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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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344 lines
9.9 KiB
C
344 lines
9.9 KiB
C
/* GStreamer openaptx audio decoder
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*
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* Copyright (C) 2020 Igor V. Kovalenko <igor.v.kovalenko@gmail.com>
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* Copyright (C) 2020 Thomas Weißschuh <thomas@t-8ch.de>
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/**
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* SECTION:element-openaptxdec
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* @title: openaptxdec
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*
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* This element decodes Bluetooth aptX or aptX-HD stream to raw S24LE integer stereo PCM audio.
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* Accepts audio/aptx or audio/aptx-hd input streams.
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*
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* ## Example pipelines
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* |[
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* gst-launch-1.0 -v audiotestsrc ! avenc_aptx ! openaptxdec ! audioconvert ! autoaudiosink
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* ]| Decode a sine wave encoded with AV encoder and listen to result.
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* |[
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* gst-launch-1.0 -v audiotestsrc ! avenc_aptx ! openaptxdec autosync=0 ! audioconvert ! autoaudiosink
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* ]| Decode a sine wave encoded with AV encoder and listen to result, stream autosync disabled.
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*
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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 "gstopenaptxdec.h"
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#include "openaptx-plugin.h"
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enum
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{
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PROP_0,
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PROP_AUTOSYNC
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};
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GST_DEBUG_CATEGORY_STATIC (openaptx_dec_debug);
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#define GST_CAT_DEFAULT openaptx_dec_debug
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#define parent_class gst_openaptx_dec_parent_class
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G_DEFINE_TYPE (GstOpenaptxDec, gst_openaptx_dec, GST_TYPE_AUDIO_DECODER);
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GST_ELEMENT_REGISTER_DEFINE (openaptxdec, "openaptxdec", GST_RANK_NONE,
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GST_TYPE_OPENAPTX_DEC);
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static GstStaticPadTemplate openaptx_dec_sink_factory =
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GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/aptx-hd, channels = 2, rate = [ 1, MAX ]; "
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"audio/aptx, channels = 2, rate = [ 1, MAX ]"));
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static GstStaticPadTemplate openaptx_dec_src_factory =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw, format = S24LE,"
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" rate = [ 1, MAX ], channels = 2, layout = interleaved"));
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static GstFlowReturn
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gst_openaptx_dec_handle_frame (GstAudioDecoder * audio_dec, GstBuffer * buffer)
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{
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GstOpenaptxDec *dec = GST_OPENAPTX_DEC (audio_dec);
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GstMapInfo out_map;
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GstBuffer *outbuf = NULL;
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GstFlowReturn ret;
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guint num_frames;
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gsize frame_len, output_size;
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gssize input_size, processed = 0;
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gsize written = 0;
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gint synced;
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gsize dropped;
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/* no fancy draining */
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if (G_UNLIKELY (!buffer))
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input_size = 0;
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else
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input_size = gst_buffer_get_size (buffer);
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frame_len = aptx_frame_size (dec->hd);
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if (!dec->autosync) {
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/* we assume all frames are of the same size, this is implied by the
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* input caps applying to the whole input buffer, and the parser should
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* also have made sure of that */
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if (G_UNLIKELY (input_size % frame_len != 0))
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goto mixed_frames;
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}
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num_frames = input_size / frame_len;
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/* need one extra frame if autosync is enabled */
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if (dec->autosync)
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++num_frames;
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output_size = num_frames * APTX_SAMPLES_PER_FRAME * APTX_SAMPLE_SIZE;
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outbuf = gst_audio_decoder_allocate_output_buffer (audio_dec, output_size);
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if (outbuf == NULL)
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goto no_output_buffer;
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if (!gst_buffer_map (outbuf, &out_map, GST_MAP_WRITE)) {
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gst_buffer_replace (&outbuf, NULL);
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goto no_output_buffer_map;
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}
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if (G_LIKELY (buffer)) {
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GstMapInfo in_map;
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if (!gst_buffer_map (buffer, &in_map, GST_MAP_READ)) {
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gst_buffer_unmap (outbuf, &out_map);
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gst_buffer_replace (&outbuf, NULL);
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goto map_failed;
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}
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if (dec->autosync) {
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processed = aptx_decode_sync (dec->aptx_c, in_map.data, in_map.size,
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out_map.data, output_size, &written, &synced, &dropped);
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} else {
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processed = aptx_decode (dec->aptx_c, in_map.data, in_map.size,
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out_map.data, out_map.size, &written);
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}
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gst_buffer_unmap (buffer, &in_map);
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} else {
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if (dec->autosync) {
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dropped = aptx_decode_sync_finish (dec->aptx_c);
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synced = 1;
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}
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}
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if (dec->autosync) {
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if (!synced) {
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GST_WARNING_OBJECT (dec, "%s stream is not synchronized",
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aptx_name (dec->hd));
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}
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if (dropped) {
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GST_WARNING_OBJECT (dec,
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"%s decoder dropped %" G_GSIZE_FORMAT " bytes from stream",
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aptx_name (dec->hd), dropped);
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}
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}
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if (processed != input_size) {
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GST_WARNING_OBJECT (dec,
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"%s decoding error, processed = %" G_GSSIZE_FORMAT ", "
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"written = %" G_GSSIZE_FORMAT ", input size = %" G_GSIZE_FORMAT,
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aptx_name (dec->hd), processed, written, input_size);
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}
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gst_buffer_unmap (outbuf, &out_map);
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GST_LOG_OBJECT (dec, "%s written = %" G_GSSIZE_FORMAT,
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aptx_name (dec->hd), written);
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done:
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if (G_LIKELY (outbuf)) {
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if (G_LIKELY (written > 0))
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gst_buffer_set_size (outbuf, written);
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else
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gst_buffer_replace (&outbuf, NULL);
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}
