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1 | /* | ||
2 | * Copyright (c) 2011 Stefano Sabatini | ||
3 | * Copyright (c) 2011 Mina Nagy Zaki | ||
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 | * resampling audio filter | ||
25 | */ | ||
26 | |||
27 | #include "libavutil/avstring.h" | ||
28 | #include "libavutil/channel_layout.h" | ||
29 | #include "libavutil/downmix_info.h" | ||
30 | #include "libavutil/opt.h" | ||
31 | #include "libavutil/samplefmt.h" | ||
32 | #include "libavutil/avassert.h" | ||
33 | #include "libswresample/swresample.h" | ||
34 | #include "avfilter.h" | ||
35 | #include "audio.h" | ||
36 | #include "filters.h" | ||
37 | #include "formats.h" | ||
38 | |||
39 | typedef struct AResampleContext { | ||
40 | const AVClass *class; | ||
41 | int sample_rate_arg; | ||
42 | double ratio; | ||
43 | struct SwrContext *swr; | ||
44 | int64_t next_pts; | ||
45 | int more_data; | ||
46 | } AResampleContext; | ||
47 | |||
48 | 2340 | static av_cold int preinit(AVFilterContext *ctx) | |
49 | { | ||
50 | 2340 | AResampleContext *aresample = ctx->priv; | |
51 | |||
52 | 2340 | aresample->next_pts = AV_NOPTS_VALUE; | |
53 | 2340 | aresample->swr = swr_alloc(); | |
54 |
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2340 | if (!aresample->swr) |
55 | ✗ | return AVERROR(ENOMEM); | |
56 | |||
57 | 2340 | return 0; | |
58 | } | ||
59 | |||
60 | 2340 | static av_cold void uninit(AVFilterContext *ctx) | |
61 | { | ||
62 | 2340 | AResampleContext *aresample = ctx->priv; | |
63 | 2340 | swr_free(&aresample->swr); | |
64 | 2340 | } | |
65 | |||
66 | 1485 | static int query_formats(const AVFilterContext *ctx, | |
67 | AVFilterFormatsConfig **cfg_in, | ||
68 | AVFilterFormatsConfig **cfg_out) | ||
69 | { | ||
70 | 1485 | const AResampleContext *aresample = ctx->priv; | |
71 | enum AVSampleFormat out_format; | ||
72 | 1485 | AVChannelLayout out_layout = { 0 }; | |
73 | int64_t out_rate; | ||
74 | |||
75 | AVFilterFormats *in_formats, *out_formats; | ||
76 | AVFilterFormats *in_samplerates, *out_samplerates; | ||
77 | AVFilterChannelLayouts *in_layouts, *out_layouts; | ||
78 | int ret; | ||
79 | |||
80 |
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1485 | if (aresample->sample_rate_arg > 0) |
81 | 639 | av_opt_set_int(aresample->swr, "osr", aresample->sample_rate_arg, 0); | |
82 | 1485 | av_opt_get_sample_fmt(aresample->swr, "osf", 0, &out_format); | |
83 | 1485 | av_opt_get_int(aresample->swr, "osr", 0, &out_rate); | |
84 | |||
85 | 1485 | in_formats = ff_all_formats(AVMEDIA_TYPE_AUDIO); | |
86 |
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1485 | if ((ret = ff_formats_ref(in_formats, &cfg_in[0]->formats)) < 0) |
87 | ✗ | return ret; | |
88 | |||
89 | 1485 | in_samplerates = ff_all_samplerates(); | |
90 |
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1485 | if ((ret = ff_formats_ref(in_samplerates, &cfg_in[0]->samplerates)) < 0) |
91 | ✗ | return ret; | |
92 | |||
93 | 1485 | in_layouts = ff_all_channel_counts(); | |
94 |
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1485 | if ((ret = ff_channel_layouts_ref(in_layouts, &cfg_in[0]->channel_layouts)) < 0) |
95 | ✗ | return ret; | |
96 | |||
97 |
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1485 | if(out_rate > 0) { |
98 | 639 | int ratelist[] = { out_rate, -1 }; | |
99 | 639 | out_samplerates = ff_make_format_list(ratelist); | |
100 | } else { | ||
101 | 846 | out_samplerates = ff_all_samplerates(); | |
102 | } | ||
103 | |||
104 |
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1485 | if ((ret = ff_formats_ref(out_samplerates, &cfg_out[0]->samplerates)) < 0) |
105 | ✗ | return ret; | |
106 | |||
107 |
