-/* GStreamer
- * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
- * PCM - A-Law conversion
- * Copyright (C) 2000 by Abramo Bagnara <abramo@alsa-project.org>
+/* GStreamer A-Law to PCM conversion
+ * Copyright (C) 2000 by Abramo Bagnara <abramo@alsa-project.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
+/**
+ * SECTION:element-alawdec
+ *
+ * This element decodes alaw audio. Alaw coding is also known as G.711.
+ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <gst/gst.h>
-#include "alaw-decode.h"
-extern GstPadTemplate *alawdec_src_template, *alawdec_sink_template;
+#include "alaw-decode.h"
-/* Stereo signals and args */
-enum
-{
- /* FILL ME */
- LAST_SIGNAL
+extern GstStaticPadTemplate alaw_dec_src_factory;
+extern GstStaticPadTemplate alaw_dec_sink_factory;
+
+GST_DEBUG_CATEGORY_STATIC (alaw_dec_debug);
+#define GST_CAT_DEFAULT alaw_dec_debug
+
+static GstStateChangeReturn
+gst_alaw_dec_change_state (GstElement * element, GstStateChange transition);
+static GstFlowReturn gst_alaw_dec_chain (GstPad * pad, GstBuffer * buffer);
+
+GST_BOILERPLATE (GstALawDec, gst_alaw_dec, GstElement, GST_TYPE_ELEMENT);
+
+/* some day we might have defines in gstconfig.h that tell us about the
+ * desired cpu/memory/binary size trade-offs */
+#define GST_ALAW_DEC_USE_TABLE
+
+#ifdef GST_ALAW_DEC_USE_TABLE
+
+static const gint alaw_to_s16_table[256] = {
+ -5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,
+ -7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,
+ -2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,
+ -3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,
+ -22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944,
+ -30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136,
+ -11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472,
+ -15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568,
+ -344, -328, -376, -360, -280, -264, -312, -296,
+ -472, -456, -504, -488, -408, -392, -440, -424,
+ -88, -72, -120, -104, -24, -8, -56, -40,
+ -216, -200, -248, -232, -152, -136, -184, -168,
+ -1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,
+ -1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,
+ -688, -656, -752, -720, -560, -528, -624, -592,
+ -944, -912, -1008, -976, -816, -784, -880, -848,
+ 5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736,
+ 7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784,
+ 2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368,
+ 3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392,
+ 22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,
+ 30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,
+ 11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472,
+ 15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,
+ 344, 328, 376, 360, 280, 264, 312, 296,
+ 472, 456, 504, 488, 408, 392, 440, 424,
+ 88, 72, 120, 104, 24, 8, 56, 40,
+ 216, 200, 248, 232, 152, 136, 184, 168,
+ 1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184,
+ 1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696,
+ 688, 656, 752, 720, 560, 528, 624, 592,
+ 944, 912, 1008, 976, 816, 784, 880, 848
};
-enum
+static inline gint
+alaw_to_s16 (guint8 a_val)
{
- ARG_0
-};
-
-static void gst_alawdec_class_init (GstALawDecClass * klass);
-static void gst_alawdec_base_init (GstALawDecClass * klass);
-static void gst_alawdec_init (GstALawDec * alawdec);
-
-static void gst_alawdec_chain (GstPad * pad, GstData * _data);
-
-static GstElementClass *parent_class = NULL;
+ return alaw_to_s16_table[a_val];
+}
-/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
+#else /* GST_ALAW_DEC_USE_TABLE */
-/*
- * alaw_to_s16() - Convert an A-law value to 16-bit linear PCM
- *
- */
-static gint
+static inline gint
