diff -r 29ecd5cb86b3 -r d43ce56a1534 gst_plugins_good/gst/law/alaw-encode.c --- a/gst_plugins_good/gst/law/alaw-encode.c Tue Jul 06 14:35:10 2010 +0300 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,524 +0,0 @@ -/* GStreamer PCM to A-Law conversion - * Copyright (C) 2000 by Abramo Bagnara - * - * 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-alawenc - * - * This element encode alaw audio. Alaw coding is also known as G.711. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "alaw-encode.h" - -GST_DEBUG_CATEGORY_STATIC (alaw_enc_debug); -#define GST_CAT_DEFAULT alaw_enc_debug - -extern GstStaticPadTemplate alaw_enc_src_factory; -extern GstStaticPadTemplate alaw_enc_sink_factory; - -static GstFlowReturn gst_alaw_enc_chain (GstPad * pad, GstBuffer * buffer); - -GST_BOILERPLATE (GstALawEnc, gst_alaw_enc, 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_ENC_USE_TABLE - -#ifdef GST_ALAW_ENC_USE_TABLE - -static const guint8 alaw_encode[2048 + 1] = { - 0xd5, 0xd4, 0xd7, 0xd6, 0xd1, 0xd0, 0xd3, 0xd2, 0xdd, 0xdc, 0xdf, 0xde, - 0xd9, 0xd8, 0xdb, 0xda, 0xc5, 0xc4, 0xc7, 0xc6, 0xc1, 0xc0, 0xc3, 0xc2, - 0xcd, 0xcc, 0xcf, 0xce, 0xc9, 0xc8, 0xcb, 0xca, 0xf5, 0xf5, 0xf4, 0xf4, - 0xf7, 0xf7, 0xf6, 0xf6, 0xf1, 0xf1, 0xf0, 0xf0, 0xf3, 0xf3, 0xf2, 0xf2, - 0xfd, 0xfd, 0xfc, 0xfc, 0xff, 0xff, 0xfe, 0xfe, 0xf9, 0xf9, 0xf8, 0xf8, - 0xfb, 0xfb, 0xfa, 0xfa, 0xe5, 0xe5, 0xe5, 0xe5, 0xe4, 0xe4, 0xe4, 0xe4, - 0xe7, 0xe7, 0xe7, 0xe7, 0xe6, 0xe6, 0xe6, 0xe6, 0xe1, 0xe1, 0xe1, 0xe1, - 0xe0, 0xe0, 0xe0, 0xe0, 0xe3, 0xe3, 0xe3, 0xe3, 0xe2, 0xe2, 0xe2, 0xe2, - 0xed, 0xed, 0xed, 0xed, 0xec, 0xec, 0xec, 0xec, 0xef, 0xef, 0xef, 0xef, - 0xee, 0xee, 0xee, 0xee, 0xe9, 0xe9, 0xe9, 0xe9, 0xe8, 0xe8, 0xe8, 0xe8, - 0xeb, 0xeb, 0xeb, 0xeb, 0xea, 0xea, 0xea, 0xea, 0x95, 0x95, 0x95, 0x95, - 0x95, 0x95, 0x95, 0x95, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, 0x94, - 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x97, 0x96, 0x96, 0x96, 0x96, - 0x96, 0x96, 0x96, 0x96, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, 0x91, - 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x93, 0x93, 0x93, 0x93, - 0x93, 0x93, 0x93, 0x93, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, 0x92, - 0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9d, 0x9c, 0x9c, 0x9c, 0x9c, - 0x9c, 0x9c, 0x9c, 0x9c, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f, 0x9f, - 0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x9e, 0x99, 0x99, 0x99, 0x99, - 0x99, 0x99, 0x99, 0x99, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, 0x98, - 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x9a, 0x9a, 0x9a, 0x9a, - 0x9a, 0x9a, 0x9a, 0x9a, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, - 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x84, 0x84, 0x84, 0x84, - 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, 0x84, - 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, - 0x87, 0x87, 0x87, 0x87, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, - 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x86, 0x81, 0x81, 0x81, 0x81, - 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, - 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, - 0x80, 0x80, 0x80, 0x80, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, - 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x83, 0x82, 0x82, 0x82, 0x82, - 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, 0x82, - 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0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, - 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, - 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, - 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, - 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, 0xae, - 0xae, 0xae, 0xae, 