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94 lines
4.2 KiB
Diff
94 lines
4.2 KiB
Diff
# HG changeset patch
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# User Karl Tomlinson <karlt+@karlt.net>
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b=913854 add speex_resampler_set_skip_frac_num r=jmspeex
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This allows a client to align output samples consistently for independent
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resampling of contiguous input buffers.
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diff --git a/media/libspeex_resampler/src/resample.c b/media/libspeex_resampler/src/resample.c
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--- a/media/libspeex_resampler/src/resample.c
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+++ b/media/libspeex_resampler/src/resample.c
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@@ -1128,16 +1128,28 @@ EXPORT int speex_resampler_get_output_la
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EXPORT int speex_resampler_skip_zeros(SpeexResamplerState *st)
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{
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spx_uint32_t i;
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for (i=0;i<st->nb_channels;i++)
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st->last_sample[i] = st->filt_len/2;
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return RESAMPLER_ERR_SUCCESS;
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}
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+EXPORT int speex_resampler_set_skip_frac_num(SpeexResamplerState *st, spx_uint32_t skip_frac_num)
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+{
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+ spx_uint32_t i;
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+ spx_uint32_t last_sample = skip_frac_num / st->den_rate;
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+ spx_uint32_t samp_frac_num = skip_frac_num % st->den_rate;
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+ for (i=0;i<st->nb_channels;i++) {
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+ st->last_sample[i] = last_sample;
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+ st->samp_frac_num[i] = samp_frac_num;
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+ }
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+ return RESAMPLER_ERR_SUCCESS;
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+}
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+
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EXPORT int speex_resampler_reset_mem(SpeexResamplerState *st)
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{
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spx_uint32_t i;
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for (i=0;i<st->nb_channels;i++)
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{
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st->last_sample[i] = 0;
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st->magic_samples[i] = 0;
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st->samp_frac_num[i] = 0;
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diff --git a/media/libspeex_resampler/src/speex_resampler.h b/media/libspeex_resampler/src/speex_resampler.h
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--- a/media/libspeex_resampler/src/speex_resampler.h
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+++ b/media/libspeex_resampler/src/speex_resampler.h
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@@ -69,16 +69,17 @@
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#define speex_resampler_get_quality CAT_PREFIX(RANDOM_PREFIX,_resampler_get_quality)
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#define speex_resampler_set_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_input_stride)
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#define speex_resampler_get_input_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_stride)
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#define speex_resampler_set_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_set_output_stride)
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#define speex_resampler_get_output_stride CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_stride)
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#define speex_resampler_get_input_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_input_latency)
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#define speex_resampler_get_output_latency CAT_PREFIX(RANDOM_PREFIX,_resampler_get_output_latency)
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#define speex_resampler_skip_zeros CAT_PREFIX(RANDOM_PREFIX,_resampler_skip_zeros)
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+#define speex_resampler_set_skip_frac_num CAT_PREFIX(RANDOM_PREFIX,_resampler_set_skip_frac_num)
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#define speex_resampler_reset_mem CAT_PREFIX(RANDOM_PREFIX,_resampler_reset_mem)
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#define speex_resampler_strerror CAT_PREFIX(RANDOM_PREFIX,_resampler_strerror)
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#define spx_int16_t short
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#define spx_int32_t int
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#define spx_uint16_t unsigned short
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#define spx_uint32_t unsigned int
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@@ -317,16 +318,32 @@ int speex_resampler_get_output_latency(S
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* resampler. It is recommended to use that when resampling an audio file, as
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* it will generate a file with the same length. For real-time processing,
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* it is probably easier not to use this call (so that the output duration
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* is the same for the first frame).
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* @param st Resampler state
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*/
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int speex_resampler_skip_zeros(SpeexResamplerState *st);
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+/** Set the numerator in a fraction determining the advance through input
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+ * samples before writing any output samples. The denominator of the fraction
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+ * is the value returned from speex_resampler_get_ratio() in ratio_den. This
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+ * is only useful before starting to use a newly created or reset resampler.
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+ * If the first input sample is interpreted as the signal at time
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+ * input_latency*in_rate, then the first output sample represents the signal
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+ * at the time frac_num/ratio_num*out_rate.
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+ * This is intended for careful alignment of output sample points wrt input
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+ * sample points. Large values are not an efficient offset into the in buffer.
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+ * @param st Resampler state
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+ * @param skip_frac_num Numerator of the offset fraction,
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+ * between 0 and ratio_den-1.
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+ */
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+int speex_resampler_set_skip_frac_num(SpeexResamplerState *st,
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+ spx_uint32_t skip_frac_num);
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+
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/** Reset a resampler so a new (unrelated) stream can be processed.
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* @param st Resampler state
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*/
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int speex_resampler_reset_mem(SpeexResamplerState *st);
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/** Returns the English meaning for an error code
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* @param err Error code
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* @return English string
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