x86: lavr: add SSE2/AVX dither_int_to_float()
[libav.git] / libavresample / utils.c
CommitLineData
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1/*
2 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
1d9c2dc8 21#include "libavutil/common.h"
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22#include "libavutil/dict.h"
23#include "libavutil/error.h"
24#include "libavutil/log.h"
25#include "libavutil/mem.h"
26#include "libavutil/opt.h"
27
28#include "avresample.h"
c8af852b 29#include "internal.h"
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30#include "audio_data.h"
31#include "audio_convert.h"
32#include "audio_mix.h"
33#include "resample.h"
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34
35int avresample_open(AVAudioResampleContext *avr)
36{
37 int ret;
38
39 /* set channel mixing parameters */
40 avr->in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
41 if (avr->in_channels <= 0 || avr->in_channels > AVRESAMPLE_MAX_CHANNELS) {
42 av_log(avr, AV_LOG_ERROR, "Invalid input channel layout: %"PRIu64"\n",
43 avr->in_channel_layout);
44 return AVERROR(EINVAL);
45 }
46 avr->out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout);
47 if (avr->out_channels <= 0 || avr->out_channels > AVRESAMPLE_MAX_CHANNELS) {
48 av_log(avr, AV_LOG_ERROR, "Invalid output channel layout: %"PRIu64"\n",
49 avr->out_channel_layout);
50 return AVERROR(EINVAL);
51 }
52 avr->resample_channels = FFMIN(avr->in_channels, avr->out_channels);
53 avr->downmix_needed = avr->in_channels > avr->out_channels;
54 avr->upmix_needed = avr->out_channels > avr->in_channels ||
42b5688d 55 (!avr->downmix_needed && (avr->mix_matrix ||
8821ae64 56 avr->in_channel_layout != avr->out_channel_layout));
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57 avr->mixing_needed = avr->downmix_needed || avr->upmix_needed;
58
59 /* set resampling parameters */
60 avr->resample_needed = avr->in_sample_rate != avr->out_sample_rate ||
61 avr->force_resampling;
62
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63 /* select internal sample format if not specified by the user */
64 if (avr->internal_sample_fmt == AV_SAMPLE_FMT_NONE &&
65 (avr->mixing_needed || avr->resample_needed)) {
66 enum AVSampleFormat in_fmt = av_get_planar_sample_fmt(avr->in_sample_fmt);
67 enum AVSampleFormat out_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt);
68 int max_bps = FFMAX(av_get_bytes_per_sample(in_fmt),
69 av_get_bytes_per_sample(out_fmt));
64103976 70 if (max_bps <= 2) {
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71 avr->internal_sample_fmt = AV_SAMPLE_FMT_S16P;
72 } else if (avr->mixing_needed) {
73 avr->internal_sample_fmt = AV_SAMPLE_FMT_FLTP;
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74 } else {
75 if (max_bps <= 4) {
76 if (in_fmt == AV_SAMPLE_FMT_S32P ||
77 out_fmt == AV_SAMPLE_FMT_S32P) {
78 if (in_fmt == AV_SAMPLE_FMT_FLTP ||
79 out_fmt == AV_SAMPLE_FMT_FLTP) {
80 /* if one is s32 and the other is flt, use dbl */
81 avr->internal_sample_fmt = AV_SAMPLE_FMT_DBLP;
82 } else {
83 /* if one is s32 and the other is s32, s16, or u8, use s32 */
84 avr->internal_sample_fmt = AV_SAMPLE_FMT_S32P;
85 }
86 } else {
87 /* if one is flt and the other is flt, s16 or u8, use flt */
88 avr->internal_sample_fmt = AV_SAMPLE_FMT_FLTP;
89 }
90 } else {
91 /* if either is dbl, use dbl */
92 avr->internal_sample_fmt = AV_SAMPLE_FMT_DBLP;
93 }
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94 }
95 av_log(avr, AV_LOG_DEBUG, "Using %s as internal sample format\n",
96 av_get_sample_fmt_name(avr->internal_sample_fmt));
c8af852b 97 }
8ca08066 98
074a00d1 99 /* treat all mono as planar for easier comparison */
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100 if (avr->in_channels == 1)
101 avr->in_sample_fmt = av_get_planar_sample_fmt(avr->in_sample_fmt);
