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adpcmdec: Add new plugin for ms-adpcm decoding.
This commit is contained in:
Michael Smith
parent
0444aa3374
commit
1a98c66f4a
4 changed files with 467 additions and 1 deletions
2
common
2
common
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@ -1 +1 @@
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Subproject commit 888e0a268b60904dd208b672a3c57f1ff7d9786c
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Subproject commit 6ab11d17cb8e4d1ed755da7accac9630d567a097
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@ -251,6 +251,7 @@ dnl *** plug-ins to include ***
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dnl these are all the gst plug-ins, compilable without additional libs
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AG_GST_CHECK_PLUGIN(aacparse)
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AG_GST_CHECK_PLUGIN(adpcmdec)
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AG_GST_CHECK_PLUGIN(aiffparse)
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AG_GST_CHECK_PLUGIN(amrparse)
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AG_GST_CHECK_PLUGIN(autoconvert)
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@ -1560,6 +1561,7 @@ common/shave-libtool
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gst-plugins-bad.spec
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gst/Makefile
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gst/aacparse/Makefile
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gst/adpcmdec/Makefile
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gst/aiffparse/Makefile
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gst/amrparse/Makefile
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gst/autoconvert/Makefile
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12
gst/adpcmdec/Makefile.am
Normal file
12
gst/adpcmdec/Makefile.am
Normal file
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@ -0,0 +1,12 @@
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plugin_LTLIBRARIES = libgstadpcmdec.la
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# sources used to compile this plug-in
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libgstadpcmdec_la_SOURCES = adpcmdec.c
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# flags used to compile this plugin
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# add other _CFLAGS and _LIBS as needed
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libgstadpcmdec_la_CFLAGS = $(GST_CFLAGS) $(GST_BASE_CFLAGS)
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libgstadpcmdec_la_LIBADD = $(GST_LIBS) $(GST_BASE_LIBS)
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libgstadpcmdec_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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libgstadpcmdec_la_LIBTOOLFLAGS = --tag=disable-static
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452
gst/adpcmdec/adpcmdec.c
Normal file
452
gst/adpcmdec/adpcmdec.c
Normal file
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@ -0,0 +1,452 @@
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/* GStreamer
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* Copyright (C) 2009 Pioneers of the Inevitable <songbird@songbirdnest.com>
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*
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* Authors: Michael Smith <msmith@songbirdnest.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* Based on MS-ADPCM decoder in libsndfile,
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Copyright (C) 1999-2002 Erik de Castro Lopo <erikd@zip.com.au
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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#define GST_TYPE_ADPCM_DEC \
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(adpcmdec_get_type ())
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#define GST_ADPCM_DEC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ADPCM_DEC, ADPCMDec))
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#define GST_CAT_DEFAULT adpcmdec_debug
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GST_DEBUG_CATEGORY_STATIC (adpcmdec_debug);
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static const GstElementDetails adpcmdec_details =
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GST_ELEMENT_DETAILS ("MS-ADPCM decoder",
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"Codec/Decoder/Audio",
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"Decode MS AD-PCM audio",
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"Pioneers of the Inevitable <songbird@songbirdnest.com");
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static GstStaticPadTemplate adpcmdec_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-adpcm, "
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"layout=(string)microsoft, "
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"block_align = (int) [64, 8096], "
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"rate = (int)[ 1, MAX ], " "channels = (int)[1,2]")
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);
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static GstStaticPadTemplate adpcmdec_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw-int, "
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"depth = (int)16, "
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"width = (int)16, "
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"endianness = (int)" G_STRINGIFY (G_BYTE_ORDER) ", "
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"signed = (boolean)TRUE, "
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"channels = (int) [1,2], " "rate = (int)[1, MAX]")
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);
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typedef struct _ADPCMDecClass
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{
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GstElementClass parent_class;
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} ADPCMDecClass;
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typedef struct _ADPCMDec
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{
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GstElement parent;
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GstPad *sinkpad;
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GstPad *srcpad;
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GstCaps *output_caps;
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int rate;
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int channels;
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int blocksize;
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gboolean is_setup;
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GstClockTime timestamp;
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guint64 out_samples;
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GstAdapter *adapter;
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} ADPCMDec;
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GST_BOILERPLATE (ADPCMDec, adpcmdec, GstElement, GST_TYPE_ELEMENT);
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static gboolean
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adpcmdec_setup (ADPCMDec * dec)
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{
