mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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adpcmenc: add new adpcm encoder element.
This commit is contained in:
Peter van Hardenberg
Michael Smith
parent
2dec1de420
commit
4aded03c5e
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@ -254,6 +254,7 @@ 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(adpcmdec)
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AG_GST_CHECK_PLUGIN(adpcmenc)
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AG_GST_CHECK_PLUGIN(aiff)
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AG_GST_CHECK_PLUGIN(asfmux)
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AG_GST_CHECK_PLUGIN(audioparsers)
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@ -1632,6 +1633,7 @@ common/m4/Makefile
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gst-plugins-bad.spec
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gst/Makefile
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gst/adpcmdec/Makefile
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gst/adpcmenc/Makefile
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gst/aiff/Makefile
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gst/asfmux/Makefile
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gst/audioparsers/Makefile
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@ -121,6 +121,7 @@ rm -rf $RPM_BUILD_ROOT
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%{_libdir}/gstreamer-%{majorminor}/libgstrtpmux.so
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%{_libdir}/gstreamer-%{majorminor}/libgstsiren.so
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%{_libdir}/gstreamer-%{majorminor}/libgstadpcmdec.so
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%{_libdir}/gstreamer-%{majorminor}/libgstadpcmenc.so
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%{_libdir}/gstreamer-%{majorminor}/libgstid3tag.so
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%{_libdir}/gstreamer-%{majorminor}/libgsthdvparse.so
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%{_libdir}/gstreamer-%{majorminor}/libgstshapewipe.so
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12
gst/adpcmenc/Makefile.am
Normal file
12
gst/adpcmenc/Makefile.am
Normal file
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@ -0,0 +1,12 @@
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plugin_LTLIBRARIES = libgstadpcmenc.la
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# sources used to compile this plug-in
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libgstadpcmenc_la_SOURCES = adpcmenc.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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libgstadpcmenc_la_CFLAGS = $(GST_CFLAGS) $(GST_BASE_CFLAGS)
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libgstadpcmenc_la_LIBADD = $(GST_LIBS) $(GST_BASE_LIBS)
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libgstadpcmenc_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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libgstadpcmenc_la_LIBTOOLFLAGS = --tag=disable-static
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571
gst/adpcmenc/adpcmenc.c
Normal file
571
gst/adpcmenc/adpcmenc.c
Normal file
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@ -0,0 +1,571 @@
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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: Peter van Hardenberg <pvh@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 ADPCM encoders 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_ENC \
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(adpcmenc_get_type ())
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#define GST_TYPE_ADPCMENC_LAYOUT \
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(adpcmenc_layout_get_type ())
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#define GST_ADPCM_ENC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ADPCM_ENC, ADPCMEnc))
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#define GST_CAT_DEFAULT adpcmenc_debug
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GST_DEBUG_CATEGORY_STATIC (adpcmenc_debug);
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static const GstElementDetails adpcmenc_details =
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GST_ELEMENT_DETAILS ("ADPCM encoder",
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"Codec/Encoder/Audio",
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"Encode ADPCM audio",
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"Pioneers of the Inevitable <songbird@songbirdnest.com");
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static GstStaticPadTemplate adpcmenc_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-raw-int, "
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"depth = (int)16, "
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"width = (int)16, " "channels = (int) [1,2], " "rate = (int)[1, MAX]")
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);
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static GstStaticPadTemplate adpcmenc_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-adpcm, "
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" layout=(string){dvi}, "
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" block_align = (int) [64, 8192], "
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" rate = (int)[ 1, MAX ], " "channels = (int)[1,2];")
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);
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#define MIN_ADPCM_BLOCK_SIZE 64
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#define MAX_ADPCM_BLOCK_SIZE 8192
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#define DEFAULT_ADPCM_BLOCK_SIZE 1024
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#define DEFAULT_ADPCM_LAYOUT LAYOUT_ADPCM_DVI
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static int ima_indx_adjust[16] = {
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-1, -1, -1, -1, 2, 4, 6, 8, -1, -1, -1, -1, 2, 4, 6, 8,
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};
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static int ima_step_size[89] = {
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7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
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50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230,
