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-rw-r--r--src/pulsecore/resampler.c1527
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diff --git a/src/pulsecore/resampler.c b/src/pulsecore/resampler.c
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+++ b/src/pulsecore/resampler.c
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+/* $Id$ */
+
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2004-2006 Lennart Poettering
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2 of the License,
+ or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+
+#if HAVE_LIBSAMPLERATE
+#include <samplerate.h>
+#endif
+
+#include <liboil/liboilfuncs.h>
+#include <liboil/liboil.h>
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/sconv.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/strbuf.h>
+
+#include "speexwrap.h"
+
+#include "ffmpeg/avcodec.h"
+
+#include "resampler.h"
+
+/* Number of samples of extra space we allow the resamplers to return */
+#define EXTRA_SAMPLES 128
+
+struct pa_resampler {
+ pa_resample_method_t method;
+ pa_resample_flags_t flags;
+
+ pa_sample_spec i_ss, o_ss;
+ pa_channel_map i_cm, o_cm;
+ size_t i_fz, o_fz, w_sz;
+ pa_mempool *mempool;
+
+ pa_memchunk buf1, buf2, buf3, buf4;
+ unsigned buf1_samples, buf2_samples, buf3_samples, buf4_samples;
+
+ pa_sample_format_t work_format;
+
+ pa_convert_func_t to_work_format_func;
+ pa_convert_func_t from_work_format_func;
+
+ float map_table[PA_CHANNELS_MAX][PA_CHANNELS_MAX];
+ pa_bool_t map_required;
+
+ void (*impl_free)(pa_resampler *r);
+ void (*impl_update_rates)(pa_resampler *r);
+ void (*impl_resample)(pa_resampler *r, const pa_memchunk *in, unsigned in_samples, pa_memchunk *out, unsigned *out_samples);
+ void (*impl_reset)(pa_resampler *r);
+
+ struct { /* data specific to the trivial resampler */
+ unsigned o_counter;
+ unsigned i_counter;
+ } trivial;
+
+#ifdef HAVE_LIBSAMPLERATE
+ struct { /* data specific to libsamplerate */
+ SRC_STATE *state;
+ } src;
+#endif
+
+ struct { /* data specific to speex */
+ SpeexResamplerState* state;
+ } speex;
+
+ struct { /* data specific to ffmpeg */
+ struct AVResampleContext *state;
+ pa_memchunk buf[PA_CHANNELS_MAX];
+ } ffmpeg;
+};
+
+static int copy_init(pa_resampler *r);
+static int trivial_init(pa_resampler*r);
+static int speex_init(pa_resampler*r);
+static int ffmpeg_init(pa_resampler*r);
+#ifdef HAVE_LIBSAMPLERATE
+static int libsamplerate_init(pa_resampler*r);
+#endif
+
+static void calc_map_table(pa_resampler *r);
+
+static int (* const init_table[])(pa_resampler*r) = {
+#ifdef HAVE_LIBSAMPLERATE
+ [PA_RESAMPLER_SRC_SINC_BEST_QUALITY] = libsamplerate_init,
+ [PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY] = libsamplerate_init,
+ [PA_RESAMPLER_SRC_SINC_FASTEST] = libsamplerate_init,
+ [PA_RESAMPLER_SRC_ZERO_ORDER_HOLD] = libsamplerate_init,
+ [PA_RESAMPLER_SRC_LINEAR] = libsamplerate_init,
+#else
+ [PA_RESAMPLER_SRC_SINC_BEST_QUALITY] = NULL,
+ [PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY] = NULL,
+ [PA_RESAMPLER_SRC_SINC_FASTEST] = NULL,
+ [PA_RESAMPLER_SRC_ZERO_ORDER_HOLD] = NULL,
+ [PA_RESAMPLER_SRC_LINEAR] = NULL,
+#endif
+ [PA_RESAMPLER_TRIVIAL] = trivial_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+0] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+1] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+2] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+3] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+4] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+5] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+6] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+7] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+8] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+9] = speex_init,
+ [PA_RESAMPLER_SPEEX_FLOAT_BASE+10] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+0] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+1] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+2] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+3] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+4] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+5] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+6] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+7] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+8] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+9] = speex_init,
+ [PA_RESAMPLER_SPEEX_FIXED_BASE+10] = speex_init,
+ [PA_RESAMPLER_FFMPEG] = ffmpeg_init,
+ [PA_RESAMPLER_AUTO] = NULL,
+ [PA_RESAMPLER_COPY] = copy_init
+};
+
+static inline size_t sample_size(pa_sample_format_t f) {
+ pa_sample_spec ss = {
+ .format = f,
+ .rate = 0,
+ .channels = 1
+ };
+
+ return pa_sample_size(&ss);
+}
+
+pa_resampler* pa_resampler_new(
+ pa_mempool *pool,
+ const pa_sample_spec *a,
+ const pa_channel_map *am,
+ const pa_sample_spec *b,
+ const pa_channel_map *bm,
+ pa_resample_method_t method,
+ pa_resample_flags_t flags) {
+
+ pa_resampler *r = NULL;
+
+ pa_assert(pool);
+ pa_assert(a);
