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 */
69 pa_memchunk
*leftover_buf
;
70 size_t *leftover_buf_size
;
72 /* have_leftover points to leftover_in_remap */
74 bool leftover_in_remap
;
76 pa_sample_format_t work_format
;
77 uint8_t work_channels
;
79 pa_convert_func_t to_work_format_func
;
80 pa_convert_func_t from_work_format_func
;
85 pa_resampler_impl impl
;
88 struct trivial_data
{ /* data specific to the trivial resampler */
93 struct peaks_data
{ /* data specific to the peak finder pseudo resampler */
97 float max_f
[PA_CHANNELS_MAX
];
98 int16_t max_i
[PA_CHANNELS_MAX
];
101 struct ffmpeg_data
{ /* data specific to ffmpeg */
102 struct AVResampleContext
*state
;
105 static int copy_init(pa_resampler
*r
);
106 static int trivial_init(pa_resampler
*r
);
108 static int speex_init(pa_resampler
*r
);
110 static int ffmpeg_init(pa_resampler
*r
);
111 static int peaks_init(pa_resampler
*r
);
112 #ifdef HAVE_LIBSAMPLERATE
113 static int libsamplerate_init(pa_resampler
*r
);
116 static void calc_map_table(pa_resampler
*r
);
118 static int (* const init_table
[])(pa_resampler
*r
) = {
119 #ifdef HAVE_LIBSAMPLERATE
120 [PA_RESAMPLER_SRC_SINC_BEST_QUALITY
] = libsamplerate_init
,
121 [PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY
] = libsamplerate_init
,
122 [PA_RESAMPLER_SRC_SINC_FASTEST
] = libsamplerate_init
,
123 [PA_RESAMPLER_SRC_ZERO_ORDER_HOLD
] = libsamplerate_init
,
124 [PA_RESAMPLER_SRC_LINEAR
] = libsamplerate_init
,
126 [PA_RESAMPLER_SRC_SINC_BEST_QUALITY
] = NULL
,
127 [PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY
] = NULL
,
128 [PA_RESAMPLER_SRC_SINC_FASTEST
] = NULL
,
129 [PA_RESAMPLER_SRC_ZERO_ORDER_HOLD
] = NULL
,
130 [PA_RESAMPLER_SRC_LINEAR
] = NULL
,
132 [PA_RESAMPLER_TRIVIAL
] = trivial_init
,
134 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+0] = speex_init
,
135 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+1] = speex_init
,
136 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+2] = speex_init
,
137 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+3] = speex_init
,
138 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+4] = speex_init
,
139 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+5] = speex_init
,
140 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+6] = speex_init
,
141 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+7] = speex_init
,
142 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+8] = speex_init
,
143 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+9] = speex_init
,
144 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+10] = speex_init
,
145 [PA_RESAMPLER_SPEEX_FIXED_BASE
+0] = speex_init
,
146 [PA_RESAMPLER_SPEEX_FIXED_BASE
+1] = speex_init
,
147 [PA_RESAMPLER_SPEEX_FIXED_BASE
+2] = speex_init
,
148 [PA_RESAMPLER_SPEEX_FIXED_BASE
+3] = speex_init
,
149 [PA_RESAMPLER_SPEEX_FIXED_BASE
+4] = speex_init
,
150 [PA_RESAMPLER_SPEEX_FIXED_BASE
+5] = speex_init
,
151 [PA_RESAMPLER_SPEEX_FIXED_BASE
+6] = speex_init
,
152 [PA_RESAMPLER_SPEEX_FIXED_BASE
+7] = speex_init
,
153 [PA_RESAMPLER_SPEEX_FIXED_BASE
+8] = speex_init
,
154 [PA_RESAMPLER_SPEEX_FIXED_BASE
+9] = speex_init
,
155 [PA_RESAMPLER_SPEEX_FIXED_BASE
+10] = speex_init
,
157 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+0] = NULL
,
158 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+1] = NULL
,
159 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+2] = NULL
,
160 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+3] = NULL
,
161 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+4] = NULL
,
162 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+5] = NULL
,
163 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+6] = NULL
,
164 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+7] = NULL
,
165 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+8] = NULL
,
166 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+9] = NULL
,
167 [PA_RESAMPLER_SPEEX_FLOAT_BASE
+10] = NULL
,
168 [PA_RESAMPLER_SPEEX_FIXED_BASE
+0] = NULL
,
169 [PA_RESAMPLER_SPEEX_FIXED_BASE
+1] = NULL
,
170 [PA_RESAMPLER_SPEEX_FIXED_BASE
+2] = NULL
,
171 [PA_RESAMPLER_SPEEX_FIXED_BASE
+3] = NULL
,
172 [PA_RESAMPLER_SPEEX_FIXED_BASE
+4] = NULL
,
173 [PA_RESAMPLER_SPEEX_FIXED_BASE
+5] = NULL
,
174 [PA_RESAMPLER_SPEEX_FIXED_BASE
+6] = NULL
,
175 [PA_RESAMPLER_SPEEX_FIXED_BASE
+7] = NULL
,
176 [PA_RESAMPLER_SPEEX_FIXED_BASE
+8] = NULL
,
177 [PA_RESAMPLER_SPEEX_FIXED_BASE
+9] = NULL
,
178 [PA_RESAMPLER_SPEEX_FIXED_BASE
+10] = NULL
,
180 [PA_RESAMPLER_FFMPEG
] = ffmpeg_init
,
181 [PA_RESAMPLER_AUTO
] = NULL
,
182 [PA_RESAMPLER_COPY
] = copy_init
,
183 [PA_RESAMPLER_PEAKS
] = peaks_init
,
186 static pa_resample_method_t
choose_auto_resampler(pa_resample_flags_t flags
) {
187 pa_resample_method_t method
;
189 if (pa_resample_method_supported(PA_RESAMPLER_SPEEX_FLOAT_BASE
+ 1))
190 method
= PA_RESAMPLER_SPEEX_FLOAT_BASE
+ 1;
191 else if (flags
& PA_RESAMPLER_VARIABLE_RATE
)
192 method
= PA_RESAMPLER_TRIVIAL
;
194 method
= PA_RESAMPLER_FFMPEG
;
199 static pa_resample_method_t
pa_resampler_fix_method(
200 pa_resample_flags_t flags
,
201 pa_resample_method_t method
,
202 const uint32_t rate_a
,
203 const uint32_t rate_b
) {
205 pa_assert(pa_sample_rate_valid(rate_a
));
206 pa_assert(pa_sample_rate_valid(rate_b
));
207 pa_assert(method
>= 0);
208 pa_assert(method
< PA_RESAMPLER_MAX
);
210 if (!(flags
& PA_RESAMPLER_VARIABLE_RATE
) && rate_a
== rate_b
) {
211 pa_log_info("Forcing resampler 'copy', because of fixed, identical sample rates.");
212 method
= PA_RESAMPLER_COPY
;
215 if (!pa_resample_method_supported(method
)) {
216 pa_log_warn("Support for resampler '%s' not compiled in, reverting to 'auto'.", pa_resample_method_to_string(method
));
217 method
= PA_RESAMPLER_AUTO
;
221 case PA_RESAMPLER_COPY
:
222 if (rate_a
!= rate_b
) {
223 pa_log_info("Resampler 'copy' cannot change sampling rate, reverting to resampler 'auto'.");
224 method
= PA_RESAMPLER_AUTO
;
227 /* Else fall through */
228 case PA_RESAMPLER_FFMPEG
:
229 if (flags
& PA_RESAMPLER_VARIABLE_RATE
) {
230 pa_log_info("Resampler '%s' cannot do variable rate, reverting to resampler 'auto'.", pa_resample_method_to_string(method
));
231 method
= PA_RESAMPLER_AUTO
;
235 /* The Peaks resampler only supports downsampling.