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253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963,
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1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327,
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3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442,
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11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
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32767
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};
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enum adpcm_properties
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{
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ARG_0,
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ARG_BLOCK_SIZE,
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ARG_LAYOUT
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};
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enum adpcm_layout
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{
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LAYOUT_ADPCM_DVI
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};
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static GType
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adpcmenc_layout_get_type (void)
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{
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static GType adpcmenc_layout_type = 0;
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if (!adpcmenc_layout_type) {
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static GEnumValue layout_types[] = {
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{LAYOUT_ADPCM_DVI, "DVI/IMA APDCM", "dvi"},
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{0, NULL, NULL},
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};
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adpcmenc_layout_type = g_enum_register_static ("GstADPCMEncLayout",
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layout_types);
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}
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return adpcmenc_layout_type;
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}
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typedef struct _ADPCMEncClass
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{
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GstElementClass parent_class;
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} ADPCMEncClass;
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typedef struct _ADPCMEnc
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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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enum adpcm_layout layout;
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int rate;
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int channels;
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int blocksize;
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int samples_per_block;
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guint8 step_index[2];
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gboolean is_setup;
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GstClockTime timestamp;
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GstClockTime base_timestamp;
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guint64 out_samples;
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GstAdapter *adapter;
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} ADPCMEnc;
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GST_BOILERPLATE (ADPCMEnc, adpcmenc, GstElement, GST_TYPE_ELEMENT);
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static gboolean
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adpcmenc_setup (ADPCMEnc * enc)
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{
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const int DVI_IMA_HEADER_SIZE = 4;
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const int ADPCM_SAMPLES_PER_BYTE = 2;
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guint64 sample_bytes;
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char *layout;
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switch (enc->layout) {
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case LAYOUT_ADPCM_DVI:
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layout = "dvi";
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/* IMA ADPCM includes a 4-byte header per channel, */
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sample_bytes = enc->blocksize - (DVI_IMA_HEADER_SIZE * enc->channels);
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/* two samples per byte, plus a single sample in the header. */
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enc->samples_per_block =
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((sample_bytes * ADPCM_SAMPLES_PER_BYTE) / enc->channels) + 1;
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break;
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default:
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GST_WARNING_OBJECT (enc, "Invalid layout");
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return FALSE;
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}
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enc->output_caps = gst_caps_new_simple ("audio/x-adpcm",
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"rate", G_TYPE_INT, enc->rate,
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"channels", G_TYPE_INT, enc->channels,
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"layout", G_TYPE_STRING, layout,
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"block_align", G_TYPE_INT, enc->blocksize, NULL);
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if (enc->output_caps) {
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gst_pad_set_caps (enc->srcpad, enc->output_caps);
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}
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enc->is_setup = TRUE;
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enc->timestamp = GST_CLOCK_TIME_NONE;
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enc->base_timestamp = GST_CLOCK_TIME_NONE;
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enc->adapter = gst_adapter_new ();
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enc->out_samples = 0;
