2 This file is part of PulseAudio.
4 Copyright 2004-2006 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
28 #ifdef HAVE_LIBSAMPLERATE
29 #include <samplerate.h>
33 #include <speex/speex_resampler.h>
36 #include <pulse/xmalloc.h>
37 #include <pulsecore/sconv.h>
38 #include <pulsecore/log.h>
39 #include <pulsecore/macro.h>
40 #include <pulsecore/strbuf.h>
41 #include <pulsecore/remap.h>
42 #include <pulsecore/core-util.h>
43 #include "ffmpeg/avcodec.h"
45 #include "resampler.h"
47 /* Number of samples of extra space we allow the resamplers to return */
48 #define EXTRA_FRAMES 128
51 pa_resample_method_t method
;
52 pa_resample_flags_t flags
;
54 pa_sample_spec i_ss
, o_ss
;
55 pa_channel_map i_cm
, o_cm
;
56 size_t i_fz
, o_fz
, w_fz
, w_sz
;
59 pa_memchunk to_work_format_buf
;
60 pa_memchunk remap_buf
;
61 pa_memchunk resample_buf
;
62 pa_memchunk from_work_format_buf
;
63 size_t to_work_format_buf_size
;
64 size_t remap_buf_size
;
65 size_t resample_buf_size
;
66 size_t from_work_format_buf_size
;
68 /* points to buffer before resampling stage, remap or to_work */
69 pa_memchunk
*leftover_buf
;
70 size_t *leftover_buf_size
;
72 /* have_leftover points to leftover_in_remap or leftover_in_to_work */
74 bool leftover_in_remap
;
75 bool leftover_in_to_work
;
77 pa_sample_format_t work_format
;
78 uint8_t work_channels
;
80 pa_convert_func_t to_work_format_func
;
81 pa_convert_func_t from_work_format_func
;
86 pa_resampler_impl impl
;
89 struct trivial_data
{ /* data specific to the trivial resampler */
94 struct peaks_data
{ /* data specific to the peak finder pseudo resampler */
98 float max_f
[PA_CHANNELS_MAX
];
99 int16_t max_i
[PA_CHANNELS_MAX
];
102 struct ffmpeg_data
{ /* data specific to ffmpeg */
103 struct AVResampleContext
*state
;
106 static int copy_init(pa_resampler
*r
);
107 static int trivial_init(pa_resampler
*r
);
109 static int speex_init(pa_resampler
*r
);
111 static int ffmpeg_init(pa_resampler
*r
);
112 static int peaks_init(pa_resampler
*r
);
113 #ifdef HAVE_LIBSAMPLERATE
114 static int libsamplerate_init(pa_resampler
*r
);
117 static void setup_remap(const pa_resampler
*r
, pa_remap_t
*m
);
119 static int (* const init_table
[])(pa_resampler
*r
) = {
120 #ifdef HAVE_LIBSAMPLERATE
121 [PA_RESAMPLER_SRC_SINC_BEST_QUALITY
] = libsamplerate_init
,
122 [PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY
] = libsamplerate_init
,
123 [PA_RESAMPLER_SRC_SINC_FASTEST
] = libsamplerate_init
,
124 [PA_RESAMPLER_SRC_ZERO_ORDER_HOLD
] = libsamplerate_init
,
125 [PA_RESAMPLER_SRC_LINEAR
] = libsamplerate_init
,
127 [PA_RESAMPLER_SRC_SINC_BEST_QUALITY
] = NULL
,
128 [PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY
] = NULL
,
129 [PA_RESAMPLER_SRC_SINC_FASTEST
] = NULL
,
130 [PA_RESAMPLER_SRC_ZERO_ORDER_HOLD
] = NULL
,
131 [PA_RESAMPLER_SRC_LINEAR
] = NULL
,
133 [PA_RESAMPLER_TRIVIAL
] = trivial_init
,
135 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+0] = speex_init
,
136 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+1] = speex_init
,
137 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+2] = speex_init
,
138 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+3] = speex_init
,
139 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+4] = speex_init
,
140 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+5] = speex_init
,
141 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+6] = speex_init
,
142 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+7] = speex_init
,
143 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+8] = speex_init
,
144 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+9] = speex_init
,
145 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+10] = speex_init
,
146 [PA_RESAMPLER_SPEEX_FIXED_BASE
+0] = speex_init
,
147 [PA_RESAMPLER_SPEEX_FIXED_BASE
+1] = speex_init
,
148 [PA_RESAMPLER_SPEEX_FIXED_BASE
+2] = speex_init
,
149 [PA_RESAMPLER_SPEEX_FIXED_BASE
+3] = speex_init
,
150 [PA_RESAMPLER_SPEEX_FIXED_BASE
+4] = speex_init
,
151 [PA_RESAMPLER_SPEEX_FIXED_BASE
+5] = speex_init
,
152 [PA_RESAMPLER_SPEEX_FIXED_BASE
+6] = speex_init
,
153 [PA_RESAMPLER_SPEEX_FIXED_BASE
+7] = speex_init
,
154 [PA_RESAMPLER_SPEEX_FIXED_BASE
+8] = speex_init
,
155 [PA_RESAMPLER_SPEEX_FIXED_BASE
+9] = speex_init
,
156 [PA_RESAMPLER_SPEEX_FIXED_BASE
+10] = speex_init
,
158 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+0] = NULL
,
159 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+1] = NULL
,
160 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+2] = NULL
,
161 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+3] = NULL
,
162 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+4] = NULL
,
163 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+5] = NULL
,
164 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+6] = NULL
,
165 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+7] = NULL
,
166 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+8] = NULL
,
167 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+9] = NULL
,
168 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+10] = NULL
,
169 [PA_RESAMPLER_SPEEX_FIXED_BASE
+0] = NULL
,
170 [PA_RESAMPLER_SPEEX_FIXED_BASE
+1] = NULL
,
171 [PA_RESAMPLER_SPEEX_FIXED_BASE
+2] = NULL
,
172 [PA_RESAMPLER_SPEEX_FIXED_BASE
+3] = NULL
,
173 [PA_RESAMPLER_SPEEX_FIXED_BASE
+4] = NULL
,
174 [PA_RESAMPLER_SPEEX_FIXED_BASE
+5] = NULL
,
175 [PA_RESAMPLER_SPEEX_FIXED_BASE
+6] = NULL
,
176 [PA_RESAMPLER_SPEEX_FIXED_BASE
+7] = NULL
,
177 [PA_RESAMPLER_SPEEX_FIXED_BASE
+8] = NULL
,
178 [PA_RESAMPLER_SPEEX_FIXED_BASE
+9] = NULL
,
179 [PA_RESAMPLER_SPEEX_FIXED_BASE
+10] = NULL
,
181 [PA_RESAMPLER_FFMPEG
] = ffmpeg_init
,
182 [PA_RESAMPLER_AUTO
] = NULL
,
183 [PA_RESAMPLER_COPY
] = copy_init
,
184 [PA_RESAMPLER_PEAKS
] = peaks_init
,
187 static pa_resample_method_t
choose_auto_resampler(pa_resample_flags_t flags
) {
188 pa_resample_method_t method
;
190 if (pa_resample_method_supported(PA_RESAMPLER_SPEEX_FLOAT_BASE
+ 1))
191 method
= PA_RESAMPLER_SPEEX_FLOAT_BASE
+ 1;
192 else if (flags
& PA_RESAMPLER_VARIABLE_RATE
)
193 method
= PA_RESAMPLER_TRIVIAL
;
195 method
= PA_RESAMPLER_FFMPEG
;
200 static pa_resample_method_t
pa_resampler_fix_method(
201 pa_resample_flags_t flags
,
202 pa_resample_method_t method
,
203 const uint32_t rate_a
,
204 const uint32_t rate_b
) {
206 pa_assert(pa_sample_rate_valid(rate_a
));
207 pa_assert(pa_sample_rate_valid(rate_b
));
208 pa_assert(method
>= 0);
209 pa_assert(method
< PA_RESAMPLER_MAX
);
211 if (!(flags
& PA_RESAMPLER_VARIABLE_RATE
) && rate_a
== rate_b
) {
212 pa_log_info("Forcing resampler 'copy', because of fixed, identical sample rates.");
213 method
= PA_RESAMPLER_COPY
;
216 if (!pa_resample_method_supported(method
)) {
217 pa_log_warn("Support for resampler '%s' not compiled in, reverting to 'auto'.", pa_resample_method_to_string(method
));
218 method
= PA_RESAMPLER_AUTO
;
222 case PA_RESAMPLER_COPY
:
223 if (rate_a
!= rate_b
) {
224 pa_log_info("Resampler 'copy' cannot change sampling rate, reverting to resampler 'auto'.");
225 method
= PA_RESAMPLER_AUTO
;
228 /* Else fall through */
229 case PA_RESAMPLER_FFMPEG
:
230 if (flags
& PA_RESAMPLER_VARIABLE_RATE
) {
231 pa_log_info("Resampler '%s' cannot do variable rate, reverting to resampler 'auto'.", pa_resample_method_to_string(method
));
232 method
= PA_RESAMPLER_AUTO
;
236 /* The Peaks resampler only supports downsampling.