102 if (avr->out_channels == 1)
103 avr->out_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt);
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104
105 /* we may need to add an extra conversion in order to remap channels if
106 the output format is not planar */
107 if (avr->use_channel_map && !avr->mixing_needed && !avr->resample_needed &&
108 !av_sample_fmt_is_planar(avr->out_sample_fmt)) {
109 avr->internal_sample_fmt = av_get_planar_sample_fmt(avr->out_sample_fmt);
110 }
111
112 /* set sample format conversion parameters */
c8af852b 113 if (avr->resample_needed || avr->mixing_needed)
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114 avr->in_convert_needed = avr->in_sample_fmt != avr->internal_sample_fmt;
115 else
116 avr->in_convert_needed = avr->use_channel_map &&
117 !av_sample_fmt_is_planar(avr->out_sample_fmt);
118
119 if (avr->resample_needed || avr->mixing_needed || avr->in_convert_needed)
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120 avr->out_convert_needed = avr->internal_sample_fmt != avr->out_sample_fmt;
121 else
122 avr->out_convert_needed = avr->in_sample_fmt != avr->out_sample_fmt;
123
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124 avr->in_copy_needed = !avr->in_convert_needed && (avr->mixing_needed ||
125 (avr->use_channel_map && avr->resample_needed));
126
127 if (avr->use_channel_map) {
128 if (avr->in_copy_needed) {
129 avr->remap_point = REMAP_IN_COPY;
130 av_dlog(avr, "remap channels during in_copy\n");
131 } else if (avr->in_convert_needed) {
132 avr->remap_point = REMAP_IN_CONVERT;
133 av_dlog(avr, "remap channels during in_convert\n");
134 } else if (avr->out_convert_needed) {
135 avr->remap_point = REMAP_OUT_CONVERT;
136 av_dlog(avr, "remap channels during out_convert\n");
137 } else {
138 avr->remap_point = REMAP_OUT_COPY;
139 av_dlog(avr, "remap channels during out_copy\n");
140 }
141
142#ifdef DEBUG
143 {
144 int ch;
145 av_dlog(avr, "output map: ");
146 if (avr->ch_map_info.do_remap)
147 for (ch = 0; ch < avr->in_channels; ch++)
148 av_dlog(avr, " % 2d", avr->ch_map_info.channel_map[ch]);
149 else
150 av_dlog(avr, "n/a");
151 av_dlog(avr, "\n");
152 av_dlog(avr, "copy map: ");
153 if (avr->ch_map_info.do_copy)
154 for (ch = 0; ch < avr->in_channels; ch++)
155 av_dlog(avr, " % 2d", avr->ch_map_info.channel_copy[ch]);
156 else
157 av_dlog(avr, "n/a");
158 av_dlog(avr, "\n");
159 av_dlog(avr, "zero map: ");
160 if (avr->ch_map_info.do_zero)
161 for (ch = 0; ch < avr->in_channels; ch++)
162 av_dlog(avr, " % 2d", avr->ch_map_info.channel_zero[ch]);
163 else
164 av_dlog(avr, "n/a");
165 av_dlog(avr, "\n");
166 av_dlog(avr, "input map: ");
167 for (ch = 0; ch < avr->in_channels; ch++)
168 av_dlog(avr, " % 2d", avr->ch_map_info.input_map[ch]);
169 av_dlog(avr, "\n");
170 }
171#endif
172 } else
173 avr->remap_point = REMAP_NONE;
174
c8af852b 175 /* allocate buffers */
074a00d1 176 if (avr->in_copy_needed || avr->in_convert_needed) {
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177 avr->in_buffer = ff_audio_data_alloc(FFMAX(avr->in_channels, avr->out_channels),
178 0, avr->internal_sample_fmt,
179 "in_buffer");
180 if (!avr->in_buffer) {
181 ret = AVERROR(EINVAL);
182 goto error;
183 }
184 }
185 if (avr->resample_needed) {
186 avr->resample_out_buffer = ff_audio_data_alloc(avr->out_channels,
187 0, avr->internal_sample_fmt,
188 "resample_out_buffer");
189 if (!avr->resample_out_buffer) {
190 ret = AVERROR(EINVAL);
191 goto error;
192 }
193 }
194 if (avr->out_convert_needed) {
195 avr->out_buffer = ff_audio_data_alloc(avr->out_channels, 0,
196 avr->out_sample_fmt, "out_buffer");
197 if (!avr->out_buffer) {
198 ret = AVERROR(EINVAL);
199 goto error;
200 }
201 }
202 avr->out_fifo = av_audio_fifo_alloc(avr->out_sample_fmt, avr->out_channels,
203 1024);
204 if (!avr->out_fifo) {
205 ret = AVERROR(ENOMEM);
