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https://github.com/alsa-project/alsa-lib.git
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45f63a8735
Add to the dmix plugin support for the S24_3LE sample format which is used by 24-bit USB devices. The optimized assembler version uses only 23 bits for sample data so that the lowest bit can be used for synchronization because there is no 24-bit cmpxchg instruction.
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
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* optimized mixing code for x86-64
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*/
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#define MIX_AREAS1 mix_areas1
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#define MIX_AREAS2 mix_areas2
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#define MIX_AREAS3 mix_areas3
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#define LOCK_PREFIX ""
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#include "pcm_dmix_x86_64.h"
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#undef MIX_AREAS1
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#undef MIX_AREAS2
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#undef MIX_AREAS3
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#undef LOCK_PREFIX
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#define MIX_AREAS1 mix_areas1_smp
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#define MIX_AREAS2 mix_areas2_smp
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#define MIX_AREAS3 mix_areas3_smp
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#define LOCK_PREFIX "lock ; "
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#include "pcm_dmix_x86_64.h"
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#undef MIX_AREAS1
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#undef MIX_AREAS2
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#undef MIX_AREAS3
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#undef LOCK_PREFIX
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static unsigned long long dmix_supported_format =
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(1ULL << SND_PCM_FORMAT_S16_LE) |
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(1ULL << SND_PCM_FORMAT_S32_LE) |
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(1ULL << SND_PCM_FORMAT_S24_3LE);
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static void mix_select_callbacks(snd_pcm_direct_t *dmix)
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{
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FILE *in;
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char line[255];
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int smp = 0;
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/* try to determine, if we have SMP */
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in = fopen("/proc/cpuinfo", "r");
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if (in) {
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while (!feof(in)) {
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fgets(line, sizeof(line), in);
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if (!strncmp(line, "processor", 9))
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smp++;
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}
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fclose(in);
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}
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// printf("SMP: %i\n", smp);
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dmix->u.dmix.mix_areas1 = smp > 1 ? mix_areas1_smp : mix_areas1;
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dmix->u.dmix.mix_areas2 = smp > 1 ? mix_areas2_smp : mix_areas2;
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dmix->u.dmix.mix_areas3 = smp > 1 ? mix_areas3_smp : mix_areas3;
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}
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