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Diffstat (limited to 'src/pulsecore/svolume_arm.c')
| -rw-r--r-- | src/pulsecore/svolume_arm.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/src/pulsecore/svolume_arm.c b/src/pulsecore/svolume_arm.c new file mode 100644 index 0000000..fdef313 --- /dev/null +++ b/src/pulsecore/svolume_arm.c @@ -0,0 +1,167 @@ +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 Lennart Poettering + Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk> + + 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 2.1 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, see <http://www.gnu.org/licenses/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <pulsecore/random.h> +#include <pulsecore/macro.h> +#include <pulsecore/endianmacros.h> + +#include "cpu-arm.h" + +#include "sample-util.h" + +#if defined (__arm__) && defined (HAVE_ARMV6) + +#define MOD_INC() \ + " subs r0, r6, %2 \n\t" \ + " itt cs \n\t" \ + " addcs r0, %1 \n\t" \ + " movcs r6, r0 \n\t" + +static pa_do_volume_func_t _volume_ref; + +static void pa_volume_s16ne_arm(int16_t *samples, const int32_t *volumes, unsigned channels, unsigned length) { + /* Channels must be at least 4, and always a multiple of the original number. + * This is also the max amount we overread the volume array, which should + * have enough padding. */ + const int32_t *ve = volumes + (channels == 3 ? 6 : PA_MAX (4U, channels)); + unsigned rem = PA_ALIGN((size_t) samples) - (size_t) samples; + + /* Make sure we're word-aligned, else performance _really_ sucks */ + if (rem) { + _volume_ref(samples, volumes, channels, rem < length ? rem : length); + + if (rem < length) { + length -= rem; + samples += rem / sizeof(*samples); + } else + return; /* we're done */ + } + + __asm__ __volatile__ ( + " mov r6, %4 \n\t" /* r6 = volumes + rem */ + " mov %3, %3, LSR #1 \n\t" /* length /= sizeof (int16_t) */ + + " cmp %3, #4 \n\t" /* check for 4+ samples */ + " blt 2f \n\t" + + /* See final case for how the multiplication works */ + + "1: \n\t" + " ldrd r2, [r6], #8 \n\t" /* 4 samples at a time */ + " ldrd r4, [r6], #8 \n\t" + " ldrd r0, [%0] \n\t" + +#ifdef WORDS_BIGENDIAN + " smulwt r2, r2, r0 \n\t" + " smulwb r3, r3, r0 \n\t" + " smulwt r4, r4, r1 \n\t" + " smulwb r5, r5, r1 \n\t" +#else + " smulwb r2, r2, r0 \n\t" + " smulwt r3, r3, r0 \n\t" + " smulwb r4, r4, r1 \n\t" + " smulwt r5, r5, r1 \n\t" +#endif + + " ssat r2, #16, r2 \n\t" + " ssat r3, #16, r3 \n\t" + " ssat r4, #16, r4 \n\t" + " ssat r5, #16, r5 \n\t" + +#ifdef WORDS_BIGENDIAN + " pkhbt r0, r3, r2, LSL #16 \n\t" + " pkhbt r1, r5, r4, LSL #16 \n\t" +#else + " pkhbt r0, r2, r3, LSL #16 \n\t" + " pkhbt r1, r4, r5, LSL #16 \n\t" +#endif + " strd r0, [%0], #8 \n\t" + + MOD_INC() + + " subs %3, %3, #4 \n\t" + " cmp %3, #4 \n\t" + " bge 1b \n\t" + + "2: \n\t" + " cmp %3, #2 \n\t" + " blt 3f \n\t" + + " ldrd r2, [r6], #8 \n\t" /* 2 samples at a time */ + " ldr r0, [%0] \n\t" + +#ifdef WORDS_BIGENDIAN + " smulwt r2, r2, r0 \n\t" + " smulwb r3, r3, r0 \n\t" +#else + " smulwb r2, r2, r0 \n\t" + " smulwt r3, r3, r0 \n\t" +#endif + + " ssat r2, #16, r2 \n\t" + " ssat r3, #16, r3 \n\t" + +#ifdef WORDS_BIGENDIAN + " pkhbt r0, r3, r2, LSL #16 \n\t" +#else + " pkhbt r0, r2, r3, LSL #16 \n\t" +#endif + " str r0, [%0], #4 \n\t" + + MOD_INC() + + " subs %3, %3, #2 \n\t" + + "3: \n\t" /* check for odd # of samples */ + " cmp %3, #1 \n\t" + " bne 4f \n\t" + + " ldr r0, [r6], #4 \n\t" /* r0 = volume */ + " ldrh r2, [%0] \n\t" /* r2 = sample */ + + " smulwb r0, r0, r2 \n\t" /* r0 = (r0 * r2) >> 16 */ + " ssat r0, #16, r0 \n\t" /* r0 = PA_CLAMP(r0, 0x7FFF) */ + + " strh r0, [%0], #2 \n\t" /* sample = r0 */ + + "4: \n\t" + + : "+r" (samples), "+r" (volumes), "+r" (ve), "+r" (length) + : "r" (volumes + ((rem / sizeof(*samples)) % channels)) + : "r6", "r5", "r4", "r3", "r2", "r1", "r0", "cc" + ); +} + +#endif /* defined (__arm__) && defined (HAVE_ARMV6) */ + +void pa_volume_func_init_arm(pa_cpu_arm_flag_t flags) { +#if defined (__arm__) && defined (HAVE_ARMV6) + pa_log_info("Initialising ARM optimized volume functions."); + + if (!_volume_ref) + _volume_ref = pa_get_volume_func(PA_SAMPLE_S16NE); + + pa_set_volume_func(PA_SAMPLE_S16NE, (pa_do_volume_func_t) pa_volume_s16ne_arm); +#endif /* defined (__arm__) && defined (HAVE_ARMV6) */ +} |