237 * Revert to auto if we are upsampling */
238 case PA_RESAMPLER_PEAKS
:
239 if (rate_a
< rate_b
) {
240 pa_log_warn("The 'peaks' resampler only supports downsampling, reverting to resampler 'auto'.");
241 method
= PA_RESAMPLER_AUTO
;
249 if (method
== PA_RESAMPLER_AUTO
)
250 method
= choose_auto_resampler(flags
);
255 /* Return true if a is a more precise sample format than b, else return false */
256 static bool sample_format_more_precise(pa_sample_format_t a
, pa_sample_format_t b
) {
257 pa_assert(pa_sample_format_valid(a
));
258 pa_assert(pa_sample_format_valid(b
));
267 case PA_SAMPLE_S16LE
:
268 case PA_SAMPLE_S16BE
:
269 if (b
== PA_SAMPLE_ULAW
|| b
== PA_SAMPLE_ALAW
|| b
== PA_SAMPLE_U8
)
275 case PA_SAMPLE_S24LE
:
276 case PA_SAMPLE_S24BE
:
277 case PA_SAMPLE_S24_32LE
:
278 case PA_SAMPLE_S24_32BE
:
279 if (b
== PA_SAMPLE_ULAW
|| b
== PA_SAMPLE_ALAW
|| b
== PA_SAMPLE_U8
||
280 b
== PA_SAMPLE_S16LE
|| b
== PA_SAMPLE_S16BE
)
286 case PA_SAMPLE_FLOAT32LE
:
287 case PA_SAMPLE_FLOAT32BE
:
288 case PA_SAMPLE_S32LE
:
289 case PA_SAMPLE_S32BE
:
290 if (b
== PA_SAMPLE_FLOAT32LE
|| b
== PA_SAMPLE_FLOAT32BE
||
291 b
== PA_SAMPLE_S32LE
|| b
== PA_SAMPLE_FLOAT32BE
)
302 static pa_sample_format_t
pa_resampler_choose_work_format(
303 pa_resample_method_t method
,
304 pa_sample_format_t a
,
305 pa_sample_format_t b
,
307 pa_sample_format_t work_format
;
309 pa_assert(pa_sample_format_valid(a
));
310 pa_assert(pa_sample_format_valid(b
));
311 pa_assert(method
>= 0);
312 pa_assert(method
< PA_RESAMPLER_MAX
);
314 if (method
>= PA_RESAMPLER_SPEEX_FIXED_BASE
&& method
<= PA_RESAMPLER_SPEEX_FIXED_MAX
)
315 method
= PA_RESAMPLER_SPEEX_FIXED_BASE
;
318 /* This block is for resampling functions that only
319 * support the S16 sample format. */
320 case PA_RESAMPLER_SPEEX_FIXED_BASE
: /* fall through */
321 case PA_RESAMPLER_FFMPEG
:
322 work_format
= PA_SAMPLE_S16NE
;
325 /* This block is for resampling functions that support
326 * any sample format. */
327 case PA_RESAMPLER_COPY
: /* fall through */
328 case PA_RESAMPLER_TRIVIAL
:
329 if (!map_required
&& a
== b
) {
333 /* Else fall trough */
334 case PA_RESAMPLER_PEAKS
:
335 if (a
== PA_SAMPLE_S16NE
|| b
== PA_SAMPLE_S16NE
)
336 work_format
= PA_SAMPLE_S16NE
;
337 else if (sample_format_more_precise(a
, PA_SAMPLE_S16NE
) ||
338 sample_format_more_precise(b
, PA_SAMPLE_S16NE
))
339 work_format
= PA_SAMPLE_FLOAT32NE
;
341 work_format
= PA_SAMPLE_S16NE
;
345 work_format
= PA_SAMPLE_FLOAT32NE
;
351 pa_resampler
* pa_resampler_new(
353 const pa_sample_spec
*a
,
354 const pa_channel_map
*am
,
355 const pa_sample_spec
*b
,
356 const pa_channel_map
*bm
,
357 pa_resample_method_t method
,
358 pa_resample_flags_t flags
) {
360 pa_resampler
*r
= NULL
;
365 pa_assert(pa_sample_spec_valid(a
));
366 pa_assert(pa_sample_spec_valid(b
));
367 pa_assert(method
>= 0);
368 pa_assert(method
< PA_RESAMPLER_MAX
);
370 method
= pa_resampler_fix_method(flags
, method
, a
->rate
, b
->rate
);
372 r
= pa_xnew0(pa_resampler
, 1);
377 /* Fill sample specs */
383 else if (!pa_channel_map_init_auto(&r
->i_cm
, r
->i_ss
.channels
, PA_CHANNEL_MAP_DEFAULT
))
388 else if (!pa_channel_map_init_auto(&r
->o_cm
, r
->o_ss
.channels
, PA_CHANNEL_MAP_DEFAULT
))
391 r
->i_fz
= pa_frame_size(a
);
392 r
->o_fz
= pa_frame_size(b
);
394 r
->map_required
= (r
->i_ss
.channels
!= r
->o_ss
.channels
|| (!(r
->flags
& PA_RESAMPLER_NO_REMAP
) &&
395 !pa_channel_map_equal(&r
->i_cm
, &r
->o_cm
)));
397 r
->work_format
= pa_resampler_choose_work_format(method
, a
->format
, b
->format
, r
->map_required
);
398 r
->w_sz
= pa_sample_size_of_format(r
->work_format
);
400 if (r
->i_ss
.format
!= r
->work_format
) {
401 if (r
->work_format
== PA_SAMPLE_FLOAT32NE
) {
402 if (!(r
->to_work_format_func
= pa_get_convert_to_float32ne_function(r
->i_ss
.format
)))
405 pa_assert(r
->work_format
== PA_SAMPLE_S16NE
);
406 if (!(r
->to_work_format_func
= pa_get_convert_to_s16ne_function(r
->i_ss
.format
)))
411 if (r
->o_ss
.format
!= r
->work_format
) {
412 if (r
->work_format
== PA_SAMPLE_FLOAT32NE
) {
413 if (!(r
->from_work_format_func
= pa_get_convert_from_float32ne_function(r
->o_ss
.format
)))
416 pa_assert(r
->work_format
== PA_SAMPLE_S16NE
);
417 if (!(r
->from_work_format_func
= pa_get_convert_from_s16ne_function(r
->o_ss
.format
)))
422 if (r
->o_ss
.channels
<= r
->i_ss
.channels
) {
423 /* pipeline is: format conv. -> remap -> resample -> format conv. */
424 r
->work_channels
= r
->o_ss
.channels
;
426 /* leftover buffer is remap output buffer (before resampling) */
427 r
->leftover_buf
= &r
->remap_buf
;
428 r
->leftover_buf_size
= &r
->remap_buf_size
;
429 r
->have_leftover
= &r
->leftover_in_remap
;
431 /* pipeline is: format conv. -> resample -> remap -> format conv. */
432 r
->work_channels
= r
->i_ss
.channels
;
434 /* leftover buffer is to_work output buffer (before resampling) */
435 r
->leftover_buf
= &r
->to_work_format_buf
;
436 r
->leftover_buf_size
= &r
->to_work_format_buf_size
;
437 r
->have_leftover
= &r
->leftover_in_to_work
;
439 r
->w_fz
= pa_sample_size_of_format(r
->work_format
) * r
->work_channels
;
441 pa_log_debug("Resampler:");
442 pa_log_debug(" rate %d -> %d (method %s)", a
->rate
, b
->rate
, pa_resample_method_to_string(r
->method
));
443 pa_log_debug(" format %s -> %s (intermediate %s)", pa_sample_format_to_string(a
->format
),
444 pa_sample_format_to_string(b
->format
), pa_sample_format_to_string(r
->work_format
));
445 pa_log_debug(" channels %d -> %d (resampling %d)", a
->channels
, b
->channels
, r
->work_channels
);
447 /* set up the remap structure */
449 setup_remap(r
, &r
->remap
);
451 /* initialize implementation */
452 if (init_table
[method
](r
) < 0)
463 void pa_resampler_free(pa_resampler
*r
) {
469 pa_xfree(r
->impl
.data
);
471 if (r
->to_work_format_buf
.memblock