206 goto error;
207 }
208
209 /* setup contexts */
210 if (avr->in_convert_needed) {
211 avr->ac_in = ff_audio_convert_alloc(avr, avr->internal_sample_fmt,
b2fe6756 212 avr->in_sample_fmt, avr->in_channels,
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213 avr->in_sample_rate,
214 avr->remap_point == REMAP_IN_CONVERT);
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215 if (!avr->ac_in) {
216 ret = AVERROR(ENOMEM);
217 goto error;
218 }
219 }
220 if (avr->out_convert_needed) {
221 enum AVSampleFormat src_fmt;
222 if (avr->in_convert_needed)
223 src_fmt = avr->internal_sample_fmt;
224 else
225 src_fmt = avr->in_sample_fmt;
226 avr->ac_out = ff_audio_convert_alloc(avr, avr->out_sample_fmt, src_fmt,
b2fe6756 227 avr->out_channels,
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228 avr->out_sample_rate,
229 avr->remap_point == REMAP_OUT_CONVERT);
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230 if (!avr->ac_out) {
231 ret = AVERROR(ENOMEM);
232 goto error;
233 }
234 }
235 if (avr->resample_needed) {
236 avr->resample = ff_audio_resample_init(avr);
237 if (!avr->resample) {
238 ret = AVERROR(ENOMEM);
239 goto error;
240 }
241 }
242 if (avr->mixing_needed) {
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243 avr->am = ff_audio_mix_alloc(avr);
244 if (!avr->am) {
245 ret = AVERROR(ENOMEM);
c8af852b 246 goto error;
14758e32 247 }
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248 }
249
250 return 0;
251
252error:
253 avresample_close(avr);
254 return ret;
255}
256
257void avresample_close(AVAudioResampleContext *avr)
258{
259 ff_audio_data_free(&avr->in_buffer);
260 ff_audio_data_free(&avr->resample_out_buffer);
261 ff_audio_data_free(&avr->out_buffer);
262 av_audio_fifo_free(avr->out_fifo);
263 avr->out_fifo = NULL;
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264 ff_audio_convert_free(&avr->ac_in);
265 ff_audio_convert_free(&avr->ac_out);
c8af852b 266 ff_audio_resample_free(&avr->resample);
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267 ff_audio_mix_free(&avr->am);
268 av_freep(&avr->mix_matrix);
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269
270 avr->use_channel_map = 0;
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271}
272
273void avresample_free(AVAudioResampleContext **avr)
274{
275 if (!*avr)
276 return;
277 avresample_close(*avr);
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278 av_opt_free(*avr);
279 av_freep(avr);
280}
281
282static int handle_buffered_output(AVAudioResampleContext *avr,
283 AudioData *output, AudioData *converted)
284{
285 int ret;
286
287 if (!output || av_audio_fifo_size(avr->out_fifo) > 0 ||
288 (converted && output->allocated_samples < converted->nb_samples)) {
289 if (converted) {
290 /* if there are any samples in the output FIFO or if the
291 user-supplied output buffer is not large enough for all samples,
292 we add to the output FIFO */
293 av_dlog(avr, "[FIFO] add %s to out_fifo\n", converted->name);
294 ret = ff_audio_data_add_to_fifo(avr->out_fifo, converted, 0,
295 converted->nb_samples);
296 if (ret < 0)
297 return ret;
298 }
299
300 /* if the user specified an output buffer, read samples from the output
301 FIFO to the user output */
302 if (output && output->allocated_samples > 0) {
303 av_dlog(avr, "[FIFO] read from out_fifo to output\n");
304 av_dlog(avr, "[end conversion]\n");
305 return ff_audio_data_read_from_fifo(avr->out_fifo, output,
306 output->allocated_samples);
307 }
308 } else if (converted) {
309 /* copy directly to output if it is large enough or there is not any
310 data in the output FIFO */
311 av_dlog(avr, "[copy] %s to output\n", converted->name);
312 output->nb_samples = 0;
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313 ret = ff_audio_data_copy(output, converted,
314 avr->remap_point == REMAP_OUT_COPY ?