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dec->output_caps = gst_caps_new_simple ("audio/x-raw-int",
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"rate", G_TYPE_INT, dec->rate,
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"channels", G_TYPE_INT, dec->channels,
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"width", G_TYPE_INT, 16,
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"depth", G_TYPE_INT, 16,
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"endianness", G_TYPE_INT, G_BYTE_ORDER,
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"signed", G_TYPE_BOOLEAN, TRUE, NULL);
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if (dec->output_caps) {
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gst_pad_set_caps (dec->srcpad, dec->output_caps);
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}
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dec->is_setup = TRUE;
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dec->timestamp = GST_CLOCK_TIME_NONE;
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dec->adapter = gst_adapter_new ();
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dec->out_samples = 0;
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return gst_pad_push_event (dec->srcpad, gst_event_new_new_segment (FALSE,
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1.0, GST_FORMAT_TIME, 0, -1, 0));
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}
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static void
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adpcmdec_teardown (ADPCMDec * dec)
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{
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if (dec->output_caps) {
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gst_caps_unref (dec->output_caps);
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dec->output_caps = NULL;
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}
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if (dec->adapter) {
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g_object_unref (dec->adapter);
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dec->adapter = NULL;
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}
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dec->is_setup = FALSE;
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}
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static gboolean
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adpcmdec_sink_setcaps (GstPad * pad, GstCaps * caps)
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{
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ADPCMDec *dec = (ADPCMDec *) gst_pad_get_parent (pad);
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GstStructure *structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "block_align", &dec->blocksize))
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return FALSE;
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if (!gst_structure_get_int (structure, "rate", &dec->rate))
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return FALSE;
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if (!gst_structure_get_int (structure, "channels", &dec->channels))
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return FALSE;
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if (dec->is_setup)
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adpcmdec_teardown (dec);
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gst_object_unref (dec);
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return TRUE;
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}
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/*=====================================================================
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* From libsndfile:
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*
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* MS ADPCM Block Layout.
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* ======================
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* Block is usually 256, 512 or 1024 bytes depending on sample rate.
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* For a mono file, the block is laid out as follows:
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* byte purpose
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* 0 block predictor [0..6]
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* 1,2 initial idelta (positive)
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* 3,4 sample 1
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* 5,6 sample 0
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* 7..n packed bytecodes
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*
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* For a stereo file, the block is laid out as follows:
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* byte purpose
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* 0 block predictor [0..6] for left channel
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* 1 block predictor [0..6] for right channel
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* 2,3 initial idelta (positive) for left channel
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* 4,5 initial idelta (positive) for right channel
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* 6,7 sample 1 for left channel
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* 8,9 sample 1 for right channel
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* 10,11 sample 0 for left channel
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* 12,13 sample 0 for right channel
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* 14..n packed bytecodes
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*
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*=====================================================================
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*/
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static int AdaptationTable[] = {
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230, 230, 230, 230, 307, 409, 512, 614,
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768, 614, 512, 409, 307, 230, 230, 230
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};
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static int AdaptCoeff1[] = {
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256, 512, 0, 192, 240, 460, 392
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};
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static int AdaptCoeff2[] = {
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0, -256, 0, 64, 0, -208, -232
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};
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static gint16
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read_sample (guint8 * data)
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{
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guint16 val = data[0] | (data[1] << 8);
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return *((gint16 *) & val);
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}
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/* Decode a single block of data from 'data', storing 'n_samples' decoded 16 bit
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samples in 'samples'.