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1485 | if(out_format != AV_SAMPLE_FMT_NONE) { |
108 | ✗ | int formatlist[] = { out_format, -1 }; | |
109 | ✗ | out_formats = ff_make_format_list(formatlist); | |
110 | } else | ||
111 | 1485 | out_formats = ff_all_formats(AVMEDIA_TYPE_AUDIO); | |
112 |
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1485 | if ((ret = ff_formats_ref(out_formats, &cfg_out[0]->formats)) < 0) |
113 | ✗ | return ret; | |
114 | |||
115 | 1485 | av_opt_get_chlayout(aresample->swr, "ochl", 0, &out_layout); | |
116 |
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1485 | if (av_channel_layout_check(&out_layout)) { |
117 | ✗ | const AVChannelLayout layout_list[] = { out_layout, { 0 } }; | |
118 | ✗ | out_layouts = ff_make_channel_layout_list(layout_list); | |
119 | } else | ||
120 | 1485 | out_layouts = ff_all_channel_counts(); | |
121 | 1485 | av_channel_layout_uninit(&out_layout); | |
122 | |||
123 | 1485 | return ff_channel_layouts_ref(out_layouts, &cfg_out[0]->channel_layouts); | |
124 | } | ||
125 | |||
126 | #define SWR_CH_MAX 64 | ||
127 | |||
128 | 1485 | static int config_output(AVFilterLink *outlink) | |
129 | { | ||
130 | int ret; | ||
131 | 1485 | AVFilterContext *ctx = outlink->src; | |
132 | 1485 | AVFilterLink *inlink = ctx->inputs[0]; | |
133 | 1485 | AResampleContext *aresample = ctx->priv; | |
134 | 1485 | AVChannelLayout out_layout = { 0 }; | |
135 | int64_t out_rate; | ||
136 | const AVFrameSideData *sd; | ||
137 | enum AVSampleFormat out_format; | ||
138 | char inchl_buf[128], outchl_buf[128]; | ||
139 | |||
140 | 1485 | ret = swr_alloc_set_opts2(&aresample->swr, | |
141 | 1485 | &outlink->ch_layout, outlink->format, outlink->sample_rate, | |
142 | 1485 | &inlink->ch_layout, inlink->format, inlink->sample_rate, | |
143 | 0, ctx); | ||
144 |
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1485 | if (ret < 0) |
145 | ✗ | return ret; | |
146 | |||
147 | 1485 | sd = av_frame_side_data_get(inlink->side_data, inlink->nb_side_data, | |
148 | AV_FRAME_DATA_DOWNMIX_INFO); | ||
149 |
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1485 | if (sd) { |
150 | 5 | const AVDownmixInfo *di = (AVDownmixInfo *)sd->data; | |
151 | 5 | enum AVMatrixEncoding matrix_encoding = AV_MATRIX_ENCODING_NONE; | |
152 | double center_mix_level, surround_mix_level; | ||
153 | |||
154 |
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5 | switch (di->preferred_downmix_type) { |
155 | 1 | case AV_DOWNMIX_TYPE_LTRT: | |
156 | 1 | matrix_encoding = AV_MATRIX_ENCODING_DOLBY; | |
157 | 1 | center_mix_level = di->center_mix_level_ltrt; | |
158 | 1 | surround_mix_level = di->surround_mix_level_ltrt; | |
159 | 1 | break; | |
160 | 1 | case AV_DOWNMIX_TYPE_DPLII: | |
161 | 1 | matrix_encoding = AV_MATRIX_ENCODING_DPLII; | |
162 | 1 | center_mix_level = di->center_mix_level_ltrt; | |
163 | 1 | surround_mix_level = di->surround_mix_level_ltrt; | |
164 | 1 | break; | |
165 | 3 | default: | |
166 | 3 | center_mix_level = di->center_mix_level; | |
167 | 3 | surround_mix_level = di->surround_mix_level; | |
168 | 3 | break; | |
169 | } | ||
170 | |||
171 | 5 | av_log(ctx, AV_LOG_VERBOSE, "Mix levels: center %f - " | |
172 | "surround %f - lfe %f.\n", | ||
173 | 5 | center_mix_level, surround_mix_level, di->lfe_mix_level); | |
174 | |||
175 | 5 | av_opt_set_double(aresample->swr, "clev", center_mix_level, 0); | |
176 | 5 | av_opt_set_double(aresample->swr, "slev", surround_mix_level, 0); | |
177 | 5 | av_opt_set_double(aresample->swr, "lfe_mix_level", di->lfe_mix_level, 0); | |
178 | 5 | av_opt_set_int(aresample->swr, "matrix_encoding", matrix_encoding, 0); | |
179 | |||
180 |
