diff options
Diffstat (limited to 'wearable/gst/law/alaw-decode.c')
| -rw-r--r-- | wearable/gst/law/alaw-decode.c | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/wearable/gst/law/alaw-decode.c b/wearable/gst/law/alaw-decode.c deleted file mode 100644 index 2fa6a5d..0000000 --- a/wearable/gst/law/alaw-decode.c +++ /dev/null @@ -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; - const 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_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_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; -} |