libavfilter/fifo: switch to filter_frame, the filter did not support slices.
[ffmpeg.git] / libavfilter / fifo.c
1 /*
2  * Copyright (c) 2007 Bobby Bingham
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  * FIFO buffering filter
24  */
25
26 #include "libavutil/avassert.h"
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/common.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/samplefmt.h"
31
32 #include "audio.h"
33 #include "avfilter.h"
34 #include "internal.h"
35 #include "video.h"
36
37 typedef struct Buf {
38     AVFilterBufferRef *buf;
39     struct Buf        *next;
40 } Buf;
41
42 typedef struct {
43     Buf  root;
44     Buf *last;   ///< last buffered frame
45
46     /**
47      * When a specific number of output samples is requested, the partial
48      * buffer is stored here
49      */
50     AVFilterBufferRef *buf_out;
51     int allocated_samples;      ///< number of samples buf_out was allocated for
52 } FifoContext;
53
54 static av_cold int init(AVFilterContext *ctx, const char *args)
55 {
56     FifoContext *fifo = ctx->priv;
57     fifo->last = &fifo->root;
58
59     return 0;
60 }
61
62 static av_cold void uninit(AVFilterContext *ctx)
63 {
64     FifoContext *fifo = ctx->priv;
65     Buf *buf, *tmp;
66
67     for (buf = fifo->root.next; buf; buf = tmp) {
68         tmp = buf->next;
69         avfilter_unref_bufferp(&buf->buf);
70         av_free(buf);
71     }
72
73     avfilter_unref_bufferp(&fifo->buf_out);
74 }
75
76 static int add_to_queue(AVFilterLink *inlink, AVFilterBufferRef *buf)
77 {
78     FifoContext *fifo = inlink->dst->priv;
79
80     fifo->last->next = av_mallocz(sizeof(Buf));
81     if (!fifo->last->next) {
82         avfilter_unref_buffer(buf);
83         return AVERROR(ENOMEM);
84     }
85
86     fifo->last = fifo->last->next;
87     fifo->last->buf = buf;
88
89     return 0;
90 }
91
92 static void queue_pop(FifoContext *s)
93 {
94     Buf *tmp = s->root.next->next;
95     if (s->last == s->root.next)
96         s->last = &s->root;
97     av_freep(&s->root.next);
98     s->root.next = tmp;
99 }
100
101 /**
102  * Move data pointers and pts offset samples forward.
103  */
104 static void buffer_offset(AVFilterLink *link, AVFilterBufferRef *buf,
105                           int offset)
106 {
107     int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
108     int planar = av_sample_fmt_is_planar(link->format);
109     int planes = planar ? nb_channels : 1;
110     int block_align = av_get_bytes_per_sample(link->format) * (planar ? 1 : nb_channels);
111     int i;
112
113     av_assert0(buf->audio->nb_samples > offset);
114
115     for (i = 0; i < planes; i++)
116         buf->extended_data[i] += block_align*offset;
117     if (buf->data != buf->extended_data)
118         memcpy(buf->data, buf->extended_data,
119                FFMIN(planes, FF_ARRAY_ELEMS(buf->data)) * sizeof(*buf->data));
120     buf->linesize[0] -= block_align*offset;
121     buf->audio->nb_samples -= offset;
122
123     if (buf->pts != AV_NOPTS_VALUE) {
124         buf->pts += av_rescale_q(offset, (AVRational){1, link->sample_rate},
125                                  link->time_base);
126     }
127 }
128
129 static int calc_ptr_alignment(AVFilterBufferRef *buf)
130 {
131     int planes = av_sample_fmt_is_planar(buf->format) ?