)
472 pa_memblock_unref(r
->to_work_format_buf
.memblock
);
473 if (r
->remap_buf
.memblock
)
474 pa_memblock_unref(r
->remap_buf
.memblock
);
475 if (r
->resample_buf
.memblock
)
476 pa_memblock_unref(r
->resample_buf
.memblock
);
477 if (r
->from_work_format_buf
.memblock
)
478 pa_memblock_unref(r
->from_work_format_buf
.memblock
);
483 void pa_resampler_set_input_rate(pa_resampler
*r
, uint32_t rate
) {
486 pa_assert(r
->impl
.update_rates
);
488 if (r
->i_ss
.rate
== rate
)
493 r
->impl
.update_rates(r
);
496 void pa_resampler_set_output_rate(pa_resampler
*r
, uint32_t rate
) {
499 pa_assert(r
->impl
.update_rates
);
501 if (r
->o_ss
.rate
== rate
)
506 r
->impl
.update_rates(r
);
509 size_t pa_resampler_request(pa_resampler
*r
, size_t out_length
) {
512 /* Let's round up here to make it more likely that the caller will get at
513 * least out_length amount of data from pa_resampler_run().
515 * We don't take the leftover into account here. If we did, then it might
516 * be in theory possible that this function would return 0 and
517 * pa_resampler_run() would also return 0. That could lead to infinite
518 * loops. When the leftover is ignored here, such loops would eventually
519 * terminate, because the leftover would grow each round, finally
520 * surpassing the minimum input threshold of the resampler. */
521 return ((((uint64_t) ((out_length
+ r
->o_fz
-1) / r
->o_fz
) * r
->i_ss
.rate
) + r
->o_ss
.rate
-1) / r
->o_ss
.rate
) * r
->i_fz
;
524 size_t pa_resampler_result(pa_resampler
*r
, size_t in_length
) {
529 /* Let's round up here to ensure that the caller will always allocate big
530 * enough output buffer. */
532 frames
= (in_length
+ r
->i_fz
- 1) / r
->i_fz
;
533 if (*r
->have_leftover
)
534 frames
+= r
->leftover_buf
->length
/ r
->w_fz
;
536 return (((uint64_t) frames
* r
->o_ss
.rate
+ r
->i_ss
.rate
- 1) / r
->i_ss
.rate
) * r
->o_fz
;
539 size_t pa_resampler_max_block_size(pa_resampler
*r
) {
540 size_t block_size_max
;
541 pa_sample_spec max_ss
;
547 block_size_max
= pa_mempool_block_size_max(r
->mempool
);
549 /* We deduce the "largest" sample spec we're using during the
551 max_ss
.channels
= (uint8_t) (PA_MAX(r
->i_ss
.channels
, r
->o_ss
.channels
));
553 /* We silently assume that the format enum is ordered by size */
554 max_ss
.format
= PA_MAX(r
->i_ss
.format
, r
->o_ss
.format
);
555 max_ss
.format
= PA_MAX(max_ss
.format
, r
->work_format
);
557 max_ss
.rate
= PA_MAX(r
->i_ss
.rate
, r
->o_ss
.rate
);
559 max_fs
= pa_frame_size(&max_ss
);
560 frames
= block_size_max
/ max_fs
- EXTRA_FRAMES
;
562 pa_assert(frames
>= (r
->leftover_buf
->length
/ r
->w_fz
));
563 if (*r
->have_leftover
)
564 frames
-= r
->leftover_buf
->length
/ r
->w_fz
;
566 block_size_max
= ((uint64_t) frames
* r
->i_ss
.rate
/ max_ss
.rate
) * r
->i_fz
;
568 if (block_size_max
> 0)
569 return block_size_max
;
571 /* A single input frame may result in so much output that it doesn't
572 * fit in one standard memblock (e.g. converting 1 Hz to 44100 Hz). In
573 * this case the max block size will be set to one frame, and some
574 * memory will be probably be allocated with malloc() instead of using
577 * XXX: Should we support this case at all? We could also refuse to
578 * create resamplers whose max block size would exceed the memory pool
579 * block size. In this case also updating the resampler rate should
580 * fail if the new rate would cause an excessive max block size (in
581 * which case the stream would probably have to be killed). */
585 void pa_resampler_reset(pa_resampler
*r
) {
591 *r
->have_leftover
= false;
594 pa_resample_method_t
pa_resampler_get_method(pa_resampler
*r
) {
600 const pa_channel_map
* pa_resampler_input_channel_map(pa_resampler
*r
) {
606 const pa_sample_spec
* pa_resampler_input_sample_spec(pa_resampler
*r
) {
612 const pa_channel_map
* pa_resampler_output_channel_map(pa_resampler
*r
) {
618 const pa_sample_spec
* pa_resampler_output_sample_spec(pa_resampler
*r
) {
624 static const char * const resample_methods
[] = {
625 "src-sinc-best-quality",
626 "src-sinc-medium-quality",
628 "src-zero-order-hold",
659 const char *pa_resample_method_to_string(pa_resample_method_t m
) {
661 if (m
< 0 || m
>= PA_RESAMPLER_MAX
)
664 return resample_methods
[m
];
667 int pa_resample_method_supported(pa_resample_method_t m
) {
669 if (m
< 0 || m
>= PA_RESAMPLER_MAX
)
672 #ifndef HAVE_LIBSAMPLERATE
673 if (m
<= PA_RESAMPLER_SRC_LINEAR
)
678 if (m
>= PA_RESAMPLER_SPEEX_FLOAT_BASE
&& m
<= PA_RESAMPLER_SPEEX_FLOAT_MAX
)
680 if (m
>= PA_RESAMPLER_SPEEX_FIXED_BASE
&& m
<= PA_RESAMPLER_SPEEX_FIXED_MAX
)
687 pa_resample_method_t
pa_parse_resample_method(const char *string
) {
688 pa_resample_method_t m
;
692 for (m
= 0; m
< PA_RESAMPLER_MAX
; m
++)
693 if (pa_streq(string
, resample_methods
[m
]))
696 if (pa_streq(string
, "speex-fixed"))
697 return PA_RESAMPLER_SPEEX_FIXED_BASE
+ 1;
699 if (pa_streq(string
, "speex-float"))
700 return PA_RESAMPLER_SPEEX_FLOAT_BASE
+ 1;
702 return PA_RESAMPLER_INVALID
;
705 static bool on_left(pa_channel_position_t p
) {
708 p
== PA_CHANNEL_POSITION_FRONT_LEFT
||
709 p
== PA_CHANNEL_POSITION_REAR_LEFT
||
710 p
== PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER
||
711 p
== PA_CHANNEL_POSITION_SIDE_LEFT
||
712 p
== PA_CHANNEL_POSITION_TOP_FRONT_LEFT
||
713 p
== PA_CHANNEL_POSITION_TOP_REAR_LEFT
;
716 static bool on_right(pa_channel_position_t p
) {
719 p
== PA_CHANNEL_POSITION_FRONT_RIGHT
||
720 p
== PA_CHANNEL_POSITION_REAR_RIGHT
||
721 p
== PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER
||
722 p
== PA_CHANNEL_POSITION_SIDE_RIGHT
||
723 p
== PA_CHANNEL_POSITION_TOP_FRONT_RIGHT
||
724 p
== PA_CHANNEL_POSITION_TOP_REAR_RIGHT
;
727 static bool on_center(pa_channel_position_t p
) {
730 p
== PA_CHANNEL_POSITION_FRONT_CENTER
||
731 p