315 &avr->ch_map_info : NULL);
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316 if (ret < 0)
317 return ret;
318 av_dlog(avr, "[end conversion]\n");
319 return output->nb_samples;
320 }
321 av_dlog(avr, "[end conversion]\n");
322 return 0;
323}
324
2f096bb1 325int attribute_align_arg avresample_convert(AVAudioResampleContext *avr,
e7ba5b1d
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326 uint8_t **output, int out_plane_size,
327 int out_samples, uint8_t **input,
2f096bb1 328 int in_plane_size, int in_samples)
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329{
330 AudioData input_buffer;
331 AudioData output_buffer;
332 AudioData *current_buffer;
02738792 333 int ret, direct_output;
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334
335 /* reset internal buffers */
336 if (avr->in_buffer) {
337 avr->in_buffer->nb_samples = 0;
338 ff_audio_data_set_channels(avr->in_buffer,
339 avr->in_buffer->allocated_channels);
340 }
341 if (avr->resample_out_buffer) {
342 avr->resample_out_buffer->nb_samples = 0;
343 ff_audio_data_set_channels(avr->resample_out_buffer,
344 avr->resample_out_buffer->allocated_channels);
345 }
346 if (avr->out_buffer) {
347 avr->out_buffer->nb_samples = 0;
348 ff_audio_data_set_channels(avr->out_buffer,
349 avr->out_buffer->allocated_channels);
350 }
351
352 av_dlog(avr, "[start conversion]\n");
353
354 /* initialize output_buffer with output data */
02738792 355 direct_output = output && av_audio_fifo_size(avr->out_fifo) == 0;
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356 if (output) {
357 ret = ff_audio_data_init(&output_buffer, output, out_plane_size,
358 avr->out_channels, out_samples,
359 avr->out_sample_fmt, 0, "output");
360 if (ret < 0)
361 return ret;
362 output_buffer.nb_samples = 0;
363 }
364
365 if (input) {
366 /* initialize input_buffer with input data */
367 ret = ff_audio_data_init(&input_buffer, input, in_plane_size,
368 avr->in_channels, in_samples,
369 avr->in_sample_fmt, 1, "input");
370 if (ret < 0)
371 return ret;
372 current_buffer = &input_buffer;
373
374 if (avr->upmix_needed && !avr->in_convert_needed && !avr->resample_needed &&
02738792 375 !avr->out_convert_needed && direct_output && out_samples >= in_samples) {
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376 /* in some rare cases we can copy input to output and upmix
377 directly in the output buffer */
378 av_dlog(avr, "[copy] %s to output\n", current_buffer->name);
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379 ret = ff_audio_data_copy(&output_buffer, current_buffer,
380 avr->remap_point == REMAP_OUT_COPY ?
381 &avr->ch_map_info : NULL);
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382 if (ret < 0)
383 return ret;
384 current_buffer = &output_buffer;
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385 } else if (avr->remap_point == REMAP_OUT_COPY &&
386 (!direct_output || out_samples < in_samples)) {
387 /* if remapping channels during output copy, we may need to
388 * use an intermediate buffer in order to remap before adding
389 * samples to the output fifo */
390 av_dlog(avr, "[copy] %s to out_buffer\n", current_buffer->name);
391 ret = ff_audio_data_copy(avr->out_buffer, current_buffer,
392 &avr->ch_map_info);
393 if (ret < 0)
394 return ret;
395 current_buffer = avr->out_buffer;
396 } else if (avr->in_copy_needed || avr->in_convert_needed) {
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397 /* if needed, copy or convert input to in_buffer, and downmix if
398 applicable */
399 if (avr->in_convert_needed) {
400 ret = ff_audio_data_realloc(avr->in_buffer,
401 current_buffer->nb_samples);
402 if (ret < 0)
403 return ret;
404 av_dlog(avr, "[convert] %s to in_buffer\n", current_buffer->name);
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405 ret = ff_audio_convert(avr->ac_in, avr->in_buffer,
406 current_buffer);
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407 if (ret < 0)
408 return ret;
409 } else {
410 av_dlog(avr, "[copy] %s to in_buffer\n", current_buffer->name);
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411 ret = ff_audio_data_copy(avr->in_buffer, current_buffer,
412 avr->remap_point == REMAP_IN_COPY ?
