aeab10235ca838fd7324e16539cc4136662cf40a
[libav.git] / libavfilter / vsrc_movie.c
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
22 /**
23 * @file
24 * movie video source
25 *
26 * @todo use direct rendering (no allocation of a new frame)
27 * @todo support a PTS correction mechanism
28 * @todo support more than one output stream
29 */
30
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 #include "formats.h"
40 #include "internal.h"
41 #include "video.h"
42
43 typedef struct {
44 const AVClass *class;
45 int64_t seek_point; ///< seekpoint in microseconds
46 double seek_point_d;
47 char *format_name;
48 char *file_name;
49 int stream_index;
50
51 AVFormatContext *format_ctx;
52 AVCodecContext *codec_ctx;
53 int is_done;
54 AVFrame *frame; ///< video frame to store the decoded images in
55
56 int w, h;
57 AVFilterBufferRef *picref;
58 } MovieContext;
59
60 #define OFFSET(x) offsetof(MovieContext, x)
61
62 static const AVOption movie_options[]= {
63 {"format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
64 {"f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
65 {"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX },
66 {"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX },
67 {"seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
68 {"sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
69 {NULL},
70 };
71
72 static const char *movie_get_name(void *ctx)
73 {
74 return "movie";
75 }
76
77 static const AVClass movie_class = {
78 "MovieContext",
79 movie_get_name,
80 movie_options
81 };
82
83 static int movie_init(AVFilterContext *ctx)
84 {
85 MovieContext *movie = ctx->priv;
86 AVInputFormat *iformat = NULL;
87 AVCodec *codec;
88 int ret;
89 int64_t timestamp;
90
91 av_register_all();
92
93 // Try to find the movie format (container)
94 iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
95
96 movie->format_ctx = NULL;
97 if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
98 av_log(ctx, AV_LOG_ERROR,
99 "Failed to avformat_open_input '%s'\n", movie->file_name);
100 return ret;
101 }
102 if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
103 av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
104
105 // if seeking requested, we execute it
106 if (movie->seek_point > 0) {
107 timestamp = movie->seek_point;
108 // add the stream start time, should it exist
109 if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
110 if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
111 av_log(ctx, AV_LOG_ERROR,
112 "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
113 movie->file_name, movie->format_ctx->start_time, movie->seek_point);
114 return AVERROR(EINVAL);
115 }
116 timestamp += movie->format_ctx->start_time;
117 }
118 if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
119 av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
120 movie->file_name, timestamp);
121 return ret;
122 }
123 }
124
125 /* select the video stream */
126 if ((ret = av_find_best_stream(movie->format_ctx, AVMEDIA_TYPE_VIDEO,
127 movie->stream_index, -1, NULL, 0)) < 0) {
128 av_log(ctx, AV_LOG_ERROR, "No video stream with index '%d' found\n",
129 movie->stream_index);
130 return ret;
131 }
132 movie->stream_index = ret;
133 movie->codec_ctx = movie->format_ctx->streams[movie->stream_index]->codec;
134
135 /*
136 * So now we've got a pointer to the so-called codec context for our video
137 * stream, but we still have to find the actual codec and open it.
138 */
139 codec = avcodec_find_decoder(movie->codec_ctx->codec_id);
140 if (!codec) {
141 av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n");
142 return AVERROR(EINVAL);
143 }
144
145 if ((ret = avcodec_open2(movie->codec_ctx, codec, NULL)) < 0) {
146 av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n");
147 return ret;
148 }
149
150 if (!(movie->frame = avcodec_alloc_frame()) ) {
151 av_log(ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
152 return AVERROR(ENOMEM);
153 }
154
155 movie->w = movie->codec_ctx->width;
156 movie->h = movie->codec_ctx->height;
157
158 av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
159 movie->seek_point, movie->format_name, movie->file_name,
160 movie->stream_index);
161
162 return 0;
163 }
164
165 static av_cold int init(AVFilterContext *ctx, const char *args)
166 {
167 MovieContext *movie = ctx->priv;
168 int ret;
169 movie->class = &movie_class;
170 av_opt_set_defaults(movie);
171
172 if (args)
173 movie->file_name = av_get_token(&args, ":");
174 if (!movie->file_name || !*movie->file_name) {
175 av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
176 return AVERROR(EINVAL);
177 }
178
179 if (*args++ == ':' && (ret = av_set_options_string(movie, args, "=", ":")) < 0) {
180 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
181 return ret;
182 }
183
184 movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
185
186 return movie_init(ctx);
187 }
188
189 static av_cold void uninit(AVFilterContext *ctx)
190 {
191 MovieContext *movie = ctx->priv;
192
193 av_free(movie->file_name);
194 av_free(movie->format_name);
195 if (movie->codec_ctx)
196 avcodec_close(movie->codec_ctx);
197 if (movie->format_ctx)
198 avformat_close_input(&movie->format_ctx);
199 avfilter_unref_buffer(movie->picref);
200 av_freep(&movie->frame);
201 }
202
203 static int query_formats(AVFilterContext *ctx)
204 {
205 MovieContext *movie = ctx->priv;
206 enum PixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, PIX_FMT_NONE };
207
208 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
209 return 0;
210 }
211
212 static int config_output_props(AVFilterLink *outlink)
213 {
214 MovieContext *movie = outlink->src->priv;
215
216 outlink->w = movie->w;
217 outlink->h = movie->h;
218 outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base;
219
220 return 0;
221 }
222
223 static int movie_get_frame(AVFilterLink *outlink)
224 {
225 MovieContext *movie = outlink->src->priv;
226 AVPacket pkt;
227 int ret, frame_decoded;
228 AVStream *st = movie->format_ctx->streams[movie->stream_index];
229
230 if (movie->is_done == 1)
231 return 0;
232
233 while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) {
234 // Is this a packet from the video stream?