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/* Step index state is carried between blocks. */
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enc->step_index[0] = 0;
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enc->step_index[1] = 0;
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return TRUE;
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}
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static void
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adpcmenc_teardown (ADPCMEnc * enc)
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{
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if (enc->output_caps) {
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gst_caps_unref (enc->output_caps);
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enc->output_caps = NULL;
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}
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if (enc->adapter) {
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g_object_unref (enc->adapter);
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enc->adapter = NULL;
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}
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enc->is_setup = FALSE;
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}
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static gboolean
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adpcmenc_sink_setcaps (GstPad * pad, GstCaps * caps)
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{
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ADPCMEnc *enc = (ADPCMEnc *) 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, "rate", &enc->rate))
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return FALSE;
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if (!gst_structure_get_int (structure, "channels", &enc->channels))
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return FALSE;
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if (enc->is_setup) {
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adpcmenc_teardown (enc);
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}
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adpcmenc_setup (enc);
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gst_object_unref (enc);
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return TRUE;
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}
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static void
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adpcmenc_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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ADPCMEnc *enc = GST_ADPCM_ENC (object);
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switch (prop_id) {
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case ARG_BLOCK_SIZE:
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enc->blocksize = g_value_get_int (value);
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break;
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case ARG_LAYOUT:
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enc->layout = g_value_get_enum (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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adpcmenc_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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ADPCMEnc *enc = GST_ADPCM_ENC (object);
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switch (prop_id) {
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case ARG_BLOCK_SIZE:
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g_value_set_int (value, enc->blocksize);
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break;
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case ARG_LAYOUT:
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g_value_set_enum (value, enc->layout);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static guint8
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adpcmenc_encode_ima_sample (gint16 sample, gint16 * prev_sample,
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guint8 * stepindex)
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{
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const int NEGATIVE_SIGN_BIT = 0x8;
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int diff, vpdiff, mask, step;
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int bytecode = 0x0;
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diff = sample - *prev_sample;
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step = ima_step_size[*stepindex];
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vpdiff = step >> 3;
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if (diff < 0) {
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diff = -diff;
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bytecode = NEGATIVE_SIGN_BIT;
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}
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mask = 0x4;
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while (mask > 0) {
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if (diff >= step) {
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bytecode |= mask;
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diff -= step;
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vpdiff += step;
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}
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step >>= 1;
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mask >>= 1;
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}
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if (bytecode & 8) {
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vpdiff = -vpdiff;
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}
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*prev_sample = CLAMP (*prev_sample + vpdiff, G_MININT16, G_MAXINT16);
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*stepindex = CLAMP (*stepindex + ima_indx_adjust[bytecode], 0, 88);
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return bytecode;
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}
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static gboolean
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adpcmenc_encode_ima_block (ADPCMEnc * enc, gint16 * samples, guint8 * outbuf)
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{