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5 | if (av_channel_layout_compare(&outlink->ch_layout, &out_layout)) |
181 | 5 | av_frame_side_data_remove(&outlink->side_data, &outlink->nb_side_data, | |
182 | AV_FRAME_DATA_DOWNMIX_INFO); | ||
183 | } | ||
184 | |||
185 | 1485 | ret = swr_init(aresample->swr); | |
186 |
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1485 | if (ret < 0) |
187 | ✗ | return ret; | |
188 | |||
189 | 1485 | av_opt_get_int(aresample->swr, "osr", 0, &out_rate); | |
190 | 1485 | av_opt_get_chlayout(aresample->swr, "ochl", 0, &out_layout); | |
191 | 1485 | av_opt_get_sample_fmt(aresample->swr, "osf", 0, &out_format); | |
192 | 1485 | outlink->time_base = (AVRational) {1, out_rate}; | |
193 | |||
194 |
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1485 | av_assert0(outlink->sample_rate == out_rate); |
195 |
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1485 | av_assert0(!av_channel_layout_compare(&outlink->ch_layout, &out_layout)); |
196 |
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1485 | av_assert0(outlink->format == out_format); |
197 | |||
198 | 1485 | av_channel_layout_uninit(&out_layout); | |
199 | |||
200 | 1485 | aresample->ratio = (double)outlink->sample_rate / inlink->sample_rate; | |
201 | |||
202 | 1485 | av_channel_layout_describe(&inlink ->ch_layout, inchl_buf, sizeof(inchl_buf)); | |
203 | 1485 | av_channel_layout_describe(&outlink->ch_layout, outchl_buf, sizeof(outchl_buf)); | |
204 | |||
205 | 1485 | av_log(ctx, AV_LOG_VERBOSE, "ch:%d chl:%s fmt:%s r:%dHz -> ch:%d chl:%s fmt:%s r:%dHz\n", | |
206 | 1485 | inlink ->ch_layout.nb_channels, inchl_buf, av_get_sample_fmt_name(inlink->format), inlink->sample_rate, | |
207 | 1485 | outlink->ch_layout.nb_channels, outchl_buf, av_get_sample_fmt_name(outlink->format), outlink->sample_rate); | |
208 | 1485 | return 0; | |
209 | } | ||
210 | |||
211 | 212994 | static int filter_frame(AVFilterLink *inlink, AVFrame *insamplesref, AVFrame **outsamplesref_ret) | |
212 | { | ||
213 | 212994 | AVFilterContext *ctx = inlink->dst; | |
214 | 212994 | AResampleContext *aresample = ctx->priv; | |
215 | 212994 | const int n_in = insamplesref->nb_samples; | |
216 | int64_t delay; | ||
217 | 212994 | int n_out = n_in * aresample->ratio + 32; | |
218 | 212994 | AVFilterLink *const outlink = inlink->dst->outputs[0]; | |
219 | AVFrame *outsamplesref; | ||
220 | int ret; | ||
221 | |||
222 | 212994 | *outsamplesref_ret = NULL; | |
223 | 212994 | delay = swr_get_delay(aresample->swr, outlink->sample_rate); | |
224 |
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212994 | if (delay > 0) |
225 | 7740 | n_out += FFMIN(delay, FFMAX(4096, n_out)); | |
226 | |||
227 | 212994 | outsamplesref = ff_get_audio_buffer(outlink, n_out); | |
228 |
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212994 | if (!outsamplesref) |
229 | ✗ | return AVERROR(ENOMEM); | |
230 | |||
231 | 212994 | av_frame_copy_props(outsamplesref, insamplesref); | |
232 | 212994 | outsamplesref->format = outlink->format; | |
233 | 212994 | ret = av_channel_layout_copy(&outsamplesref->ch_layout, &outlink->ch_layout); | |
234 |
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212994 | if (ret < 0) { |
235 | ✗ | av_frame_free(&outsamplesref); | |
236 | ✗ | return ret; | |
237 | } | ||
238 | 212994 | outsamplesref->sample_rate = outlink->sample_rate; | |
239 | |||
240 |
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212994 | if (av_channel_layout_compare(&outsamplesref->ch_layout, &insamplesref->ch_layout)) |
241 | 534 | av_frame_side_data_remove_by_props(&outsamplesref->side_data, &outsamplesref->nb_side_data, | |
242 | AV_SIDE_DATA_PROP_CHANNEL_DEPENDENT); | ||