236 * Revert to auto if we are upsampling */
237 case PA_RESAMPLER_PEAKS
:
238 if (rate_a
< rate_b
) {
239 pa_log_warn("The 'peaks' resampler only supports downsampling, reverting to resampler 'auto'.");
240 method
= PA_RESAMPLER_AUTO
;
248 if (method
== PA_RESAMPLER_AUTO
)
249 method
= choose_auto_resampler(flags
);
254 /* Return true if a is a more precise sample format than b, else return false */
255 static bool sample_format_more_precise(pa_sample_format_t a
, pa_sample_format_t b
) {
256 pa_assert(pa_sample_format_valid(a
));
257 pa_assert(pa_sample_format_valid(b
));
266 case PA_SAMPLE_S16LE
:
267 case PA_SAMPLE_S16BE
:
268 if (b
== PA_SAMPLE_ULAW
|| b
== PA_SAMPLE_ALAW
|| b
== PA_SAMPLE_U8
)
274 case PA_SAMPLE_S24LE
:
275 case PA_SAMPLE_S24BE
:
276 case PA_SAMPLE_S24_32LE
:
277 case PA_SAMPLE_S24_32BE
:
278 if (b
== PA_SAMPLE_ULAW
|| b
== PA_SAMPLE_ALAW
|| b
== PA_SAMPLE_U8
||
279 b
== PA_SAMPLE_S16LE
|| b
== PA_SAMPLE_S16BE
)
285 case PA_SAMPLE_FLOAT32LE
:
286 case PA_SAMPLE_FLOAT32BE
:
287 case PA_SAMPLE_S32LE
:
288 case PA_SAMPLE_S32BE
:
289 if (b
== PA_SAMPLE_FLOAT32LE
|| b
== PA_SAMPLE_FLOAT32BE
||
290 b
== PA_SAMPLE_S32LE
|| b
== PA_SAMPLE_FLOAT32BE
)
301 static pa_sample_format_t
pa_resampler_choose_work_format(
302 pa_resample_method_t method
,
303 pa_sample_format_t a
,
304 pa_sample_format_t b
,
306 pa_sample_format_t work_format
;
308 pa_assert(pa_sample_format_valid(a
));
309 pa_assert(pa_sample_format_valid(b
));
310 pa_assert(method
>= 0);
311 pa_assert(method
< PA_RESAMPLER_MAX
);
313 if (method
>= PA_RESAMPLER_SPEEX_FIXED_BASE
&& method
<= PA_RESAMPLER_SPEEX_FIXED_MAX
)
314 method
= PA_RESAMPLER_SPEEX_FIXED_BASE
;
317 /* This block is for resampling functions that only
318 * support the S16 sample format. */
319 case PA_RESAMPLER_SPEEX_FIXED_BASE
: /* fall through */
320 case PA_RESAMPLER_FFMPEG
:
321 work_format
= PA_SAMPLE_S16NE
;
324 /* This block is for resampling functions that support
325 * any sample format. */
326 case PA_RESAMPLER_COPY
: /* fall through */
327 case PA_RESAMPLER_TRIVIAL
:
328 if (!map_required
&& a
== b
) {
332 /* Else fall trough */
333 case PA_RESAMPLER_PEAKS
:
334 if (a
== PA_SAMPLE_S16NE
|| b
== PA_SAMPLE_S16NE
)
335 work_format
= PA_SAMPLE_S16NE
;
336 else if (sample_format_more_precise(a
, PA_SAMPLE_S16NE
) ||
337 sample_format_more_precise(b
, PA_SAMPLE_S16NE
))
338 work_format
= PA_SAMPLE_FLOAT32NE
;
340 work_format
= PA_SAMPLE_S16NE
;
344 work_format
= PA_SAMPLE_FLOAT32NE
;
350 pa_resampler
* pa_resampler_new(
352 const pa_sample_spec
*a
,
353 const pa_channel_map
*am
,
354 const pa_sample_spec
*b
,
355 const pa_channel_map
*bm
,
356 pa_resample_method_t method
,
357 pa_resample_flags_t flags
) {
359 pa_resampler
*r
= NULL
;
364 pa_assert(pa_sample_spec_valid(a
));
365 pa_assert(pa_sample_spec_valid(b
));
366 pa_assert(method
>= 0);
367 pa_assert(method
< PA_RESAMPLER_MAX
);
369 method
= pa_resampler_fix_method(flags
, method
, a
->rate
, b
->rate
);
371 r
= pa_xnew0(pa_resampler
, 1);
376 /* Fill sample specs */
380 /* set up the remap structure */
381 r
->remap
.i_ss
= &r
->i_ss
;
382 r
->remap
.o_ss
= &r
->o_ss
;
383 r
->remap
.format
= &r
->work_format
;
387 else if (!pa_channel_map_init_auto(&r
->i_cm
, r
->i_ss
.channels
, PA_CHANNEL_MAP_DEFAULT
))
392 else if (!pa_channel_map_init_auto(&r
->o_cm
, r
->o_ss
.channels
, PA_CHANNEL_MAP_DEFAULT
))
395 r
->i_fz
= pa_frame_size(a
);
396 r
->o_fz
= pa_frame_size(b
);
400 pa_log_info("Using resampler '%s'", pa_resample_method_to_string(method
));
402 r
->work_format
= pa_resampler_choose_work_format(method
, a
->format
, b
->format
, r
->map_required
);
404 pa_log_info("Using %s as working format.", pa_sample_format_to_string(r
->work_format
));
406 r
->w_sz
= pa_sample_size_of_format(r
->work_format
);
408 if (r
->i_ss
.format
!= r
->work_format
) {
409 if (r
->work_format
== PA_SAMPLE_FLOAT32NE
) {
410 if (!(r
->to_work_format_func
= pa_get_convert_to_float32ne_function(r
->i_ss
.format
)))
413 pa_assert(r
->work_format
== PA_SAMPLE_S16NE
);
414 if (!(r
->to_work_format_func
= pa_get_convert_to_s16ne_function(r
->i_ss
.format
)))
419 if (r
->o_ss
.format
!= r
->work_format
) {
420 if (r
->work_format
== PA_SAMPLE_FLOAT32NE
) {
421 if (!(r
->from_work_format_func
= pa_get_convert_from_float32ne_function(r
->o_ss
.format
)))
424 pa_assert(r
->work_format
== PA_SAMPLE_S16NE
);
425 if (!(r
->from_work_format_func
= pa_get_convert_from_s16ne_function(r
->o_ss
.format
)))
430 /* leftover buffer is the buffer before the resampling stage */
431 r
->leftover_buf
= &r
->remap_buf
;
432 r
->leftover_buf_size
= &r
->remap_buf_size
;
433 r
->have_leftover
= &r
->leftover_in_remap
;
435 r
->work_channels
= r
->o_ss
.channels
;
436 r
->w_fz
= pa_sample_size_of_format(r
->work_format
) * r
->work_channels
;
438 /* initialize implementation */
439 if (init_table
[method
](r
) < 0)
450 void pa_resampler_free(pa_resampler
*r
) {
456 pa_xfree(r
->impl
.data
);
458 if (r
->to_work_format_buf
.memblock
)
459 pa_memblock_unref(r
->to_work_format_buf
.memblock
);
460 if (r
->remap_buf
.memblock
)
461 pa_memblock_unref(r
->remap_buf
.memblock
);
462 if (r
->resample_buf
.memblock
)
463 pa_memblock_unref(r
->resample_buf
.memblock
);
464 if (r
->from_work_format_buf
.memblock
)
465 pa_memblock_unref(r
->from_work_format_buf
.memblock
);
470 void pa_resampler_set_input_rate(pa_resampler
*r
, uint32_t rate
) {
473 pa_assert(r
->impl
.update_rates
);
475 if (r
->i_ss
.rate
== rate
)
480 r
->impl
.update_rates(r
);
483 void pa_resampler_set_output_rate(pa_resampler
*r
, uint32_t rate
) {
486 pa_assert(r
->impl
.update_rates
);
488 if (r
->o_ss
.rate
== rate
)
493 r
->impl
.update_rates(r
);
496 size_t pa_resampler_request(pa_resampler
*r
, size_t out_length
) {
499 /* Let's round up here to make it more likely that the caller will get at
500 * least out_length amount of data from pa_resampler_run().