== PA_CHANNEL_POSITION_REAR_CENTER
||
732 p
== PA_CHANNEL_POSITION_TOP_CENTER
||
733 p
== PA_CHANNEL_POSITION_TOP_FRONT_CENTER
||
734 p
== PA_CHANNEL_POSITION_TOP_REAR_CENTER
;
737 static bool on_lfe(pa_channel_position_t p
) {
739 p
== PA_CHANNEL_POSITION_LFE
;
742 static bool on_front(pa_channel_position_t p
) {
744 p
== PA_CHANNEL_POSITION_FRONT_LEFT
||
745 p
== PA_CHANNEL_POSITION_FRONT_RIGHT
||
746 p
== PA_CHANNEL_POSITION_FRONT_CENTER
||
747 p
== PA_CHANNEL_POSITION_TOP_FRONT_LEFT
||
748 p
== PA_CHANNEL_POSITION_TOP_FRONT_RIGHT
||
749 p
== PA_CHANNEL_POSITION_TOP_FRONT_CENTER
||
750 p
== PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER
||
751 p
== PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER
;
754 static bool on_rear(pa_channel_position_t p
) {
756 p
== PA_CHANNEL_POSITION_REAR_LEFT
||
757 p
== PA_CHANNEL_POSITION_REAR_RIGHT
||
758 p
== PA_CHANNEL_POSITION_REAR_CENTER
||
759 p
== PA_CHANNEL_POSITION_TOP_REAR_LEFT
||
760 p
== PA_CHANNEL_POSITION_TOP_REAR_RIGHT
||
761 p
== PA_CHANNEL_POSITION_TOP_REAR_CENTER
;
764 static bool on_side(pa_channel_position_t p
) {
766 p
== PA_CHANNEL_POSITION_SIDE_LEFT
||
767 p
== PA_CHANNEL_POSITION_SIDE_RIGHT
||
768 p
== PA_CHANNEL_POSITION_TOP_CENTER
;
778 static int front_rear_side(pa_channel_position_t p
) {
788 static void setup_remap(const pa_resampler
*r
, pa_remap_t
*m
) {
791 bool ic_connected
[PA_CHANNELS_MAX
];
799 n_oc
= r
->o_ss
.channels
;
800 n_ic
= r
->i_ss
.channels
;
802 m
->format
= r
->work_format
;
806 memset(m
->map_table_f
, 0, sizeof(m
->map_table_f
));
807 memset(m
->map_table_i
, 0, sizeof(m
->map_table_i
));
809 memset(ic_connected
, 0, sizeof(ic_connected
));
810 remix
= (r
->flags
& (PA_RESAMPLER_NO_REMAP
| PA_RESAMPLER_NO_REMIX
)) == 0;
812 if (r
->flags
& PA_RESAMPLER_NO_REMAP
) {
815 for (oc
= 0; oc
< PA_MIN(n_ic
, n_oc
); oc
++)
816 m
->map_table_f
[oc
][oc
] = 1.0f
;
818 } else if (r
->flags
& PA_RESAMPLER_NO_REMIX
) {
820 for (oc
= 0; oc
< n_oc
; oc
++) {
821 pa_channel_position_t b
= r
->o_cm
.map
[oc
];
823 for (ic
= 0; ic
< n_ic
; ic
++) {
824 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
826 /* We shall not do any remixing. Hence, just check by name */
828 m
->map_table_f
[oc
][ic
] = 1.0f
;
833 /* OK, we shall do the full monty: upmixing and downmixing. Our
834 * algorithm is relatively simple, does not do spacialization, delay
835 * elements or apply lowpass filters for LFE. Patches are always
836 * welcome, though. Oh, and it doesn't do any matrix decoding. (Which
837 * probably wouldn't make any sense anyway.)
839 * This code is not idempotent: downmixing an upmixed stereo stream is
840 * not identical to the original. The volume will not match, and the
841 * two channels will be a linear combination of both.
843 * This is loosely based on random suggestions found on the Internet,
845 * http://www.halfgaar.net/surround-sound-in-linux and the alsa upmix
848 * The algorithm works basically like this:
850 * 1) Connect all channels with matching names.
853 * S:Mono: Copy into all D:channels
854 * D:Mono: Avg all S:channels
856 * 3) Mix D:Left, D:Right:
857 * D:Left: If not connected, avg all S:Left
858 * D:Right: If not connected, avg all S:Right
861 * If not connected, avg all S:Center
862 * If still not connected, avg all S:Left, S:Right
865 * If not connected, avg all S:*
867 * 6) Make sure S:Left/S:Right is used: S:Left/S:Right: If not
868 * connected, mix into all D:left and all D:right channels. Gain is
871 * 7) Make sure S:Center, S:LFE is used:
873 * S:Center, S:LFE: If not connected, mix into all D:left, all
874 * D:right, all D:center channels. Gain is 0.5 for center and 0.375
875 * for LFE. C-front is only mixed into L-front/R-front if available,
876 * otherwise into all L/R channels. Similarly for C-rear.
878 * 8) Normalize each row in the matrix such that the sum for each row is
879 * not larger than 1.0 in order to avoid clipping.
881 * S: and D: shall relate to the source resp. destination channels.
883 * Rationale: 1, 2 are probably obvious. For 3: this copies front to
884 * rear if needed. For 4: we try to find some suitable C source for C,
885 * if we don't find any, we avg L and R. For 5: LFE is mixed from all
886 * channels. For 6: the rear channels should not be dropped entirely,
887 * however have only minimal impact. For 7: movies usually encode
888 * speech on the center channel. Thus we have to make sure this channel
889 * is distributed to L and R if not available in the output. Also, LFE
890 * is used to achieve a greater dynamic range, and thus we should try
891 * to do our best to pass it to L+R.
898 ic_unconnected_left
= 0,
899 ic_unconnected_right
= 0,
900 ic_unconnected_center
= 0,
901 ic_unconnected_lfe
= 0;
902 bool ic_unconnected_center_mixed_in
= 0;
906 for (ic
= 0; ic
< n_ic
; ic
++) {
907 if (on_left(r
->i_cm
.map
[ic
]))
909 if (on_right(r
->i_cm
.map
[ic
]))
911 if (on_center(r
->i_cm
.map
[ic
]))
915 for (oc
= 0; oc
< n_oc
; oc
++) {
916 bool oc_connected
= false;
917 pa_channel_position_t b
= r
->o_cm
.map
[oc
];
919 for (ic
= 0; ic
< n_ic
; ic
++) {
920 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
922 if (a
== b
|| a
== PA_CHANNEL_POSITION_MONO
) {
923 m
->map_table_f
[oc
][ic
] = 1.0f
;
926 ic_connected
[ic
] = true;
928 else if (b
== PA_CHANNEL_POSITION_MONO
) {
929 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) n_ic
;
932 ic_connected
[ic
] = true;
937 /* Try to find matching input ports for this output port */
941 /* We are not connected and on the left side, let's
942 * average all left side input channels. */
945 for (ic
= 0; ic
< n_ic
; ic
++)
946 if (on_left(r
->i_cm
.map
[ic
])) {
947 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) ic_left
;
948 ic_connected
[ic
] = true;
951 /* We ignore the case where there is no left input channel.