243 | |||
244 |
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212994 | if(insamplesref->pts != AV_NOPTS_VALUE) { |
245 | 212994 | int64_t inpts = av_rescale(insamplesref->pts, inlink->time_base.num * (int64_t)outlink->sample_rate * inlink->sample_rate, inlink->time_base.den); | |
246 | 212994 | int64_t outpts= swr_next_pts(aresample->swr, inpts); | |
247 | 212994 | aresample->next_pts = | |
248 |
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212994 | outsamplesref->pts = ROUNDED_DIV(outpts, inlink->sample_rate); |
249 | } else { | ||
250 | ✗ | outsamplesref->pts = AV_NOPTS_VALUE; | |
251 | } | ||
252 | 212994 | n_out = swr_convert(aresample->swr, outsamplesref->extended_data, n_out, | |
253 | 212994 | (void *)insamplesref->extended_data, n_in); | |
254 |
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212994 | if (n_out <= 0) { |
255 | ✗ | av_frame_free(&outsamplesref); | |
256 | ✗ | return 0; | |
257 | } | ||
258 | |||
259 | 212994 | aresample->more_data = outsamplesref->nb_samples == n_out; // Indicate that there is probably more data in our buffers | |
260 | |||
261 | 212994 | outsamplesref->nb_samples = n_out; | |
262 | |||
263 | 212994 | *outsamplesref_ret = outsamplesref; | |
264 | 212994 | return 1; | |
265 | } | ||
266 | |||
267 | 2036 | static int flush_frame(AVFilterLink *outlink, int final, AVFrame **outsamplesref_ret) | |
268 | { | ||
269 | 2036 | AVFilterContext *ctx = outlink->src; | |
270 | 2036 | AResampleContext *aresample = ctx->priv; | |
271 | 2036 | AVFilterLink *const inlink = outlink->src->inputs[0]; | |
272 | AVFrame *outsamplesref; | ||
273 | 2036 | int n_out = 4096; | |
274 | int64_t pts; | ||
275 | |||
276 | 2036 | outsamplesref = ff_get_audio_buffer(outlink, n_out); | |
277 | 2036 | *outsamplesref_ret = outsamplesref; | |
278 |
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2036 | if (!outsamplesref) |
279 | ✗ | return AVERROR(ENOMEM); | |
280 | |||
281 | 2036 | pts = swr_next_pts(aresample->swr, INT64_MIN); | |
282 |
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2036 | pts = ROUNDED_DIV(pts, inlink->sample_rate); |
283 | |||
284 |
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2036 | n_out = swr_convert(aresample->swr, outsamplesref->extended_data, n_out, final ? NULL : (void*)outsamplesref->extended_data, 0); |
285 |
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2036 | if (n_out <= 0) { |
286 | 1278 | av_frame_free(&outsamplesref); | |
287 | 1278 | return n_out; | |
288 | } | ||
289 | |||
290 | 758 | outsamplesref->sample_rate = outlink->sample_rate; | |
291 | 758 | outsamplesref->nb_samples = n_out; | |
292 | |||
293 | 758 | outsamplesref->pts = pts; | |
294 | |||
295 | 758 | return 1; | |
296 | } | ||
297 | |||
298 | 428086 | static int activate(AVFilterContext *ctx) | |
299 | { | ||
300 | 428086 | AVFilterLink *inlink = ctx->inputs[0]; | |
301 | 428086 | AVFilterLink *outlink = ctx->outputs[0]; | |
302 | 428086 | AResampleContext *aresample = ctx->priv; | |
303 | AVFrame *frame; | ||
304 | 428086 | int ret = 0, status; | |
305 | int64_t pts; | ||
306 | |||
307 |
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428086 | FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
308 | |||
309 | // First try to get data from the internal buffers | ||
310 |
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426987 | if (aresample->more_data) { |
311 | AVFrame *outsamplesref; | ||
312 | |||
313 | 127 | ret = flush_frame(outlink, 0, &outsamplesref); | |
314 |
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127 | if (ret < 0) |
315 | 123 | return ret; | |
316 |
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127 | if (ret > 0) |