502 * We don't take the leftover into account here. If we did, then it might
503 * be in theory possible that this function would return 0 and
504 * pa_resampler_run() would also return 0. That could lead to infinite
505 * loops. When the leftover is ignored here, such loops would eventually
506 * terminate, because the leftover would grow each round, finally
507 * surpassing the minimum input threshold of the resampler. */
508 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
;
511 size_t pa_resampler_result(pa_resampler
*r
, size_t in_length
) {
516 /* Let's round up here to ensure that the caller will always allocate big
517 * enough output buffer. */
519 frames
= (in_length
+ r
->i_fz
- 1) / r
->i_fz
;
520 if (*r
->have_leftover
)
521 frames
+= r
->leftover_buf
->length
/ r
->w_fz
;
523 return (((uint64_t) frames
* r
->o_ss
.rate
+ r
->i_ss
.rate
- 1) / r
->i_ss
.rate
) * r
->o_fz
;
526 size_t pa_resampler_max_block_size(pa_resampler
*r
) {
527 size_t block_size_max
;
528 pa_sample_spec max_ss
;
534 block_size_max
= pa_mempool_block_size_max(r
->mempool
);
536 /* We deduce the "largest" sample spec we're using during the
538 max_ss
.channels
= (uint8_t) (PA_MAX(r
->i_ss
.channels
, r
->o_ss
.channels
));
540 /* We silently assume that the format enum is ordered by size */
541 max_ss
.format
= PA_MAX(r
->i_ss
.format
, r
->o_ss
.format
);
542 max_ss
.format
= PA_MAX(max_ss
.format
, r
->work_format
);
544 max_ss
.rate
= PA_MAX(r
->i_ss
.rate
, r
->o_ss
.rate
);
546 max_fs
= pa_frame_size(&max_ss
);
547 frames
= block_size_max
/ max_fs
- EXTRA_FRAMES
;
549 pa_assert(frames
>= (r
->leftover_buf
->length
/ r
->w_fz
));
550 if (*r
->have_leftover
)
551 frames
-= r
->leftover_buf
->length
/ r
->w_fz
;
553 block_size_max
= ((uint64_t) frames
* r
->i_ss
.rate
/ max_ss
.rate
) * r
->i_fz
;
555 if (block_size_max
> 0)
556 return block_size_max
;
558 /* A single input frame may result in so much output that it doesn't
559 * fit in one standard memblock (e.g. converting 1 Hz to 44100 Hz). In
560 * this case the max block size will be set to one frame, and some
561 * memory will be probably be allocated with malloc() instead of using
564 * XXX: Should we support this case at all? We could also refuse to
565 * create resamplers whose max block size would exceed the memory pool
566 * block size. In this case also updating the resampler rate should
567 * fail if the new rate would cause an excessive max block size (in
568 * which case the stream would probably have to be killed). */
572 void pa_resampler_reset(pa_resampler
*r
) {
578 *r
->have_leftover
= false;
581 pa_resample_method_t
pa_resampler_get_method(pa_resampler
*r
) {
587 const pa_channel_map
* pa_resampler_input_channel_map(pa_resampler
*r
) {
593 const pa_sample_spec
* pa_resampler_input_sample_spec(pa_resampler
*r
) {
599 const pa_channel_map
* pa_resampler_output_channel_map(pa_resampler
*r
) {
605 const pa_sample_spec
* pa_resampler_output_sample_spec(pa_resampler
*r
) {
611 static const char * const resample_methods
[] = {
612 "src-sinc-best-quality",
613 "src-sinc-medium-quality",
615 "src-zero-order-hold",
646 const char *pa_resample_method_to_string(pa_resample_method_t m
) {
648 if (m
< 0 || m
>= PA_RESAMPLER_MAX
)
651 return resample_methods
[m
];
654 int pa_resample_method_supported(pa_resample_method_t m
) {
656 if (m
< 0 || m
>= PA_RESAMPLER_MAX
)
659 #ifndef HAVE_LIBSAMPLERATE
660 if (m
<= PA_RESAMPLER_SRC_LINEAR
)
665 if (m
>= PA_RESAMPLER_SPEEX_FLOAT_BASE
&& m
<= PA_RESAMPLER_SPEEX_FLOAT_MAX
)
667 if (m
>= PA_RESAMPLER_SPEEX_FIXED_BASE
&& m
<= PA_RESAMPLER_SPEEX_FIXED_MAX
)
674 pa_resample_method_t
pa_parse_resample_method(const char *string
) {
675 pa_resample_method_t m
;
679 for (m
= 0; m
< PA_RESAMPLER_MAX
; m
++)
680 if (pa_streq(string
, resample_methods
[m
]))
683 if (pa_streq(string
, "speex-fixed"))
684 return PA_RESAMPLER_SPEEX_FIXED_BASE
+ 1;
686 if (pa_streq(string
, "speex-float"))
687 return PA_RESAMPLER_SPEEX_FLOAT_BASE
+ 1;
689 return PA_RESAMPLER_INVALID
;
692 static bool on_left(pa_channel_position_t p
) {
695 p
== PA_CHANNEL_POSITION_FRONT_LEFT
||
696 p
== PA_CHANNEL_POSITION_REAR_LEFT
||
697 p
== PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER
||
698 p
== PA_CHANNEL_POSITION_SIDE_LEFT
||
699 p
== PA_CHANNEL_POSITION_TOP_FRONT_LEFT
||
700 p
== PA_CHANNEL_POSITION_TOP_REAR_LEFT
;
703 static bool on_right(pa_channel_position_t p
) {
706 p
== PA_CHANNEL_POSITION_FRONT_RIGHT
||
707 p
== PA_CHANNEL_POSITION_REAR_RIGHT
||
708 p
== PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER
||
709 p
== PA_CHANNEL_POSITION_SIDE_RIGHT
||
710 p
== PA_CHANNEL_POSITION_TOP_FRONT_RIGHT
||
711 p
== PA_CHANNEL_POSITION_TOP_REAR_RIGHT
;
714 static bool on_center(pa_channel_position_t p
) {
717 p
== PA_CHANNEL_POSITION_FRONT_CENTER
||
718 p
== PA_CHANNEL_POSITION_REAR_CENTER
||
719 p
== PA_CHANNEL_POSITION_TOP_CENTER
||
720 p
== PA_CHANNEL_POSITION_TOP_FRONT_CENTER
||
721 p
== PA_CHANNEL_POSITION_TOP_REAR_CENTER
;
724 static bool on_lfe(pa_channel_position_t p
) {
726 p
== PA_CHANNEL_POSITION_LFE
;
729 static bool on_front(pa_channel_position_t p
) {
731 p
== PA_CHANNEL_POSITION_FRONT_LEFT
||
732 p
== PA_CHANNEL_POSITION_FRONT_RIGHT
||
733 p
== PA_CHANNEL_POSITION_FRONT_CENTER
||
734 p
== PA_CHANNEL_POSITION_TOP_FRONT_LEFT
||
735 p
== PA_CHANNEL_POSITION_TOP_FRONT_RIGHT
||
736 p
== PA_CHANNEL_POSITION_TOP_FRONT_CENTER
||
737 p
== PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER
||
738 p
== PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER
;
741 static bool on_rear(pa_channel_position_t p
) {
743 p
== PA_CHANNEL_POSITION_REAR_LEFT
