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247 lines
7.5 KiB
C
247 lines
7.5 KiB
C
/* GStreamer SBC audio decoder
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*
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* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
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* Copyright (C) 2013 Tim-Philipp Müller <tim centricular net>
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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-sbdec
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* @title: sbdec
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*
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* This element decodes a Bluetooth SBC audio streams to raw integer PCM audio
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*
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* ## Example pipelines
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* |[
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* gst-launch-1.0 -v filesrc location=audio.sbc ! sbcparse ! sbcdec ! audioconvert ! audioresample ! autoaudiosink
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* ]| Decode a raw SBC file.
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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 <string.h>
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#include "gstsbcdec.h"
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/* FIXME: where does this come from? how is it derived? */
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#define BUF_SIZE 8192
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GST_DEBUG_CATEGORY_STATIC (sbc_dec_debug);
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#define GST_CAT_DEFAULT sbc_dec_debug
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#define parent_class gst_sbc_dec_parent_class
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G_DEFINE_TYPE (GstSbcDec, gst_sbc_dec, GST_TYPE_AUDIO_DECODER);
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GST_ELEMENT_REGISTER_DEFINE (sbcdec, "sbcdec", GST_RANK_PRIMARY,
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GST_TYPE_SBC_DEC);
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static GstStaticPadTemplate sbc_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/x-sbc, channels = (int) [ 1, 2 ], "
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"rate = (int) { 16000, 32000, 44100, 48000 }, "
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"parsed = (boolean) true"));
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static GstStaticPadTemplate sbc_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=" GST_AUDIO_NE (S16) ", "
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"rate = (int) { 16000, 32000, 44100, 48000 }, "
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"channels = (int) [ 1, 2 ], layout=interleaved"));
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static GstFlowReturn
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gst_sbc_dec_handle_frame (GstAudioDecoder * audio_dec, GstBuffer * buf)
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{
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GstSbcDec *dec = GST_SBC_DEC (audio_dec);
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GstBuffer *outbuf = NULL;
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GstMapInfo out_map;
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GstMapInfo in_map;
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gsize output_size;
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guint num_frames, i;
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/* no fancy draining */
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if (G_UNLIKELY (buf == NULL))
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return GST_FLOW_OK;
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gst_buffer_map (buf, &in_map, GST_MAP_READ);
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if (G_UNLIKELY (in_map.size == 0))
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goto done;
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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 (in_map.size % dec->frame_len != 0))
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goto mixed_frames;
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num_frames = in_map.size / dec->frame_len;
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output_size = num_frames * dec->samples_per_frame * sizeof (gint16);
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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_buffer;
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gst_buffer_map (outbuf, &out_map, GST_MAP_WRITE);
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for (i = 0; i < num_frames; ++i) {
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gssize ret;
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gsize written;
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ret = sbc_decode (&dec->sbc, in_map.data + (i * dec->frame_len),
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dec->frame_len, out_map.data + (i * dec->samples_per_frame * 2),
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dec->samples_per_frame * 2, &written);
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if (ret <= 0 || written != (dec->samples_per_frame * 2)) {
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GST_WARNING_OBJECT (dec, "decoding error, ret = %" G_GSSIZE_FORMAT ", "
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"written = %" G_GSSIZE_FORMAT, ret, written);
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break;
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}
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}
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gst_buffer_unmap (outbuf, &out_map);
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if (i > 0)
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gst_buffer_set_size (outbuf, i * dec->samples_per_frame * 2);
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else
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gst_buffer_replace (&outbuf, NULL);
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done:
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gst_buffer_unmap (buf, &in_map);
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return gst_audio_decoder_finish_frame (audio_dec, outbuf, 1);
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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_buffer:
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{
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GST_ERROR_OBJECT (dec, "could not allocate output buffer");
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goto done;
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}