+ pa_assert(b);
+ pa_assert(pa_sample_spec_valid(a));
+ pa_assert(pa_sample_spec_valid(b));
+ pa_assert(method >= 0);
+ pa_assert(method < PA_RESAMPLER_MAX);
+
+ /* Fix method */
+
+ if (!(flags & PA_RESAMPLER_VARIABLE_RATE) && a->rate == b->rate) {
+ pa_log_info("Forcing resampler 'copy', because of fixed, identical sample rates.");
+ method = PA_RESAMPLER_COPY;
+ }
+
+ if (!pa_resample_method_supported(method)) {
+ pa_log_warn("Support for resampler '%s' not compiled in, reverting to 'auto'.", pa_resample_method_to_string(method));
+ method = PA_RESAMPLER_AUTO;
+ }
+
+ if (method == PA_RESAMPLER_FFMPEG && (flags & PA_RESAMPLER_VARIABLE_RATE)) {
+ pa_log_info("Resampler 'ffmpeg' cannot do variable rate, reverting to resampler 'auto'.");
+ method = PA_RESAMPLER_AUTO;
+ }
+
+ if (method == PA_RESAMPLER_COPY && ((flags & PA_RESAMPLER_VARIABLE_RATE) || a->rate != b->rate)) {
+ pa_log_info("Resampler 'copy' cannot change sampling rate, reverting to resampler 'auto'.");
+ method = PA_RESAMPLER_AUTO;
+ }
+
+ if (method == PA_RESAMPLER_AUTO)
+ method = PA_RESAMPLER_SPEEX_FLOAT_BASE + 3;
+
+ r = pa_xnew(pa_resampler, 1);
+ r->mempool = pool;
+ r->method = method;
+ r->flags = flags;
+
+ r->impl_free = NULL;
+ r->impl_update_rates = NULL;
+ r->impl_resample = NULL;
+ r->impl_reset = NULL;
+
+ /* Fill sample specs */
+ r->i_ss = *a;
+ r->o_ss = *b;
+
+ if (am)
+ r->i_cm = *am;
+ else if (!pa_channel_map_init_auto(&r->i_cm, r->i_ss.channels, PA_CHANNEL_MAP_DEFAULT))
+ goto fail;
+
+ if (bm)
+ r->o_cm = *bm;
+ else if (!pa_channel_map_init_auto(&r->o_cm, r->o_ss.channels, PA_CHANNEL_MAP_DEFAULT))
+ goto fail;
+
+ r->i_fz = pa_frame_size(a);
+ r->o_fz = pa_frame_size(b);
+
+ pa_memchunk_reset(&r->buf1);
+ pa_memchunk_reset(&r->buf2);
+ pa_memchunk_reset(&r->buf3);
+ pa_memchunk_reset(&r->buf4);
+
+ r->buf1_samples = r->buf2_samples = r->buf3_samples = r->buf4_samples = 0;
+
+ calc_map_table(r);
+
+ pa_log_info("Using resampler '%s'", pa_resample_method_to_string(method));
+
+ if ((method >= PA_RESAMPLER_SPEEX_FIXED_BASE && method <= PA_RESAMPLER_SPEEX_FIXED_MAX) ||
+ (method == PA_RESAMPLER_FFMPEG))
+ r->work_format = PA_SAMPLE_S16NE;
+ else if (method == PA_RESAMPLER_TRIVIAL || method == PA_RESAMPLER_COPY) {
+
+ if (r->map_required || a->format != b->format) {
+
+ if (a->format == PA_SAMPLE_S32NE || a->format == PA_SAMPLE_S32RE ||
+ a->format == PA_SAMPLE_FLOAT32NE || a->format == PA_SAMPLE_FLOAT32RE ||
+ b->format == PA_SAMPLE_S32NE || b->format == PA_SAMPLE_S32RE ||
+ b->format == PA_SAMPLE_FLOAT32NE || b->format == PA_SAMPLE_FLOAT32RE)
+ r->work_format = PA_SAMPLE_FLOAT32NE;
+ else
+ r->work_format = PA_SAMPLE_S16NE;
+
+ } else
+ r->work_format = a->format;
+
+ } else
+ r->work_format = PA_SAMPLE_FLOAT32NE;
+
+ pa_log_info("Using %s as working format.", pa_sample_format_to_string(r->work_format));
+
+ r->w_sz = sample_size(r->work_format);
+
+ if (r->i_ss.format == r->work_format)
+ r->to_work_format_func = NULL;
+ else if (r->work_format == PA_SAMPLE_FLOAT32NE) {
+ if (!(r->to_work_format_func = pa_get_convert_to_float32ne_function(r->i_ss.format)))
+ goto fail;
+ } else {
+ pa_assert(r->work_format == PA_SAMPLE_S16NE);
+ if (!(r->to_work_format_func = pa_get_convert_to_s16ne_function(r->i_ss.format)))
+ goto fail;
+ }
+
+ if (r->o_ss.format == r->work_format)
+ r->from_work_format_func = NULL;
+ else if (r->work_format == PA_SAMPLE_FLOAT32NE) {
+ if (!(r->from_work_format_func = pa_get_convert_from_float32ne_function(r->o_ss.format)))
+ goto fail;
+ } else {
+ pa_assert(r->work_format == PA_SAMPLE_S16NE);
+ if (!(r->from_work_format_func = pa_get_convert_from_s16ne_function(r->o_ss.format)))
+ goto fail;
+ }
+
+ /* initialize implementation */
+ if (init_table[method](r) < 0)
+ goto fail;
+
+ return r;
+
+fail:
+ if (r)
+ pa_xfree(r);
+
+ return NULL;
+}
+
+void pa_resampler_free(pa_resampler *r) {
+ pa_assert(r);
+
+ if (r->impl_free)
+ r->impl_free(r);
+
+ if (r->buf1.memblock)
+ pa_memblock_unref(r->buf1.memblock);
+ if (r->buf2.memblock)
+ pa_memblock_unref(r->buf2.memblock);
+ if (r->buf3.memblock)
+ pa_memblock_unref(r->buf3.memblock);
+ if (r->buf4.memblock)
+ pa_memblock_unref(r->buf4.memblock);
+
+ pa_xfree(r);
+}
+
+void pa_resampler_set_input_rate(pa_resampler *r, uint32_t rate) {
+ pa_assert(r);
+ pa_assert(rate > 0);
+
+ if (r->i_ss.rate == rate)
+ return;
+
+ r->i_ss.rate = rate;
+
+ r->impl_update_rates(r);
+}
+
+void pa_resampler_set_output_rate(pa_resampler *r, uint32_t rate) {
+ pa_assert(r);
+ pa_assert(rate > 0);
+
+ if (r->o_ss.rate == rate)
+ return;
+
+ r->o_ss.rate = rate;
+
+ r->impl_update_rates(r);
+}
+
+size_t pa_resampler_request(pa_resampler *r, size_t out_length) {
+ pa_assert(r);
+
+ return (((out_length / r->o_fz)*r->i_ss.rate)/r->o_ss.rate) * r->i_fz;
+}
+
+size_t pa_resampler_max_block_size(pa_resampler *r) {
+ size_t block_size_max;
+ pa_sample_spec ss;
+ size_t fs;
+
+ pa_assert(r);
+
+ block_size_max = pa_mempool_block_size_max(r->mempool);
+
