];
150  if ((ret = av_copy_packet(&pkt2, pkt)) < 0 ||
151  (ret = av_dup_packet(&pkt2)) < 0 ||
152  (ret = avcodec_copy_context(st->codec, s->streams[0]->codec)) < 0 ||
153  (ret = avformat_write_header(fmt, NULL)) < 0 ||
154  (ret = av_interleaved_write_frame(fmt, &pkt2)) < 0 ||
155  (ret = av_write_trailer(fmt)) < 0) {
156  av_free_packet(&pkt2);
157  avformat_free_context(fmt);
158  return ret;
159  }
160  av_free_packet(&pkt2);
161  avformat_free_context(fmt);
162  } else {
163  avio_write(pb[0], pkt->data, pkt->size);
164  }
165  avio_flush(pb[0]);
166  if (!img->is_pipe) {
167  avio_close(pb[0]);
168  }
169 
170  img->img_number++;
171  return 0;
172 }
173 
174  #define OFFSET(x) offsetof(VideoMuxData, x)
175  #define ENC AV_OPT_FLAG_ENCODING_PARAM
176  static const AVOption muxoptions[] = {
177  { "updatefirst", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
178  { "update", "continuously overwrite one file", OFFSET(update), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
179  { "start_number", "set first number in the sequence", OFFSET(img_number), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, ENC },
180  { "strftime", "use strftime for filename", OFFSET(use_strftime), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
181  { NULL },
182 };
183 
184 #if CONFIG_IMAGE2_MUXER
185 static const AVClass img2mux_class = {
186  .class_name = "image2 muxer",
187  .item_name = av_default_item_name,
188  .option = muxoptions,
189  .version = LIBAVUTIL_VERSION_INT,
190 };
191 
192 AVOutputFormat ff_image2_muxer = {
193  .name = "image2",
194  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
195  .extensions = "bmp,dpx,jls,jpeg,jpg,ljpg,pam,pbm,pcx,pgm,pgmyuv,png,"
196  "ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,im24,"
197  "sunras,webp,xbm,xface,pix,y",
198  .priv_data_size = sizeof(VideoMuxData),
199  .video_codec = AV_CODEC_ID_MJPEG,
200  .write_header = write_header,
201  .write_packet = write_packet,
202  .flags = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS | AVFMT_NOFILE,
203  .priv_class = &img2mux_class,
204 };
205 #endif
206 #if CONFIG_IMAGE2PIPE_MUXER
207 AVOutputFormat ff_image2pipe_muxer = {
208  .name = "image2pipe",
209  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
210  .priv_data_size = sizeof(VideoMuxData),
211  .video_codec = AV_CODEC_ID_MJPEG,
212  .write_header = write_header,
213  .write_packet = write_packet,
214  .flags = AVFMT_NOTIMESTAMPS | AVFMT_NODIMENSIONS
215 };
216 #endif
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