0xae, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, - 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, - 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, - 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, - 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, - 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa9, 0xa8, 0xa8, 0xa8, 0xa8, - 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, - 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, - 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, - 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, - 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, 0xa8, - 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, - 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, - 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, - 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, - 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, 0xab, - 0xab, 0xab, 0xab, 0xab, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, - 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, - 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, - 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, - 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, - 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0x2a -}; - -static inline guint8 -s16_to_alaw (gint16 pcm_val) -{ - if (pcm_val >= 0) - return alaw_encode[pcm_val / 16]; - else - return (0x7F & alaw_encode[pcm_val / -16]); -} - -#else /* GST_ALAW_ENC_USE_TABLE */ - -/* - * s16_to_alaw() - Convert a 16-bit linear PCM value to 8-bit A-law - * - * s16_to_alaw() accepts an 16-bit integer and encodes it as A-law data. - * - * Linear Input Code Compressed Code - * ------------------------ --------------- - * 0000000wxyza 000wxyz - * 0000001wxyza 001wxyz - * 000001wxyzab 010wxyz - * 00001wxyzabc 011wxyz - * 0001wxyzabcd 100wxyz - * 001wxyzabcde 101wxyz - * 01wxyzabcdef 110wxyz - * 1wxyzabcdefg 111wxyz - * - * For further information see John C. Bellamy's Digital Telephony, 1982, - * John Wiley & Sons, pps 98-111 and 472-476. - */ - -static inline gint -val_seg (gint val) -{ - gint r = 1; - - val >>= 8; - if (val & 0xf0) { - val >>= 4; - r += 4; - } - if (val & 0x0c) { - val >>= 2; - r += 2; - } - if (val & 0x02) - r += 1; - return r; -} - -static inline guint8 -s16_to_alaw (gint pcm_val) -{ - gint seg; - guint8 mask; - guint8 aval; - - if (pcm_val >= 0) { - mask = 0xD5; - } else { - mask = 0x55; - pcm_val = -pcm_val; - if (pcm_val > 0x7fff) - pcm_val = 0x7fff; - } - - if (pcm_val < 256) - aval = pcm_val >> 4; - else { - /* Convert the scaled magnitude to segment number. */ - seg = val_seg (pcm_val); - aval = (seg << 4) | ((pcm_val >> (seg + 3)) & 0x0f); - } - return aval ^ mask; -} - -#endif /* GST_ALAW_ENC_USE_TABLE */ - -static GstCaps * -gst_alaw_enc_getcaps (GstPad * pad) -{ - GstALawEnc *alawenc; - GstPad *otherpad; - GstCaps *othercaps, *result; - const GstCaps *templ; - gchar *name; - gint i; - - alawenc = GST_ALAW_ENC (GST_PAD_PARENT (pad)); - - /* figure out the name of the caps we are going to return */ - if (pad == alawenc->srcpad) { - name = "audio/x-alaw"; - otherpad = alawenc->sinkpad; - } else { - name = "audio/x-raw-int"; - otherpad = alawenc->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 == alawenc->srcpad) { - /* 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 gboolean -gst_alaw_enc_setcaps (GstPad * pad, GstCaps * caps) -{ - GstALawEnc *alawenc; - GstPad *otherpad; - GstStructure *structure; - gboolean ret; - GstCaps *base_caps; - - alawenc = GST_ALAW_ENC (GST_PAD_PARENT (pad)); - - structure = gst_caps_get_structure (caps, 0); - gst_structure_get_int (structure, "channels", &alawenc->channels); - gst_structure_get_int (structure, "rate", &alawenc->rate); - - if (pad == alawenc->sinkpad) { - otherpad = alawenc->srcpad; - } else { - otherpad = alawenc->sinkpad; - } - - base_caps = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad)); - structure = gst_caps_get_structure (base_caps, 0); - gst_structure_set (structure, "rate", G_TYPE_INT, alawenc->rate, NULL); - gst_structure_set (structure, "channels", G_TYPE_INT, alawenc->channels, - NULL); - - GST_DEBUG_OBJECT (alawenc, "rate=%d, channels=%d", alawenc->rate, - alawenc->channels); - - ret = gst_pad_set_caps (otherpad, base_caps); - - gst_caps_unref (base_caps); - - return ret; -} - -static void -gst_alaw_enc_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_enc_src_factory)); - gst_element_class_add_pad_template (element_class, - gst_static_pad_template_get (&alaw_enc_sink_factory)); - - gst_element_class_set_details_simple (element_class, - "A Law audio encoder", "Codec/Encoder/Audio", - "Convert 16bit PCM to 8bit A law", - "Zaheer Abbas Merali "); - - GST_DEBUG_CATEGORY_INIT (alaw_enc_debug, "alawenc", 0, "A Law audio encoder"); -} - -static void -gst_alaw_enc_class_init (GstALawEncClass * klass) -{ - /* nothing to do here for now */ -} - -static void -gst_alaw_enc_init (GstALawEnc * alawenc, GstALawEncClass * klass) -{ - alawenc->sinkpad = - gst_pad_new_from_static_template (&alaw_enc_sink_factory, "sink"); - gst_pad_set_setcaps_function (alawenc->sinkpad, - GST_DEBUG_FUNCPTR (gst_alaw_enc_setcaps)); - gst_pad_set_getcaps_function (alawenc->sinkpad, - GST_DEBUG_FUNCPTR (gst_alaw_enc_getcaps)); - gst_pad_set_chain_function (alawenc->sinkpad, - GST_DEBUG_FUNCPTR (gst_alaw_enc_chain)); - gst_element_add_pad (GST_ELEMENT (alawenc), alawenc->sinkpad); - - alawenc->srcpad = - gst_pad_new_from_static_template (&alaw_enc_src_factory, "src"); - gst_pad_set_setcaps_function (alawenc->srcpad, - GST_DEBUG_FUNCPTR (gst_alaw_enc_setcaps)); - gst_pad_set_getcaps_function (alawenc->srcpad, - GST_DEBUG_FUNCPTR (gst_alaw_enc_getcaps)); - gst_pad_use_fixed_caps (alawenc->srcpad); - gst_element_add_pad (GST_ELEMENT (alawenc), alawenc->srcpad); - - /* init rest */ - alawenc->channels = 0; - alawenc->rate = 0; -} - -static GstFlowReturn -gst_alaw_enc_chain (GstPad * pad, GstBuffer * buffer) -{ - GstALawEnc *alawenc; - gint16 *linear_data; - guint linear_size; - guint8 *alaw_data; - guint alaw_size; - GstBuffer *outbuf; - gint i; - GstFlowReturn ret; - GstClockTime timestamp, duration; - - alawenc = GST_ALAW_ENC (GST_PAD_PARENT (pad)); - - if (G_UNLIKELY (alawenc->rate == 0 || alawenc->channels == 0)) - goto not_negotiated; - - linear_data = (gint16 *) GST_BUFFER_DATA (buffer); - linear_size = GST_BUFFER_SIZE (buffer); - - alaw_size = linear_size / 2; - - timestamp = GST_BUFFER_TIMESTAMP (buffer); - duration = GST_BUFFER_DURATION (buffer); - - GST_LOG_OBJECT (alawenc, "buffer with ts=%" GST_TIME_FORMAT, - GST_TIME_ARGS (timestamp)); - - ret = - gst_pad_alloc_buffer_and_set_caps (alawenc->srcpad, - GST_BUFFER_OFFSET_NONE, alaw_size, GST_PAD_CAPS (alawenc->srcpad), - &outbuf); - if (ret != GST_FLOW_OK) - goto done; - - if (duration == GST_CLOCK_TIME_NONE) { - duration = gst_util_uint64_scale_int (alaw_size, - GST_SECOND, alawenc->rate * alawenc->channels); - } - - if (GST_BUFFER_SIZE (outbuf) < alaw_size) { - /* pad-alloc can return a smaller buffer */ - gst_buffer_unref (outbuf); - outbuf = gst_buffer_new_and_alloc (alaw_size); - } - - alaw_data = (guint8 *) 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) = timestamp; - GST_BUFFER_DURATION (outbuf) = duration; - - gst_buffer_set_caps (outbuf, GST_PAD_CAPS (alawenc->srcpad)); - - for (i = 0; i < alaw_size; i++) { - alaw_data[i] = s16_to_alaw (linear_data[i]); - } - - ret = gst_pad_push (alawenc->srcpad, outbuf); - -done: - - gst_buffer_unref (buffer); - - return ret; - -not_negotiated: - { - ret = GST_FLOW_NOT_NEGOTIATED; - goto done; - } -}