Statistics
| Branch: | Revision:

ffmpeg / libavfilter / vsrc_movie.c @ 9b8bb626

History | View | Annotate | Download (10.9 KB)

1
/*
2
 * Copyright (c) 2010 Stefano Sabatini
3
 * Copyright (c) 2008 Victor Paesa
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg 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
 * FFmpeg 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 FFmpeg; 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 "libavcore/imgutils.h"
37
#include "libavformat/avformat.h"
38
#include "avfilter.h"
39

    
40
typedef struct {
41
    const AVClass *class;
42
    int64_t seek_point;   ///< seekpoint in microseconds
43
    double seek_point_d;
44
    char *format_name;
45
    char *file_name;
46
    int stream_index;
47

    
48
    AVFormatContext *format_ctx;
49
    AVCodecContext *codec_ctx;
50
    int is_done;
51
    AVFrame *frame;   ///< video frame to store the decoded images in
52

    
53
    int w, h;
54
    AVFilterBufferRef *picref;
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),  FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
61
{"f",            "set format name",         OFFSET(format_name),  FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
62
{"stream_index", "set stream index",        OFFSET(stream_index), FF_OPT_TYPE_INT,   -1,  -1,       INT_MAX  },
63
{"si",           "set stream index",        OFFSET(stream_index), FF_OPT_TYPE_INT,   -1,  -1,       INT_MAX  },
64
{"seek_point",   "set seekpoint (seconds)", OFFSET(seek_point_d), FF_OPT_TYPE_DOUBLE, 0,  0,        (INT64_MAX-1) / 1000000 },
65
{"sp",           "set seekpoint (seconds)", OFFSET(seek_point_d), FF_OPT_TYPE_DOUBLE, 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",
76
    movie_get_name,
77
    movie_options
78
};
79

    
80
static int movie_init(AVFilterContext *ctx)
81
{
82
    MovieContext *movie = ctx->priv;
83
    AVInputFormat *iformat = NULL;
84
    AVCodec *codec;
85
    int ret;
86
    int64_t timestamp;
87

    
88
    av_register_all();
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 = av_open_input_file(&movie->format_ctx, movie->file_name, iformat, 0, NULL)) < 0) {
95
        av_log(ctx, AV_LOG_ERROR,
96
               "Failed to av_open_input_file '%s'\n", movie->file_name);
97
        return ret;
98
    }
99
    if ((ret = av_find_stream_info(movie->format_ctx)) < 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 */
123
    if ((ret = av_find_best_stream(movie->format_ctx, AVMEDIA_TYPE_VIDEO,
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_open(movie->codec_ctx, codec)) < 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:%lld 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_defaults2(movie, 0, 0);
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)
195
        av_close_input_file(movie->format_ctx);
196
    avfilter_unref_buffer(movie->picref);
197
    av_freep(&movie->frame);
198
}
199

    
200
static int query_formats(AVFilterContext *ctx)
201
{
202
    MovieContext *movie = ctx->priv;
203
    enum PixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, PIX_FMT_NONE };
204

    
205
    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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 */
238
                movie->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE | AV_PERM_PRESERVE |
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

    
244
                /* FIXME: use a PTS correction mechanism as that in
245
                 * ffplay.c when some API will be available for that */
246
                /* use pkt_dts if pkt_pts is not available */
247
                movie->picref->pts = movie->frame->pkt_pts == AV_NOPTS_VALUE ?
248
                    movie->frame->pkt_dts : movie->frame->pkt_pts;
249

    
250
                movie->picref->pos                    = movie->frame->reordered_opaque;
251
                movie->picref->video->pixel_aspect = st->sample_aspect_ratio.num ?
252
                    st->sample_aspect_ratio : movie->codec_ctx->sample_aspect_ratio;
253
                movie->picref->video->interlaced      = movie->frame->interlaced_frame;
254
                movie->picref->video->top_field_first = movie->frame->top_field_first;
255
                av_dlog(outlink->src,
256
                        "movie_get_frame(): file:'%s' pts:%"PRId64" time:%lf pos:%"PRId64" aspect:%d/%d\n",
257
                        movie->file_name, movie->picref->pts,
258
                        (double)movie->picref->pts * av_q2d(st->time_base),
259
                        movie->picref->pos,
260
                        movie->picref->video->pixel_aspect.num, movie->picref->video->pixel_aspect.den);
261
                // We got it. Free the packet since we are returning
262
                av_free_packet(&pkt);
263

    
264
                return 0;
265
            }
266
        }
267
        // Free the packet that was allocated by av_read_frame
268
        av_free_packet(&pkt);
269
    }
270

    
271
    // On multi-frame source we should stop the mixing process when
272
    // the movie source does not have more frames
273
    if (ret == AVERROR_EOF)
274
        movie->is_done = 1;
275
    return ret;
276
}
277

    
278
static int request_frame(AVFilterLink *outlink)
279
{
280
    AVFilterBufferRef *outpicref;
281
    MovieContext *movie = outlink->src->priv;
282
    int ret;
283

    
284
    if (movie->is_done)
285
        return AVERROR_EOF;
286
    if ((ret = movie_get_frame(outlink)) < 0)
287
        return ret;
288

    
289
    outpicref = avfilter_ref_buffer(movie->picref, ~0);
290
    avfilter_start_frame(outlink, outpicref);
291
    avfilter_draw_slice(outlink, 0, outlink->h, 1);
292
    avfilter_end_frame(outlink);
293

    
294
    return 0;
295
}
296

    
297
AVFilter avfilter_vsrc_movie = {
298
    .name          = "movie",
299
    .description   = NULL_IF_CONFIG_SMALL("Read from a movie source."),
300
    .priv_size     = sizeof(MovieContext),
301
    .init          = init,
302
    .uninit        = uninit,
303
    .query_formats = query_formats,
304

    
305
    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
306
    .outputs   = (AVFilterPad[]) {{ .name            = "default",
307
                                    .type            = AVMEDIA_TYPE_VIDEO,
308
                                    .request_frame   = request_frame,
309
                                    .config_props    = config_output_props, },
310
                                  { .name = NULL}},
311
};