||
744 p
== PA_CHANNEL_POSITION_REAR_RIGHT
||
745 p
== PA_CHANNEL_POSITION_REAR_CENTER
||
746 p
== PA_CHANNEL_POSITION_TOP_REAR_LEFT
||
747 p
== PA_CHANNEL_POSITION_TOP_REAR_RIGHT
||
748 p
== PA_CHANNEL_POSITION_TOP_REAR_CENTER
;
751 static bool on_side(pa_channel_position_t p
) {
753 p
== PA_CHANNEL_POSITION_SIDE_LEFT
||
754 p
== PA_CHANNEL_POSITION_SIDE_RIGHT
||
755 p
== PA_CHANNEL_POSITION_TOP_CENTER
;
765 static int front_rear_side(pa_channel_position_t p
) {
775 static void calc_map_table(pa_resampler
*r
) {
778 bool ic_connected
[PA_CHANNELS_MAX
];
786 if (!(r
->map_required
= (r
->i_ss
.channels
!= r
->o_ss
.channels
|| (!(r
->flags
& PA_RESAMPLER_NO_REMAP
) && !pa_channel_map_equal(&r
->i_cm
, &r
->o_cm
)))))
791 n_oc
= r
->o_ss
.channels
;
792 n_ic
= r
->i_ss
.channels
;
794 memset(m
->map_table_f
, 0, sizeof(m
->map_table_f
));
795 memset(m
->map_table_i
, 0, sizeof(m
->map_table_i
));
797 memset(ic_connected
, 0, sizeof(ic_connected
));
798 remix
= (r
->flags
& (PA_RESAMPLER_NO_REMAP
| PA_RESAMPLER_NO_REMIX
)) == 0;
800 if (r
->flags
& PA_RESAMPLER_NO_REMAP
) {
803 for (oc
= 0; oc
< PA_MIN(n_ic
, n_oc
); oc
++)
804 m
->map_table_f
[oc
][oc
] = 1.0f
;
806 } else if (r
->flags
& PA_RESAMPLER_NO_REMIX
) {
808 for (oc
= 0; oc
< n_oc
; oc
++) {
809 pa_channel_position_t b
= r
->o_cm
.map
[oc
];
811 for (ic
= 0; ic
< n_ic
; ic
++) {
812 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
814 /* We shall not do any remixing. Hence, just check by name */
816 m
->map_table_f
[oc
][ic
] = 1.0f
;
821 /* OK, we shall do the full monty: upmixing and downmixing. Our
822 * algorithm is relatively simple, does not do spacialization, delay
823 * elements or apply lowpass filters for LFE. Patches are always
824 * welcome, though. Oh, and it doesn't do any matrix decoding. (Which
825 * probably wouldn't make any sense anyway.)
827 * This code is not idempotent: downmixing an upmixed stereo stream is
828 * not identical to the original. The volume will not match, and the
829 * two channels will be a linear combination of both.
831 * This is loosely based on random suggestions found on the Internet,
833 * http://www.halfgaar.net/surround-sound-in-linux and the alsa upmix
836 * The algorithm works basically like this:
838 * 1) Connect all channels with matching names.
841 * S:Mono: Copy into all D:channels
842 * D:Mono: Avg all S:channels
844 * 3) Mix D:Left, D:Right:
845 * D:Left: If not connected, avg all S:Left
846 * D:Right: If not connected, avg all S:Right
849 * If not connected, avg all S:Center
850 * If still not connected, avg all S:Left, S:Right
853 * If not connected, avg all S:*
855 * 6) Make sure S:Left/S:Right is used: S:Left/S:Right: If not
856 * connected, mix into all D:left and all D:right channels. Gain is
859 * 7) Make sure S:Center, S:LFE is used:
861 * S:Center, S:LFE: If not connected, mix into all D:left, all
862 * D:right, all D:center channels. Gain is 0.5 for center and 0.375
863 * for LFE. C-front is only mixed into L-front/R-front if available,
864 * otherwise into all L/R channels. Similarly for C-rear.
866 * 8) Normalize each row in the matrix such that the sum for each row is
867 * not larger than 1.0 in order to avoid clipping.
869 * S: and D: shall relate to the source resp. destination channels.
871 * Rationale: 1, 2 are probably obvious. For 3: this copies front to
872 * rear if needed. For 4: we try to find some suitable C source for C,
873 * if we don't find any, we avg L and R. For 5: LFE is mixed from all
874 * channels. For 6: the rear channels should not be dropped entirely,
875 * however have only minimal impact. For 7: movies usually encode
876 * speech on the center channel. Thus we have to make sure this channel
877 * is distributed to L and R if not available in the output. Also, LFE
878 * is used to achieve a greater dynamic range, and thus we should try
879 * to do our best to pass it to L+R.
886 ic_unconnected_left
= 0,
887 ic_unconnected_right
= 0,
888 ic_unconnected_center
= 0,
889 ic_unconnected_lfe
= 0;
890 bool ic_unconnected_center_mixed_in
= 0;
894 for (ic
= 0; ic
< n_ic
; ic
++) {
895 if (on_left(r
->i_cm
.map
[ic
]))
897 if (on_right(r
->i_cm
.map
[ic
]))
899 if (on_center(r
->i_cm
.map
[ic
]))
903 for (oc
= 0; oc
< n_oc
; oc
++) {
904 bool oc_connected
= false;
905 pa_channel_position_t b
= r
->o_cm
.map
[oc
];
907 for (ic
= 0; ic
< n_ic
; ic
++) {
908 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
910 if (a
== b
|| a
== PA_CHANNEL_POSITION_MONO
) {
911 m
->map_table_f
[oc
][ic
] = 1.0f
;
914 ic_connected
[ic
] = true;
916 else if (b
== PA_CHANNEL_POSITION_MONO
) {
917 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) n_ic
;
920 ic_connected
[ic
] = true;
925 /* Try to find matching input ports for this output port */
929 /* We are not connected and on the left side, let's
930 * average all left side input channels. */
933 for (ic
= 0; ic
< n_ic
; ic
++)
934 if (on_left(r
->i_cm
.map
[ic
])) {
935 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) ic_left
;
936 ic_connected
[ic
] = true;
939 /* We ignore the case where there is no left input channel.
940 * Something is really wrong in this case anyway. */
942 } else if (on_right(b
)) {
944 /* We are not connected and on the right side, let's
945 * average all right side input channels. */
948 for (ic
= 0; ic
< n_ic
; ic
++)
949 if (on_right(r
->i_cm
.map
[ic
])) {
950 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) ic_right
;
951 ic_connected
[ic
] = true;
954 /* We ignore the case where there is no right input
955 * channel. Something is really wrong in this case anyway.
