Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 | AVFrame *frame; | |
39 | struct Buf *next; | |
40 | } Buf; | |
41 | ||
42 | typedef struct FifoContext { | |
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 | AVFrame *out; | |
51 | int allocated_samples; ///< number of samples out was allocated for | |
52 | } FifoContext; | |
53 | ||
54 | static av_cold int init(AVFilterContext *ctx) | |
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 | av_frame_free(&buf->frame); | |
70 | av_free(buf); | |
71 | } | |
72 | ||
73 | av_frame_free(&fifo->out); | |
74 | } | |
75 | ||
76 | static int add_to_queue(AVFilterLink *inlink, AVFrame *frame) | |
77 | { | |
78 | FifoContext *fifo = inlink->dst->priv; | |
79 | ||
80 | fifo->last->next = av_mallocz(sizeof(Buf)); | |
81 | if (!fifo->last->next) { | |
82 | av_frame_free(&frame); | |
83 | return AVERROR(ENOMEM); | |
84 | } | |
85 | ||
86 | fifo->last = fifo->last->next; | |
87 | fifo->last->frame = frame; | |
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, AVFrame *frame, | |
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(frame->nb_samples > offset); | |
114 | ||
115 | for (i = 0; i < planes; i++) | |
116 | frame->extended_data[i] += block_align * offset; | |
117 | if (frame->data != frame->extended_data) | |
118 | memcpy(frame->data, frame->extended_data, | |
119 | FFMIN(planes, FF_ARRAY_ELEMS(frame->data)) * sizeof(*frame->data)); | |
120 | frame->linesize[0] -= block_align*offset; | |
121 | frame->nb_samples -= offset; | |
122 | ||
123 | if (frame->pts != AV_NOPTS_VALUE) { | |
124 | frame->pts += av_rescale_q(offset, (AVRational){1, link->sample_rate}, | |
125 | link->time_base); | |
126 | } | |
127 | } | |
128 | ||
129 | static int calc_ptr_alignment(AVFrame *frame) | |
130 | { | |
131 | int planes = av_sample_fmt_is_planar(frame->format) ? | |
132 | av_get_channel_layout_nb_channels(frame->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)frame->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 | AVFrame *head = s->root.next ? s->root.next->frame : NULL; | |
151 | AVFrame *out; | |
152 | int ret; | |
153 | ||
154 | /* if head is NULL then we're flushing the remaining samples in out */ | |
155 | if (!head && !s->out) | |
156 | return AVERROR_EOF; | |
157 | ||
158 | if (!s->out && | |
159 | head->nb_samples >= link->request_samples && | |
160 | calc_ptr_alignment(head) >= 32) { | |
161 | if (head->nb_samples == link->request_samples) { | |
162 | out = head; | |
163 | queue_pop(s); | |
164 | } else { | |
165 | out = av_frame_clone(head); | |
166 | if (!out) | |
167 | return AVERROR(ENOMEM); | |
168 | ||
169 | out->nb_samples = link->request_samples; | |
170 | buffer_offset(link, head, link->request_samples); | |
171 | } | |
172 | } else { | |
173 | int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout); | |
174 | ||
175 | if (!s->out) { | |
176 | s->out = ff_get_audio_buffer(link, link->request_samples); | |
177 | if (!s->out) | |
178 | return AVERROR(ENOMEM); | |
179 | ||
180 | s->out->nb_samples = 0; | |
181 | s->out->pts = head->pts; | |
182 | s->allocated_samples = link->request_samples; | |
183 | } else if (link->request_samples != s->allocated_samples) { | |
184 | av_log(ctx, AV_LOG_ERROR, "request_samples changed before the " | |
185 | "buffer was returned.\n"); | |
186 | return AVERROR(EINVAL); | |
187 | } | |
188 | ||
189 | while (s->out->nb_samples < s->allocated_samples) { | |
190 | int len; | |
191 | ||
192 | if (!s->root.next) { | |
193 | ret = ff_request_frame(ctx->inputs[0]); | |
194 | if (ret == AVERROR_EOF) { | |
