mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-06 13:29:59 -05:00
Implemented snd_pcm_rewind() for the dmix plugin
This commit is contained in:
Jaroslav Kysela
parent
8f16428f9c
commit
70b11d614d
7 changed files with 459 additions and 28 deletions
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@ -87,7 +87,7 @@ static void mix_areas_32(unsigned int size,
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register signed int sample, old_sample;
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for (;;) {
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sample = *src / 256;
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sample = *src >> 8;
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old_sample = *sum;
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if (ARCH_CMPXCHG(dst, 0, 1) == 0)
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sample -= old_sample;
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@ -159,6 +159,37 @@ static void generic_mix_areas_16_native(unsigned int size,
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}
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}
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static void generic_remix_areas_16_native(unsigned int size,
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volatile signed short *dst,
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signed short *src,
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volatile signed int *sum,
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size_t dst_step,
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size_t src_step,
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size_t sum_step)
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{
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register signed int sample;
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for (;;) {
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sample = *src;
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if (! *dst) {
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*sum = -sample;
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*dst = *src;
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} else {
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*sum = sample = *sum - sample;
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if (sample > 0x7fff)
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sample = 0x7fff;
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else if (sample < -0x8000)
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sample = -0x8000;
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*dst = sample;
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}
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if (!--size)
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return;
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src = (signed short *) ((char *)src + src_step);
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dst = (signed short *) ((char *)dst + dst_step);
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sum = (signed int *) ((char *)sum + sum_step);
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}
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}
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static void generic_mix_areas_32_native(unsigned int size,
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volatile signed int *dst,
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signed int *src,
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@ -170,7 +201,7 @@ static void generic_mix_areas_32_native(unsigned int size,
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register signed int sample;
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for (;;) {
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sample = *src / 256;
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sample = *src >> 8;
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if (! *dst) {
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*sum = sample;
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*dst = *src;
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@ -193,6 +224,39 @@ static void generic_mix_areas_32_native(unsigned int size,
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}
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}
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static void generic_remix_areas_32_native(unsigned int size,
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volatile signed int *dst,
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signed int *src,
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volatile signed int *sum,
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size_t dst_step,
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size_t src_step,
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size_t sum_step)
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{
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register signed int sample;
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for (;;) {
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sample = *src >> 8;
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if (! *dst) {
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*sum = -sample;
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*dst = *src;
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} else {
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*sum = sample = *sum - sample;
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if (sample > 0x7fffff)
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sample = 0x7fffffff;
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else if (sample < -0x800000)
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sample = -0x80000000;
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else
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sample *= 256;
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*dst = sample;
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}
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if (!--size)
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return;
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src = (signed int *) ((char *)src + src_step);
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dst = (signed int *) ((char *)dst + dst_step);
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sum = (signed int *) ((char *)sum + sum_step);
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}
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}
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static void generic_mix_areas_16_swap(unsigned int size,
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volatile signed short *dst,
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signed short *src,
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@ -225,6 +289,37 @@ static void generic_mix_areas_16_swap(unsigned int size,
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}
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}
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static void generic_remix_areas_16_swap(unsigned int size,
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volatile signed short *dst,
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signed short *src,
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volatile signed int *sum,
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size_t dst_step,
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size_t src_step,
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size_t sum_step)
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{
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register signed int sample;
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for (;;) {
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sample = (signed short) bswap_16(*src);
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if (! *dst) {
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*sum = -sample;
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*dst = *src;
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} else {
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*sum = sample = *sum - sample;
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if (sample > 0x7fff)
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sample = 0x7fff;
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else if (sample < -0x8000)
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sample = -0x8000;
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*dst = (signed short) bswap_16((signed short) sample);
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}
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if (!--size)
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return;
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src = (signed short *) ((char *)src + src_step);
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dst = (signed short *) ((char *)dst + dst_step);
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sum = (signed int *) ((char *)sum + sum_step);
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}
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}
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static void generic_mix_areas_32_swap(unsigned int size,
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volatile signed int *dst,
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signed int *src,
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@ -236,7 +331,7 @@ static void generic_mix_areas_32_swap(unsigned int size,
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register signed int sample;
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for (;;) {