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const int HEADER_SIZE = 4;
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gint16 prev_sample[2] = { 0, 0 };
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guint32 write_pos = 0;
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guint32 read_pos = 0;
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guint8 channel = 0;
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/* Write a header for each channel.
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* The header consists of a sixteen-bit predicted sound value,
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* and an eight bit step_index, carried forward from any previous block.
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* These allow seeking within the file.
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*/
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for (channel = 0; channel < enc->channels; channel++) {
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write_pos = channel * HEADER_SIZE;
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outbuf[write_pos + 0] = (samples[channel] & 0xFF);
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outbuf[write_pos + 1] = (samples[channel] >> 8) & 0xFF;
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outbuf[write_pos + 2] = enc->step_index[channel];
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outbuf[write_pos + 3] = 0;
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prev_sample[channel] = samples[channel];
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}
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/* raw-audio looks like this for a stereo stream:
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* [ L, R, L, R, L, R ... ]
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* encoded audio is in eight-sample blocks, two samples to a byte thusly:
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* [ LL, LL, LL, LL, RR, RR, RR, RR ... ]
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*/
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write_pos = HEADER_SIZE * enc->channels;
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read_pos = enc->channels; /* the first sample is in the header. */
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while (write_pos < enc->blocksize) {
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gint8 CHANNEL_CHUNK_SIZE = 8;
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for (channel = 0; channel < enc->channels; channel++) {
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/* convert eight samples (four bytes) per channel, then swap */
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guint32 channel_chunk_base = read_pos + channel;
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gint8 chunk;
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for (chunk = 0; chunk < CHANNEL_CHUNK_SIZE; chunk++) {
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guint8 packed_byte = 0, encoded_sample;
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encoded_sample =
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adpcmenc_encode_ima_sample (samples[channel_chunk_base +
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(chunk * enc->channels)], &prev_sample[channel],
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&enc->step_index[channel]);
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packed_byte |= encoded_sample & 0x0F;
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chunk++;
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encoded_sample =
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adpcmenc_encode_ima_sample (samples[channel_chunk_base +
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(chunk * enc->channels)], &prev_sample[channel],
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&enc->step_index[channel]);
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packed_byte |= encoded_sample << 4 & 0xF0;
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outbuf[write_pos++] = packed_byte;
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}
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}
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/* advance to the next block of 8 samples per channel */
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read_pos += CHANNEL_CHUNK_SIZE * enc->channels;
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if (read_pos > enc->samples_per_block * enc->channels) {
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GST_LOG ("Ran past the end. (Reading %i of %i.)", read_pos,
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enc->samples_per_block);
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}
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}
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return TRUE;
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}
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static GstFlowReturn
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adpcmenc_encode_block (ADPCMEnc * enc, gint16 * samples, int blocksize)
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{
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gboolean res;
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GstBuffer *outbuf = NULL;
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if (enc->layout == LAYOUT_ADPCM_DVI) {
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outbuf = gst_buffer_new_and_alloc (enc->blocksize);
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res = adpcmenc_encode_ima_block (enc, samples, GST_BUFFER_DATA (outbuf));
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} else {
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GST_WARNING_OBJECT (enc, "Unknown layout");
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return GST_FLOW_ERROR;
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}
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if (!res) {
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gst_buffer_unref (outbuf);
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GST_WARNING_OBJECT (enc, "Encode of block failed");
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return GST_FLOW_ERROR;
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}
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gst_buffer_set_caps (outbuf, enc->output_caps);