952 * Something is really wrong in this case anyway. */
954 } else if (on_right(b
)) {
956 /* We are not connected and on the right side, let's
957 * average all right side input channels. */
960 for (ic
= 0; ic
< n_ic
; ic
++)
961 if (on_right(r
->i_cm
.map
[ic
])) {
962 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) ic_right
;
963 ic_connected
[ic
] = true;
966 /* We ignore the case where there is no right input
967 * channel. Something is really wrong in this case anyway.
970 } else if (on_center(b
)) {
974 /* We are not connected and at the center. Let's average
975 * all center input channels. */
977 for (ic
= 0; ic
< n_ic
; ic
++)
978 if (on_center(r
->i_cm
.map
[ic
])) {
979 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) ic_center
;
980 ic_connected
[ic
] = true;
983 } else if (ic_left
+ ic_right
> 0) {
985 /* Hmm, no center channel around, let's synthesize it
986 * by mixing L and R.*/
988 for (ic
= 0; ic
< n_ic
; ic
++)
989 if (on_left(r
->i_cm
.map
[ic
]) || on_right(r
->i_cm
.map
[ic
])) {
990 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) (ic_left
+ ic_right
);
991 ic_connected
[ic
] = true;
995 /* We ignore the case where there is not even a left or
996 * right input channel. Something is really wrong in this
999 } else if (on_lfe(b
) && !(r
->flags
& PA_RESAMPLER_NO_LFE
)) {
1001 /* We are not connected and an LFE. Let's average all
1002 * channels for LFE. */
1004 for (ic
= 0; ic
< n_ic
; ic
++)
1005 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) n_ic
;
1007 /* Please note that a channel connected to LFE doesn't
1008 * really count as connected. */
1013 for (ic
= 0; ic
< n_ic
; ic
++) {
1014 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
1016 if (ic_connected
[ic
])
1020 ic_unconnected_left
++;
1021 else if (on_right(a
))
1022 ic_unconnected_right
++;
1023 else if (on_center(a
))
1024 ic_unconnected_center
++;
1026 ic_unconnected_lfe
++;
1029 for (ic
= 0; ic
< n_ic
; ic
++) {
1030 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
1032 if (ic_connected
[ic
])
1035 for (oc
= 0; oc
< n_oc
; oc
++) {
1036 pa_channel_position_t b
= r
->o_cm
.map
[oc
];
1038 if (on_left(a
) && on_left(b
))
1039 m
->map_table_f
[oc
][ic
] = (1.f
/9.f
) / (float) ic_unconnected_left
;
1041 else if (on_right(a
) && on_right(b
))
1042 m
->map_table_f
[oc
][ic
] = (1.f
/9.f
) / (float) ic_unconnected_right
;
1044 else if (on_center(a
) && on_center(b
)) {
1045 m
->map_table_f
[oc
][ic
] = (1.f
/9.f
) / (float) ic_unconnected_center
;
1046 ic_unconnected_center_mixed_in
= true;
1048 } else if (on_lfe(a
) && !(r
->flags
& PA_RESAMPLER_NO_LFE
))
1049 m
->map_table_f
[oc
][ic
] = .375f
/ (float) ic_unconnected_lfe
;
1053 if (ic_unconnected_center
> 0 && !ic_unconnected_center_mixed_in
) {
1054 unsigned ncenter
[PA_CHANNELS_MAX
];
1055 bool found_frs
[PA_CHANNELS_MAX
];
1057 memset(ncenter
, 0, sizeof(ncenter
));
1058 memset(found_frs
, 0, sizeof(found_frs
));
1060 /* Hmm, as it appears there was no center channel we
1061 could mix our center channel in. In this case, mix it into
1062 left and right. Using .5 as the factor. */
1064 for (ic
= 0; ic
< n_ic
; ic
++) {
1066 if (ic_connected
[ic
])
1069 if (!on_center(r
->i_cm
.map
[ic
]))
1072 for (oc
= 0; oc
< n_oc
; oc
++) {
1074 if (!on_left(r
->o_cm
.map
[oc
]) && !on_right(r
->o_cm
.map
[oc
]))
1077 if (front_rear_side(r
->i_cm
.map
[ic
]) == front_rear_side(r
->o_cm
.map
[oc
])) {
1078 found_frs
[ic
] = true;
1083 for (oc
= 0; oc
< n_oc
; oc
++) {
1085 if (!on_left(r
->o_cm
.map
[oc
]) && !on_right(r
->o_cm
.map
[oc
]))
1088 if (!found_frs
[ic
] || front_rear_side(r
->i_cm
.map
[ic
]) == front_rear_side(r
->o_cm
.map
[oc
]))
1093 for (oc
= 0; oc
< n_oc
; oc
++) {
1095 if (!on_left(r
->o_cm
.map
[oc
]) && !on_right(r
->o_cm
.map
[oc
]))
1098 if (ncenter
[oc
] <= 0)
1101 for (ic
= 0; ic
< n_ic
; ic
++) {
1103 if (!on_center(r
->i_cm
.map
[ic
]))
1106 if (!found_frs
[ic
] || front_rear_side(r
->i_cm
.map
[ic
]) == front_rear_side(r
->o_cm
.map
[oc
]))
1107 m
->map_table_f
[oc
][ic
] = .5f
/ (float) ncenter
[oc
];
1113 for (oc
= 0; oc
< n_oc
; oc
++) {
1115 for (ic
= 0; ic
< n_ic
; ic
++)
1116 sum
+= m
->map_table_f
[oc
][ic
];
1119 for (ic
= 0; ic
< n_ic
; ic
++)
1120 m
->map_table_f
[oc
][ic
] /= sum
;
1123 /* make an 16:16 int version of the matrix */
1124 for (oc
= 0; oc
< n_oc
; oc
++)
1125 for (ic
= 0; ic
< n_ic
; ic
++)
1126 m
->map_table_i
[oc
][ic
] = (int32_t) (m
->map_table_f
[oc
][ic
] * 0x10000);
1128 s
= pa_strbuf_new();
1130 pa_strbuf_printf(s
, " ");
1131 for (ic
= 0; ic
< n_ic
; ic
++)
1132 pa_strbuf_printf(s
, " I%02u ", ic
);
1133 pa_strbuf_puts(s
, "\n +");
1135 for (ic
= 0; ic
< n_ic
; ic
++)
1136 pa_strbuf_printf(s
, "------");
1137 pa_strbuf_puts(s
, "\n");
1139 for (oc
= 0; oc
< n_oc
; oc
++) {
1140 pa_strbuf_printf(s
, "O%02u |", oc
);
1142 for (ic
= 0; ic
< n_ic
; ic
++)
1143 pa_strbuf_printf(s
, " %1.3f", m
->map_table_f
[oc
][ic
]);
1145 pa_strbuf_puts(s
, "\n");
1148 pa_log_debug("Channel matrix:\n%s", t
= pa_strbuf_tostring_free(s
));
1151 /* initialize the remapping function */
1152 pa_init_remap_func(m
);
1155 /* check if buf's memblock is large enough to hold 'len' bytes; create a
1156 * new memblock if necessary and optionally preserve 'copy' data bytes */
1157 static void fit_buf(pa_resampler
*r
, pa_memchunk
*buf
, size_t len
, size_t *size
, size_t copy
) {
1160 if (!buf
->memblock
|| len
> *size
) {
1161 pa_memblock
*new_block
= pa_memblock_new(r
->mempool
, len
);
1163 if (buf
->memblock
) {
1165 void *src
= pa_memblock_acquire(buf
->memblock
);
1166 void *dst
= pa_memblock_acquire(new_block
);
1167 pa_assert(copy
<= len
);
1168 memcpy(dst
, src
, copy
);
1169 pa_memblock_release(new_block
);
1170 pa_memblock_release(buf
->memblock
);
1173 pa_memblock_unref(buf
->memblock
);
1176 buf
->memblock
= new_block
;
1183 static pa_memchunk
* convert_to_work_format(pa_resampler
*r
, pa_memchunk
*input
) {
1184 unsigned in_n_samples