+ /* We deduce the "largest" sample spec we're using during the
+ * conversion */
+ ss = r->i_ss;
+ if (r->o_ss.channels > ss.channels)
+ ss.channels = r->o_ss.channels;
+
+ /* We silently assume that the format enum is ordered by size */
+ if (r->o_ss.format > ss.format)
+ ss.format = r->o_ss.format;
+ if (r->work_format > ss.format)
+ ss.format = r->work_format;
+
+ if (r->o_ss.rate > ss.rate)
+ ss.rate = r->o_ss.rate;
+
+ fs = pa_frame_size(&ss);
+
+ return (((block_size_max/fs + EXTRA_SAMPLES)*r->i_ss.rate)/ss.rate)*r->i_fz;
+}
+
+void pa_resampler_reset(pa_resampler *r) {
+ pa_assert(r);
+
+ if (r->impl_reset)
+ r->impl_reset(r);
+}
+
+pa_resample_method_t pa_resampler_get_method(pa_resampler *r) {
+ pa_assert(r);
+
+ return r->method;
+}
+
+static const char * const resample_methods[] = {
+ "src-sinc-best-quality",
+ "src-sinc-medium-quality",
+ "src-sinc-fastest",
+ "src-zero-order-hold",
+ "src-linear",
+ "trivial",
+ "speex-float-0",
+ "speex-float-1",
+ "speex-float-2",
+ "speex-float-3",
+ "speex-float-4",
+ "speex-float-5",
+ "speex-float-6",
+ "speex-float-7",
+ "speex-float-8",
+ "speex-float-9",
+ "speex-float-10",
+ "speex-fixed-0",
+ "speex-fixed-1",
+ "speex-fixed-2",
+ "speex-fixed-3",
+ "speex-fixed-4",
+ "speex-fixed-5",
+ "speex-fixed-6",
+ "speex-fixed-7",
+ "speex-fixed-8",
+ "speex-fixed-9",
+ "speex-fixed-10",
+ "ffmpeg",
+ "auto",
+ "copy"
+};
+
+const char *pa_resample_method_to_string(pa_resample_method_t m) {
+
+ if (m < 0 || m >= PA_RESAMPLER_MAX)
+ return NULL;
+
+ return resample_methods[m];
+}
+
+int pa_resample_method_supported(pa_resample_method_t m) {
+
+ if (m < 0 || m >= PA_RESAMPLER_MAX)
+ return 0;
+
+#ifndef HAVE_LIBSAMPLERATE
+ if (m <= PA_RESAMPLER_SRC_LINEAR)
+ return 0;
+#endif
+
+ return 1;
+}
+
+pa_resample_method_t pa_parse_resample_method(const char *string) {
+ pa_resample_method_t m;
+
+ pa_assert(string);
+
+ for (m = 0; m < PA_RESAMPLER_MAX; m++)
+ if (!strcmp(string, resample_methods[m]))
+ return m;
+
+ if (!strcmp(string, "speex-fixed"))
+ return PA_RESAMPLER_SPEEX_FIXED_BASE + 3;
+
+ if (!strcmp(string, "speex-float"))
+ return PA_RESAMPLER_SPEEX_FLOAT_BASE + 3;
+
+ return PA_RESAMPLER_INVALID;
+}
+
+static pa_bool_t on_left(pa_channel_position_t p) {
+
+ return
+ p == PA_CHANNEL_POSITION_FRONT_LEFT ||
+ p == PA_CHANNEL_POSITION_REAR_LEFT ||
+ p == PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER ||
+ p == PA_CHANNEL_POSITION_SIDE_LEFT ||
+ p == PA_CHANNEL_POSITION_TOP_FRONT_LEFT ||
+ p == PA_CHANNEL_POSITION_TOP_REAR_LEFT;
+}
+
+static pa_bool_t on_right(pa_channel_position_t p) {
+
+ return
+ p == PA_CHANNEL_POSITION_FRONT_RIGHT ||
+ p == PA_CHANNEL_POSITION_REAR_RIGHT ||
+ p == PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER ||
+ p == PA_CHANNEL_POSITION_SIDE_RIGHT ||
+ p == PA_CHANNEL_POSITION_TOP_FRONT_RIGHT ||
+ p == PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
+}
+
+static pa_bool_t on_center(pa_channel_position_t p) {
+
+ return
+ p == PA_CHANNEL_POSITION_FRONT_CENTER ||
+ p == PA_CHANNEL_POSITION_REAR_CENTER ||
+ p == PA_CHANNEL_POSITION_TOP_CENTER ||
+ p == PA_CHANNEL_POSITION_TOP_FRONT_CENTER ||
+ p == PA_CHANNEL_POSITION_TOP_REAR_CENTER;
+}
+
+static pa_bool_t on_lfe(pa_channel_position_t p) {
+ return
+ p == PA_CHANNEL_POSITION_LFE;
+}
+
+static void calc_map_table(pa_resampler *r) {
+ unsigned oc, ic;
+ pa_bool_t ic_connected[PA_CHANNELS_MAX];
+ pa_bool_t remix;
+ pa_strbuf *s;
+ char *t;
+
+ pa_assert(r);
+
+ 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)))))
+ return;
+
+ memset(r->map_table, 0, sizeof(r->map_table));
+ memset(ic_connected, 0, sizeof(ic_connected));
+ remix = (r->flags & (PA_RESAMPLER_NO_REMAP|PA_RESAMPLER_NO_REMIX)) == 0;
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+ pa_bool_t oc_connected = FALSE;
+ pa_channel_position_t b = r->o_cm.map[oc];
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+ pa_channel_position_t a = r->i_cm.map[ic];
+
+ if (r->flags & PA_RESAMPLER_NO_REMAP) {
+ /* We shall not do any remapping. Hence, just check by index */
+
+ if (ic == oc)
+ r->map_table[oc][ic] = 1.0;
+
+ continue;
+ }
+
+ if (r->flags & PA_RESAMPLER_NO_REMIX) {
+ /* We shall not do any remixing. Hence, just check by name */
+
+ if (a == b)
+ r->map_table[oc][ic] = 1.0;
+
+ continue;
+ }
+
+ pa_assert(remix);
+
+ /* OK, we shall do the full monty: upmixing and
+ * downmixing. Our algorithm is relatively simple, does
+ * not do spacialization, delay elements or apply lowpass
+ * filters for LFE. Patches are always welcome,
+ * though. Oh, and it doesn't do any matrix
+ * decoding. (Which probably wouldn't make any sense
+ * anyway.)
+ *
+ * This code is not idempotent: downmixing an upmixed
+ * stereo stream is not identical to the original. The
+ * volume will not match, and the two channels will be a
+ * linear combination of both.
+ *
+ * This is losely based on random suggestions found on the
+ * Internet, such as this:
+ * http://www.halfgaar.net/surround-sound-in-linux and the
+ * alsa upmix plugin.