317 | 123 | return ff_filter_frame(outlink, outsamplesref); | |
318 | } | ||
319 | 426864 | aresample->more_data = 0; | |
320 | |||
321 | // Then consume frames from inlink | ||
322 |
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426864 | while ((ret = ff_inlink_consume_frame(inlink, &frame))) { |
323 | AVFrame *outsamplesref; | ||
324 |
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212994 | if (ret < 0) |
325 | 212994 | return ret; | |
326 | |||
327 | 212994 | ret = filter_frame(inlink, frame, &outsamplesref); | |
328 | 212994 | av_frame_free(&frame); | |
329 |
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212994 | if (ret < 0) |
330 | ✗ | return ret; | |
331 |
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212994 | if (ret > 0) |
332 | 212994 | return ff_filter_frame(outlink, outsamplesref); | |
333 | } | ||
334 | |||
335 | // If we hit the end flush | ||
336 |
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213870 | if (ff_inlink_acknowledge_status(inlink, &status, &pts)) { |
337 | AVFrame *outsamplesref; | ||
338 | |||
339 | 1909 | ret = flush_frame(outlink, 1, &outsamplesref); | |
340 |
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1909 | if (ret < 0) |
341 | ✗ | return ret; | |
342 |
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1909 | if (ret > 0) |
343 | 635 | return ff_filter_frame(outlink, outsamplesref); | |
344 | 1274 | ff_outlink_set_status(outlink, status, aresample->next_pts); | |
345 | 1274 | return 0; | |
346 | } | ||
347 | |||
348 | // If not, request more data from the input | ||
349 |
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211961 | FF_FILTER_FORWARD_WANTED(outlink, inlink); |
350 | |||
351 | ✗ | return FFERROR_NOT_READY; | |
352 | } | ||
353 | |||
354 | ✗ | static const AVClass *resample_child_class_iterate(void **iter) | |
355 | { | ||
356 | ✗ | const AVClass *c = *iter ? NULL : swr_get_class(); | |
357 | ✗ | *iter = (void*)(uintptr_t)c; | |
358 | ✗ | return c; | |
359 | } | ||
360 | |||
361 | 6685 | static void *resample_child_next(void *obj, void *prev) | |
362 | { | ||
363 | 6685 | AResampleContext *s = obj; | |
364 |
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6685 | return prev ? NULL : s->swr; |
365 | } | ||
366 | |||
367 | #define OFFSET(x) offsetof(AResampleContext, x) | ||
368 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
369 | |||
370 | static const AVOption options[] = { | ||
371 | {"sample_rate", NULL, OFFSET(sample_rate_arg), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS }, | ||
372 | {NULL} | ||
373 | }; | ||
374 | |||
375 | static const AVClass aresample_class = { | ||
376 | .class_name = "aresample", | ||
377 | .item_name = av_default_item_name, | ||
378 | .option = options, | ||
379 | .version = LIBAVUTIL_VERSION_INT, | ||
380 | .child_class_iterate = resample_child_class_iterate, | ||
381 | .child_next = resample_child_next, | ||
382 | }; | ||
383 | |||
384 | static const AVFilterPad aresample_outputs[] = { | ||
385 | { | ||
386 | .name = "default", | ||
387 | .config_props = config_output, | ||
388 | .type = AVMEDIA_TYPE_AUDIO, | ||
389 | }, | ||
390 | }; | ||
391 | |||
392 | const FFFilter ff_af_aresample = { | ||
393 | .p.name = "aresample", | ||
394 | .p.description = NULL_IF_CONFIG_SMALL("Resample audio data."), | ||
395 | .p.priv_class = &aresample_class, | ||
396 | .preinit = preinit, | ||
397 | .activate = activate, | ||
398 | .uninit = uninit, | ||
399 | .priv_size = sizeof(AResampleContext), | ||
400 | FILTER_INPUTS(ff_audio_default_filterpad), | ||
401 | FILTER_OUTPUTS(aresample_outputs), | ||
402 | FILTER_QUERY_FUNC2(query_formats), | ||
403 | }; | ||
404 |