alaw_to_s16 (guint8 a_val)
{
gint t;
return ((a_val & 0x80) ? t : -t);
}
-static GstCaps *
-alawdec_getcaps (GstPad * pad)
+#endif /* GST_ALAW_DEC_USE_TABLE */
+
+static gboolean
+gst_alaw_dec_sink_setcaps (GstPad * pad, GstCaps * caps)
{
- GstALawDec *alawdec = GST_ALAWDEC (gst_pad_get_parent (pad));
- GstPad *otherpad;
- GstCaps *base_caps, *othercaps;
+ GstALawDec *alawdec;
GstStructure *structure;
- const GValue *rate, *chans;
+ int rate, channels;
+ gboolean ret;
+ GstCaps *outcaps;
- if (pad == alawdec->sinkpad) {
- otherpad = alawdec->srcpad;
- base_caps = gst_caps_new_simple ("audio/x-alaw", NULL);
- } else {
- otherpad = alawdec->sinkpad;
- base_caps = gst_caps_new_simple ("audio/x-raw-int",
- "width", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16,
- "signed", G_TYPE_BOOLEAN, TRUE,
- "endianness", G_TYPE_INT, G_BYTE_ORDER,
- "signed", G_TYPE_BOOLEAN, TRUE, NULL);
+ alawdec = GST_ALAW_DEC (GST_PAD_PARENT (pad));
+
+ structure = gst_caps_get_structure (caps, 0);
+
+ ret = gst_structure_get_int (structure, "rate", &rate);
+ ret &= gst_structure_get_int (structure, "channels", &channels);
+ if (!ret)
+ return FALSE;
+
+ outcaps = gst_caps_new_simple ("audio/x-raw-int",
+ "width", G_TYPE_INT, 16,
+ "depth", G_TYPE_INT, 16,
+ "endianness", G_TYPE_INT, G_BYTE_ORDER,
+ "signed", G_TYPE_BOOLEAN, TRUE,
+ "rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, channels, NULL);
+
+ ret = gst_pad_set_caps (alawdec->srcpad, outcaps);
+ gst_caps_unref (outcaps);
+
+ if (ret) {
+ GST_DEBUG_OBJECT (alawdec, "rate=%d, channels=%d", rate, channels);
+ alawdec->rate = rate;
+ alawdec->channels = channels;
}
- othercaps = gst_pad_get_allowed_caps (otherpad);
-
- /* Not fully correct, but usually, all structures in a caps have
- * the same samplerate and channels range. */
- structure = gst_caps_get_structure (othercaps, 0);
- rate = gst_structure_get_value (structure, "rate");
- chans = gst_structure_get_value (structure, "channels");
- if (!rate || !chans)
- return gst_caps_new_empty ();
-
- /* Set the samplerate/channels on the to-be-returned caps */
- structure = gst_caps_get_structure (base_caps, 0);
- gst_structure_set_value (structure, "rate", rate);
- gst_structure_set_value (structure, "channels", chans);
- gst_caps_free (othercaps);
-
- return base_caps;
+ return ret;
}
-static GstPadLinkReturn
-alawdec_link (GstPad * pad, const GstCaps * caps)
+static GstCaps *
+gst_alaw_dec_getcaps (GstPad * pad)
{
- GstALawDec *alawdec = GST_ALAWDEC (gst_pad_get_parent (pad));
+ GstALawDec *alawdec;
GstPad *otherpad;
- GstStructure *structure;
- const GValue *rate, *chans;
- GstCaps *base_caps;
- GstPadLinkReturn link_return;
+ GstCaps *othercaps, *result;
+ const GstCaps *templ;
+ const gchar *name;
+ gint i;
- structure = gst_caps_get_structure (caps, 0);
- rate = gst_structure_get_value (structure, "rate");
- chans = gst_structure_get_value (structure, "channels");
- if (!rate || !chans)
- return GST_PAD_LINK_REFUSED;
+ alawdec = GST_ALAW_DEC (GST_PAD_PARENT (pad));
+ /* figure out the name of the caps we are going to return */
if (pad == alawdec->srcpad) {
+ name = "audio/x-raw-int";
otherpad = alawdec->sinkpad;
- base_caps = gst_caps_new_simple ("audio/x-alaw", NULL);
} else {
+ name = "audio/x-alaw";
otherpad = alawdec->srcpad;
- base_caps = gst_caps_new_simple ("audio/x-raw-int",
- "width", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16,
- "endianness", G_TYPE_INT, G_BYTE_ORDER,
- "signed", G_TYPE_BOOLEAN, TRUE, NULL);
}
-
- structure = gst_caps_get_structure (base_caps, 0);
- gst_structure_set_value (structure, "rate", rate);
- gst_structure_set_value (structure, "channels", chans);
-
- link_return = gst_pad_try_set_caps (otherpad, base_caps);