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sample = bswap_32(*src) / 256;
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sample = bswap_32(*src) >> 8;
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if (! *dst) {
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*sum = sample;
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*dst = *src;
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@ -259,6 +354,39 @@ static void generic_mix_areas_32_swap(unsigned int size,
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}
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}
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static void generic_remix_areas_32_swap(unsigned int size,
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volatile signed int *dst,
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signed int *src,
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volatile signed int *sum,
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size_t dst_step,
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size_t src_step,
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size_t sum_step)
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{
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register signed int sample;
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for (;;) {
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sample = bswap_32(*src) >> 8;
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if (! *dst) {
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*sum = -sample;
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*dst = *src;
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} else {
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*sum = sample = *sum - sample;
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if (sample > 0x7fffff)
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sample = 0x7fffffff;
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else if (sample < -0x800000)
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sample = -0x80000000;
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else
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sample *= 256;
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*dst = bswap_32(sample);
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}
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if (!--size)
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return;
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src = (signed int *) ((char *)src + src_step);
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dst = (signed int *) ((char *)dst + dst_step);
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sum = (signed int *) ((char *)sum + sum_step);
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}
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}
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/* always little endian */
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static void generic_mix_areas_24(unsigned int size,
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volatile unsigned char *dst,
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@ -293,6 +421,38 @@ static void generic_mix_areas_24(unsigned int size,
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}
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}
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static void generic_remix_areas_24(unsigned int size,
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volatile unsigned char *dst,
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unsigned char *src,
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volatile signed int *sum,
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size_t dst_step,
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size_t src_step,
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size_t sum_step)
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{
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register signed int sample;
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for (;;) {
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sample = src[0] | (src[1] << 8) | (((signed char *)src)[2] << 16);
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if (!(dst[0] | dst[1] | dst[2])) {
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*sum = -sample;
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} else {
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*sum = sample = *sum - sample;
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if (sample > 0x7fffff)
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sample = 0x7fffff;
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else if (sample < -0x800000)
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sample = -0x800000;
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}
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dst[0] = sample;
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dst[1] = sample >> 8;
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dst[2] = sample >> 16;
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if (!--size)
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return;
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dst += dst_step;
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src += src_step;
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sum = (signed int *) ((char *)sum + sum_step);
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}
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}
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static void generic_mix_areas_u8(unsigned int size,
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volatile unsigned char *dst,
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unsigned char *src,
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@ -322,18 +482,52 @@ static void generic_mix_areas_u8(unsigned int size,
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}
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}
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static void generic_remix_areas_u8(unsigned int size,
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volatile unsigned char *dst,
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unsigned char *src,
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volatile signed int *sum,
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size_t dst_step,
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size_t src_step,
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size_t sum_step)
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{
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for (;;) {
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register int sample = *src - 0x80;
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if (*dst == 0x80) {
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*sum = -sample;
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} else {
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*sum = sample = *sum - sample;
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if (sample > 0x7f)
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sample = 0x7f;
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else if (sample < -0x80)
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sample = -0x80;
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}
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*dst = sample + 0x80;
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if (!--size)
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return;
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dst += dst_step;
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src += src_step;
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sum = (signed int *) ((char *)sum + sum_step);
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}
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}
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static void generic_mix_select_callbacks(snd_pcm_direct_t *dmix)
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{
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if (snd_pcm_format_cpu_endian(dmix->shmptr->s.format)) {
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dmix->u.dmix.mix_areas_16 = generic_mix_areas_16_native;
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dmix->u.dmix.mix_areas_32 = generic_mix_areas_32_native;
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dmix->u.dmix.remix_areas_16 = generic_remix_areas_16_native;
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dmix->u.dmix.remix_areas_32 = generic_remix_areas_32_native;
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} else {
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dmix->u.dmix.mix_areas_16 = generic_mix_areas_16_swap;
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dmix->u.dmix.mix_areas_32 = generic_mix_areas_32_swap;
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dmix->u.dmix.remix_areas_16 = generic_remix_areas_16_swap;
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dmix->u.dmix.remix_areas_32 = generic_remix_areas_32_swap;
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}
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dmix->u.dmix.mix_areas_24 = generic_mix_areas_24;
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dmix->u.dmix.mix_areas_u8 = generic_mix_areas_u8;
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dmix->u.dmix.remix_areas_24 = generic_remix_areas_24;
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dmix->u.dmix.remix_areas_u8 = generic_remix_areas_u8;
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}
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#endif
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