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All buffer lengths have been verified by the caller
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*/
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static gboolean
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adpcmdec_decode_ms_block (ADPCMDec * dec, int n_samples, guint8 * data,
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gint16 * samples)
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{
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gint16 pred[2];
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gint16 idelta[2];
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int idx; /* Current byte offset in 'data' */
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int i; /* Current sample index in 'samples' */
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/* Read the block header, verify for sanity */
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if (dec->channels == 1) {
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pred[0] = data[0];
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idelta[0] = read_sample (data + 1);
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samples[1] = read_sample (data + 3);
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samples[0] = read_sample (data + 5);
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idx = 7;
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i = 2;
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if (pred[0] < 0 || pred[0] > 6) {
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GST_WARNING_OBJECT (dec, "Invalid block predictor");
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return FALSE;
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}
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}
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else {
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pred[0] = data[0];
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pred[1] = data[1];
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idelta[0] = read_sample (data + 2);
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idelta[1] = read_sample (data + 4);
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samples[2] = read_sample (data + 6);
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samples[3] = read_sample (data + 8);
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samples[0] = read_sample (data + 10);
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samples[1] = read_sample (data + 12);
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idx = 14;
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i = 4;
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if (pred[0] < 0 || pred[0] > 6 || pred[1] < 0 || pred[1] > 6) {
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GST_WARNING_OBJECT (dec, "Invalid block predictor");
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return FALSE;
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}
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}
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for (; i < n_samples; i++) {
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int chan = i % dec->channels;
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int bytecode;
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int delta;
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int current;
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int predict;
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if (i % 2 == 0) {
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bytecode = (data[idx] >> 4) & 0x0F;
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} else {
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bytecode = data[idx] & 0x0F;
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idx++;
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}
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delta = idelta[chan];
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idelta[chan] = (AdaptationTable[bytecode] * delta) >> 8;
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if (idelta[chan] < 16)
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idelta[chan] = 16;
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/* Bytecode is used above as an index into the table. Below, it's used
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as a signed 4-bit value; convert appropriately */
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if (bytecode & 0x8)
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bytecode -= 0x10;
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predict = ((samples[i - dec->channels] * AdaptCoeff1[pred[chan]]) +
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(samples[i - 2 * dec->channels] * AdaptCoeff2[pred[chan]])
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) >> 8;
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current = (bytecode * delta) + predict;
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/* Clamp to 16 bits, store decoded sample */
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samples[i] = CLAMP (current, G_MININT16, G_MAXINT16);
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}
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return TRUE;
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}
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static GstFlowReturn
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adpcmdec_chain (GstPad * pad, GstBuffer * buf)
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{
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ADPCMDec *dec = (ADPCMDec *) gst_pad_get_parent (pad);
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GstFlowReturn ret = GST_FLOW_OK;
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guint8 *data;
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GstBuffer *outbuf = NULL;
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GstBuffer *databuf = NULL;
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int outsize;
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int samples;
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gboolean res;
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if (!dec->is_setup)
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adpcmdec_setup (dec);
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if (dec->timestamp == GST_CLOCK_TIME_NONE)
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dec->timestamp = GST_BUFFER_TIMESTAMP (buf);
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gst_adapter_push (dec->adapter, buf);
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while (gst_adapter_available (dec->adapter) >= dec->blocksize) {
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databuf = gst_adapter_take_buffer (dec->adapter, dec->blocksize);
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data = GST_BUFFER_DATA (databuf);
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/* Each block has a 3 byte header per channel, plus 4 bytes per channel to
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give two initial sample values per channel. Then the remainder gives
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two samples per byte */