-
- gst_caps_free (base_caps);
-
- return link_return;
-}
-
-GType
-gst_alawdec_get_type (void)
-{
- static GType alawdec_type = 0;
-
- if (!alawdec_type) {
- static const GTypeInfo alawdec_info = {
- sizeof (GstALawDecClass),
- (GBaseInitFunc) gst_alawdec_base_init,
- NULL,
- (GClassInitFunc) gst_alawdec_class_init,
- NULL,
- NULL,
- sizeof (GstALawDec),
- 0,
- (GInstanceInitFunc) gst_alawdec_init,
- };
-
- alawdec_type =
- g_type_register_static (GST_TYPE_ELEMENT, "GstALawDec", &alawdec_info,
- 0);
+ /* get caps from the peer, this can return NULL when there is no peer */
+ othercaps = gst_pad_peer_get_caps (otherpad);
+
+ /* get the template caps to make sure we return something acceptable */
+ templ = gst_pad_get_pad_template_caps (pad);
+
+ if (othercaps) {
+ /* there was a peer */
+ othercaps = gst_caps_make_writable (othercaps);
+
+ /* go through the caps and remove the fields we don't want */
+ for (i = 0; i < gst_caps_get_size (othercaps); i++) {
+ GstStructure *structure;
+
+ structure = gst_caps_get_structure (othercaps, i);
+
+ /* adjust the name */
+ gst_structure_set_name (structure, name);
+
+ if (pad == alawdec->sinkpad) {
+ /* remove the fields we don't want */
+ gst_structure_remove_fields (structure, "width", "depth", "endianness",
+ "signed", NULL);
+ } else {
+ /* add fixed fields */
+ gst_structure_set (structure, "width", G_TYPE_INT, 16,
+ "depth", G_TYPE_INT, 16,
+ "endianness", G_TYPE_INT, G_BYTE_ORDER,
+ "signed", G_TYPE_BOOLEAN, TRUE, NULL);
+ }
+ }
+ /* filter against the allowed caps of the pad to return our result */
+ result = gst_caps_intersect (othercaps, templ);
+ gst_caps_unref (othercaps);
+ } else {
+ /* there was no peer, return the template caps */
+ result = gst_caps_copy (templ);
}
- return alawdec_type;
+
+ return result;
}
static void
-gst_alawdec_base_init (GstALawDecClass * klass)
+gst_alaw_dec_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
- GstElementDetails alawdec_details = {
- "A Law to PCM conversion",
- "Codec/Decoder/Audio",
- "Convert 8bit A law to 16bit PCM",
- "Zaheer Abbas Merali <zaheerabbas at merali dot org>"
- };
-
- gst_element_class_add_pad_template (element_class, alawdec_src_template);
- gst_element_class_add_pad_template (element_class, alawdec_sink_template);
- gst_element_class_set_details (element_class, &alawdec_details);
+
+ gst_element_class_add_static_pad_template (element_class,
+ &alaw_dec_src_factory);
+ gst_element_class_add_static_pad_template (element_class,
+ &alaw_dec_sink_factory);
+
+ gst_element_class_set_details_simple (element_class, "A Law audio decoder",
+ "Codec/Decoder/Audio", "Convert 8bit A law to 16bit PCM",
+ "Zaheer Abbas Merali <zaheerabbas at merali dot org>");
+
+ GST_DEBUG_CATEGORY_INIT (alaw_dec_debug, "alawdec", 0, "A Law audio decoder");
}
static void
-gst_alawdec_class_init (GstALawDecClass * klass)
+gst_alaw_dec_class_init (GstALawDecClass * klass)
{
- parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+ GstElementClass *element_class = (GstElementClass *) klass;
+
+ element_class->change_state = GST_DEBUG_FUNCPTR (gst_alaw_dec_change_state);
}
static void
-gst_alawdec_init (GstALawDec * alawdec)
+gst_alaw_dec_init (GstALawDec * alawdec, GstALawDecClass * klass)
{
- alawdec->sinkpad = gst_pad_new_from_template (alawdec_sink_template, "sink");
- gst_pad_set_link_function (alawdec->sinkpad, alawdec_link);
- gst_pad_set_getcaps_function (alawdec->sinkpad, alawdec_getcaps);
- gst_pad_set_chain_function (alawdec->sinkpad, gst_alawdec_chain);
+ alawdec->sinkpad =
+ gst_pad_new_from_static_template (&alaw_dec_sink_factory, "sink");
+ gst_pad_set_setcaps_function (alawdec->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_alaw_dec_sink_setcaps));