132                  av_get_channel_layout_nb_channels(buf->audio->channel_layout) : 1;
133     int min_align = 128;
134     int p;
135
136     for (p = 0; p < planes; p++) {
137         int cur_align = 128;
138         while ((intptr_t)buf->extended_data[p] % cur_align)
139             cur_align >>= 1;
140         if (cur_align < min_align)
141             min_align = cur_align;
142     }
143     return min_align;
144 }
145
146 static int return_audio_frame(AVFilterContext *ctx)
147 {
148     AVFilterLink *link = ctx->outputs[0];
149     FifoContext *s = ctx->priv;
150     AVFilterBufferRef *head = s->root.next->buf;
151     AVFilterBufferRef *buf_out;
152     int ret;
153
154     if (!s->buf_out &&
155         head->audio->nb_samples >= link->request_samples &&
156         calc_ptr_alignment(head) >= 32) {
157         if (head->audio->nb_samples == link->request_samples) {
158             buf_out = head;
159             queue_pop(s);
160         } else {
161             buf_out = avfilter_ref_buffer(head, AV_PERM_READ);
162             if (!buf_out)
163                 return AVERROR(ENOMEM);
164
165             buf_out->audio->nb_samples = link->request_samples;
166             buffer_offset(link, head, link->request_samples);
167         }
168     } else {
169         int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
170
171         if (!s->buf_out) {
172             s->buf_out = ff_get_audio_buffer(link, AV_PERM_WRITE,
173                                              link->request_samples);
174             if (!s->buf_out)
175                 return AVERROR(ENOMEM);
176
177             s->buf_out->audio->nb_samples = 0;
178             s->buf_out->pts               = head->pts;
179             s->allocated_samples          = link->request_samples;
180         } else if (link->request_samples != s->allocated_samples) {
181             av_log(ctx, AV_LOG_ERROR, "request_samples changed before the "
182                    "buffer was returned.\n");
183             return AVERROR(EINVAL);
184         }
185
186         while (s->buf_out->audio->nb_samples < s->allocated_samples) {
187             int len = FFMIN(s->allocated_samples - s->buf_out->audio->nb_samples,
188                             head->audio->nb_samples);
189
190             av_samples_copy(s->buf_out->extended_data, head->extended_data,
191                             s->buf_out->audio->nb_samples, 0, len, nb_channels,
192                             link->format);
193             s->buf_out->audio->nb_samples += len;
194
195             if (len == head->audio->nb_samples) {
196                 avfilter_unref_buffer(head);
197                 queue_pop(s);
198
199                 if (!s->root.next &&
200                     (ret = ff_request_frame(ctx->inputs[0])) < 0) {
201                     if (ret == AVERROR_EOF) {
202                         av_samples_set_silence(s->buf_out->extended_data,
203                                                s->buf_out->audio->nb_samples,
204                                                s->allocated_samples -
205                                                s->buf_out->audio->nb_samples,
206                                                nb_channels, link->format);
207                         s->buf_out->audio->nb_samples = s->allocated_samples;
208                         break;
209                     }
210                     return ret;
211                 }
212                 head = s->root.next->buf;
213             } else {
214                 buffer_offset(link, head, len);
215             }
216         }
217         buf_out = s->buf_out;
218         s->buf_out = NULL;
219     }
220     return ff_filter_frame(link, buf_out);
221 }
222
223 static int request_frame(AVFilterLink *outlink)
224 {
225     FifoContext *fifo = outlink->src->priv;
226     int ret = 0;
227
228     if (!fifo->root.next) {
229         if ((ret = ff_request_frame(outlink->src->inputs[0])) < 0)
230             return ret;
231         av_assert0(fifo->root.next);
232     }
233
234         if (outlink->request_samples) {
235             return return_audio_frame(outlink->src);
236         } else {
237         ret = ff_filter_frame(outlink, fifo->root.next->buf);
238             queue_pop(fifo);
239         }
240
241     return ret;
242 }
243
244 static const AVFilterPad avfilter_vf_fifo_inputs[] = {
245     {
246         .name             = "default",
247         .type             = AVMEDIA_TYPE_VIDEO,
248         .get_video_buffer = ff_null_get_video_buffer,
249         .filter_frame     = add_to_queue,
250         .min_perms        = AV_PERM_PRESERVE,
251     },
252     { NULL }
253 };
254
255 static const AVFilterPad avfilter_vf_fifo_outputs[] = {
256     {
257         .name          = "default",
258         .type          = AVMEDIA_TYPE_VIDEO,
259         .request_frame = request_frame,
260     },
261     { NULL }
262 };
263
264 AVFilter avfilter_vf_fifo = {
265     .name      = "fifo",
266     .description = NULL_IF_CONFIG_SMALL("Buffer input images and send them when they are requested."),
267
268     .init      = init,
269     .uninit    = uninit,
270
271     .priv_size = sizeof(FifoContext),
272
273     .inputs    = avfilter_vf_fifo_inputs,
274     .outputs   = avfilter_vf_fifo_outputs,
275 };
276
277 static const AVFilterPad avfilter_af_afifo_inputs[] = {
278     {
279         .name             = "default",
280         .type             = AVMEDIA_TYPE_AUDIO,
281         .get_audio_buffer = ff_null_get_audio_buffer,
282         .filter_frame     = add_to_queue,
283         .min_perms        = AV_PERM_PRESERVE,
284     },
285     { NULL }
286 };
287
288 static const AVFilterPad avfilter_af_afifo_outputs[] = {
289     {
290         .name          = "default",
291         .type          = AVMEDIA_TYPE_AUDIO,
292         .request_frame = request_frame,
293     },
294     { NULL }
295 };
296
297 AVFilter avfilter_af_afifo = {
298     .name        = "afifo",
299     .description = NULL_IF_CONFIG_SMALL("Buffer input frames and send them when they are requested."),
300
301     .init      = init,
302     .uninit    = uninit,
303
304     .priv_size = sizeof(FifoContext),
305
306     .inputs    = avfilter_af_afifo_inputs,
307     .outputs   = avfilter_af_afifo_outputs,
308 };