958 } else if (on_center(b
)) {
962 /* We are not connected and at the center. Let's average
963 * all center input channels. */
965 for (ic
= 0; ic
< n_ic
; ic
++)
966 if (on_center(r
->i_cm
.map
[ic
])) {
967 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) ic_center
;
968 ic_connected
[ic
] = true;
971 } else if (ic_left
+ ic_right
> 0) {
973 /* Hmm, no center channel around, let's synthesize it
974 * by mixing L and R.*/
976 for (ic
= 0; ic
< n_ic
; ic
++)
977 if (on_left(r
->i_cm
.map
[ic
]) || on_right(r
->i_cm
.map
[ic
])) {
978 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) (ic_left
+ ic_right
);
979 ic_connected
[ic
] = true;
983 /* We ignore the case where there is not even a left or
984 * right input channel. Something is really wrong in this
987 } else if (on_lfe(b
) && !(r
->flags
& PA_RESAMPLER_NO_LFE
)) {
989 /* We are not connected and an LFE. Let's average all
990 * channels for LFE. */
992 for (ic
= 0; ic
< n_ic
; ic
++)
993 m
->map_table_f
[oc
][ic
] = 1.0f
/ (float) n_ic
;
995 /* Please note that a channel connected to LFE doesn't
996 * really count as connected. */
1001 for (ic
= 0; ic
< n_ic
; ic
++) {
1002 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
1004 if (ic_connected
[ic
])
1008 ic_unconnected_left
++;
1009 else if (on_right(a
))
1010 ic_unconnected_right
++;
1011 else if (on_center(a
))
1012 ic_unconnected_center
++;
1014 ic_unconnected_lfe
++;
1017 for (ic
= 0; ic
< n_ic
; ic
++) {
1018 pa_channel_position_t a
= r
->i_cm
.map
[ic
];
1020 if (ic_connected
[ic
])
1023 for (oc
= 0; oc
< n_oc
; oc
++) {
1024 pa_channel_position_t b
= r
->o_cm
.map
[oc
];
1026 if (on_left(a
) && on_left(b
))
1027 m
->map_table_f
[oc
][ic
] = (1.f
/9.f
) / (float) ic_unconnected_left
;
1029 else if (on_right(a
) && on_right(b
))
1030 m
->map_table_f
[oc
][ic
] = (1.f
/9.f
) / (float) ic_unconnected_right
;
1032 else if (on_center(a
) && on_center(b
)) {
1033 m
->map_table_f
[oc
][ic
] = (1.f
/9.f
) / (float) ic_unconnected_center
;
1034 ic_unconnected_center_mixed_in
= true;
1036 } else if (on_lfe(a
) && !(r
->flags
& PA_RESAMPLER_NO_LFE
))
1037 m
->map_table_f
[oc
][ic
] = .375f
/ (float) ic_unconnected_lfe
;
1041 if (ic_unconnected_center
> 0 && !ic_unconnected_center_mixed_in
) {
1042 unsigned ncenter
[PA_CHANNELS_MAX
];
1043 bool found_frs
[PA_CHANNELS_MAX
];
1045 memset(ncenter
, 0, sizeof(ncenter
));
1046 memset(found_frs
, 0, sizeof(found_frs
));
1048 /* Hmm, as it appears there was no center channel we
1049 could mix our center channel in. In this case, mix it into
1050 left and right. Using .5 as the factor. */
1052 for (ic
= 0; ic
< n_ic
; ic
++) {
1054 if (ic_connected
[ic
])
1057 if (!on_center(r
->i_cm
.map
[ic
]))
1060 for (oc
= 0; oc
< n_oc
; oc
++) {
1062 if (!on_left(r
->o_cm
.map
[oc
]) && !on_right(r
->o_cm
.map
[oc
]))
1065 if (front_rear_side(r
->i_cm
.map
[ic
]) == front_rear_side(r
->o_cm
.map
[oc
])) {
1066 found_frs
[ic
] = true;
1071 for (oc
= 0; oc
< n_oc
; oc
++) {
1073 if (!on_left(r
->o_cm
.map
[oc
]) && !on_right(r
->o_cm
.map
[oc
]))
1076 if (!found_frs
[ic
] || front_rear_side(r
->i_cm
.map
[ic
]) == front_rear_side(r
->o_cm
.map
[oc
]))
1081 for (oc
= 0; oc
< n_oc
; oc
++) {
1083 if (!on_left(r
->o_cm
.map
[oc
]) && !on_right(r
->o_cm
.map
[oc
]))
1086 if (ncenter
[oc
] <= 0)
1089 for (ic
= 0; ic
< n_ic
; ic
++) {
1091 if (!on_center(r
->i_cm
.map
[ic
]))
1094 if (!found_frs
[ic
] || front_rear_side(r
->i_cm
.map
[ic
]) == front_rear_side(r
->o_cm
.map
[oc
]))
1095 m
->map_table_f
[oc
][ic
] = .5f
/ (float) ncenter
[oc
];
1101 for (oc
= 0; oc
< n_oc
; oc
++) {
1103 for (ic
= 0; ic
< n_ic
; ic
++)
1104 sum
+= m
->map_table_f
[oc
][ic
];
1107 for (ic
= 0; ic
< n_ic
; ic
++)
1108 m
->map_table_f
[oc
][ic
] /= sum
;
1111 /* make an 16:16 int version of the matrix */
1112 for (oc
= 0; oc
< n_oc
; oc
++)
1113 for (ic
= 0; ic
< n_ic
; ic
++)
1114 m
->map_table_i
[oc
][ic
] = (int32_t) (m
->map_table_f
[oc
][ic
] * 0x10000);
1116 s
= pa_strbuf_new();
1118 pa_strbuf_printf(s
, " ");
1119 for (ic
= 0; ic
< n_ic
; ic
++)
1120 pa_strbuf_printf(s
, " I%02u ", ic
);
1121 pa_strbuf_puts(s
, "\n +");
1123 for (ic
= 0; ic
< n_ic
; ic
++)
1124 pa_strbuf_printf(s
, "------");
1125 pa_strbuf_puts(s
, "\n");
1127 for (oc
= 0; oc
< n_oc
; oc
++) {
1128 pa_strbuf_printf(s
, "O%02u |", oc
);
1130 for (ic
= 0; ic
< n_ic
; ic
++)
1131 pa_strbuf_printf(s
, " %1.3f", m
->map_table_f
[oc
][ic
]);
1133 pa_strbuf_puts(s
, "\n");
1136 pa_log_debug("Channel matrix:\n%s", t
= pa_strbuf_tostring_free(s
));
1139 /* initialize the remapping function */
1143 static size_t fit_buf(pa_resampler
*r
, pa_memchunk
*buf
, size_t size
) {
1144 if (!buf
->memblock
|| size
< buf
->length
) {
1147 pa_memblock_unref(buf
->memblock
);
1149 buf
->memblock
= pa_memblock_new(r
->mempool
, size
);
1154 static pa_memchunk
* convert_to_work_format(pa_resampler
*r
, pa_memchunk
*input
) {
1160 pa_assert(input
->memblock
);
1162 /* Convert the incoming sample into the work sample format and place them
1163 * in to_work_format_buf. */
1165 if (!r
->to_work_format_func
|| !input
->length
)
1168 n_samples
= (unsigned) ((input
->length
/ r
->i_fz
) * r
->i_ss
.channels
);
1170 r
->to_work_format_buf
.length
= r
->w_sz
* n_samples
;
1171 r
->to_work_format_buf_size
= fit_buf(r
, &r
->to_work_format_buf
, r
->to_work_format_buf_size
);
1173 src
= pa_memblock_acquire_chunk(input
);
1174 dst
= pa_memblock_acquire(r
->to_work_format_buf
.memblock
);
1176 r
->to_work_format_func(n_samples
, src
, dst
);
1178 pa_memblock_release(input
->memblock
);
1179 pa_memblock_release(r
->to_work_format_buf
.memblock
);
1181 return &r
->to_work_format_buf
;
1184 static pa_memchunk
*remap_channels(pa_resampler
