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61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
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#ifndef _CODING_UTILS_SAMPLES_
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#define _CODING_UTILS_SAMPLES_
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/* sample helpers */
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//TODO maybe move to .c
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// (as .h can be inlined but these probably aren't called enough times that there is a notable boost)
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typedef struct {
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int16_t* samples; /* current samples (pointer is moved once consumed) */
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int filled; /* samples left */
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int channels; /* max channels sample buf handles */
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//TODO may be more useful with filled+consumed and not moving *samples?
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} s16buf_t;
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static void s16buf_silence(sample_t** p_outbuf, int32_t* p_samples_silence, int channels) {
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int samples_silence;
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samples_silence = *p_samples_silence;
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memset(*p_outbuf, 0, samples_silence * channels * sizeof(int16_t));
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*p_outbuf += samples_silence * channels;
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*p_samples_silence -= samples_silence;
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}
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static void s16buf_discard(sample_t** p_outbuf, s16buf_t* sbuf, int32_t* p_samples_discard) {
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int samples_discard;
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samples_discard = *p_samples_discard;
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if (samples_discard > sbuf->filled)
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samples_discard = sbuf->filled;
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/* just ignore part of samples */
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sbuf->samples += samples_discard * sbuf->channels;
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sbuf->filled -= samples_discard;
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*p_samples_discard -= samples_discard;
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}
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/* copy, move and mark consumed samples */
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static void s16buf_consume(sample_t** p_outbuf, s16buf_t* sbuf, int32_t* p_samples_consume) {
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int samples_consume;
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samples_consume = *p_samples_consume;
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if (samples_consume > sbuf->filled)
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samples_consume = sbuf->filled;
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/* memcpy is safe when filled/samples_copy is 0 (but must pass non-NULL bufs) */
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memcpy(*p_outbuf, sbuf->samples, samples_consume * sbuf->channels * sizeof(int16_t));
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sbuf->samples += samples_consume * sbuf->channels;
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sbuf->filled -= samples_consume;
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*p_outbuf += samples_consume * sbuf->channels;
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*p_samples_consume -= samples_consume;
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}
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#endif /* _CODING_UTILS_SAMPLES_ */
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