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samples = (dec->blocksize - 7 * dec->channels) * 2 + 2 * dec->channels;
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outsize = 2 * samples;
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outbuf = gst_buffer_new_and_alloc (outsize);
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res = adpcmdec_decode_ms_block (dec, samples, data,
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(gint16 *) (GST_BUFFER_DATA (outbuf)));
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/* Done with input data, free it */
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gst_buffer_unref (databuf);
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if (!res) {
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gst_buffer_unref (outbuf);
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GST_WARNING_OBJECT (dec, "Decode of block failed");
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ret = GST_FLOW_ERROR;
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goto done;
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}
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gst_buffer_set_caps (outbuf, dec->output_caps);
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GST_BUFFER_TIMESTAMP (outbuf) = dec->timestamp;
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dec->out_samples += samples / dec->channels;
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dec->timestamp =
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gst_util_uint64_scale_int (dec->out_samples, GST_SECOND, dec->rate);
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GST_BUFFER_DURATION (outbuf) =
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dec->timestamp - GST_BUFFER_TIMESTAMP (outbuf);
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ret = gst_pad_push (dec->srcpad, outbuf);
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if (ret != GST_FLOW_OK)
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goto done;
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}
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done:
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gst_object_unref (dec);
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return ret;
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}
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static gboolean
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adpcmdec_sink_event (GstPad * pad, GstEvent * event)
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{
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ADPCMDec *dec = (ADPCMDec *) gst_pad_get_parent (pad);
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gboolean res;
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_STOP:
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gst_adapter_clear (dec->adapter);
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/* Fall through */
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default:
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res = gst_pad_push_event (dec->srcpad, event);
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break;
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}
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gst_object_unref (dec);
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return res;
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}
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static GstStateChangeReturn
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adpcmdec_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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ADPCMDec *dec = (ADPCMDec *) element;
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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break;
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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adpcmdec_teardown (dec);
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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adpcmdec_dispose (GObject * obj)
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{
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G_OBJECT_CLASS (parent_class)->dispose (obj);
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}
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static void
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adpcmdec_init (ADPCMDec * dec, ADPCMDecClass * klass)
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{
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dec->sinkpad =
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gst_pad_new_from_static_template (&adpcmdec_sink_template, "sink");
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gst_pad_set_setcaps_function (dec->sinkpad,
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GST_DEBUG_FUNCPTR (adpcmdec_sink_setcaps));
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gst_pad_set_chain_function (dec->sinkpad, GST_DEBUG_FUNCPTR (adpcmdec_chain));
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gst_pad_set_event_function (dec->sinkpad,
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GST_DEBUG_FUNCPTR (adpcmdec_sink_event));
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gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
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dec->srcpad =
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gst_pad_new_from_static_template (&adpcmdec_src_template, "src");
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gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
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}
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static void
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adpcmdec_class_init (ADPCMDecClass * klass)
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{
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GObjectClass *gobjectclass = (GObjectClass *) klass;
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GstElementClass *gstelement_class = (GstElementClass *) klass;
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gobjectclass->dispose = adpcmdec_dispose;
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gstelement_class->change_state = adpcmdec_change_state;
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||||
} static void
|
||||
|
||||
adpcmdec_base_init (gpointer klass)
|
||||
{
|
||||
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
|
||||
gst_element_class_add_pad_template (element_class,
|
||||
gst_static_pad_template_get (&adpcmdec_sink_template));
|
||||
gst_element_class_add_pad_template (element_class,
|
||||
gst_static_pad_template_get (&adpcmdec_src_template));
|
||||
gst_element_class_set_details (element_class, &adpcmdec_details);
|
||||
}
|
||||
|
||||
static gboolean
|
||||
plugin_init (GstPlugin * plugin)
|
||||
{
|
||||
GST_DEBUG_CATEGORY_INIT (adpcmdec_debug, "adpcmdec", 0, "ADPCM Decoders");
|
||||
if (!gst_element_register (plugin, "msadpcmdec", GST_RANK_PRIMARY,
|
||||
GST_TYPE_ADPCM_DEC)) {
|
||||
return FALSE;
|
||||
}
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "adpcmdec",
|
||||
"ADPCM decoder", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME,
|
||||
GST_PACKAGE_ORIGIN);
|
||||
Loading…
Reference in a new issue