--- /dev/null
+/*****************************************************************************
+ * speex.c : libspeex DSP resampler
+ *****************************************************************************
+ * Copyright © 2011 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <vlc_common.h>
+#include <vlc_aout.h>
+#include <vlc_filter.h>
+#include <vlc_plugin.h>
+
+#include <speex/speex_resampler.h>
+
+#define QUALITY_TEXT N_("Resampling quality")
+#define QUALITY_LONGTEXT N_( \
+ "Resampling quality (0 = worst and fastest, 10 = best and slowest).")
+
+static int Open (vlc_object_t *);
+static void Close (vlc_object_t *);
+
+vlc_module_begin ()
+ set_shortname (N_("Speex resampler"))
+ set_description (N_("Speex resampler") )
+ set_category (CAT_AUDIO)
+ set_subcategory (SUBCAT_AUDIO_MISC)
+ add_integer ("speex-resampler-quality", 3,
+ QUALITY_TEXT, QUALITY_LONGTEXT, true)
+ change_integer_range (0, 10)
+ set_capability ("audio filter", 60)
+ set_callbacks (Open, Close)
+vlc_module_end ()
+
+static block_t *Resample (filter_t *, block_t *);
+
+static int Open (vlc_object_t *obj)
+{
+ filter_t *filter = (filter_t *)obj;
+
+ /* Will change rate */
+ if (filter->fmt_in.audio.i_rate == filter->fmt_out.audio.i_rate
+ /* Cannot convert format */
+ || filter->fmt_in.audio.i_format != filter->fmt_out.audio.i_format
+ /* Cannot remix */
+ || filter->fmt_in.audio.i_physical_channels
+ != filter->fmt_out.audio.i_physical_channels
+ || filter->fmt_in.audio.i_original_channels
+ != filter->fmt_out.audio.i_original_channels)
+ return VLC_EGENERIC;
+
+ switch (filter->fmt_in.audio.i_format)
+ {
+ case VLC_CODEC_FL32: break;
+ case VLC_CODEC_S16N: break;
+ default: return VLC_EGENERIC;
+ }
+
+ SpeexResamplerState *st;
+
+ unsigned channels = aout_FormatNbChannels (&filter->fmt_in.audio);
+ unsigned q = var_InheritInteger (obj, "speex-resampler-quality");
+ if (unlikely(q > 10))
+ q = 3;
+
+ int err;
+ st = speex_resampler_init(channels, filter->fmt_in.audio.i_rate,
+ filter->fmt_out.audio.i_rate, q, &err);
+ if (unlikely(st == NULL))
+ {
+ msg_Err (obj, "cannot initialize resampler: %s",
+ speex_resampler_strerror (err));
+ return VLC_ENOMEM;
+ }
+
+ filter->p_sys = (filter_sys_t *)st;
+ filter->pf_audio_filter = Resample;
+ return VLC_SUCCESS;
+}
+
+static void Close (vlc_object_t *obj)
+{
+ filter_t *filter = (filter_t *)obj;
+ SpeexResamplerState *st = (SpeexResamplerState *)filter->p_sys;
+
+ speex_resampler_destroy (st);
+}
+
+static block_t *Resample (filter_t *filter, block_t *in)
+{
+ SpeexResamplerState *st = (SpeexResamplerState *)filter->p_sys;
+
+ const size_t framesize = filter->fmt_out.audio.i_bytes_per_frame;
+ const unsigned irate = filter->fmt_in.audio.i_rate;
+ const unsigned orate = filter->fmt_out.audio.i_rate;
+
+ spx_uint32_t ilen = in->i_nb_samples;
+ spx_uint32_t olen = ((ilen + 1) * orate) / irate;
+
+ block_t *out = block_Alloc (olen * framesize);
+ if (unlikely(out == NULL))
+ goto error;
+
+ speex_resampler_set_rate (st, irate, orate);
+
+ int err;
+ if (filter->fmt_in.audio.i_format == VLC_CODEC_FL32)
+ err = speex_resampler_process_interleaved_float (st,
+ (float *)in->p_buffer, &ilen, (float *)out->p_buffer, &olen);
+ else
+ err = speex_resampler_process_interleaved_int (st,
+ (int16_t *)in->p_buffer, &ilen, (int16_t *)out->p_buffer, &olen);
+ if (err != 0)
+ {
+ msg_Err (filter, "cannot resample: %s",
+ speex_resampler_strerror (err));
+ block_Release (out);
+ out = NULL;
+ goto error;
+ }
+
+ out->i_buffer = olen * framesize;
+ out->i_nb_samples = olen;
+ out->i_pts = in->i_pts;
+ out->i_length = olen * CLOCK_FREQ / filter->fmt_out.audio.i_rate;
+error:
+ block_Release (in);
+ return out;
+}
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