/* 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, 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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; } }