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 /* #define DEBUG */
32 
33 #include <float.h>
34 #include "libavutil/avstring.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/imgutils.h"
37 #include "libavformat/avformat.h"
38 #include "avfilter.h"
39 
40 typedef struct {
41  const AVClass *class;
42  int64_t seek_point;
43  double seek_point_d;
44  char *format_name;
45  char *file_name;
47 
50  int is_done;
52 
53  int w, h;
55 } MovieContext;
56 
57 #define OFFSET(x) offsetof(MovieContext, x)
58 
59 static const AVOption movie_options[]= {
60 {"format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
61 {"f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
62 {"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX },
63 {"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX },
64 {"seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
65 {"sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
66 {NULL},
67 };
68 
69 static const char *movie_get_name(void *ctx)
70 {
71  return "movie";
72 }
73 
74 static const AVClass movie_class = {
75  "MovieContext",
77  movie_options
78 };
79 
80 static int movie_init(AVFilterContext *ctx)
81 {
82  MovieContext *movie = ctx->priv;
84  AVCodec *codec;
85  int ret;
86  int64_t timestamp;
87 
89 
90  // Try to find the movie format (container)
91  iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
92 
93  movie->format_ctx = NULL;
94  if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
95  av_log(ctx, AV_LOG_ERROR,
96  "Failed to avformat_open_input '%s'\n", movie->file_name);
97  return ret;
98  }
99  if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
100  av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
101 
102  // if seeking requested, we execute it
103  if (movie->seek_point > 0) {
104  timestamp = movie->seek_point;
105  // add the stream start time, should it exist
106  if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
107  if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
108  av_log(ctx, AV_LOG_ERROR,
109  "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
110  movie->file_name, movie->format_ctx->start_time, movie->seek_point);
111  return AVERROR(EINVAL);
112  }
113  timestamp += movie->format_ctx->start_time;
114  }
115  if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
116  av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
117  movie->file_name, timestamp);
118  return ret;
119  }
120  }
121 
122  /* select the video stream */
124  movie->stream_index, -1, NULL, 0)) < 0) {
125  av_log(ctx, AV_LOG_ERROR, "No video stream with index '%d' found\n",
126  movie->stream_index);
127  return ret;
128  }
129  movie->stream_index = ret;
130  movie->codec_ctx = movie->format_ctx->streams[movie->stream_index]->codec;
131 
132  /*
133  * So now we've got a pointer to the so-called codec context for our video
134  * stream, but we still have to find the actual codec and open it.
135  */
136  codec = avcodec_find_decoder(movie->codec_ctx->codec_id);
137  if (!codec) {
138  av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n");
139  return AVERROR(EINVAL);
140  }
141 
142  if ((ret = avcodec_open2(movie->codec_ctx, codec, NULL)) < 0) {
143  av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n");
144  return ret;
145  }
146 
147  if (!(movie->frame = avcodec_alloc_frame()) ) {
148  av_log(ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
149  return AVERROR(ENOMEM);
150  }
151 
152  movie->w = movie->codec_ctx->width;
153  movie->h = movie->codec_ctx->height;
154 
155  av_log(ctx, AV_LOG_INFO, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
156  movie->seek_point, movie->format_name, movie->file_name,
157  movie->stream_index);
158 
159  return 0;
160 }
161 
162 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
163 {
164  MovieContext *movie = ctx->priv;
165  int ret;
166  movie->class = &movie_class;
167  av_opt_set_defaults(movie);
168 
169  if (args)
170  movie->file_name = av_get_token(&args, ":");
171  if (!movie->file_name || !*movie->file_name) {
172  av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
173  return AVERROR(EINVAL);
174  }
175 
176  if (*args++ == ':' && (ret = av_set_options_string(movie, args, "=", ":")) < 0) {
177  av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
178  return ret;
179  }
180 
181  movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
182 
183  return movie_init(ctx);
184 }
185 
186 static av_cold void uninit(AVFilterContext *ctx)
187 {
188  MovieContext *movie = ctx->priv;
189 
190  av_free(movie->file_name);
191  av_free(movie->format_name);
192  if (movie->codec_ctx)
193  avcodec_close(movie->codec_ctx);
194  if (movie->format_ctx)
197  av_freep(&movie->frame);
198 }
199 
201 {
202  MovieContext *movie = ctx->priv;
203  enum PixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, PIX_FMT_NONE };
204 
206  return 0;
207 }
208 
209 static int config_output_props(AVFilterLink *outlink)
210 {
211  MovieContext *movie = outlink->src->priv;
212 
213  outlink->w = movie->w;
214  outlink->h = movie->h;
215  outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base;
216 
217  return 0;
218 }
219 
220 static int movie_get_frame(AVFilterLink *outlink)
221 {
222  MovieContext *movie = outlink->src->priv;
223  AVPacket pkt;
224  int ret, frame_decoded;
225  AVStream *st = movie->format_ctx->streams[movie->stream_index];
226 
227  if (movie->is_done == 1)
228  return 0;
229 
230  while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) {
231  // Is this a packet from the video stream?
