mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-12-16 08:56:40 -05:00
e61c2dddb7
fix downsampling/resampling add support for U8 samples git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@49 fefdeb5f-60dc-0310-8127-8f9354f1896f
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <string.h>
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#include "memchunk.h"
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void pa_memchunk_make_writable(struct pa_memchunk *c) {
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struct pa_memblock *n;
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assert(c && c->memblock && c->memblock->ref >= 1);
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if (c->memblock->ref == 1)
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return;
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n = pa_memblock_new(c->length);
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assert(n);
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memcpy(n->data, c->memblock->data+c->index, c->length);
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pa_memblock_unref(c->memblock);
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c->memblock = n;
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c->index = 0;
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}
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struct pa_mcalign {
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size_t base;
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struct pa_memchunk chunk;
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uint8_t *buffer;
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size_t buffer_fill;
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};
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struct pa_mcalign *pa_mcalign_new(size_t base) {
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struct pa_mcalign *m;
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assert(base);
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m = malloc(sizeof(struct pa_mcalign));
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assert(m);
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m->base = base;
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m->chunk.memblock = NULL;
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m->chunk.length = m->chunk.index = 0;
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m->buffer = NULL;
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m->buffer_fill = 0;
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return m;
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}
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void pa_mcalign_free(struct pa_mcalign *m) {
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assert(m);
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free(m->buffer);
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if (m->chunk.memblock)
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pa_memblock_unref(m->chunk.memblock);
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free(m);
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}
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void pa_mcalign_push(struct pa_mcalign *m, const struct pa_memchunk *c) {
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assert(m && c && !m->chunk.memblock && c->memblock && c->length);
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m->chunk = *c;
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pa_memblock_ref(m->chunk.memblock);
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}
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int pa_mcalign_pop(struct pa_mcalign *m, struct pa_memchunk *c) {
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assert(m && c && m->base > m->buffer_fill);
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int ret;
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if (!m->chunk.memblock)
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return -1;
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if (m->buffer_fill) {
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size_t l = m->base - m->buffer_fill;
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if (l > m->chunk.length)
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l = m->chunk.length;
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assert(m->buffer && l);
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memcpy(m->buffer + m->buffer_fill, m->chunk.memblock->data + m->chunk.index, l);
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m->buffer_fill += l;
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m->chunk.index += l;
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m->chunk.length -= l;
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if (m->chunk.length == 0) {
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m->chunk.length = m->chunk.index = 0;
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pa_memblock_unref(m->chunk.memblock);
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m->chunk.memblock = NULL;
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}
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assert(m->buffer_fill <= m->base);
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if (m->buffer_fill == m->base) {
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c->memblock = pa_memblock_new_dynamic(m->buffer, m->base);
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assert(c->memblock);
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c->index = 0;
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c->length = m->base;
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m->buffer = NULL;
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m->buffer_fill = 0;
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return 0;
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}
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return -1;
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}
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m->buffer_fill = m->chunk.length % m->base;
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if (m->buffer_fill) {
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assert(!m->buffer);
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m->buffer = malloc(m->base);
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assert(m->buffer);
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m->chunk.length -= m->buffer_fill;
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memcpy(m->buffer, m->chunk.memblock->data + m->chunk.index + m->chunk.length, m->buffer_fill);
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}
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if (m->chunk.length) {
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*c = m->chunk;
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pa_memblock_ref(c->memblock);
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ret = 0;
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} else
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ret = -1;
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m->chunk.length = m->chunk.index = 0;
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pa_memblock_unref(m->chunk.memblock);
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m->chunk.memblock = NULL;
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return ret;
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}
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