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}
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static gboolean
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gst_sbc_dec_set_format (GstAudioDecoder * audio_dec, GstCaps * caps)
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{
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GstSbcDec *dec = GST_SBC_DEC (audio_dec);
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const gchar *channel_mode;
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GstAudioInfo info;
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GstStructure *s;
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gint channels, rate, subbands, blocks, bitpool;
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s = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (s, "channels", &channels);
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gst_structure_get_int (s, "rate", &rate);
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/* save input format */
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channel_mode = gst_structure_get_string (s, "channel-mode");
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if (channel_mode == NULL ||
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!gst_structure_get_int (s, "subbands", &subbands) ||
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!gst_structure_get_int (s, "blocks", &blocks) ||
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!gst_structure_get_int (s, "bitpool", &bitpool))
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return FALSE;
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if (strcmp (channel_mode, "mono") == 0) {
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dec->frame_len = 4 + (subbands * 1) / 2 + ((blocks * 1 * bitpool) + 7) / 8;
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} else if (strcmp (channel_mode, "dual") == 0) {
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dec->frame_len = 4 + (subbands * 2) / 2 + ((blocks * 2 * bitpool) + 7) / 8;
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} else if (strcmp (channel_mode, "stereo") == 0) {
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dec->frame_len = 4 + (subbands * 2) / 2 + ((blocks * bitpool) + 7) / 8;
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} else if (strcmp (channel_mode, "joint") == 0) {
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dec->frame_len =
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4 + (subbands * 2) / 2 + ((subbands + blocks * bitpool) + 7) / 8;
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} else {
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return FALSE;
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}
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dec->samples_per_frame = channels * blocks * subbands;
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GST_INFO_OBJECT (dec, "frame len: %" G_GSIZE_FORMAT ", samples per frame "
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"%" G_GSIZE_FORMAT, dec->frame_len, dec->samples_per_frame);
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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_S16, rate, 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 gboolean
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gst_sbc_dec_start (GstAudioDecoder * dec)
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{
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GstSbcDec *sbcdec = GST_SBC_DEC (dec);
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GST_INFO_OBJECT (dec, "Setup subband codec");
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sbc_init (&sbcdec->sbc, 0);
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return TRUE;
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}
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static gboolean
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gst_sbc_dec_stop (GstAudioDecoder * dec)
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{
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GstSbcDec *sbcdec = GST_SBC_DEC (dec);
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GST_INFO_OBJECT (sbcdec, "Finish subband codec");
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sbc_finish (&sbcdec->sbc);
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sbcdec->samples_per_frame = 0;
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sbcdec->frame_len = 0;
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return TRUE;
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}
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static void
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gst_sbc_dec_class_init (GstSbcDecClass * klass)
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{
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GstAudioDecoderClass *audio_decoder_class = (GstAudioDecoderClass *) klass;
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GstElementClass *element_class = (GstElementClass *) klass;
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audio_decoder_class->start = GST_DEBUG_FUNCPTR (gst_sbc_dec_start);
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audio_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_sbc_dec_stop);
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audio_decoder_class->set_format = GST_DEBUG_FUNCPTR (gst_sbc_dec_set_format);
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audio_decoder_class->handle_frame =
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GST_DEBUG_FUNCPTR (gst_sbc_dec_handle_frame);
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gst_element_class_add_static_pad_template (element_class,
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&sbc_dec_sink_factory);
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gst_element_class_add_static_pad_template (element_class,
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&sbc_dec_src_factory);
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gst_element_class_set_static_metadata (element_class,
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"Bluetooth SBC audio decoder", "Codec/Decoder/Audio",
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"Decode an SBC audio stream", "Marcel Holtmann <marcel@holtmann.org>");
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GST_DEBUG_CATEGORY_INIT (sbc_dec_debug, "sbcdec", 0, "SBC decoding element");
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}
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static void
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gst_sbc_dec_init (GstSbcDec * 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->samples_per_frame = 0;
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dec->frame_len = 0;
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}
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