232  if (pkt.stream_index == movie->stream_index) {
233  movie->codec_ctx->reordered_opaque = pkt.pos;
234  avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt);
235 
236  if (frame_decoded) {
237  /* FIXME: avoid the memcpy */
239  AV_PERM_REUSE2, outlink->w, outlink->h);
240  av_image_copy(movie->picref->data, movie->picref->linesize,
241  movie->frame->data, movie->frame->linesize,
242  movie->picref->format, outlink->w, outlink->h);
243  avfilter_copy_frame_props(movie->picref, movie->frame);
244 
245  /* FIXME: use a PTS correction mechanism as that in
246  * ffplay.c when some API will be available for that */
247  /* use pkt_dts if pkt_pts is not available */
248  movie->picref->pts = movie->frame->pkt_pts == AV_NOPTS_VALUE ?
249  movie->frame->pkt_dts : movie->frame->pkt_pts;
250 
251  movie->picref->pos = movie->frame->reordered_opaque;
252  if (!movie->frame->sample_aspect_ratio.num)
254  av_dlog(outlink->src,
255  "movie_get_frame(): file:'%s' pts:%"PRId64" time:%lf pos:%"PRId64" aspect:%d/%d\n",
256  movie->file_name, movie->picref->pts,
257  (double)movie->picref->pts * av_q2d(st->time_base),
258  movie->picref->pos,
259  movie->picref->video->pixel_aspect.num, movie->picref->video->pixel_aspect.den);
260  // We got it. Free the packet since we are returning
261  av_free_packet(&pkt);
262 
263  return 0;
264  }
265  }
266  // Free the packet that was allocated by av_read_frame
267  av_free_packet(&pkt);
268  }
269 
270  // On multi-frame source we should stop the mixing process when
271  // the movie source does not have more frames
272  if (ret == AVERROR_EOF)
273  movie->is_done = 1;
274  return ret;
275 }
276 
277 static int request_frame(AVFilterLink *outlink)
278 {
279  AVFilterBufferRef *outpicref;
280  MovieContext *movie = outlink->src->priv;
281  int ret;
282 
283  if (movie->is_done)
284  return AVERROR_EOF;
285  if ((ret = movie_get_frame(outlink)) < 0)
286  return ret;
287 
288  outpicref = avfilter_ref_buffer(movie->picref, ~0);
289  avfilter_start_frame(outlink, outpicref);
290  avfilter_draw_slice(outlink, 0, outlink->h, 1);
291  avfilter_end_frame(outlink);
293  movie->picref = NULL;
294 
295  return 0;
296 }
297 
299  .name = "movie",
300  .description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
301  .priv_size = sizeof(MovieContext),
302  .init = init,
303  .uninit = uninit,
305 
306  .inputs = (AVFilterPad[]) {{ .name = NULL }},
307  .outputs = (AVFilterPad[]) {{ .name = "default",
308  .type = AVMEDIA_TYPE_VIDEO,
309  .request_frame = request_frame,
310  .config_props = config_output_props, },
311  { .name = NULL}},
312 };