--- a/gst_plugins_good/gst/law/alaw-decode.c Fri Jul 09 16:26:45 2010 -0500
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,344 +0,0 @@
-/* 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
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * 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 "alaw-decode.h"
-
-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
-};
-
-static inline gint
-alaw_to_s16 (guint8 a_val)
-{
- return alaw_to_s16_table[a_val];
-}
-
-#else /* GST_ALAW_DEC_USE_TABLE */
-
-static inline gint
-alaw_to_s16 (guint8 a_val)
-{
- gint t;
- gint seg;
-
- a_val ^= 0x55;
- t = a_val & 0x7f;
- if (t < 16)
- t = (t << 4) + 8;
- else {
- seg = (t >> 4) & 0x07;
- t = ((t & 0x0f) << 4) + 0x108;
- t <<= seg - 1;
- }
- return ((a_val & 0x80) ? t : -t);
-}
-
-#endif /* GST_ALAW_DEC_USE_TABLE */
-
-static gboolean
-gst_alaw_dec_sink_setcaps (GstPad * pad, GstCaps * caps)
-{
- GstALawDec *alawdec;
- GstStructure *structure;
- int rate, channels;
- gboolean ret;
- GstCaps *outcaps;
-
- 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;
- }
- return ret;
-}
-
-static GstCaps *
-gst_alaw_dec_getcaps (GstPad * pad)
-{
- GstALawDec *alawdec;
- GstPad *otherpad;
- GstCaps *othercaps, *result;
- const GstCaps *templ;
- gchar *name;
- gint i;
-
- 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;
- } else {
- name = "audio/x-alaw";
- otherpad = alawdec->srcpad;
- }
- /* 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 result;
-}
-
-static void
-gst_alaw_dec_base_init (gpointer klass)
-{
- GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
-
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&alaw_dec_src_factory));
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&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_alaw_dec_class_init (GstALawDecClass * klass)
-{
- GstElementClass *element_class = (GstElementClass *) klass;
-
- element_class->change_state = GST_DEBUG_FUNCPTR (gst_alaw_dec_change_state);
-}
-
-static void
-gst_alaw_dec_init (GstALawDec * alawdec, GstALawDecClass * klass)
-{
- 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_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 GstFlowReturn
-gst_alaw_dec_chain (GstPad * pad, GstBuffer * buffer)
-{
- 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)));
-
- alaw_data = GST_BUFFER_DATA (buffer);
- alaw_size = GST_BUFFER_SIZE (buffer);
-
- 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;
-
- linear_data = (gint16 *) GST_BUFFER_DATA (outbuf);
-
- /* 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;
- }
-
- return ret;
-}