Libav
vsrc_movie.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
3  * Copyright (c) 2008 Victor Paesa
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 
31 #include <float.h>
32 #include <stdint.h>
33 
34 #include "libavutil/attributes.h"
35 #include "libavutil/avstring.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/imgutils.h"
38 #include "libavformat/avformat.h"
39 #include "avfilter.h"
40 #include "formats.h"
41 #include "internal.h"
42 #include "video.h"
43 
44 typedef struct {
45  const AVClass *class;
46  int64_t seek_point;
47  double seek_point_d;
48  char *format_name;
49  char *file_name;
51 
54  int is_done;
56 
57  int w, h;
58 } MovieContext;
59 
60 #define OFFSET(x) offsetof(MovieContext, x)
61 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
62 
63 static const AVOption movie_options[]= {
64  { "filename", NULL, OFFSET(file_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
65  { "format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
66  { "f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
67  { "stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
68  { "si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
69  { "seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
70  { "sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
71  { NULL },
72 };
73 
74 static const char *movie_get_name(void *ctx)
75 {
76  return "movie";
77 }
78 
79 static const AVClass movie_class = {
80  "MovieContext",
82  movie_options
83 };
84 
86 {
87  MovieContext *movie = ctx->priv;
89  AVCodec *codec;
90  int ret;
91  int64_t timestamp;
92 
94 
95  // Try to find the movie format (container)
96  iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
97 
98  movie->format_ctx = NULL;
99  if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
100  av_log(ctx, AV_LOG_ERROR,
101  "Failed to avformat_open_input '%s'\n", movie->file_name);
102  return ret;
103  }
104  if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
105  av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
106 
107  // if seeking requested, we execute it
108  if (movie->seek_point > 0) {
109  timestamp = movie->seek_point;
110  // add the stream start time, should it exist
111  if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
112  if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
113  av_log(ctx, AV_LOG_ERROR,
114  "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
115  movie->file_name, movie->format_ctx->start_time, movie->seek_point);
116  return AVERROR(EINVAL);
117  }
118  timestamp += movie->format_ctx->start_time;
119  }
120  if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
121  av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
122  movie->file_name, timestamp);
123  return ret;
124  }
125  }
126 
127  /* select the video stream */
129  movie->stream_index, -1, NULL, 0)) < 0) {
130  av_log(ctx, AV_LOG_ERROR, "No video stream with index '%d' found\n",
131  movie->stream_index);
132  return ret;
133  }
134  movie->stream_index = ret;
135  movie->codec_ctx = movie->format_ctx->streams[movie->stream_index]->codec;
136 
137  /*
138  * So now we've got a pointer to the so-called codec context for our video
139  * stream, but we still have to find the actual codec and open it.
140  */
141  codec = avcodec_find_decoder(movie->codec_ctx->codec_id);
142  if (!codec) {
143  av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n");
144  return AVERROR(EINVAL);
145  }
146 
147  movie->codec_ctx->refcounted_frames = 1;
148 
149  if ((ret = avcodec_open2(movie->codec_ctx, codec, NULL)) < 0) {
150  av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n");
151  return ret;
152  }
153 
154  movie->w = movie->codec_ctx->width;
155  movie->h = movie->codec_ctx->height;
156 
157  av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
158  movie->seek_point, movie->format_name, movie->file_name,
159  movie->stream_index);
160 
161  return 0;
162 }
163 
164 static av_cold int init(AVFilterContext *ctx)
165 {
166  MovieContext *movie = ctx->priv;
167 
168  movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
169 
170  return movie_init(ctx);
171 }
172 
173 static av_cold void uninit(AVFilterContext *ctx)
174 {
175  MovieContext *movie = ctx->priv;
176 
177  if (movie->codec_ctx)
178  avcodec_close(movie->codec_ctx);
179  if (movie->format_ctx)
181  av_frame_free(&movie->frame);
182 }
183 
185 {
186  MovieContext *movie = ctx->priv;
187  enum AVPixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, AV_PIX_FMT_NONE };
188 
190  return 0;
191 }
192 
193 static int config_output_props(AVFilterLink *outlink)
194 {
195  MovieContext *movie = outlink->src->priv;
196 
197  outlink->w = movie->w;
198  outlink->h = movie->h;
199  outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base;
200 
201  return 0;
202 }
203 
204 static int movie_get_frame(AVFilterLink *outlink)
205 {
206  MovieContext *movie = outlink->src->priv;
207  AVPacket pkt;
208  int ret, frame_decoded;
209  AVStream av_unused *st = movie->format_ctx->streams[movie->stream_index];
210 
211  if (movie->is_done == 1)
212  return 0;
213 
214  movie->frame = av_frame_alloc();
215  if (!movie->frame)
216  return AVERROR(ENOMEM);
217 
218  while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) {
219  // Is this a packet from the video stream?
220  if (pkt.stream_index == movie->stream_index) {
221  avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt);
222 
223  if (frame_decoded) {
224  if (movie->frame->pkt_pts != AV_NOPTS_VALUE)
225  movie->frame->pts = movie->frame->pkt_pts;
226  av_dlog(outlink->src,
227  "movie_get_frame(): file:'%s' pts:%"PRId64" time:%f aspect:%d/%d\n",
228  movie->file_name, movie->frame->pts,
229  (double)movie->frame->pts * av_q2d(st->time_base),
230  movie->frame->sample_aspect_ratio.num,
231  movie->frame->sample_aspect_ratio.den);
232  // We got it. Free the packet since we are returning
233  av_free_packet(&pkt);
234 
235  return 0;
236  }
237  }
238  // Free the packet that was allocated by av_read_frame
239  av_free_packet(&pkt);
240  }
241 
242  // On multi-frame source we should stop the mixing process when
243  // the movie source does not have more frames
244  if (ret == AVERROR_EOF)
245  movie->is_done = 1;
246  return ret;
247 }
248 
249 static int request_frame(AVFilterLink *outlink)
250 {
251  MovieContext *movie = outlink->src->priv;
252  int ret;
253 
254  if (movie->is_done)
255  return AVERROR_EOF;
256  if ((ret = movie_get_frame(outlink)) < 0)
257  return ret;
258 
259  ret = ff_filter_frame(outlink, movie->frame);
260  movie->frame = NULL;
261 
262  return ret;
263 }
264 
266  {
267  .name = "default",
268  .type = AVMEDIA_TYPE_VIDEO,
269  .request_frame = request_frame,
270  .config_props = config_output_props,
271  },
272  { NULL }
273 };
274 
276  .name = "movie",
277  .description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
278  .priv_size = sizeof(MovieContext),
279  .priv_class = &movie_class,
280  .init = init,
281  .uninit = uninit,
283 
284  .inputs = NULL,
285  .outputs = avfilter_vsrc_movie_outputs,
286 };