413 &avr->ch_map_info : NULL);
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414 if (ret < 0)
415 return ret;
416 }
417 ff_audio_data_set_channels(avr->in_buffer, avr->in_channels);
418 if (avr->downmix_needed) {
419 av_dlog(avr, "[downmix] in_buffer\n");
420 ret = ff_audio_mix(avr->am, avr->in_buffer);
421 if (ret < 0)
422 return ret;
423 }
424 current_buffer = avr->in_buffer;
425 }
426 } else {
427 /* flush resampling buffer and/or output FIFO if input is NULL */
428 if (!avr->resample_needed)
429 return handle_buffered_output(avr, output ? &output_buffer : NULL,
430 NULL);
431 current_buffer = NULL;
432 }
433
434 if (avr->resample_needed) {
435 AudioData *resample_out;
c8af852b 436
02738792 437 if (!avr->out_convert_needed && direct_output && out_samples > 0)
c8af852b
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438 resample_out = &output_buffer;
439 else
440 resample_out = avr->resample_out_buffer;
441 av_dlog(avr, "[resample] %s to %s\n", current_buffer->name,
442 resample_out->name);
443 ret = ff_audio_resample(avr->resample, resample_out,
1d86aa8b 444 current_buffer);
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445 if (ret < 0)
446 return ret;
447
448 /* if resampling did not produce any samples, just return 0 */
449 if (resample_out->nb_samples == 0) {
450 av_dlog(avr, "[end conversion]\n");
451 return 0;
452 }
453
454 current_buffer = resample_out;
455 }
456
457 if (avr->upmix_needed) {
458 av_dlog(avr, "[upmix] %s\n", current_buffer->name);
459 ret = ff_audio_mix(avr->am, current_buffer);
460 if (ret < 0)
461 return ret;
462 }
463
464 /* if we resampled or upmixed directly to output, return here */
465 if (current_buffer == &output_buffer) {
466 av_dlog(avr, "[end conversion]\n");
467 return current_buffer->nb_samples;
468 }
469
470 if (avr->out_convert_needed) {
02738792 471 if (direct_output && out_samples >= current_buffer->nb_samples) {
c8af852b
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472 /* convert directly to output */
473 av_dlog(avr, "[convert] %s to output\n", current_buffer->name);
7f534d11 474 ret = ff_audio_convert(avr->ac_out, &output_buffer, current_buffer);
c8af852b
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475 if (ret < 0)
476 return ret;
477
478 av_dlog(avr, "[end conversion]\n");
479 return output_buffer.nb_samples;
480 } else {
481 ret = ff_audio_data_realloc(avr->out_buffer,
482 current_buffer->nb_samples);
483 if (ret < 0)
484 return ret;
485 av_dlog(avr, "[convert] %s to out_buffer\n", current_buffer->name);
486 ret = ff_audio_convert(avr->ac_out, avr->out_buffer,
7f534d11 487 current_buffer);
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488 if (ret < 0)
489 return ret;
490 current_buffer = avr->out_buffer;
491 }
492 }
493
96843413
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494 return handle_buffered_output(avr, output ? &output_buffer : NULL,
495 current_buffer);
c8af852b
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496}
497
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498int avresample_get_matrix(AVAudioResampleContext *avr, double *matrix,
499 int stride)
500{
501 int in_channels, out_channels, i, o;
502
503 if (avr->am)
504 return ff_audio_mix_get_matrix(avr->am, matrix, stride);
505
506 in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
507 out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout);
508
509 if ( in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS ||
510 out_channels <= 0 || out_channels > AVRESAMPLE_MAX_CHANNELS) {
511 av_log(avr, AV_LOG_ERROR, "Invalid channel layouts\n");
512 return AVERROR(EINVAL);
513 }
514
515 if (!avr->mix_matrix) {
516 av_log(avr, AV_LOG_ERROR, "matrix is not set\n");
517 return AVERROR(EINVAL);
518 }
519