+ gst_pad_set_getcaps_function (alawdec->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_alaw_dec_getcaps));
+ gst_pad_set_chain_function (alawdec->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_alaw_dec_chain));
gst_element_add_pad (GST_ELEMENT (alawdec), alawdec->sinkpad);
- alawdec->srcpad = gst_pad_new_from_template (alawdec_src_template, "src");
- gst_pad_set_link_function (alawdec->srcpad, alawdec_link);
- gst_pad_set_getcaps_function (alawdec->srcpad, alawdec_getcaps);
+ alawdec->srcpad =
+ gst_pad_new_from_static_template (&alaw_dec_src_factory, "src");
+ gst_pad_use_fixed_caps (alawdec->srcpad);
+ gst_pad_set_getcaps_function (alawdec->srcpad,
+ GST_DEBUG_FUNCPTR (gst_alaw_dec_getcaps));
gst_element_add_pad (GST_ELEMENT (alawdec), alawdec->srcpad);
}
-static void
-gst_alawdec_chain (GstPad * pad, GstData * _data)
+static GstFlowReturn
+gst_alaw_dec_chain (GstPad * pad, GstBuffer * buffer)
{
- GstBuffer *buf = GST_BUFFER (_data);
GstALawDec *alawdec;
gint16 *linear_data;
guint8 *alaw_data;
+ guint alaw_size;
GstBuffer *outbuf;
gint i;
+ GstFlowReturn ret;
+
+ alawdec = GST_ALAW_DEC (GST_PAD_PARENT (pad));
+
+ if (G_UNLIKELY (alawdec->rate == 0))
+ goto not_negotiated;
+
+ GST_LOG_OBJECT (alawdec, "buffer with ts=%" GST_TIME_FORMAT,
+ GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
- g_return_if_fail (pad != NULL);
- g_return_if_fail (GST_IS_PAD (pad));
- g_return_if_fail (buf != NULL);
+ alaw_data = GST_BUFFER_DATA (buffer);
+ alaw_size = GST_BUFFER_SIZE (buffer);
- alawdec = GST_ALAWDEC (GST_OBJECT_PARENT (pad));
- g_return_if_fail (alawdec != NULL);
- g_return_if_fail (GST_IS_ALAWDEC (alawdec));
+ ret =
+ gst_pad_alloc_buffer_and_set_caps (alawdec->srcpad,
+ GST_BUFFER_OFFSET_NONE, alaw_size * 2, GST_PAD_CAPS (alawdec->srcpad),
+ &outbuf);
+ if (ret != GST_FLOW_OK)
+ goto alloc_failed;
- alaw_data = (guint8 *) GST_BUFFER_DATA (buf);
- outbuf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) * 2);
- GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
- GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buf);
linear_data = (gint16 *) GST_BUFFER_DATA (outbuf);
- for (i = 0; i < GST_BUFFER_SIZE (buf); i++) {
- *linear_data = alaw_to_s16 (*alaw_data);
- linear_data++;
- alaw_data++;
+ /* copy discont flag */
+ if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
+ GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
+
+ GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
+ GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buffer);
+ gst_buffer_set_caps (outbuf, GST_PAD_CAPS (alawdec->srcpad));
+
+ for (i = 0; i < alaw_size; i++) {
+ linear_data[i] = alaw_to_s16 (alaw_data[i]);
+ }
+ gst_buffer_unref (buffer);
+
+ ret = gst_pad_push (alawdec->srcpad, outbuf);
+
+ return ret;
+
+not_negotiated:
+ {
+ gst_buffer_unref (buffer);
+ GST_WARNING_OBJECT (alawdec, "no input format set: not-negotiated");
+ return GST_FLOW_NOT_NEGOTIATED;
+ }
+alloc_failed:
+ {
+ gst_buffer_unref (buffer);
+ GST_DEBUG_OBJECT (alawdec, "pad alloc failed, flow: %s",
+ gst_flow_get_name (ret));
+ return ret;
+ }
+}
+
+static GstStateChangeReturn
+gst_alaw_dec_change_state (GstElement * element, GstStateChange transition)
+{
+ GstStateChangeReturn ret;
+ GstALawDec *dec = GST_ALAW_DEC (element);
+
+ switch (transition) {
+ default:
+ break;
+ }
+
+ ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+ if (ret != GST_STATE_CHANGE_SUCCESS)
+ return ret;
+
+ switch (transition) {
+ case GST_STATE_CHANGE_PAUSED_TO_READY:
+ dec->rate = 0;
+ dec->channels = 0;
+ break;
+ default:
+ break;
}
- gst_buffer_unref (buf);
- gst_pad_push (alawdec->srcpad, GST_DATA (outbuf));
+ return ret;
}
projects / platform / upstream / gstreamer.git / blobdiff