]> git.sesse.net Git - ffmpeg/blob - libavfilter/vsrc_buffer.c
vsrc_buffer: set output timebase when output equalization is done
[ffmpeg] / libavfilter / vsrc_buffer.c
1 /*
2  * Copyright (c) 2008 Vitor Sessak
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 /**
22  * @file
23  * memory buffer source filter
24  */
25
26 #include "avfilter.h"
27 #include "vsrc_buffer.h"
28 #include "libavutil/imgutils.h"
29
30 typedef struct {
31     int64_t           pts;
32     AVFrame           frame;
33     int               has_frame;
34     int               h, w;
35     enum PixelFormat  pix_fmt;
36     AVRational        time_base;     ///< time_base to set in the output link
37     AVRational        pixel_aspect;
38     char              sws_param[256];
39 } BufferSourceContext;
40
41 int av_vsrc_buffer_add_frame2(AVFilterContext *buffer_filter, AVFrame *frame,
42                               int64_t pts, AVRational pixel_aspect, int width,
43                               int height, enum PixelFormat  pix_fmt,
44                               const char *sws_param)
45 {
46     BufferSourceContext *c = buffer_filter->priv;
47     int ret;
48
49     if (c->has_frame) {
50         av_log(buffer_filter, AV_LOG_ERROR,
51                "Buffering several frames is not supported. "
52                "Please consume all available frames before adding a new one.\n"
53             );
54         //return -1;
55     }
56
57     if(!c->sws_param[0]){
58         snprintf(c->sws_param, 255, "%d:%d:%s", c->w, c->h, sws_param);
59     }
60
61     if(width != c->w || height != c->h || pix_fmt != c->pix_fmt){
62         AVFilterContext *scale= buffer_filter->outputs[0]->dst;
63         AVFilterLink *link;
64
65         av_log(buffer_filter, AV_LOG_INFO, "Changing filter graph input to accept %dx%d %d (%d %d)\n",
66                width,height,pix_fmt, c->pix_fmt, scale && scale->outputs ? scale->outputs[0]->format : -123);
67
68         if(!scale || strcmp(scale->filter->name,"scale")){
69             AVFilter *f= avfilter_get_by_name("scale");
70
71             av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
72             if(avfilter_open(&scale, f, "Input equalizer") < 0)
73                 return -1;
74
75             if((ret=avfilter_init_filter(scale, c->sws_param, NULL))<0){
76                 avfilter_free(scale);
77                 return ret;
78             }
79
80             if((ret=avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0))<0){
81                 avfilter_free(scale);
82                 return ret;
83             }
84             scale->outputs[0]->time_base = scale->inputs[0]->time_base;
85
86             scale->outputs[0]->format= c->pix_fmt;
87         }
88
89         c->pix_fmt= scale->inputs[0]->format= pix_fmt;
90         c->w= scale->inputs[0]->w= width;
91         c->h= scale->inputs[0]->h= height;
92
93         link= scale->outputs[0];
94         if ((ret =  link->srcpad->config_props(link)) < 0)
95             return ret;
96     }
97
98     memcpy(c->frame.data    , frame->data    , sizeof(frame->data));
99     memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
100     c->frame.interlaced_frame= frame->interlaced_frame;
101     c->frame.top_field_first = frame->top_field_first;
102     c->frame.key_frame = frame->key_frame;
103     c->frame.pict_type = frame->pict_type;
104     c->pts = pts;
105     c->pixel_aspect = pixel_aspect;
106     c->has_frame = 1;
107
108     return 0;
109 }
110
111 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
112                              int64_t pts, AVRational pixel_aspect)
113 {
114     BufferSourceContext *c = buffer_filter->priv;
115
116     return av_vsrc_buffer_add_frame2(buffer_filter, frame,
117                               pts, pixel_aspect, c->w,
118                               c->h, c->pix_fmt, "");
119 }
120
121 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
122 {
123     BufferSourceContext *c = ctx->priv;
124     char pix_fmt_str[128];
125     int n = 0;
126
127     if (!args ||
128         (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
129                     &c->time_base.num, &c->time_base.den,
130                     &c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
131         av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
132         return AVERROR(EINVAL);
133     }
134     if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
135         char *tail;
136         c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
137         if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
138             av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
139             return AVERROR(EINVAL);
140         }
141     }
142
143     av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
144     return 0;
145 }
146
147 static int query_formats(AVFilterContext *ctx)
148 {
149     BufferSourceContext *c = ctx->priv;
150     enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
151
152     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
153     return 0;
154 }
155
156 static int config_props(AVFilterLink *link)
157 {
158     BufferSourceContext *c = link->src->priv;
159
160     link->w = c->w;
161     link->h = c->h;
162     link->sample_aspect_ratio = c->pixel_aspect;
163     link->time_base = c->time_base;
164
165     return 0;
166 }
167
168 static int request_frame(AVFilterLink *link)
169 {
170     BufferSourceContext *c = link->src->priv;
171     AVFilterBufferRef *picref;
172
173     if (!c->has_frame) {
174         av_log(link->src, AV_LOG_ERROR,
175                "request_frame() called with no available frame!\n");
176         //return -1;
177     }
178
179     /* This picture will be needed unmodified later for decoding the next
180      * frame */
181     picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
182                                        AV_PERM_REUSE2,
183                                        link->w, link->h);
184
185     av_image_copy(picref->data, picref->linesize,
186                   c->frame.data, c->frame.linesize,
187                   picref->format, link->w, link->h);
188
189     picref->pts                    = c->pts;
190     picref->video->pixel_aspect    = c->pixel_aspect;
191     picref->video->interlaced      = c->frame.interlaced_frame;
192     picref->video->top_field_first = c->frame.top_field_first;
193     picref->video->key_frame       = c->frame.key_frame;
194     picref->video->pict_type       = c->frame.pict_type;
195     avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
196     avfilter_draw_slice(link, 0, link->h, 1);
197     avfilter_end_frame(link);
198     avfilter_unref_buffer(picref);
199
200     c->has_frame = 0;
201
202     return 0;
203 }
204
205 static int poll_frame(AVFilterLink *link)
206 {
207     BufferSourceContext *c = link->src->priv;
208     return !!(c->has_frame);
209 }
210
211 AVFilter avfilter_vsrc_buffer = {
212     .name      = "buffer",
213     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
214     .priv_size = sizeof(BufferSourceContext),
215     .query_formats = query_formats,
216
217     .init      = init,
218
219     .inputs    = (AVFilterPad[]) {{ .name = NULL }},
220     .outputs   = (AVFilterPad[]) {{ .name            = "default",
221                                     .type            = AVMEDIA_TYPE_VIDEO,
222                                     .request_frame   = request_frame,
223                                     .poll_frame      = poll_frame,
224                                     .config_props    = config_props, },
225                                   { .name = NULL}},
226 };