520 for (o = 0; o < out_channels; o++)
521 for (i = 0; i < in_channels; i++)
522 matrix[o * stride + i] = avr->mix_matrix[o * in_channels + i];
523
524 return 0;
525}
526
527int avresample_set_matrix(AVAudioResampleContext *avr, const double *matrix,
528 int stride)
529{
530 int in_channels, out_channels, i, o;
531
532 if (avr->am)
533 return ff_audio_mix_set_matrix(avr->am, matrix, stride);
534
535 in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
536 out_channels = av_get_channel_layout_nb_channels(avr->out_channel_layout);
537
538 if ( in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS ||
539 out_channels <= 0 || out_channels > AVRESAMPLE_MAX_CHANNELS) {
540 av_log(avr, AV_LOG_ERROR, "Invalid channel layouts\n");
541 return AVERROR(EINVAL);
542 }
543
544 if (avr->mix_matrix)
545 av_freep(&avr->mix_matrix);
546 avr->mix_matrix = av_malloc(in_channels * out_channels *
547 sizeof(*avr->mix_matrix));
548 if (!avr->mix_matrix)
549 return AVERROR(ENOMEM);
550
551 for (o = 0; o < out_channels; o++)
552 for (i = 0; i < in_channels; i++)
553 avr->mix_matrix[o * in_channels + i] = matrix[o * stride + i];
554
555 return 0;
556}
557
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558int avresample_set_channel_mapping(AVAudioResampleContext *avr,
559 const int *channel_map)
560{
561 ChannelMapInfo *info = &avr->ch_map_info;
562 int in_channels, ch, i;
563
564 in_channels = av_get_channel_layout_nb_channels(avr->in_channel_layout);
565 if (in_channels <= 0 || in_channels > AVRESAMPLE_MAX_CHANNELS) {
566 av_log(avr, AV_LOG_ERROR, "Invalid input channel layout\n");
567 return AVERROR(EINVAL);
568 }
569
570 memset(info, 0, sizeof(*info));
571 memset(info->input_map, -1, sizeof(info->input_map));
572
573 for (ch = 0; ch < in_channels; ch++) {
574 if (channel_map[ch] >= in_channels) {
575 av_log(avr, AV_LOG_ERROR, "Invalid channel map\n");
576 return AVERROR(EINVAL);
577 }
578 if (channel_map[ch] < 0) {
579 info->channel_zero[ch] = 1;
580 info->channel_map[ch] = -1;
581 info->do_zero = 1;
582 } else if (info->input_map[channel_map[ch]] >= 0) {
583 info->channel_copy[ch] = info->input_map[channel_map[ch]];
584 info->channel_map[ch] = -1;
585 info->do_copy = 1;
586 } else {
587 info->channel_map[ch] = channel_map[ch];
588 info->input_map[channel_map[ch]] = ch;
589 info->do_remap = 1;
590 }
591 }
592 /* Fill-in unmapped input channels with unmapped output channels.
593 This is used when remapping during conversion from interleaved to
594 planar format. */
595 for (ch = 0, i = 0; ch < in_channels && i < in_channels; ch++, i++) {
596 while (ch < in_channels && info->input_map[ch] >= 0)
597 ch++;
598 while (i < in_channels && info->channel_map[i] >= 0)
599 i++;
600 if (ch >= in_channels || i >= in_channels)
601 break;
602 info->input_map[ch] = i;
603 }
604
605 avr->use_channel_map = 1;
606 return 0;
607}
608
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609int avresample_available(AVAudioResampleContext *avr)
610{
611 return av_audio_fifo_size(avr->out_fifo);
612}
613
e7ba5b1d 614int avresample_read(AVAudioResampleContext *avr, uint8_t **output, int nb_samples)
c8af852b 615{
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616 if (!output)
617 return av_audio_fifo_drain(avr->out_fifo, nb_samples);
e7ba5b1d 618 return av_audio_fifo_read(avr->out_fifo, (void**)output, nb_samples);
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619}
620
621unsigned avresample_version(void)
622{
623 return LIBAVRESAMPLE_VERSION_INT;
624}
625
626const char *avresample_license(void)
627{
628#define LICENSE_PREFIX "libavresample license: "
629 return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
630}
631
632const char *avresample_configuration(void)
633{
634 return LIBAV_CONFIGURATION;
635}