+ *
+ * The algorithm works basically like this:
+ *
+ * 1) Connect all channels with matching names.
+ *
+ * 2) Mono Handling:
+ * S:Mono: Copy into all D:channels
+ * D:Mono: Copy in all S:channels
+ *
+ * 3) Mix D:Left, D:Right:
+ * D:Left: If not connected, avg all S:Left
+ * D:Right: If not connected, avg all S:Right
+ *
+ * 4) Mix D:Center
+ * If not connected, avg all S:Center
+ * If still not connected, avg all S:Left, S:Right
+ *
+ * 5) Mix D:LFE
+ * If not connected, avg all S:*
+ *
+ * 6) Make sure S:Left/S:Right is used: S:Left/S:Right: If
+ * not connected, mix into all D:left and all D:right
+ * channels. Gain is 0.1, the current left and right
+ * should be multiplied by 0.9.
+ *
+ * 7) Make sure S:Center, S:LFE is used:
+ *
+ * S:Center, S:LFE: If not connected, mix into all
+ * D:left, all D:right, all D:center channels, gain is
+ * 0.375. The current (as result of 1..6) factors
+ * should be multiplied by 0.75. (Alt. suggestion: 0.25
+ * vs. 0.5)
+ *
+ * S: and D: shall relate to the source resp. destination channels.
+ *
+ * Rationale: 1, 2 are probably obvious. For 3: this
+ * copies front to rear if needed. For 4: we try to find
+ * some suitable C source for C, if we don't find any, we
+ * avg L and R. For 5: LFE is mixed from all channels. For
+ * 6: the rear channels should not be dropped entirely,
+ * however have only minimal impact. For 7: movies usually
+ * encode speech on the center channel. Thus we have to
+ * make sure this channel is distributed to L and R if not
+ * available in the output. Also, LFE is used to achieve a
+ * greater dynamic range, and thus we should try to do our
+ * best to pass it to L+R.
+ */
+
+ if (a == b || a == PA_CHANNEL_POSITION_MONO || b == PA_CHANNEL_POSITION_MONO) {
+ r->map_table[oc][ic] = 1.0;
+
+ oc_connected = TRUE;
+ ic_connected[ic] = TRUE;
+ }
+ }
+
+ if (!oc_connected && remix) {
+ /* OK, we shall remix */
+
+ if (on_left(b)) {
+ unsigned n = 0;
+
+ /* We are not connected and on the left side, let's
+ * average all left side input channels. */
+
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_left(r->i_cm.map[ic]))
+ n++;
+
+ if (n > 0)
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_left(r->i_cm.map[ic])) {
+ r->map_table[oc][ic] = 1.0 / n;
+ ic_connected[ic] = TRUE;
+ }
+
+ /* We ignore the case where there is no left input
+ * channel. Something is really wrong in this case
+ * anyway. */
+
+ } else if (on_right(b)) {
+ unsigned n = 0;
+
+ /* We are not connected and on the right side, let's
+ * average all right side input channels. */
+
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_right(r->i_cm.map[ic]))
+ n++;
+
+ if (n > 0)
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_right(r->i_cm.map[ic])) {
+ r->map_table[oc][ic] = 1.0 / n;
+ ic_connected[ic] = TRUE;
+ }
+
+ /* We ignore the case where there is no right input
+ * channel. Something is really wrong in this case
+ * anyway. */
+
+ } else if (on_center(b)) {
+ unsigned n = 0;
+
+ /* We are not connected and at the center. Let's
+ * average all center input channels. */
+
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_center(r->i_cm.map[ic]))
+ n++;
+
+ if (n > 0) {
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_center(r->i_cm.map[ic])) {
+ r->map_table[oc][ic] = 1.0 / n;
+ ic_connected[ic] = TRUE;
+ }
+ } else {
+
+ /* Hmm, no center channel around, let's synthesize
+ * it by mixing L and R.*/
+
+ n = 0;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_left(r->i_cm.map[ic]) || on_right(r->i_cm.map[ic]))
+ n++;
+
+ if (n > 0)
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ if (on_left(r->i_cm.map[ic]) || on_right(r->i_cm.map[ic])) {
+ r->map_table[oc][ic] = 1.0 / n;
+ ic_connected[ic] = TRUE;
+ }
+
+ /* We ignore the case where there is not even a
+ * left or right input channel. Something is
+ * really wrong in this case anyway. */
+ }
+
+ } else if (on_lfe(b)) {
+
+ /* We are not connected and an LFE. Let's average all
+ * channels for LFE. */
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+ r->map_table[oc][ic] = 1.0 / r->i_ss.channels;
+
+ /* Please note that a channel connected to LFE
+ * doesn't really count as connected. */
+ }
+ }
+ }
+ }
+
+ if (remix) {
+ unsigned
+ ic_unconnected_left = 0,
+ ic_unconnected_right = 0,
+ ic_unconnected_center = 0,
+ ic_unconnected_lfe = 0;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+ pa_channel_position_t a = r->i_cm.map[ic];
+
+ if (ic_connected[ic])
+ continue;
+
+ if (on_left(a))
+ ic_unconnected_left++;
+ else if (on_right(a))
+ ic_unconnected_right++;
+ else if (on_center(a))
+ ic_unconnected_center++;
+ else if (on_lfe(a))
+ ic_unconnected_lfe++;
+ }
+
+ if (ic_unconnected_left > 0) {
+
+ /* OK, so there are unconnected input channels on the
+ * left. Let's multiply all already connected channels on
+ * the left side by .9 and add in our averaged unconnected
+ * channels multplied by .1 */