*r
, pa_memchunk
*input
) {
1185 unsigned in_n_samples
, out_n_samples
, in_n_frames
, out_n_frames
;
1187 size_t leftover_length
= 0;
1192 pa_assert(input
->memblock
);
1194 /* Remap channels and place the result in remap_buf. There may be leftover
1195 * data in the beginning of remap_buf. The leftover data is already
1196 * remapped, so it's not part of the input, it's part of the output. */
1198 have_leftover
= r
->leftover_in_remap
;
1199 r
->leftover_in_remap
= false;
1201 if (!have_leftover
&& (!r
->map_required
|| input
->length
<= 0))
1203 else if (input
->length
<= 0)
1204 return &r
->remap_buf
;
1206 in_n_samples
= (unsigned) (input
->length
/ r
->w_sz
);
1207 in_n_frames
= out_n_frames
= in_n_samples
/ r
->i_ss
.channels
;
1209 if (have_leftover
) {
1210 leftover_length
= r
->remap_buf
.length
;
1211 out_n_frames
+= leftover_length
/ r
->w_fz
;
1214 out_n_samples
= out_n_frames
* r
->o_ss
.channels
;
1215 r
->remap_buf
.length
= out_n_samples
* r
->w_sz
;
1217 if (have_leftover
) {
1218 if (r
->remap_buf_size
< r
->remap_buf
.length
) {
1219 pa_memblock
*new_block
= pa_memblock_new(r
->mempool
, r
->remap_buf
.length
);
1221 src
= pa_memblock_acquire(r
->remap_buf
.memblock
);
1222 dst
= pa_memblock_acquire(new_block
);
1223 memcpy(dst
, src
, leftover_length
);
1224 pa_memblock_release(r
->remap_buf
.memblock
);
1225 pa_memblock_release(new_block
);
1227 pa_memblock_unref(r
->remap_buf
.memblock
);
1228 r
->remap_buf
.memblock
= new_block
;
1229 r
->remap_buf_size
= r
->remap_buf
.length
;
1232 r
->remap_buf_size
= fit_buf(r
, &r
->remap_buf
, r
->remap_buf_size
);
1234 src
= pa_memblock_acquire_chunk(input
);
1235 dst
= (uint8_t *) pa_memblock_acquire(r
->remap_buf
.memblock
) + leftover_length
;
1237 if (r
->map_required
) {
1238 pa_remap_t
*remap
= &r
->remap
;
1240 pa_assert(remap
->do_remap
);
1241 remap
->do_remap(remap
, dst
, src
, in_n_frames
);
1244 memcpy(dst
, src
, input
->length
);
1246 pa_memblock_release(input
->memblock
);
1247 pa_memblock_release(r
->remap_buf
.memblock
);
1249 return &r
->remap_buf
;
1252 static void save_leftover(pa_resampler
*r
, void *buf
, size_t len
) {
1259 /* Store the leftover data. */
1260 r
->leftover_buf
->length
= len
;
1261 *r
->leftover_buf_size
= fit_buf(r
, r
->leftover_buf
, *r
->leftover_buf_size
);
1262 *r
->have_leftover
= true;
1264 dst
= pa_memblock_acquire(r
->leftover_buf
->memblock
);
1265 memmove(dst
, buf
, len
);
1266 pa_memblock_release(r
->leftover_buf
->memblock
);
1269 static pa_memchunk
*resample(pa_resampler
*r
, pa_memchunk
*input
) {
1270 unsigned in_n_frames
, out_n_frames
, leftover_n_frames
;
1275 /* Resample the data and place the result in resample_buf. */
1277 if (!r
->impl
.resample
|| !input
->length
)
1280 in_n_frames
= (unsigned) (input
->length
/ r
->w_fz
);
1282 out_n_frames
= ((in_n_frames
*r
->o_ss
.rate
)/r
->i_ss
.rate
)+EXTRA_FRAMES
;
1284 r
->resample_buf
.length
= r
->w_fz
* out_n_frames
;
1285 r
->resample_buf_size
= fit_buf(r
, &r
->resample_buf
, r
->resample_buf_size
);
1287 leftover_n_frames
= r
->impl
.resample(r
, input
, in_n_frames
, &r
->resample_buf
, &out_n_frames
);
1289 if (leftover_n_frames
> 0) {
1290 void *leftover_data
= (uint8_t *) pa_memblock_acquire_chunk(input
) + (in_n_frames
- leftover_n_frames
) * r
->w_fz
;
1291 save_leftover(r
, leftover_data
, leftover_n_frames
* r
->w_fz
);
1292 pa_memblock_release(input
->memblock
);
1295 r
->resample_buf
.length
= out_n_frames
* r
->w_fz
;
1297 return &r
->resample_buf
;
1300 static pa_memchunk
*convert_from_work_format(pa_resampler
*r
, pa_memchunk
*input
) {
1301 unsigned n_samples
, n_frames
;
1307 /* Convert the data into the correct sample type and place the result in
1308 * from_work_format_buf. */
1310 if (!r
->from_work_format_func
|| !input
->length
)
1313 n_samples
= (unsigned) (input
->length
/ r
->w_sz
);
1314 n_frames
= n_samples
/ r
->o_ss
.channels
;
1316 r
->from_work_format_buf
.length
= r
->o_fz
* n_frames
;
1317 r
->from_work_format_buf_size
= fit_buf(r
, &r
->from_work_format_buf
, r
->from_work_format_buf_size
);
1319 src
= pa_memblock_acquire_chunk(input
);
1320 dst
= pa_memblock_acquire(r
->from_work_format_buf
.memblock
);
1321 r
->from_work_format_func(n_samples
, src
, dst
);
1322 pa_memblock_release(input
->memblock
);
1323 pa_memblock_release(r
->from_work_format_buf
.memblock
);
1325 return &r
->from_work_format_buf
;
1328 void pa_resampler_run(pa_resampler
*r
, const pa_memchunk
*in
, pa_memchunk
*out
) {
1334 pa_assert(in
->length
);
1335 pa_assert(in
->memblock
);
1336 pa_assert(in
->length
% r
->i_fz
== 0);
1338 buf
= (pa_memchunk
*) in
;
1339 buf
= convert_to_work_format(r
, buf
);
1340 buf
= remap_channels(r
, buf
);
1341 buf
= resample(r
, buf
);
1344 buf
= convert_from_work_format(r
, buf
);
1348 pa_memblock_ref(buf
->memblock
);
1350 pa_memchunk_reset(buf
);
1352 pa_memchunk_reset(out
);
1355 /*** libsamplerate based implementation ***/
1357 #ifdef HAVE_LIBSAMPLERATE
1358 static unsigned libsamplerate_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1365 pa_assert(out_n_frames
);
1367 state
= r
->impl
.data
;
1368 memset(&data
, 0, sizeof(data
));
1370 data
.data_in
= pa_memblock_acquire_chunk(input
);
1371 data
.input_frames
= (long int) in_n_frames
;
1373 data
.data_out
= pa_memblock_acquire_chunk(output
);
1374 data
.output_frames
= (long int) *out_n_frames
;
1376 data
.src_ratio
= (double) r
->o_ss
.rate
/ r
->i_ss
.rate
;
1377 data
.end_of_input
= 0;
1379 pa_assert_se(src_process(state
, &data
) == 0);
1381 pa_memblock_release(input
->memblock
);
1382 pa_memblock_release(output
->memblock
);
1384 *out_n_frames
= (unsigned) data
.output_frames_gen
;
1386 return in_n_frames