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GST_BUFFER_TIMESTAMP (outbuf) = enc->timestamp;
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enc->out_samples += enc->samples_per_block;
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enc->timestamp = enc->base_timestamp +
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gst_util_uint64_scale_int (enc->out_samples, GST_SECOND, enc->rate);
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GST_BUFFER_DURATION (outbuf) = enc->timestamp - GST_BUFFER_TIMESTAMP (outbuf);
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return gst_pad_push (enc->srcpad, outbuf);
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}
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static GstFlowReturn
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adpcmenc_chain (GstPad * pad, GstBuffer * buf)
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{
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ADPCMEnc *enc = (ADPCMEnc *) gst_pad_get_parent (pad);
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GstFlowReturn ret = GST_FLOW_OK;
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gint16 *samples;
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GstBuffer *databuf = NULL;
|
||||
int input_bytes_per_block;
|
||||
const int BYTES_PER_SAMPLE = 2;
|
||||
|
||||
if (enc->base_timestamp == GST_CLOCK_TIME_NONE) {
|
||||
enc->base_timestamp = GST_BUFFER_TIMESTAMP (buf);
|
||||
if (enc->base_timestamp == GST_CLOCK_TIME_NONE)
|
||||
enc->base_timestamp = 0;
|
||||
enc->timestamp = enc->base_timestamp;
|
||||
}
|
||||
|
||||
gst_adapter_push (enc->adapter, buf);
|
||||
|
||||
input_bytes_per_block =
|
||||
enc->samples_per_block * BYTES_PER_SAMPLE * enc->channels;
|
||||
|
||||
while (gst_adapter_available (enc->adapter) >= input_bytes_per_block) {
|
||||
databuf = gst_adapter_take_buffer (enc->adapter, input_bytes_per_block);
|
||||
samples = (gint16 *) GST_BUFFER_DATA (databuf);
|
||||
ret = adpcmenc_encode_block (enc, samples, enc->blocksize);
|
||||
gst_buffer_unref (databuf);
|
||||
if (ret != GST_FLOW_OK)
|
||||
goto done;
|
||||
}
|
||||
|
||||
done:
|
||||
gst_object_unref (enc);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
adpcmenc_sink_event (GstPad * pad, GstEvent * event)
|
||||
{
|
||||
ADPCMEnc *enc = (ADPCMEnc *) gst_pad_get_parent (pad);
|
||||
gboolean res;
|
||||
switch (GST_EVENT_TYPE (event)) {
|
||||
case GST_EVENT_FLUSH_STOP:
|
||||
enc->out_samples = 0;
|
||||
enc->timestamp = GST_CLOCK_TIME_NONE;
|
||||
enc->base_timestamp = GST_CLOCK_TIME_NONE;
|
||||
gst_adapter_clear (enc->adapter);
|
||||
/* Fall through */
|
||||
default:
|
||||
res = gst_pad_push_event (enc->srcpad, event);
|
||||
break;
|
||||
}
|
||||
gst_object_unref (enc);
|
||||
return res;
|
||||
}
|
||||
|
||||
static GstStateChangeReturn
|
||||
adpcmenc_change_state (GstElement * element, GstStateChange transition)
|
||||
{
|
||||
GstStateChangeReturn ret;
|
||||
ADPCMEnc *enc = (ADPCMEnc *) element;
|
||||
|
||||
switch (transition) {
|
||||
case GST_STATE_CHANGE_NULL_TO_READY:
|
||||
break;
|
||||
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
||||
break;
|
||||
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
||||
|
||||
switch (transition) {
|
||||
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
||||
break;
|
||||
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
||||
adpcmenc_teardown (enc);
|
||||
break;
|
||||
case GST_STATE_CHANGE_READY_TO_NULL:
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void
|
||||
adpcmenc_dispose (GObject * obj)
|
||||
{
|
||||
G_OBJECT_CLASS (parent_class)->dispose (obj);
|
||||
}
|
||||
|
||||
static void
|
||||
adpcmenc_init (ADPCMEnc * enc, ADPCMEncClass * klass)
|
||||
{
|
||||
enc->sinkpad =
|
||||
gst_pad_new_from_static_template (&adpcmenc_sink_template, "sink");
|
||||
gst_pad_set_setcaps_function (enc->sinkpad,
|
||||
GST_DEBUG_FUNCPTR (adpcmenc_sink_setcaps));
|
||||
gst_pad_set_chain_function (enc->sinkpad, GST_DEBUG_FUNCPTR (adpcmenc_chain));
|
||||
gst_pad_set_event_function (enc->sinkpad,
|
||||
GST_DEBUG_FUNCPTR (adpcmenc_sink_event));
|
||||
gst_element_add_pad (GST_ELEMENT (enc), enc->sinkpad);
|
||||
|
||||
enc->srcpad =
|
||||
gst_pad_new_from_static_template (&adpcmenc_src_template, "src");
|
||||
gst_element_add_pad (GST_ELEMENT (enc), enc->srcpad);
|
||||
|
||||
/* Set defaults. */
|
||||
enc->blocksize = DEFAULT_ADPCM_BLOCK_SIZE;
|
||||
enc->layout = DEFAULT_ADPCM_LAYOUT;
|
||||
}
|
||||
|
||||
static void
|
||||
adpcmenc_class_init (ADPCMEncClass * klass)
|
||||
{
|
||||
GObjectClass *gobjectclass = (GObjectClass *) klass;
|
||||
GstElementClass *gstelement_class = (GstElementClass *) klass;
|
||||
|
||||
gobjectclass->set_property = adpcmenc_set_property;
|
||||
gobjectclass->get_property = adpcmenc_get_property;
|
||||
|
||||
g_object_class_install_property (gobjectclass, ARG_LAYOUT,
|
||||
g_param_spec_enum ("layout", "Layout",
|
||||
"Layout for output stream",
|
||||
GST_TYPE_ADPCMENC_LAYOUT, DEFAULT_ADPCM_LAYOUT,
|
||||
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
||||
|
||||
g_object_class_install_property (gobjectclass, ARG_BLOCK_SIZE,
|
||||
g_param_spec_int ("blockalign", "Block Align",
|
||||
"Block size for output stream",
|
||||
MIN_ADPCM_BLOCK_SIZE, MAX_ADPCM_BLOCK_SIZE,
|
||||
DEFAULT_ADPCM_BLOCK_SIZE,
|
||||
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
||||
|
||||
gobjectclass->dispose = adpcmenc_dispose;
|
||||
gstelement_class->change_state = adpcmenc_change_state;
|
||||
} static void
|
||||
|
||||
adpcmenc_base_init (gpointer klass)
|
||||
{
|
||||
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
|
||||
gst_element_class_add_pad_template (element_class,
|
||||
gst_static_pad_template_get (&adpcmenc_sink_template));
|
||||
gst_element_class_add_pad_template (element_class,
|
||||
gst_static_pad_template_get (&adpcmenc_src_template));
|
||||
gst_element_class_set_details (element_class, &adpcmenc_details);
|
||||
}
|
||||
|
||||
static gboolean
|
||||
plugin_init (GstPlugin * plugin)
|
||||
{
|
||||
GST_DEBUG_CATEGORY_INIT (adpcmenc_debug, "adpcmenc", 0, "ADPCM Encoders");
|
||||
if (!gst_element_register (plugin, "adpcmenc", GST_RANK_PRIMARY,
|
||||
GST_TYPE_ADPCM_ENC)) {
|
||||
return FALSE;
|
||||
}
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "adpcmenc",
|
||||
"ADPCM encoder", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME,
|
||||
GST_PACKAGE_ORIGIN);
|
||||
Loading…
Reference in a new issue