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+
+ if (!on_left(r->o_cm.map[oc]))
+ continue;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+
+ if (ic_connected[ic]) {
+ r->map_table[oc][ic] *= .9;
+ continue;
+ }
+
+ if (on_left(r->i_cm.map[ic]))
+ r->map_table[oc][ic] = .1 / ic_unconnected_left;
+ }
+ }
+ }
+
+ if (ic_unconnected_right > 0) {
+
+ /* OK, so there are unconnected input channels on the
+ * right. Let's multiply all already connected channels on
+ * the right side by .9 and add in our averaged unconnected
+ * channels multplied by .1 */
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+
+ if (!on_right(r->o_cm.map[oc]))
+ continue;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+
+ if (ic_connected[ic]) {
+ r->map_table[oc][ic] *= .9;
+ continue;
+ }
+
+ if (on_right(r->i_cm.map[ic]))
+ r->map_table[oc][ic] = .1 / ic_unconnected_right;
+ }
+ }
+ }
+
+ if (ic_unconnected_center > 0) {
+ pa_bool_t mixed_in = FALSE;
+
+ /* OK, so there are unconnected input channels on the
+ * center. Let's multiply all already connected channels on
+ * the center side by .9 and add in our averaged unconnected
+ * channels multplied by .1 */
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+
+ if (!on_center(r->o_cm.map[oc]))
+ continue;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+
+ if (ic_connected[ic]) {
+ r->map_table[oc][ic] *= .9;
+ continue;
+ }
+
+ if (on_center(r->i_cm.map[ic])) {
+ r->map_table[oc][ic] = .1 / ic_unconnected_center;
+ mixed_in = TRUE;
+ }
+ }
+ }
+
+ if (!mixed_in) {
+
+ /* Hmm, as it appears there was no center channel we
+ could mix our center channel in. In this case, mix
+ it into left and right. Using .375 and 0.75 as
+ factors. */
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+
+ if (!on_left(r->o_cm.map[oc]) && !on_right(r->o_cm.map[oc]))
+ continue;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+
+ if (ic_connected[ic]) {
+ r->map_table[oc][ic] *= .75;
+ continue;
+ }
+
+ if (on_center(r->i_cm.map[ic]))
+ r->map_table[oc][ic] = .375 / ic_unconnected_center;
+ }
+ }
+ }
+ }
+
+ if (ic_unconnected_lfe > 0) {
+
+ /* OK, so there is an unconnected LFE channel. Let's mix
+ * it into all channels, with factor 0.375 */
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+
+ if (!on_lfe(r->i_cm.map[ic]))
+ continue;
+
+ for (oc = 0; oc < r->o_ss.channels; oc++)
+ r->map_table[oc][ic] = 0.375 / ic_unconnected_lfe;
+ }
+ }
+ }
+
+
+ s = pa_strbuf_new();
+
+ pa_strbuf_printf(s, " ");
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ pa_strbuf_printf(s, " I%02u ", ic);
+ pa_strbuf_puts(s, "\n +");
+
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ pa_strbuf_printf(s, "------");
+ pa_strbuf_puts(s, "\n");
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+ pa_strbuf_printf(s, "O%02u |", oc);
+
+ for (ic = 0; ic < r->i_ss.channels; ic++)
+ pa_strbuf_printf(s, " %1.3f", r->map_table[oc][ic]);
+
+ pa_strbuf_puts(s, "\n");
+ }
+
+ pa_log_debug("Channel matrix:\n%s", t = pa_strbuf_tostring_free(s));
+ pa_xfree(t);
+}
+
+static pa_memchunk* convert_to_work_format(pa_resampler *r, pa_memchunk *input) {
+ unsigned n_samples;
+ void *src, *dst;
+
+ pa_assert(r);
+ pa_assert(input);
+ pa_assert(input->memblock);
+
+ /* Convert the incoming sample into the work sample format and place them in buf1 */
+
+ if (!r->to_work_format_func || !input->length)
+ return input;
+
+ n_samples = (input->length / r->i_fz) * r->i_ss.channels;
+
+ r->buf1.index = 0;
+ r->buf1.length = r->w_sz * n_samples;
+
+ if (!r->buf1.memblock || r->buf1_samples < n_samples) {
+ if (r->buf1.memblock)
+ pa_memblock_unref(r->buf1.memblock);
+
+ r->buf1_samples = n_samples;
+ r->buf1.memblock = pa_memblock_new(r->mempool, r->buf1.length);
+ }
+
+ src = (uint8_t*) pa_memblock_acquire(input->memblock) + input->index;
+ dst = (uint8_t*) pa_memblock_acquire(r->buf1.memblock);
+
+ r->to_work_format_func(n_samples, src, dst);
+
+ pa_memblock_release(input->memblock);
+ pa_memblock_release(r->buf1.memblock);
+
+ return &r->buf1;
+}
+
+static void vectoradd_s16_with_fraction(
+ int16_t *d, int dstr,
+ const int16_t *s1, int sstr1,
+ const int16_t *s2, int sstr2,
+ int n,
+ float s3, float s4) {
+
+ int32_t i3, i4;
+
+ i3 = (int32_t) (s3 * 0x10000);
+ i4 = (int32_t) (s4 * 0x10000);
+
+ for (; n > 0; n--) {
+ int32_t a, b;
+
+ a = *s1;
+ b = *s2;
+
+ a = (a * i3) / 0x10000;
+ b = (b * i4) / 0x10000;
+
+ *d = (int16_t) (a + b);
+
+ s1 = (const int16_t*) ((const uint8_t*) s1 + sstr1);
+ s2 = (const int16_t*) ((const uint8_t*) s2 + sstr2);
+ d = (int16_t*) ((uint8_t*) d + dstr);
+
+ }
+}
+
+static pa_memchunk *remap_channels(pa_resampler *r, pa_memchunk *input) {
+ unsigned in_n_samples, out_n_samples, n_frames;
+ int i_skip, o_skip;
+ unsigned oc;
+ void *src, *dst;
+
+ pa_assert(r);
+ pa_assert(input);
+ pa_assert(input->memblock);
+
+ /* Remap channels and place the result int buf2 */
+
+ if (!r->map_required || !input->length)
+ return input;
+