, out_n_samples
;
1187 size_t leftover_length
= 0;
1191 pa_assert(input
->memblock
);
1193 /* Convert the incoming sample into the work sample format and place them
1194 * in to_work_format_buf. The leftover data is already converted, so it's
1195 * part of the output buffer. */
1197 have_leftover
= r
->leftover_in_to_work
;
1198 r
->leftover_in_to_work
= false;
1200 if (!have_leftover
&& (!r
->to_work_format_func
|| !input
->length
))
1202 else if (input
->length
<= 0)
1203 return &r
->to_work_format_buf
;
1205 in_n_samples
= out_n_samples
= (unsigned) ((input
->length
/ r
->i_fz
) * r
->i_ss
.channels
);
1207 if (have_leftover
) {
1208 leftover_length
= r
->to_work_format_buf
.length
;
1209 out_n_samples
+= (unsigned) (leftover_length
/ r
->w_sz
);
1212 fit_buf(r
, &r
->to_work_format_buf
, r
->w_sz
* out_n_samples
, &r
->to_work_format_buf_size
, leftover_length
);
1214 src
= pa_memblock_acquire_chunk(input
);
1215 dst
= (uint8_t *) pa_memblock_acquire(r
->to_work_format_buf
.memblock
) + leftover_length
;
1217 if (r
->to_work_format_func
)
1218 r
->to_work_format_func(in_n_samples
, src
, dst
);
1220 memcpy(dst
, src
, input
->length
);
1222 pa_memblock_release(input
->memblock
);
1223 pa_memblock_release(r
->to_work_format_buf
.memblock
);
1225 return &r
->to_work_format_buf
;
1228 static pa_memchunk
*remap_channels(pa_resampler
*r
, pa_memchunk
*input
) {
1229 unsigned in_n_samples
, out_n_samples
, in_n_frames
, out_n_frames
;
1231 size_t leftover_length
= 0;
1236 pa_assert(input
->memblock
);
1238 /* Remap channels and place the result in remap_buf. There may be leftover
1239 * data in the beginning of remap_buf. The leftover data is already
1240 * remapped, so it's not part of the input, it's part of the output. */
1242 have_leftover
= r
->leftover_in_remap
;
1243 r
->leftover_in_remap
= false;
1245 if (!have_leftover
&& (!r
->map_required
|| input
->length
<= 0))
1247 else if (input
->length
<= 0)
1248 return &r
->remap_buf
;
1250 in_n_samples
= (unsigned) (input
->length
/ r
->w_sz
);
1251 in_n_frames
= out_n_frames
= in_n_samples
/ r
->i_ss
.channels
;
1253 if (have_leftover
) {
1254 leftover_length
= r
->remap_buf
.length
;
1255 out_n_frames
+= leftover_length
/ r
->w_fz
;
1258 out_n_samples
= out_n_frames
* r
->o_ss
.channels
;
1259 fit_buf(r
, &r
->remap_buf
, out_n_samples
* r
->w_sz
, &r
->remap_buf_size
, leftover_length
);
1261 src
= pa_memblock_acquire_chunk(input
);
1262 dst
= (uint8_t *) pa_memblock_acquire(r
->remap_buf
.memblock
) + leftover_length
;
1264 if (r
->map_required
) {
1265 pa_remap_t
*remap
= &r
->remap
;
1267 pa_assert(remap
->do_remap
);
1268 remap
->do_remap(remap
, dst
, src
, in_n_frames
);
1271 memcpy(dst
, src
, input
->length
);
1273 pa_memblock_release(input
->memblock
);
1274 pa_memblock_release(r
->remap_buf
.memblock
);
1276 return &r
->remap_buf
;
1279 static void save_leftover(pa_resampler
*r
, void *buf
, size_t len
) {
1286 /* Store the leftover data. */
1287 fit_buf(r
, r
->leftover_buf
, len
, r
->leftover_buf_size
, 0);
1288 *r
->have_leftover
= true;
1290 dst
= pa_memblock_acquire(r
->leftover_buf
->memblock
);
1291 memmove(dst
, buf
, len
);
1292 pa_memblock_release(r
->leftover_buf
->memblock
);
1295 static pa_memchunk
*resample(pa_resampler
*r
, pa_memchunk
*input
) {
1296 unsigned in_n_frames
, out_n_frames
, leftover_n_frames
;
1301 /* Resample the data and place the result in resample_buf. */
1303 if (!r
->impl
.resample
|| !input
->length
)
1306 in_n_frames
= (unsigned) (input
->length
/ r
->w_fz
);
1308 out_n_frames
= ((in_n_frames
*r
->o_ss
.rate
)/r
->i_ss
.rate
)+EXTRA_FRAMES
;
1309 fit_buf(r
, &r
->resample_buf
, r
->w_fz
* out_n_frames
, &r
->resample_buf_size
, 0);
1311 leftover_n_frames
= r
->impl
.resample(r
, input
, in_n_frames
, &r
->resample_buf
, &out_n_frames
);
1313 if (leftover_n_frames
> 0) {
1314 void *leftover_data
= (uint8_t *) pa_memblock_acquire_chunk(input
) + (in_n_frames
- leftover_n_frames
) * r
->w_fz
;
1315 save_leftover(r
, leftover_data
, leftover_n_frames
* r
->w_fz
);
1316 pa_memblock_release(input
->memblock
);
1319 r
->resample_buf
.length
= out_n_frames
* r
->w_fz
;
1321 return &r
->resample_buf
;
1324 static pa_memchunk
*convert_from_work_format(pa_resampler
*r
, pa_memchunk
*input
) {
1325 unsigned n_samples
, n_frames
;
1331 /* Convert the data into the correct sample type and place the result in
1332 * from_work_format_buf. */
1334 if (!r
->from_work_format_func
|| !input
->length
)
1337 n_samples
= (unsigned) (input
->length
/ r
->w_sz
);
1338 n_frames
= n_samples
/ r
->o_ss
.channels
;
1339 fit_buf(r
, &r
->from_work_format_buf
, r
->o_fz
* n_frames
, &r
->from_work_format_buf_size
, 0);
1341 src
= pa_memblock_acquire_chunk(input
);
1342 dst
= pa_memblock_acquire(r
->from_work_format_buf
.memblock
);
1343 r
->from_work_format_func(n_samples
, src
, dst
);
1344 pa_memblock_release(input
->memblock
);
1345 pa_memblock_release(r
->from_work_format_buf
.memblock
);
1347 return &r
->from_work_format_buf
;
1350 void pa_resampler_run(pa_resampler
*r
, const pa_memchunk
*in
, pa_memchunk
*out
) {
1356 pa_assert(in
->length
);
1357 pa_assert(in
->memblock
);
1358 pa_assert(in
->length
% r
->i_fz
== 0);
1360 buf
= (pa_memchunk
*) in
;
1361 buf
= convert_to_work_format(r
, buf
);
1363 /* Try to save resampling effort: if we have more output channels than
1364 * input channels, do resampling first, then remapping. */
1365 if (r
->o_ss
.channels
<= r
->i_ss
.channels
) {
1366 buf
= remap_channels(r
, buf
);
1367 buf
= resample(r
, buf
);
1369 buf
= resample(r
, buf
);
1370 buf
= remap_channels(r
, buf
);
1374 buf
= convert_from_work_format(r
, buf
);
1378 pa_memblock_ref(buf
->memblock
);
1380 pa_memchunk_reset(buf
);
1382 pa_memchunk_reset(out
);
1385 /*** libsamplerate based implementation ***/
1387 #ifdef HAVE_LIBSAMPLERATE
1388 static unsigned libsamplerate_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1395 pa_assert(out_n_frames
);
1397 state