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ret = gst_audio_decoder_finish_frame (audio_dec, outbuf, 1);
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if (G_UNLIKELY (!buffer))
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ret = GST_FLOW_EOS;
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return ret;
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/* ERRORS */
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mixed_frames:
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{
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GST_WARNING_OBJECT (dec, "inconsistent input data/frames, skipping");
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goto done;
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}
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no_output_buffer_map:
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{
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GST_ELEMENT_ERROR (dec, RESOURCE, FAILED,
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("Could not map output buffer"),
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("Failed to map allocated output buffer for write access."));
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return GST_FLOW_ERROR;
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}
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no_output_buffer:
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{
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GST_ELEMENT_ERROR (dec, RESOURCE, FAILED,
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("Could not allocate output buffer"),
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("Audio decoder failed to allocate output buffer to hold an audio frame."));
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return GST_FLOW_ERROR;
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}
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map_failed:
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{
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GST_ELEMENT_ERROR (dec, RESOURCE, FAILED,
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("Could not map input buffer"),
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("Failed to map incoming buffer for read access."));
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return GST_FLOW_ERROR;
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}
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}
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static gboolean
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gst_openaptx_dec_set_format (GstAudioDecoder * audio_dec, GstCaps * caps)
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{
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GstOpenaptxDec *dec = GST_OPENAPTX_DEC (audio_dec);
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GstAudioInfo info;
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GstStructure *s;
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gint rate;
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s = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (s, "rate", &rate);
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/* let's see what is in the output caps */
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dec->hd = gst_structure_has_name (s, "audio/aptx-hd");
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/* reinitialize codec */
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if (dec->aptx_c)
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aptx_finish (dec->aptx_c);
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GST_INFO_OBJECT (dec, "Initialize %s codec", aptx_name (dec->hd));
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dec->aptx_c = aptx_init (dec->hd);
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/* set up output format */
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gst_audio_info_init (&info);
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gst_audio_info_set_format (&info, GST_AUDIO_FORMAT_S24LE,
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rate, APTX_NUM_CHANNELS, NULL);
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gst_audio_decoder_set_output_format (audio_dec, &info);
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return TRUE;
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}
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static void
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gst_openaptx_dec_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstOpenaptxDec *dec = GST_OPENAPTX_DEC (object);
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switch (prop_id) {
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case PROP_AUTOSYNC:
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dec->autosync = g_value_get_boolean (value);
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break;
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default:
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break;
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}
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}
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static void
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gst_openaptx_dec_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstOpenaptxDec *dec = GST_OPENAPTX_DEC (object);
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switch (prop_id) {
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case PROP_AUTOSYNC:{
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g_value_set_boolean (value, dec->autosync);
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break;
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}
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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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}
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static gboolean
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gst_openaptx_dec_start (GstAudioDecoder * audio_dec)
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{
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return TRUE;
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}
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static gboolean
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gst_openaptx_dec_stop (GstAudioDecoder * audio_dec)
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{
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GstOpenaptxDec *dec = GST_OPENAPTX_DEC (audio_dec);
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GST_INFO_OBJECT (dec, "Finish openaptx codec");
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if (dec->aptx_c) {
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aptx_finish (dec->aptx_c);
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dec->aptx_c = NULL;
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}
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return TRUE;
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}
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static void
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gst_openaptx_dec_class_init (GstOpenaptxDecClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstAudioDecoderClass *base_class = GST_AUDIO_DECODER_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->set_property =
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GST_DEBUG_FUNCPTR (gst_openaptx_dec_set_property);
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gobject_class->get_property =
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GST_DEBUG_FUNCPTR (gst_openaptx_dec_get_property);
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g_object_class_install_property (gobject_class, PROP_AUTOSYNC,
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g_param_spec_boolean ("autosync", "Auto sync",
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"Gracefully handle partially corrupted stream in which some bytes are missing",
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APTX_AUTOSYNC_DEFAULT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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base_class->start = GST_DEBUG_FUNCPTR (gst_openaptx_dec_start);
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base_class->stop = GST_DEBUG_FUNCPTR (gst_openaptx_dec_stop);
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base_class->set_format = GST_DEBUG_FUNCPTR (gst_openaptx_dec_set_format);
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base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_openaptx_dec_handle_frame);
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gst_element_class_add_static_pad_template (element_class,
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&openaptx_dec_sink_factory);
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gst_element_class_add_static_pad_template (element_class,
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&openaptx_dec_src_factory);
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gst_element_class_set_static_metadata (element_class,
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"Bluetooth aptX/aptX-HD audio decoder using libopenaptx",
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"Codec/Decoder/Audio",
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"Decode an aptX or aptX-HD audio stream using libopenaptx",
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"Igor V. Kovalenko <igor.v.kovalenko@gmail.com>, "
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"Thomas Weißschuh <thomas@t-8ch.de>");
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GST_DEBUG_CATEGORY_INIT (openaptx_dec_debug, "openaptxdec", 0,
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"openaptx decoding element");
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}
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static void
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gst_openaptx_dec_init (GstOpenaptxDec * dec)
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{
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gst_audio_decoder_set_needs_format (GST_AUDIO_DECODER (dec), TRUE);
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gst_audio_decoder_set_use_default_pad_acceptcaps (GST_AUDIO_DECODER_CAST
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(dec), TRUE);
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GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_DECODER_SINK_PAD (dec));
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dec->aptx_c = NULL;
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dec->autosync = APTX_AUTOSYNC_DEFAULT;
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}
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