+ in_n_samples = input->length / r->w_sz;
+ n_frames = in_n_samples / r->i_ss.channels;
+ out_n_samples = n_frames * r->o_ss.channels;
+
+ r->buf2.index = 0;
+ r->buf2.length = r->w_sz * out_n_samples;
+
+ if (!r->buf2.memblock || r->buf2_samples < out_n_samples) {
+ if (r->buf2.memblock)
+ pa_memblock_unref(r->buf2.memblock);
+
+ r->buf2_samples = out_n_samples;
+ r->buf2.memblock = pa_memblock_new(r->mempool, r->buf2.length);
+ }
+
+ src = ((uint8_t*) pa_memblock_acquire(input->memblock) + input->index);
+ dst = pa_memblock_acquire(r->buf2.memblock);
+
+ memset(dst, 0, r->buf2.length);
+
+ o_skip = r->w_sz * r->o_ss.channels;
+ i_skip = r->w_sz * r->i_ss.channels;
+
+ switch (r->work_format) {
+ case PA_SAMPLE_FLOAT32NE:
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+ unsigned ic;
+ static const float one = 1.0;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+
+ if (r->map_table[oc][ic] <= 0.0)
+ continue;
+
+ oil_vectoradd_f32(
+ (float*) dst + oc, o_skip,
+ (float*) dst + oc, o_skip,
+ (float*) src + ic, i_skip,
+ n_frames,
+ &one, &r->map_table[oc][ic]);
+ }
+ }
+
+ break;
+
+ case PA_SAMPLE_S16NE:
+
+ for (oc = 0; oc < r->o_ss.channels; oc++) {
+ unsigned ic;
+
+ for (ic = 0; ic < r->i_ss.channels; ic++) {
+
+ if (r->map_table[oc][ic] <= 0.0)
+ continue;
+
+ if (r->map_table[oc][ic] >= 1.0) {
+ static const int16_t one = 1;
+
+ oil_vectoradd_s16(
+ (int16_t*) dst + oc, o_skip,
+ (int16_t*) dst + oc, o_skip,
+ (int16_t*) src + ic, i_skip,
+ n_frames,
+ &one, &one);
+
+ } else
+
+ vectoradd_s16_with_fraction(
+ (int16_t*) dst + oc, o_skip,
+ (int16_t*) dst + oc, o_skip,
+ (int16_t*) src + ic, i_skip,
+ n_frames,
+ 1.0, r->map_table[oc][ic]);
+ }
+ }
+
+ break;
+
+ default:
+ pa_assert_not_reached();
+ }
+
+ pa_memblock_release(input->memblock);
+ pa_memblock_release(r->buf2.memblock);
+
+ r->buf2.length = out_n_samples * r->w_sz;
+
+ return &r->buf2;
+}
+
+static pa_memchunk *resample(pa_resampler *r, pa_memchunk *input) {
+ unsigned in_n_frames, in_n_samples;
+ unsigned out_n_frames, out_n_samples;
+
+ pa_assert(r);
+ pa_assert(input);
+
+ /* Resample the data and place the result in buf3 */
+
+ if (!r->impl_resample || !input->length)
+ return input;
+
+ in_n_samples = input->length / r->w_sz;
+ in_n_frames = in_n_samples / r->o_ss.channels;
+
+ out_n_frames = ((in_n_frames*r->o_ss.rate)/r->i_ss.rate)+EXTRA_SAMPLES;
+ out_n_samples = out_n_frames * r->o_ss.channels;
+
+ r->buf3.index = 0;
+ r->buf3.length = r->w_sz * out_n_samples;
+
+ if (!r->buf3.memblock || r->buf3_samples < out_n_samples) {
+ if (r->buf3.memblock)
+ pa_memblock_unref(r->buf3.memblock);
+
+ r->buf3_samples = out_n_samples;
+ r->buf3.memblock = pa_memblock_new(r->mempool, r->buf3.length);
+ }
+
+ r->impl_resample(r, input, in_n_frames, &r->buf3, &out_n_frames);
+ r->buf3.length = out_n_frames * r->w_sz * r->o_ss.channels;
+
+ return &r->buf3;
+}
+
+static pa_memchunk *convert_from_work_format(pa_resampler *r, pa_memchunk *input) {
+ unsigned n_samples, n_frames;
+ void *src, *dst;
+
+ pa_assert(r);
+ pa_assert(input);
+
+ /* Convert the data into the correct sample type and place the result in buf4 */
+
+ if (!r->from_work_format_func || !input->length)
+ return input;
+
+ n_samples = input->length / r->w_sz;
+ n_frames = n_samples / r->o_ss.channels;
+
+ r->buf4.index = 0;
+ r->buf4.length = r->o_fz * n_frames;
+
+ if (!r->buf4.memblock || r->buf4_samples < n_samples) {
+ if (r->buf4.memblock)
+ pa_memblock_unref(r->buf4.memblock);
+
+ r->buf4_samples = n_samples;
+ r->buf4.memblock = pa_memblock_new(r->mempool, r->buf4.length);
+ }
+
+ src = (uint8_t*) pa_memblock_acquire(input->memblock) + input->index;
+ dst = pa_memblock_acquire(r->buf4.memblock);
+ r->from_work_format_func(n_samples, src, dst);
+ pa_memblock_release(input->memblock);
+ pa_memblock_release(r->buf4.memblock);
+
+ r->buf4.length = r->o_fz * n_frames;
+
+ return &r->buf4;
+}
+
+void pa_resampler_run(pa_resampler *r, const pa_memchunk *in, pa_memchunk *out) {
+ pa_memchunk *buf;
+
+ pa_assert(r);
+ pa_assert(in);
+ pa_assert(out);
+ pa_assert(in->length);
+ pa_assert(in->memblock);
+ pa_assert(in->length % r->i_fz == 0);
+
+ buf = (pa_memchunk*) in;
+ buf = convert_to_work_format(r, buf);
+ buf = remap_channels(r, buf);
+ buf = resample(r, buf);
+
+ if (buf->length) {
+ buf = convert_from_work_format(r, buf);
+ *out = *buf;
+
+ if (buf == in)
+ pa_memblock_ref(buf->memblock);
+ else
+ pa_memchunk_reset(buf);
+ } else
+ pa_memchunk_reset(out);
+}
+
+/*** libsamplerate based implementation ***/
+
+#ifdef HAVE_LIBSAMPLERATE
+static void libsamplerate_resample(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
+ SRC_DATA data;
+
+ pa_assert(r);
+ pa_assert(input);
+ pa_assert(output);
+ pa_assert(out_n_frames);
+
+ memset(&data, 0, sizeof(data));
+
+ data.data_in = (float*) ((uint8_t*) pa_memblock_acquire(input->memblock) + input->index);
+ data.input_frames = in_n_frames;
+