= r
->impl
.data
;
1398 memset(&data
, 0, sizeof(data
));
1400 data
.data_in
= pa_memblock_acquire_chunk(input
);
1401 data
.input_frames
= (long int) in_n_frames
;
1403 data
.data_out
= pa_memblock_acquire_chunk(output
);
1404 data
.output_frames
= (long int) *out_n_frames
;
1406 data
.src_ratio
= (double) r
->o_ss
.rate
/ r
->i_ss
.rate
;
1407 data
.end_of_input
= 0;
1409 pa_assert_se(src_process(state
, &data
) == 0);
1411 pa_memblock_release(input
->memblock
);
1412 pa_memblock_release(output
->memblock
);
1414 *out_n_frames
= (unsigned) data
.output_frames_gen
;
1416 return in_n_frames
- data
.input_frames_used
;
1419 static void libsamplerate_update_rates(pa_resampler
*r
) {
1423 state
= r
->impl
.data
;
1424 pa_assert_se(src_set_ratio(state
, (double) r
->o_ss
.rate
/ r
->i_ss
.rate
) == 0);
1427 static void libsamplerate_reset(pa_resampler
*r
) {
1431 state
= r
->impl
.data
;
1432 pa_assert_se(src_reset(state
) == 0);
1435 static void libsamplerate_free(pa_resampler
*r
) {
1439 state
= r
->impl
.data
;
1444 static int libsamplerate_init(pa_resampler
*r
) {
1450 if (!(state
= src_new(r
->method
, r
->work_channels
, &err
)))
1453 r
->impl
.free
= libsamplerate_free
;
1454 r
->impl
.update_rates
= libsamplerate_update_rates
;
1455 r
->impl
.resample
= libsamplerate_resample
;
1456 r
->impl
.reset
= libsamplerate_reset
;
1457 r
->impl
.data
= state
;
1464 /*** speex based implementation ***/
1466 static unsigned speex_resample_float(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1468 uint32_t inf
= in_n_frames
, outf
= *out_n_frames
;
1469 SpeexResamplerState
*state
;
1474 pa_assert(out_n_frames
);
1476 state
= r
->impl
.data
;
1478 in
= pa_memblock_acquire_chunk(input
);
1479 out
= pa_memblock_acquire_chunk(output
);
1481 pa_assert_se(speex_resampler_process_interleaved_float(state
, in
, &inf
, out
, &outf
) == 0);
1483 pa_memblock_release(input
->memblock
);
1484 pa_memblock_release(output
->memblock
);
1486 pa_assert(inf
== in_n_frames
);
1487 *out_n_frames
= outf
;
1492 static unsigned speex_resample_int(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1494 uint32_t inf
= in_n_frames
, outf
= *out_n_frames
;
1495 SpeexResamplerState
*state
;
1500 pa_assert(out_n_frames
);
1502 state
= r
->impl
.data
;
1504 in
= pa_memblock_acquire_chunk(input
);
1505 out
= pa_memblock_acquire_chunk(output
);
1507 pa_assert_se(speex_resampler_process_interleaved_int(state
, in
, &inf
, out
, &outf
) == 0);
1509 pa_memblock_release(input
->memblock
);
1510 pa_memblock_release(output
->memblock
);
1512 pa_assert(inf
== in_n_frames
);
1513 *out_n_frames
= outf
;
1518 static void speex_update_rates(pa_resampler
*r
) {
1519 SpeexResamplerState
*state
;
1522 state
= r
->impl
.data
;
1524 pa_assert_se(speex_resampler_set_rate(state
, r
->i_ss
.rate
, r
->o_ss
.rate
) == 0);
1527 static void speex_reset(pa_resampler
*r
) {
1528 SpeexResamplerState
*state
;
1531 state
= r
->impl
.data
;
1533 pa_assert_se(speex_resampler_reset_mem(state
) == 0);
1536 static void speex_free(pa_resampler
*r
) {
1537 SpeexResamplerState
*state
;
1540 state
= r
->impl
.data
;
1544 speex_resampler_destroy(state
);
1547 static int speex_init(pa_resampler
*r
) {
1549 SpeexResamplerState
*state
;
1553 r
->impl
.free
= speex_free
;
1554 r
->impl
.update_rates
= speex_update_rates
;
1555 r
->impl
.reset
= speex_reset
;
1557 if (r
->method
>= PA_RESAMPLER_SPEEX_FIXED_BASE
&& r
->method
<= PA_RESAMPLER_SPEEX_FIXED_MAX
) {
1559 q
= r
->method
- PA_RESAMPLER_SPEEX_FIXED_BASE
;
1560 r
->impl
.resample
= speex_resample_int
;
1563 pa_assert(r
->method
>= PA_RESAMPLER_SPEEX_FLOAT_BASE
&& r
->method
<= PA_RESAMPLER_SPEEX_FLOAT_MAX
);
1565 q
= r
->method
- PA_RESAMPLER_SPEEX_FLOAT_BASE
;
1566 r
->impl
.resample
= speex_resample_float
;
1569 pa_log_info("Choosing speex quality setting %i.", q
);
1571 if (!(state
= speex_resampler_init(r
->work_channels
, r
->i_ss
.rate
, r
->o_ss
.rate
, q
, &err
)))
1574 r
->impl
.data
= state
;
1580 /* Trivial implementation */
1582 static unsigned trivial_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1583 unsigned i_index
, o_index
;
1585 struct trivial_data
*trivial_data
;
1590 pa_assert(out_n_frames
);
1592 trivial_data
= r
->impl
.data
;
1594 src
= pa_memblock_acquire_chunk(input
);
1595 dst
= pa_memblock_acquire_chunk(output
);
1597 for (o_index
= 0;; o_index
++, trivial_data
->o_counter
++) {
1598 i_index
= ((uint64_t) trivial_data
->o_counter
* r
->i_ss
.rate
) / r
->o_ss
.rate
;
1599 i_index
= i_index
> trivial_data
->i_counter
? i_index
- trivial_data
->i_counter
: 0;
1601 if (i_index
>= in_n_frames
)
1604 pa_assert_fp(o_index
* r
->w_fz
< pa_memblock_get_length(output
->memblock
));
1606 memcpy((uint8_t*) dst
+ r
->w_fz
* o_index
, (uint8_t*) src
+ r
->w_fz
* i_index
, (int) r
->w_fz
);
1609 pa_memblock_release(input
->memblock
);
1610 pa_memblock_release(output
->memblock
);
1612 *out_n_frames
= o_index
;
1614 trivial_data
->i_counter
+= in_n_frames
;
1616 /* Normalize counters */
1617 while (trivial_data
->i_counter
>= r
->i_ss
.rate
) {
1618 pa_assert(trivial_data
->o_counter
>= r
->o_ss
.rate
);
1620 trivial_data
->i_counter
-= r
->i_ss
.rate
;
1621 trivial_data
->o_counter
-= r
->o_ss
.rate
;
1627 static void trivial_update_rates_or_reset(pa_resampler
*r
) {
1628 struct trivial_data
*trivial_data
;
1631 trivial_data
= r
->impl
.data
;
1633 trivial_data
->i_counter
= 0;
1634 trivial_data
->o_counter
= 0;
1637 static int trivial_init(pa_resampler
*r
) {
1638 struct trivial_data
*trivial_data
;
1641 trivial_data
= pa_xnew0(struct trivial_data
, 1);
1643 r
->impl
.resample
= trivial_resample
;
1644 r
->impl
.update_rates
= trivial_update_rates_or_reset
;
1645 r
->impl
.reset
= trivial_update_rates_or_reset
;
1646 r
->impl
.data
= trivial_data
;
1651 /* Peak finder implementation */
1653 static unsigned peaks_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1654 unsigned c
, o_index
= 0;
1655 unsigned i
, i_end
= 0;
1657 struct peaks_data
