gstreamer/ext/openaptx/gstopenaptxdec.c

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/* GStreamer openaptx audio decoder
*
* Copyright (C) 2020 Igor V. Kovalenko <igor.v.kovalenko@gmail.com>
* Copyright (C) 2020 Thomas Weißschuh <thomas@t-8ch.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* SECTION:element-openaptxdec
* @title: openaptxdec
*
* This element decodes Bluetooth aptX or aptX-HD stream to raw S24LE integer stereo PCM audio.
* Accepts audio/aptx or audio/aptx-hd input streams.
*
* ## Example pipelines
* |[
* gst-launch-1.0 -v audiotestsrc ! avenc_aptx ! openaptxdec ! audioconvert ! autoaudiosink
* ]| Decode a sine wave encoded with AV encoder and listen to result.
* |[
* gst-launch-1.0 -v audiotestsrc ! avenc_aptx ! openaptxdec autosync=0 ! audioconvert ! autoaudiosink
* ]| Decode a sine wave encoded with AV encoder and listen to result, stream autosync disabled.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gstopenaptxdec.h"
#include "openaptx-plugin.h"
enum
{
PROP_0,
PROP_AUTOSYNC
};
GST_DEBUG_CATEGORY_STATIC (openaptx_dec_debug);
#define GST_CAT_DEFAULT openaptx_dec_debug
#define parent_class gst_openaptx_dec_parent_class
G_DEFINE_TYPE (GstOpenaptxDec, gst_openaptx_dec, GST_TYPE_AUDIO_DECODER);
GST_ELEMENT_REGISTER_DEFINE (openaptxdec, "openaptxdec", GST_RANK_NONE,
GST_TYPE_OPENAPTX_DEC);
static GstStaticPadTemplate openaptx_dec_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/aptx-hd, channels = 2, rate = [ 1, MAX ]; "
"audio/aptx, channels = 2, rate = [ 1, MAX ]"));
static GstStaticPadTemplate openaptx_dec_src_factory =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw, format = S24LE,"
" rate = [ 1, MAX ], channels = 2, layout = interleaved"));
static GstFlowReturn
gst_openaptx_dec_handle_frame (GstAudioDecoder * audio_dec, GstBuffer * buffer)
{
GstOpenaptxDec *dec = GST_OPENAPTX_DEC (audio_dec);
GstMapInfo out_map;
GstBuffer *outbuf = NULL;
GstFlowReturn ret;
guint num_frames;
gsize frame_len, output_size;
gssize input_size, processed = 0;
gsize written = 0;
gint synced;
gsize dropped;
/* no fancy draining */
if (G_UNLIKELY (!buffer))
input_size = 0;
else
input_size = gst_buffer_get_size (buffer);
frame_len = aptx_frame_size (dec->hd);
if (!dec->autosync) {
/* we assume all frames are of the same size, this is implied by the
* input caps applying to the whole input buffer, and the parser should
* also have made sure of that */
if (G_UNLIKELY (input_size % frame_len != 0))
goto mixed_frames;
}
num_frames = input_size / frame_len;
/* need one extra frame if autosync is enabled */
if (dec->autosync)
++num_frames;
output_size = num_frames * APTX_SAMPLES_PER_FRAME * APTX_SAMPLE_SIZE;
outbuf = gst_audio_decoder_allocate_output_buffer (audio_dec, output_size);
if (outbuf == NULL)
goto no_output_buffer;
if (!gst_buffer_map (outbuf, &out_map, GST_MAP_WRITE)) {
gst_buffer_replace (&outbuf, NULL);
goto no_output_buffer_map;
}
if (G_LIKELY (buffer)) {
GstMapInfo in_map;
if (!gst_buffer_map (buffer, &in_map, GST_MAP_READ)) {
gst_buffer_unmap (outbuf, &out_map);
gst_buffer_replace (&outbuf, NULL);
goto map_failed;
}
if (dec->autosync) {
processed = aptx_decode_sync (dec->aptx_c, in_map.data, in_map.size,
out_map.data, output_size, &written, &synced, &dropped);
} else {
processed = aptx_decode (dec->aptx_c, in_map.data, in_map.size,
out_map.data, out_map.size, &written);
}
gst_buffer_unmap (buffer, &in_map);
} else {
if (dec->autosync) {
dropped = aptx_decode_sync_finish (dec->aptx_c);
synced = 1;
}
}
if (dec->autosync) {
if (!synced) {
GST_WARNING_OBJECT (dec, "%s stream is not synchronized",
aptx_name (dec->hd));
}
if (dropped) {
GST_WARNING_OBJECT (dec,
"%s decoder dropped %" G_GSIZE_FORMAT " bytes from stream",
aptx_name (dec->hd), dropped);
}
}
if (processed != input_size) {
GST_WARNING_OBJECT (dec,
"%s decoding error, processed = %" G_GSSIZE_FORMAT ", "
"written = %" G_GSSIZE_FORMAT ", input size = %" G_GSIZE_FORMAT,
aptx_name (dec->hd), processed, written, input_size);
}
gst_buffer_unmap (outbuf, &out_map);
GST_LOG_OBJECT (dec, "%s written = %" G_GSSIZE_FORMAT,
aptx_name (dec->hd), written);
done:
if (G_LIKELY (outbuf)) {
if (G_LIKELY (written > 0))
gst_buffer_set_size (outbuf, written);
else
