102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
#include "audio-repack.h"
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#include <emmintrin.h>
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int check_buffer(struct audio_repack *repack, uint32_t frame_count)
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{
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const uint32_t new_size =
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frame_count * repack->base_dst_size + repack->extra_dst_size;
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if (repack->packet_size < new_size) {
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repack->packet_buffer =
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brealloc(repack->packet_buffer, new_size);
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if (!repack->packet_buffer)
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return -1;
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repack->packet_size = new_size;
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}
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return 0;
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}
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/*
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* Squash arrays.
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* For instance:
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* 2.1:
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*
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* | FL | FR | LFE | emp | emp | emp |emp |emp |
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* | | |
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* | FL | FR | LFE |
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*/
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int repack_squash(struct audio_repack *repack, const uint8_t *bsrc,
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uint32_t frame_count)
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{
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if (check_buffer(repack, frame_count) < 0)
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return -1;
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int squash = repack->extra_dst_size;
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const __m128i *src = (__m128i *)bsrc;
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const __m128i *esrc = src + frame_count;
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uint16_t *dst = (uint16_t *)repack->packet_buffer;
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/* Audio needs squashing in order to avoid resampling issues.
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* The condition checks for 7.1 audio for which no squash is needed.
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*/
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if (squash > 0) {
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while (src != esrc) {
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__m128i target = _mm_load_si128(src++);
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_mm_storeu_si128((__m128i *)dst, target);
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dst += 8 - squash;
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}
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}
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return 0;
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}
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int repack_squash_swap(struct audio_repack *repack, const uint8_t *bsrc,
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uint32_t frame_count)
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{
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if (check_buffer(repack, frame_count) < 0)
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return -1;
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int squash = repack->extra_dst_size;
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const __m128i *src = (__m128i *)bsrc;
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const __m128i *esrc = src + frame_count;
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uint16_t *dst = (uint16_t *)repack->packet_buffer;
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while (src != esrc) {
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__m128i target = _mm_load_si128(src++);
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__m128i buf =
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_mm_shufflelo_epi16(target, _MM_SHUFFLE(2, 3, 1, 0));
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_mm_storeu_si128((__m128i *)dst, buf);
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dst += 8 - squash;
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}
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return 0;
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}
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int audio_repack_init(struct audio_repack *repack,
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audio_repack_mode_t repack_mode, uint8_t sample_bit)
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{
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memset(repack, 0, sizeof(*repack));
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if (sample_bit != 16)
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return -1;
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int _audio_repack_ch[8] = {3, 4, 5, 6, 5, 6, 8, 8};
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repack->base_src_size = 8 * (16 / 8);
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repack->base_dst_size = _audio_repack_ch[repack_mode] * (16 / 8);
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repack->extra_dst_size = 8 - _audio_repack_ch[repack_mode];
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repack->repack_func = &repack_squash;
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if (repack_mode == repack_mode_8to5ch_swap ||
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repack_mode == repack_mode_8to6ch_swap ||
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repack_mode == repack_mode_8ch_swap)
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repack->repack_func = &repack_squash_swap;
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return 0;
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}
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void audio_repack_free(struct audio_repack *repack)
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{
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if (repack->packet_buffer)
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bfree(repack->packet_buffer);
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memset(repack, 0, sizeof(*repack));
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}
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