235 if (pkt.stream_index == movie->stream_index) {
236 movie->codec_ctx->reordered_opaque = pkt.pos;
237 avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt);
238
239 if (frame_decoded) {
240 /* FIXME: avoid the memcpy */
241 movie->picref = ff_get_video_buffer(outlink, AV_PERM_WRITE | AV_PERM_PRESERVE |
242 AV_PERM_REUSE2, outlink->w, outlink->h);
243 av_image_copy(movie->picref->data, movie->picref->linesize,
244 movie->frame->data, movie->frame->linesize,
245 movie->picref->format, outlink->w, outlink->h);
246 avfilter_copy_frame_props(movie->picref, movie->frame);
247
248 /* FIXME: use a PTS correction mechanism as that in
249 * ffplay.c when some API will be available for that */
250 /* use pkt_dts if pkt_pts is not available */
251 movie->picref->pts = movie->frame->pkt_pts == AV_NOPTS_VALUE ?
252 movie->frame->pkt_dts : movie->frame->pkt_pts;
253
254 movie->picref->pos = movie->frame->reordered_opaque;
255 if (!movie->frame->sample_aspect_ratio.num)
256 movie->picref->video->pixel_aspect = st->sample_aspect_ratio;
257 av_dlog(outlink->src,
258 "movie_get_frame(): file:'%s' pts:%"PRId64" time:%lf pos:%"PRId64" aspect:%d/%d\n",
259 movie->file_name, movie->picref->pts,
260 (double)movie->picref->pts * av_q2d(st->time_base),
261 movie->picref->pos,
262 movie->picref->video->pixel_aspect.num, movie->picref->video->pixel_aspect.den);
263 // We got it. Free the packet since we are returning
264 av_free_packet(&pkt);
265
266 return 0;
267 }
268 }
269 // Free the packet that was allocated by av_read_frame
270 av_free_packet(&pkt);
271 }
272
273 // On multi-frame source we should stop the mixing process when
274 // the movie source does not have more frames
275 if (ret == AVERROR_EOF)
276 movie->is_done = 1;
277 return ret;
278 }
279
280 static int request_frame(AVFilterLink *outlink)
281 {
282 AVFilterBufferRef *outpicref;
283 MovieContext *movie = outlink->src->priv;
284 int ret;
285
286 if (movie->is_done)
287 return AVERROR_EOF;
288 if ((ret = movie_get_frame(outlink)) < 0)
289 return ret;
290
291 outpicref = avfilter_ref_buffer(movie->picref, ~0);
292 if (!outpicref) {
293 ret = AVERROR(ENOMEM);
294 goto fail;
295 }
296
297 ret = ff_start_frame(outlink, outpicref);
298 if (ret < 0)
299 goto fail;
300
301 ret = ff_draw_slice(outlink, 0, outlink->h, 1);
302 if (ret < 0)
303 goto fail;
304
305 ret = ff_end_frame(outlink);
306 fail:
307 avfilter_unref_bufferp(&movie->picref);
308
309 return ret;
310 }
311
312 AVFilter avfilter_vsrc_movie = {
313 .name = "movie",
314 .description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
315 .priv_size = sizeof(MovieContext),
316 .init = init,
317 .uninit = uninit,
318 .query_formats = query_formats,
319
320 .inputs = NULL,
321 .outputs = (const AVFilterPad[]) {{ .name = "default",
322 .type = AVMEDIA_TYPE_VIDEO,
323 .request_frame = request_frame,
324 .config_props = config_output_props, },
325 { .name = NULL}},
326 };