*peaks_data
;
1662 pa_assert(out_n_frames
);
1664 peaks_data
= r
->impl
.data
;
1665 src
= pa_memblock_acquire_chunk(input
);
1666 dst
= pa_memblock_acquire_chunk(output
);
1668 i
= ((uint64_t) peaks_data
->o_counter
* r
->i_ss
.rate
) / r
->o_ss
.rate
;
1669 i
= i
> peaks_data
->i_counter
? i
- peaks_data
->i_counter
: 0;
1671 while (i_end
< in_n_frames
) {
1672 i_end
= ((uint64_t) (peaks_data
->o_counter
+ 1) * r
->i_ss
.rate
) / r
->o_ss
.rate
;
1673 i_end
= i_end
> peaks_data
->i_counter
? i_end
- peaks_data
->i_counter
: 0;
1675 pa_assert_fp(o_index
* r
->w_fz
< pa_memblock_get_length(output
->memblock
));
1677 /* 1ch float is treated separately, because that is the common case */
1678 if (r
->work_channels
== 1 && r
->work_format
== PA_SAMPLE_FLOAT32NE
) {
1679 float *s
= (float*) src
+ i
;
1680 float *d
= (float*) dst
+ o_index
;
1682 for (; i
< i_end
&& i
< in_n_frames
; i
++) {
1683 float n
= fabsf(*s
++);
1685 if (n
> peaks_data
->max_f
[0])
1686 peaks_data
->max_f
[0] = n
;
1690 *d
= peaks_data
->max_f
[0];
1691 peaks_data
->max_f
[0] = 0;
1692 o_index
++, peaks_data
->o_counter
++;
1694 } else if (r
->work_format
== PA_SAMPLE_S16NE
) {
1695 int16_t *s
= (int16_t*) src
+ r
->work_channels
* i
;
1696 int16_t *d
= (int16_t*) dst
+ r
->work_channels
* o_index
;
1698 for (; i
< i_end
&& i
< in_n_frames
; i
++)
1699 for (c
= 0; c
< r
->work_channels
; c
++) {
1700 int16_t n
= abs(*s
++);
1702 if (n
> peaks_data
->max_i
[c
])
1703 peaks_data
->max_i
[c
] = n
;
1707 for (c
= 0; c
< r
->work_channels
; c
++, d
++) {
1708 *d
= peaks_data
->max_i
[c
];
1709 peaks_data
->max_i
[c
] = 0;
1711 o_index
++, peaks_data
->o_counter
++;
1714 float *s
= (float*) src
+ r
->work_channels
* i
;
1715 float *d
= (float*) dst
+ r
->work_channels
* o_index
;
1717 for (; i
< i_end
&& i
< in_n_frames
; i
++)
1718 for (c
= 0; c
< r
->work_channels
; c
++) {
1719 float n
= fabsf(*s
++);
1721 if (n
> peaks_data
->max_f
[c
])
1722 peaks_data
->max_f
[c
] = n
;
1726 for (c
= 0; c
< r
->work_channels
; c
++, d
++) {
1727 *d
= peaks_data
->max_f
[c
];
1728 peaks_data
->max_f
[c
] = 0;
1730 o_index
++, peaks_data
->o_counter
++;
1735 pa_memblock_release(input
->memblock
);
1736 pa_memblock_release(output
->memblock
);
1738 *out_n_frames
= o_index
;
1740 peaks_data
->i_counter
+= in_n_frames
;
1742 /* Normalize counters */
1743 while (peaks_data
->i_counter
>= r
->i_ss
.rate
) {
1744 pa_assert(peaks_data
->o_counter
>= r
->o_ss
.rate
);
1746 peaks_data
->i_counter
-= r
->i_ss
.rate
;
1747 peaks_data
->o_counter
-= r
->o_ss
.rate
;
1753 static void peaks_update_rates_or_reset(pa_resampler
*r
) {
1754 struct peaks_data
*peaks_data
;
1757 peaks_data
= r
->impl
.data
;
1759 peaks_data
->i_counter
= 0;
1760 peaks_data
->o_counter
= 0;
1763 static int peaks_init(pa_resampler
*r
) {
1764 struct peaks_data
*peaks_data
;
1766 pa_assert(r
->i_ss
.rate
>= r
->o_ss
.rate
);
1767 pa_assert(r
->work_format
== PA_SAMPLE_S16NE
|| r
->work_format
== PA_SAMPLE_FLOAT32NE
);
1769 peaks_data
= pa_xnew0(struct peaks_data
, 1);
1771 r
->impl
.resample
= peaks_resample
;
1772 r
->impl
.update_rates
= peaks_update_rates_or_reset
;
1773 r
->impl
.reset
= peaks_update_rates_or_reset
;
1774 r
->impl
.data
= peaks_data
;
1779 /*** ffmpeg based implementation ***/
1781 static unsigned ffmpeg_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1782 unsigned used_frames
= 0, c
;
1783 int previous_consumed_frames
= -1;
1784 struct ffmpeg_data
*ffmpeg_data
;
1789 pa_assert(out_n_frames
);
1791 ffmpeg_data
= r
->impl
.data
;
1793 for (c
= 0; c
< r
->work_channels
; c
++) {
1796 int16_t *p
, *t
, *k
, *q
, *s
;
1797 int consumed_frames
;
1799 /* Allocate a new block */
1800 b
= pa_memblock_new(r
->mempool
, in_n_frames
* sizeof(int16_t));
1801 p
= pa_memblock_acquire(b
);
1803 /* Now copy the input data, splitting up channels */
1804 t
= (int16_t*) pa_memblock_acquire_chunk(input
) + c
;
1806 for (u
= 0; u
< in_n_frames
; u
++) {
1808 t
+= r
->work_channels
;
1811 pa_memblock_release(input
->memblock
);
1813 /* Allocate buffer for the result */
1814 w
= pa_memblock_new(r
->mempool
, *out_n_frames
* sizeof(int16_t));
1815 q
= pa_memblock_acquire(w
);
1818 used_frames
= (unsigned) av_resample(ffmpeg_data
->state
,
1821 (int) in_n_frames
, (int) *out_n_frames
,
1822 c
>= (unsigned) (r
->work_channels
-1));
1824 pa_memblock_release(b
);
1825 pa_memblock_unref(b
);
1827 pa_assert(consumed_frames
<= (int) in_n_frames
);
1828 pa_assert(previous_consumed_frames
== -1 || consumed_frames
== previous_consumed_frames
);
1829 previous_consumed_frames
= consumed_frames
;
1831 /* And place the results in the output buffer */
1832 s
= (int16_t *) pa_memblock_acquire_chunk(output
) + c
;
1833 for (u
= 0; u
< used_frames
; u
++) {
1836 s
+= r
->work_channels
;
1838 pa_memblock_release(output
->memblock
);
1839 pa_memblock_release(w
);
1840 pa_memblock_unref(w
);
1843 *out_n_frames
= used_frames
;
1845 return in_n_frames
- previous_consumed_frames
;
1848 static void ffmpeg_free(pa_resampler
*r
) {
1849 struct ffmpeg_data
*ffmpeg_data
;
1853 ffmpeg_data
= r
->impl
.data
;
1854 if (ffmpeg_data
->state
)
1855 av_resample_close(ffmpeg_data
->state
);
1858 static int ffmpeg_init(pa_resampler
*r
) {
1859 struct ffmpeg_data
*ffmpeg_data
;
1863 ffmpeg_data
= pa_xnew(struct ffmpeg_data
, 1);
1865 /* We could probably implement different quality levels by
1866 * adjusting the filter parameters here. However, ffmpeg
1867 * internally only uses these hardcoded values, so let's use them
1868 * here for now as well until ffmpeg makes this configurable. */
1870 if (!(ffmpeg_data
->state
= av_resample_init((int) r
->o_ss
.rate
, (int) r
->i_ss
.rate
, 16, 10, 0, 0.8)))
1873 r
->impl
.free
= ffmpeg_free
;
1874 r
->impl
.resample
= ffmpeg_resample
;
1875 r
->impl
.data
= (void *) ffmpeg_data
;
1880 /*** copy (noop) implementation ***/
1882 static int copy_init(pa_resampler
*r
) {
1885 pa_assert(r
->o_ss
.rate
== r
->i_ss
.rate
);