+ data.data_out = (float*) ((uint8_t*) pa_memblock_acquire(output->memblock) + output->index);
+ data.output_frames = *out_n_frames;
+
+ data.src_ratio = (double) r->o_ss.rate / r->i_ss.rate;
+ data.end_of_input = 0;
+
+ pa_assert_se(src_process(r->src.state, &data) == 0);
+ pa_assert((unsigned) data.input_frames_used == in_n_frames);
+
+ pa_memblock_release(input->memblock);
+ pa_memblock_release(output->memblock);
+
+ *out_n_frames = data.output_frames_gen;
+}
+
+static void libsamplerate_update_rates(pa_resampler *r) {
+ pa_assert(r);
+
+ pa_assert_se(src_set_ratio(r->src.state, (double) r->o_ss.rate / r->i_ss.rate) == 0);
+}
+
+static void libsamplerate_reset(pa_resampler *r) {
+ pa_assert(r);
+
+ pa_assert_se(src_reset(r->src.state) == 0);
+}
+
+static void libsamplerate_free(pa_resampler *r) {
+ pa_assert(r);
+
+ if (r->src.state)
+ src_delete(r->src.state);
+}
+
+static int libsamplerate_init(pa_resampler *r) {
+ int err;
+
+ pa_assert(r);
+
+ if (!(r->src.state = src_new(r->method, r->o_ss.channels, &err)))
+ return -1;
+
+ r->impl_free = libsamplerate_free;
+ r->impl_update_rates = libsamplerate_update_rates;
+ r->impl_resample = libsamplerate_resample;
+ r->impl_reset = libsamplerate_reset;
+
+ return 0;
+}
+#endif
+
+/*** speex based implementation ***/
+
+static void speex_resample_float(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
+ float *in, *out;
+ uint32_t inf = in_n_frames, outf = *out_n_frames;
+
+ pa_assert(r);
+ pa_assert(input);
+ pa_assert(output);
+ pa_assert(out_n_frames);
+
+ in = (float*) ((uint8_t*) pa_memblock_acquire(input->memblock) + input->index);
+ out = (float*) ((uint8_t*) pa_memblock_acquire(output->memblock) + output->index);
+
+ pa_assert_se(paspfl_resampler_process_interleaved_float(r->speex.state, in, &inf, out, &outf) == 0);
+
+ pa_memblock_release(input->memblock);
+ pa_memblock_release(output->memblock);
+
+ pa_assert(inf == in_n_frames);
+ *out_n_frames = outf;
+}
+
+static void speex_resample_int(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
+ int16_t *in, *out;
+ uint32_t inf = in_n_frames, outf = *out_n_frames;
+
+ pa_assert(r);
+ pa_assert(input);
+ pa_assert(output);
+ pa_assert(out_n_frames);
+
+ in = (int16_t*) ((uint8_t*) pa_memblock_acquire(input->memblock) + input->index);
+ out = (int16_t*) ((uint8_t*) pa_memblock_acquire(output->memblock) + output->index);
+
+ pa_assert_se(paspfx_resampler_process_interleaved_int(r->speex.state, in, &inf, out, &outf) == 0);
+
+ pa_memblock_release(input->memblock);
+ pa_memblock_release(output->memblock);
+
+ pa_assert(inf == in_n_frames);
+ *out_n_frames = outf;
+}
+
+static void speex_update_rates(pa_resampler *r) {
+ pa_assert(r);
+
+ if (r->method >= PA_RESAMPLER_SPEEX_FIXED_BASE && r->method <= PA_RESAMPLER_SPEEX_FIXED_MAX)
+ pa_assert_se(paspfx_resampler_set_rate(r->speex.state, r->i_ss.rate, r->o_ss.rate) == 0);
+ else {
+ pa_assert(r->method >= PA_RESAMPLER_SPEEX_FLOAT_BASE && r->method <= PA_RESAMPLER_SPEEX_FLOAT_MAX);
+ pa_assert_se(paspfl_resampler_set_rate(r->speex.state, r->i_ss.rate, r->o_ss.rate) == 0);
+ }
+}
+
+static void speex_reset(pa_resampler *r) {
+ pa_assert(r);
+
+ if (r->method >= PA_RESAMPLER_SPEEX_FIXED_BASE && r->method <= PA_RESAMPLER_SPEEX_FIXED_MAX)
+ pa_assert_se(paspfx_resampler_reset_mem(r->speex.state) == 0);
+ else {
+ pa_assert(r->method >= PA_RESAMPLER_SPEEX_FLOAT_BASE && r->method <= PA_RESAMPLER_SPEEX_FLOAT_MAX);
+ pa_assert_se(paspfl_resampler_reset_mem(r->speex.state) == 0);
+ }
+}
+
+static void speex_free(pa_resampler *r) {
+ pa_assert(r);
+
+ if (!r->speex.state)
+ return;
+
+ if (r->method >= PA_RESAMPLER_SPEEX_FIXED_BASE && r->method <= PA_RESAMPLER_SPEEX_FIXED_MAX)
+ paspfx_resampler_destroy(r->speex.state);
+ else {
+ pa_assert(r->method >= PA_RESAMPLER_SPEEX_FLOAT_BASE && r->method <= PA_RESAMPLER_SPEEX_FLOAT_MAX);
+ paspfl_resampler_destroy(r->speex.state);
+ }
+}
+
+static int speex_init(pa_resampler *r) {
+ int q, err;
+
+ pa_assert(r);
+
+ r->impl_free = speex_free;
+ r->impl_update_rates = speex_update_rates;
+ r->impl_reset = speex_reset;
+
+ if (r->method >= PA_RESAMPLER_SPEEX_FIXED_BASE && r->method <= PA_RESAMPLER_SPEEX_FIXED_MAX) {
+ q = r->method - PA_RESAMPLER_SPEEX_FIXED_BASE;
+
+ pa_log_info("Choosing speex quality setting %i.", q);
+
+ if (!(r->speex.state = paspfx_resampler_init(r->o_ss.channels, r->i_ss.rate, r->o_ss.rate, q, &err)))
+ return -1;
+
+ r->impl_resample = speex_resample_int;
+ } else {
+ pa_assert(r->method >= PA_RESAMPLER_SPEEX_FLOAT_BASE && r->method <= PA_RESAMPLER_SPEEX_FLOAT_MAX);
+ q = r->method - PA_RESAMPLER_SPEEX_FLOAT_BASE;
+
+ pa_log_info("Choosing speex quality setting %i.", q);
+
+ if (!(r->speex.state = paspfl_resampler_init(r->o_ss.channels, r->i_ss.rate, r->o_ss.rate, q, &err)))
+ return -1;
+
+ r->impl_resample = speex_resample_float;
+ }
+
+ return 0;
+}
+
+/* Trivial implementation */
+
+static void trivial_resample(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