gst_buffer_replace (&outbuf, NULL);
}
ret = gst_audio_decoder_finish_frame (audio_dec, outbuf, 1);
if (G_UNLIKELY (!buffer))
ret = GST_FLOW_EOS;
return ret;
/* ERRORS */
mixed_frames:
{
GST_WARNING_OBJECT (dec, "inconsistent input data/frames, skipping");
goto done;
}
no_output_buffer_map:
{
GST_ELEMENT_ERROR (dec, RESOURCE, FAILED,
("Could not map output buffer"),
("Failed to map allocated output buffer for write access."));
return GST_FLOW_ERROR;
}
no_output_buffer:
{
GST_ELEMENT_ERROR (dec, RESOURCE, FAILED,
("Could not allocate output buffer"),
("Audio decoder failed to allocate output buffer to hold an audio frame."));
return GST_FLOW_ERROR;
}
map_failed:
{
GST_ELEMENT_ERROR (dec, RESOURCE, FAILED,
("Could not map input buffer"),
("Failed to map incoming buffer for read access."));
return GST_FLOW_ERROR;
}
}
static gboolean
gst_openaptx_dec_set_format (GstAudioDecoder * audio_dec, GstCaps * caps)
{
GstOpenaptxDec *dec = GST_OPENAPTX_DEC (audio_dec);
GstAudioInfo info;
GstStructure *s;
gint rate;
s = gst_caps_get_structure (caps, 0);
gst_structure_get_int (s, "rate", &rate);
/* let's see what is in the output caps */
dec->hd = gst_structure_has_name (s, "audio/aptx-hd");
/* reinitialize codec */
if (dec->aptx_c)
aptx_finish (dec->aptx_c);
GST_INFO_OBJECT (dec, "Initialize %s codec", aptx_name (dec->hd));
dec->aptx_c = aptx_init (dec->hd);
/* set up output format */
gst_audio_info_init (&info);
gst_audio_info_set_format (&info, GST_AUDIO_FORMAT_S24LE,
rate, APTX_NUM_CHANNELS, NULL);
gst_audio_decoder_set_output_format (audio_dec, &info);
return TRUE;
}
static void
gst_openaptx_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstOpenaptxDec *dec = GST_OPENAPTX_DEC (object);
switch (prop_id) {
case PROP_AUTOSYNC:
dec->autosync = g_value_get_boolean (value);
break;
default:
break;
}
}
static void
gst_openaptx_dec_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstOpenaptxDec *dec = GST_OPENAPTX_DEC (object);
switch (prop_id) {
case PROP_AUTOSYNC:{
g_value_set_boolean (value, dec->autosync);
break;
}
default:{
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
}
static gboolean
gst_openaptx_dec_start (GstAudioDecoder * audio_dec)
{
return TRUE;
}
static gboolean
gst_openaptx_dec_stop (GstAudioDecoder * audio_dec)
{
GstOpenaptxDec *dec = GST_OPENAPTX_DEC (audio_dec);
GST_INFO_OBJECT (dec, "Finish openaptx codec");
if (dec->aptx_c) {
aptx_finish (dec->aptx_c);
dec->aptx_c = NULL;
}
return TRUE;
}
static void
gst_openaptx_dec_class_init (GstOpenaptxDecClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstAudioDecoderClass *base_class = GST_AUDIO_DECODER_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_openaptx_dec_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_openaptx_dec_get_property);
g_object_class_install_property (gobject_class, PROP_AUTOSYNC,
g_param_spec_boolean ("autosync", "Auto sync",
"Gracefully handle partially corrupted stream in which some bytes are missing",
APTX_AUTOSYNC_DEFAULT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
base_class->start = GST_DEBUG_FUNCPTR (gst_openaptx_dec_start);
base_class->stop = GST_DEBUG_FUNCPTR (gst_openaptx_dec_stop);
base_class->set_format = GST_DEBUG_FUNCPTR (gst_openaptx_dec_set_format);
base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_openaptx_dec_handle_frame);
gst_element_class_add_static_pad_template (element_class,
&openaptx_dec_sink_factory);
gst_element_class_add_static_pad_template (element_class,
&openaptx_dec_src_factory);
gst_element_class_set_static_metadata (element_class,
"Bluetooth aptX/aptX-HD audio decoder using libopenaptx",
"Codec/Decoder/Audio",
"Decode an aptX or aptX-HD audio stream using libopenaptx",
"Igor V. Kovalenko <igor.v.kovalenko@gmail.com>, "
"Thomas Weißschuh <thomas@t-8ch.de>");
GST_DEBUG_CATEGORY_INIT (openaptx_dec_debug, "openaptxdec", 0,
"openaptx decoding element");
}
static void
gst_openaptx_dec_init (GstOpenaptxDec * dec)
{
gst_audio_decoder_set_needs_format (GST_AUDIO_DECODER (dec), TRUE);
gst_audio_decoder_set_use_default_pad_acceptcaps (GST_AUDIO_DECODER_CAST
(dec), TRUE);
GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_DECODER_SINK_PAD (dec));
dec->aptx_c = NULL;
dec->autosync = APTX_AUTOSYNC_DEFAULT;
}