- data
.input_frames_used
;
1389 static void libsamplerate_update_rates(pa_resampler
*r
) {
1393 state
= r
->impl
.data
;
1394 pa_assert_se(src_set_ratio(state
, (double) r
->o_ss
.rate
/ r
->i_ss
.rate
) == 0);
1397 static void libsamplerate_reset(pa_resampler
*r
) {
1401 state
= r
->impl
.data
;
1402 pa_assert_se(src_reset(state
) == 0);
1405 static void libsamplerate_free(pa_resampler
*r
) {
1409 state
= r
->impl
.data
;
1414 static int libsamplerate_init(pa_resampler
*r
) {
1420 if (!(state
= src_new(r
->method
, r
->work_channels
, &err
)))
1423 r
->impl
.free
= libsamplerate_free
;
1424 r
->impl
.update_rates
= libsamplerate_update_rates
;
1425 r
->impl
.resample
= libsamplerate_resample
;
1426 r
->impl
.reset
= libsamplerate_reset
;
1427 r
->impl
.data
= state
;
1434 /*** speex based implementation ***/
1436 static unsigned speex_resample_float(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1438 uint32_t inf
= in_n_frames
, outf
= *out_n_frames
;
1439 SpeexResamplerState
*state
;
1444 pa_assert(out_n_frames
);
1446 state
= r
->impl
.data
;
1448 in
= pa_memblock_acquire_chunk(input
);
1449 out
= pa_memblock_acquire_chunk(output
);
1451 pa_assert_se(speex_resampler_process_interleaved_float(state
, in
, &inf
, out
, &outf
) == 0);
1453 pa_memblock_release(input
->memblock
);
1454 pa_memblock_release(output
->memblock
);
1456 pa_assert(inf
== in_n_frames
);
1457 *out_n_frames
= outf
;
1462 static unsigned speex_resample_int(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1464 uint32_t inf
= in_n_frames
, outf
= *out_n_frames
;
1465 SpeexResamplerState
*state
;
1470 pa_assert(out_n_frames
);
1472 state
= r
->impl
.data
;
1474 in
= pa_memblock_acquire_chunk(input
);
1475 out
= pa_memblock_acquire_chunk(output
);
1477 pa_assert_se(speex_resampler_process_interleaved_int(state
, in
, &inf
, out
, &outf
) == 0);
1479 pa_memblock_release(input
->memblock
);
1480 pa_memblock_release(output
->memblock
);
1482 pa_assert(inf
== in_n_frames
);
1483 *out_n_frames
= outf
;
1488 static void speex_update_rates(pa_resampler
*r
) {
1489 SpeexResamplerState
*state
;
1492 state
= r
->impl
.data
;
1494 pa_assert_se(speex_resampler_set_rate(state
, r
->i_ss
.rate
, r
->o_ss
.rate
) == 0);
1497 static void speex_reset(pa_resampler
*r
) {
1498 SpeexResamplerState
*state
;
1501 state
= r
->impl
.data
;
1503 pa_assert_se(speex_resampler_reset_mem(state
) == 0);
1506 static void speex_free(pa_resampler
*r
) {
1507 SpeexResamplerState
*state
;
1510 state
= r
->impl
.data
;
1514 speex_resampler_destroy(state
);
1517 static int speex_init(pa_resampler
*r
) {
1519 SpeexResamplerState
*state
;
1523 r
->impl
.free
= speex_free
;
1524 r
->impl
.update_rates
= speex_update_rates
;
1525 r
->impl
.reset
= speex_reset
;
1527 if (r
->method
>= PA_RESAMPLER_SPEEX_FIXED_BASE
&& r
->method
<= PA_RESAMPLER_SPEEX_FIXED_MAX
) {
1529 q
= r
->method
- PA_RESAMPLER_SPEEX_FIXED_BASE
;
1530 r
->impl
.resample
= speex_resample_int
;
1533 pa_assert(r
->method
>= PA_RESAMPLER_SPEEX_FLOAT_BASE
&& r
->method
<= PA_RESAMPLER_SPEEX_FLOAT_MAX
);
1535 q
= r
->method
- PA_RESAMPLER_SPEEX_FLOAT_BASE
;
1536 r
->impl
.resample
= speex_resample_float
;
1539 pa_log_info("Choosing speex quality setting %i.", q
);
1541 if (!(state
= speex_resampler_init(r
->work_channels
, r
->i_ss
.rate
, r
->o_ss
.rate
, q
, &err
)))
1544 r
->impl
.data
= state
;
1550 /* Trivial implementation */
1552 static unsigned trivial_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1553 unsigned i_index
, o_index
;
1555 struct trivial_data
*trivial_data
;
1560 pa_assert(out_n_frames
);
1562 trivial_data
= r
->impl
.data
;
1564 src
= pa_memblock_acquire_chunk(input
);
1565 dst
= pa_memblock_acquire_chunk(output
);
1567 for (o_index
= 0;; o_index
++, trivial_data
->o_counter
++) {
1568 i_index
= ((uint64_t) trivial_data
->o_counter
* r
->i_ss
.rate
) / r
->o_ss
.rate
;
1569 i_index
= i_index
> trivial_data
->i_counter
? i_index
- trivial_data
->i_counter
: 0;
1571 if (i_index
>= in_n_frames
)
1574 pa_assert_fp(o_index
* r
->w_fz
< pa_memblock_get_length(output
->memblock
));
1576 memcpy((uint8_t*) dst
+ r
->w_fz
* o_index
, (uint8_t*) src
+ r
->w_fz
* i_index
, (int) r
->w_fz
);
1579 pa_memblock_release(input
->memblock
);
1580 pa_memblock_release(output
->memblock
);
1582 *out_n_frames
= o_index
;
1584 trivial_data
->i_counter
+= in_n_frames
;
1586 /* Normalize counters */
1587 while (trivial_data
->i_counter
>= r
->i_ss
.rate
) {
1588 pa_assert(trivial_data
->o_counter
>= r
->o_ss
.rate
);
1590 trivial_data
->i_counter
-= r
->i_ss
.rate
;
1591 trivial_data
->o_counter
-= r
->o_ss
.rate
;
1597 static void trivial_update_rates_or_reset(pa_resampler
*r
) {
1598 struct trivial_data
*trivial_data
;
1601 trivial_data
= r
->impl
.data
;
1603 trivial_data
->i_counter
= 0;
1604 trivial_data
->o_counter
= 0;
1607 static int trivial_init(pa_resampler
*r
) {
1608 struct trivial_data
*trivial_data
;
1611 trivial_data
= pa_xnew0(struct trivial_data
, 1);
1613 r
->impl
.resample
= trivial_resample
;
1614 r
->impl
.update_rates
= trivial_update_rates_or_reset
;
1615 r
->impl
.reset
= trivial_update_rates_or_reset
;
1616 r
->impl
.data
= trivial_data
;
1621 /* Peak finder implementation */
1623 static unsigned peaks_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1624 unsigned c
, o_index
= 0;
1625 unsigned i
, i_end
= 0;
1627 struct peaks_data
*peaks_data
;
1632 pa_assert(out_n_frames
);
1634 peaks_data
= r
->impl
.data
;
1635 src
= pa_memblock_acquire_chunk(input
);
1636 dst
= pa_memblock_acquire_chunk(output
);
1638 i
= ((uint64_t) peaks_data
->o_counter
* r
->i_ss
.rate
) / r
->o_ss
.rate
;
1639 i
= i
> peaks_data
->i_counter
? i
- peaks_data
->i_counter
: 0;