+ size_t fz;
+ unsigned o_index;
+ void *src, *dst;
+
+ pa_assert(r);
+ pa_assert(input);
+ pa_assert(output);
+ pa_assert(out_n_frames);
+
+ fz = r->w_sz * r->o_ss.channels;
+
+ src = (uint8_t*) pa_memblock_acquire(input->memblock) + input->index;
+ dst = (uint8_t*) pa_memblock_acquire(output->memblock) + output->index;
+
+ for (o_index = 0;; o_index++, r->trivial.o_counter++) {
+ unsigned j;
+
+ j = ((r->trivial.o_counter * r->i_ss.rate) / r->o_ss.rate);
+ j = j > r->trivial.i_counter ? j - r->trivial.i_counter : 0;
+
+ if (j >= in_n_frames)
+ break;
+
+ pa_assert(o_index * fz < pa_memblock_get_length(output->memblock));
+
+ oil_memcpy((uint8_t*) dst + fz * o_index,
+ (uint8_t*) src + fz * j, fz);
+ }
+
+ pa_memblock_release(input->memblock);
+ pa_memblock_release(output->memblock);
+
+ *out_n_frames = o_index;
+
+ r->trivial.i_counter += in_n_frames;
+
+ /* Normalize counters */
+ while (r->trivial.i_counter >= r->i_ss.rate) {
+ pa_assert(r->trivial.o_counter >= r->o_ss.rate);
+
+ r->trivial.i_counter -= r->i_ss.rate;
+ r->trivial.o_counter -= r->o_ss.rate;
+ }
+}
+
+static void trivial_update_rates_or_reset(pa_resampler *r) {
+ pa_assert(r);
+
+ r->trivial.i_counter = 0;
+ r->trivial.o_counter = 0;
+}
+
+static int trivial_init(pa_resampler*r) {
+ pa_assert(r);
+
+ r->trivial.o_counter = r->trivial.i_counter = 0;
+
+ r->impl_resample = trivial_resample;
+ r->impl_update_rates = trivial_update_rates_or_reset;
+ r->impl_reset = trivial_update_rates_or_reset;
+
+ return 0;
+}
+
+/*** ffmpeg based implementation ***/
+
+static void ffmpeg_resample(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
+ unsigned used_frames = 0, c;
+
+ pa_assert(r);
+ pa_assert(input);
+ pa_assert(output);
+ pa_assert(out_n_frames);
+
+ for (c = 0; c < r->o_ss.channels; c++) {
+ unsigned u;
+ pa_memblock *b, *w;
+ int16_t *p, *t, *k, *q, *s;
+ int consumed_frames;
+ unsigned in, l;
+
+ /* Allocate a new block */
+ b = pa_memblock_new(r->mempool, r->ffmpeg.buf[c].length + in_n_frames * sizeof(int16_t));
+ p = pa_memblock_acquire(b);
+
+ /* Copy the remaining data into it */
+ l = r->ffmpeg.buf[c].length;
+ if (r->ffmpeg.buf[c].memblock) {
+ t = (int16_t*) ((uint8_t*) pa_memblock_acquire(r->ffmpeg.buf[c].memblock) + r->ffmpeg.buf[c].index);
+ memcpy(p, t, l);
+ pa_memblock_release(r->ffmpeg.buf[c].memblock);
+ pa_memblock_unref(r->ffmpeg.buf[c].memblock);
+ pa_memchunk_reset(&r->ffmpeg.buf[c]);
+ }
+
+ /* Now append the new data, splitting up channels */
+ t = ((int16_t*) ((uint8_t*) pa_memblock_acquire(input->memblock) + input->index)) + c;
+ k = (int16_t*) ((uint8_t*) p + l);
+ for (u = 0; u < in_n_frames; u++) {
+ *k = *t;
+ t += r->o_ss.channels;
+ k ++;
+ }
+ pa_memblock_release(input->memblock);
+
+ /* Calculate the resulting number of frames */
+ in = in_n_frames + l / sizeof(int16_t);
+
+ /* Allocate buffer for the result */
+ w = pa_memblock_new(r->mempool, *out_n_frames * sizeof(int16_t));
+ q = pa_memblock_acquire(w);
+
+ /* Now, resample */
+ used_frames = av_resample(r->ffmpeg.state,
+ q, p,
+ &consumed_frames,
+ in, *out_n_frames,
+ c >= (unsigned) r->o_ss.channels-1);
+
+ pa_memblock_release(b);
+
+ /* Now store the remaining samples away */
+ pa_assert(consumed_frames <= (int) in);
+ if (consumed_frames < (int) in) {
+ r->ffmpeg.buf[c].memblock = b;
+ r->ffmpeg.buf[c].index = consumed_frames * sizeof(int16_t);
+ r->ffmpeg.buf[c].length = (in - consumed_frames) * sizeof(int16_t);
+ } else
+ pa_memblock_unref(b);
+
+ /* And place the results in the output buffer */
+ s = (short*) ((uint8_t*) pa_memblock_acquire(output->memblock) + output->index) + c;
+ for (u = 0; u < used_frames; u++) {
+ *s = *q;
+ q++;
+ s += r->o_ss.channels;
+ }
+ pa_memblock_release(output->memblock);
+ pa_memblock_release(w);
+ pa_memblock_unref(w);
+ }
+
+ *out_n_frames = used_frames;
+}
+
+static void ffmpeg_free(pa_resampler *r) {
+ unsigned c;
+
+ pa_assert(r);
+
+ if (r->ffmpeg.state)
+ av_resample_close(r->ffmpeg.state);
+
+ for (c = 0; c < PA_ELEMENTSOF(r->ffmpeg.buf); c++)
+ if (r->ffmpeg.buf[c].memblock)
+ pa_memblock_unref(r->ffmpeg.buf[c].memblock);
+}
+
+static int ffmpeg_init(pa_resampler *r) {
+ unsigned c;
+
+ pa_assert(r);
+
+ /* We could probably implement different quality levels by
+ * adjusting the filter parameters here. However, ffmpeg
+ * internally only uses these hardcoded values, so let's use them
+ * here for now as well until ffmpeg makes this configurable. */
+
+ if (!(r->ffmpeg.state = av_resample_init(r->o_ss.rate, r->i_ss.rate, 16, 10, 0, 0.8)))
+ return -1;
+
+ r->impl_free = ffmpeg_free;
+ r->impl_resample = ffmpeg_resample;
+
+ for (c = 0; c < PA_ELEMENTSOF(r->ffmpeg.buf); c++)
+ pa_memchunk_reset(&r->ffmpeg.buf[c]);
+
+ return 0;
+}
+
+/*** copy (noop) implementation ***/
+
+static int copy_init(pa_resampler *r) {
+ pa_assert(r);
+
+ pa_assert(r->o_ss.rate == r->i_ss.rate);
+
+ return 0;
+}
generated by cgit (git 2.34.1) at 2025-07-13 02:22:59 +0000