195 | av_samples_set_silence(s->out->extended_data, | |
196 | s->out->nb_samples, | |
197 | s->allocated_samples - | |
198 | s->out->nb_samples, | |
199 | nb_channels, link->format); | |
200 | s->out->nb_samples = s->allocated_samples; | |
201 | break; | |
202 | } else if (ret < 0) | |
203 | return ret; | |
204 | av_assert0(s->root.next); // If ff_request_frame() succeeded then we should have a frame | |
205 | } | |
206 | head = s->root.next->frame; | |
207 | ||
208 | len = FFMIN(s->allocated_samples - s->out->nb_samples, | |
209 | head->nb_samples); | |
210 | ||
211 | av_samples_copy(s->out->extended_data, head->extended_data, | |
212 | s->out->nb_samples, 0, len, nb_channels, | |
213 | link->format); | |
214 | s->out->nb_samples += len; | |
215 | ||
216 | if (len == head->nb_samples) { | |
217 | av_frame_free(&head); | |
218 | queue_pop(s); | |
219 | } else { | |
220 | buffer_offset(link, head, len); | |
221 | } | |
222 | } | |
223 | out = s->out; | |
224 | s->out = NULL; | |
225 | } | |
226 | return ff_filter_frame(link, out); | |
227 | } | |
228 | ||
229 | static int request_frame(AVFilterLink *outlink) | |
230 | { | |
231 | FifoContext *fifo = outlink->src->priv; | |
232 | int ret = 0; | |
233 | ||
234 | if (!fifo->root.next) { | |
235 | if ((ret = ff_request_frame(outlink->src->inputs[0])) < 0) { | |
236 | if (ret == AVERROR_EOF && outlink->request_samples) | |
237 | return return_audio_frame(outlink->src); | |
238 | return ret; | |
239 | } | |
240 | av_assert0(fifo->root.next); | |
241 | } | |
242 | ||
243 | if (outlink->request_samples) { | |
244 | return return_audio_frame(outlink->src); | |
245 | } else { | |
246 | ret = ff_filter_frame(outlink, fifo->root.next->frame); | |
247 | queue_pop(fifo); | |
248 | } | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
253 | static const AVFilterPad avfilter_vf_fifo_inputs[] = { | |
254 | { | |
255 | .name = "default", | |
256 | .type = AVMEDIA_TYPE_VIDEO, | |
257 | .filter_frame = add_to_queue, | |
258 | }, | |
259 | { NULL } | |
260 | }; | |
261 | ||
262 | static const AVFilterPad avfilter_vf_fifo_outputs[] = { | |
263 | { | |
264 | .name = "default", | |
265 | .type = AVMEDIA_TYPE_VIDEO, | |
266 | .request_frame = request_frame, | |
267 | }, | |
268 | { NULL } | |
269 | }; | |
270 | ||
271 | AVFilter ff_vf_fifo = { | |
272 | .name = "fifo", | |
273 | .description = NULL_IF_CONFIG_SMALL("Buffer input images and send them when they are requested."), | |
274 | ||
275 | .init = init, | |
276 | .uninit = uninit, | |
277 | ||
278 | .priv_size = sizeof(FifoContext), | |
279 | ||
280 | .inputs = avfilter_vf_fifo_inputs, | |
281 | .outputs = avfilter_vf_fifo_outputs, | |
282 | }; | |
283 | ||
284 | static const AVFilterPad avfilter_af_afifo_inputs[] = { | |
285 | { | |
286 | .name = "default", | |
287 | .type = AVMEDIA_TYPE_AUDIO, | |
288 | .filter_frame = add_to_queue, | |
289 | }, | |
290 | { NULL } | |
291 | }; | |
292 | ||
293 | static const AVFilterPad avfilter_af_afifo_outputs[] = { | |
294 | { | |
295 | .name = "default", | |
296 | .type = AVMEDIA_TYPE_AUDIO, | |
297 | .request_frame = request_frame, | |
298 | }, | |
299 | { NULL } | |
300 | }; | |
301 | ||
302 | AVFilter ff_af_afifo = { | |
303 | .name = "afifo", | |
304 | .description = NULL_IF_CONFIG_SMALL("Buffer input frames and send them when they are requested."), | |
305 | ||
306 | .init = init, | |
307 | .uninit = uninit, | |
308 | ||
309 | .priv_size = sizeof(FifoContext), | |
310 | ||
311 | .inputs = avfilter_af_afifo_inputs, | |
312 | .outputs = avfilter_af_afifo_outputs, | |
313 | }; |