1641 while (i_end
< in_n_frames
) {
1642 i_end
= ((uint64_t) (peaks_data
->o_counter
+ 1) * r
->i_ss
.rate
) / r
->o_ss
.rate
;
1643 i_end
= i_end
> peaks_data
->i_counter
? i_end
- peaks_data
->i_counter
: 0;
1645 pa_assert_fp(o_index
* r
->w_fz
< pa_memblock_get_length(output
->memblock
));
1647 /* 1ch float is treated separately, because that is the common case */
1648 if (r
->work_channels
== 1 && r
->work_format
== PA_SAMPLE_FLOAT32NE
) {
1649 float *s
= (float*) src
+ i
;
1650 float *d
= (float*) dst
+ o_index
;
1652 for (; i
< i_end
&& i
< in_n_frames
; i
++) {
1653 float n
= fabsf(*s
++);
1655 if (n
> peaks_data
->max_f
[0])
1656 peaks_data
->max_f
[0] = n
;
1660 *d
= peaks_data
->max_f
[0];
1661 peaks_data
->max_f
[0] = 0;
1662 o_index
++, peaks_data
->o_counter
++;
1664 } else if (r
->work_format
== PA_SAMPLE_S16NE
) {
1665 int16_t *s
= (int16_t*) src
+ r
->work_channels
* i
;
1666 int16_t *d
= (int16_t*) dst
+ r
->work_channels
* o_index
;
1668 for (; i
< i_end
&& i
< in_n_frames
; i
++)
1669 for (c
= 0; c
< r
->work_channels
; c
++) {
1670 int16_t n
= abs(*s
++);
1672 if (n
> peaks_data
->max_i
[c
])
1673 peaks_data
->max_i
[c
] = n
;
1677 for (c
= 0; c
< r
->work_channels
; c
++, d
++) {
1678 *d
= peaks_data
->max_i
[c
];
1679 peaks_data
->max_i
[c
] = 0;
1681 o_index
++, peaks_data
->o_counter
++;
1684 float *s
= (float*) src
+ r
->work_channels
* i
;
1685 float *d
= (float*) dst
+ r
->work_channels
* o_index
;
1687 for (; i
< i_end
&& i
< in_n_frames
; i
++)
1688 for (c
= 0; c
< r
->work_channels
; c
++) {
1689 float n
= fabsf(*s
++);
1691 if (n
> peaks_data
->max_f
[c
])
1692 peaks_data
->max_f
[c
] = n
;
1696 for (c
= 0; c
< r
->work_channels
; c
++, d
++) {
1697 *d
= peaks_data
->max_f
[c
];
1698 peaks_data
->max_f
[c
] = 0;
1700 o_index
++, peaks_data
->o_counter
++;
1705 pa_memblock_release(input
->memblock
);
1706 pa_memblock_release(output
->memblock
);
1708 *out_n_frames
= o_index
;
1710 peaks_data
->i_counter
+= in_n_frames
;
1712 /* Normalize counters */
1713 while (peaks_data
->i_counter
>= r
->i_ss
.rate
) {
1714 pa_assert(peaks_data
->o_counter
>= r
->o_ss
.rate
);
1716 peaks_data
->i_counter
-= r
->i_ss
.rate
;
1717 peaks_data
->o_counter
-= r
->o_ss
.rate
;
1723 static void peaks_update_rates_or_reset(pa_resampler
*r
) {
1724 struct peaks_data
*peaks_data
;
1727 peaks_data
= r
->impl
.data
;
1729 peaks_data
->i_counter
= 0;
1730 peaks_data
->o_counter
= 0;
1733 static int peaks_init(pa_resampler
*r
) {
1734 struct peaks_data
*peaks_data
;
1736 pa_assert(r
->i_ss
.rate
>= r
->o_ss
.rate
);
1737 pa_assert(r
->work_format
== PA_SAMPLE_S16NE
|| r
->work_format
== PA_SAMPLE_FLOAT32NE
);
1739 peaks_data
= pa_xnew0(struct peaks_data
, 1);
1741 r
->impl
.resample
= peaks_resample
;
1742 r
->impl
.update_rates
= peaks_update_rates_or_reset
;
1743 r
->impl
.reset
= peaks_update_rates_or_reset
;
1744 r
->impl
.data
= peaks_data
;
1749 /*** ffmpeg based implementation ***/
1751 static unsigned ffmpeg_resample(pa_resampler
*r
, const pa_memchunk
*input
, unsigned in_n_frames
, pa_memchunk
*output
, unsigned *out_n_frames
) {
1752 unsigned used_frames
= 0, c
;
1753 int previous_consumed_frames
= -1;
1754 struct ffmpeg_data
*ffmpeg_data
;
1759 pa_assert(out_n_frames
);
1761 ffmpeg_data
= r
->impl
.data
;
1763 for (c
= 0; c
< r
->work_channels
; c
++) {
1766 int16_t *p
, *t
, *k
, *q
, *s
;
1767 int consumed_frames
;
1769 /* Allocate a new block */
1770 b
= pa_memblock_new(r
->mempool
, in_n_frames
* sizeof(int16_t));
1771 p
= pa_memblock_acquire(b
);
1773 /* Now copy the input data, splitting up channels */
1774 t
= (int16_t*) pa_memblock_acquire_chunk(input
) + c
;
1776 for (u
= 0; u
< in_n_frames
; u
++) {
1778 t
+= r
->work_channels
;
1781 pa_memblock_release(input
->memblock
);
1783 /* Allocate buffer for the result */
1784 w
= pa_memblock_new(r
->mempool
, *out_n_frames
* sizeof(int16_t));
1785 q
= pa_memblock_acquire(w
);
1788 used_frames
= (unsigned) av_resample(ffmpeg_data
->state
,
1791 (int) in_n_frames
, (int) *out_n_frames
,
1792 c
>= (unsigned) (r
->work_channels
-1));
1794 pa_memblock_release(b
);
1795 pa_memblock_unref(b
);
1797 pa_assert(consumed_frames
<= (int) in_n_frames
);
1798 pa_assert(previous_consumed_frames
== -1 || consumed_frames
== previous_consumed_frames
);
1799 previous_consumed_frames
= consumed_frames
;
1801 /* And place the results in the output buffer */
1802 s
= (int16_t *) pa_memblock_acquire_chunk(output
) + c
;
1803 for (u
= 0; u
< used_frames
; u
++) {
1806 s
+= r
->work_channels
;
1808 pa_memblock_release(output
->memblock
);
1809 pa_memblock_release(w
);
1810 pa_memblock_unref(w
);
1813 *out_n_frames
= used_frames
;
1815 return in_n_frames
- previous_consumed_frames
;
1818 static void ffmpeg_free(pa_resampler
*r
) {
1819 struct ffmpeg_data
*ffmpeg_data
;
1823 ffmpeg_data
= r
->impl
.data
;
1824 if (ffmpeg_data
->state
)
1825 av_resample_close(ffmpeg_data
->state
);
1828 static int ffmpeg_init(pa_resampler
*r
) {
1829 struct ffmpeg_data
*ffmpeg_data
;
1833 ffmpeg_data
= pa_xnew(struct ffmpeg_data
, 1);
1835 /* We could probably implement different quality levels by
1836 * adjusting the filter parameters here. However, ffmpeg
1837 * internally only uses these hardcoded values, so let's use them
1838 * here for now as well until ffmpeg makes this configurable. */
1840 if (!(ffmpeg_data
->state
= av_resample_init((int) r
->o_ss
.rate
, (int) r
->i_ss
.rate
, 16, 10, 0, 0.8)))
1843 r
->impl
.free
= ffmpeg_free
;
1844 r
->impl
.resample
= ffmpeg_resample
;
1845 r
->impl
.data
= (void *) ffmpeg_data
;
1850 /*** copy (noop) implementation ***/
1852 static int copy_init(pa_resampler
*r
) {
1855 pa_assert(r
->o_ss
.rate
== r
->i_ss
.rate
);