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Avoids useless check of downstream caps when handling an accept-caps query Elements: flacdec, speexdec, wavpackdec, mulawdec, alawdec
175 lines
4.9 KiB
C
175 lines
4.9 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-mulawdec
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*
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* This element decodes mulaw audio. Mulaw coding is also known as G.711.
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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 "mulaw-decode.h"
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#include "mulaw-conversion.h"
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extern GstStaticPadTemplate mulaw_dec_src_factory;
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extern GstStaticPadTemplate mulaw_dec_sink_factory;
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static gboolean gst_mulawdec_set_format (GstAudioDecoder * dec, GstCaps * caps);
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static GstFlowReturn gst_mulawdec_handle_frame (GstAudioDecoder * dec,
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GstBuffer * buffer);
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/* Stereo signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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PROP_0
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};
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#define gst_mulawdec_parent_class parent_class
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G_DEFINE_TYPE (GstMuLawDec, gst_mulawdec, GST_TYPE_AUDIO_DECODER);
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static gboolean
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gst_mulawdec_set_format (GstAudioDecoder * dec, GstCaps * caps)
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{
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GstMuLawDec *mulawdec = GST_MULAWDEC (dec);
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GstStructure *structure;
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int rate, channels;
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GstAudioInfo info;
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structure = gst_caps_get_structure (caps, 0);
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if (!structure) {
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GST_ERROR ("failed to get structure from caps");
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goto error_failed_get_structure;
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}
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if (!gst_structure_get_int (structure, "rate", &rate)) {
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GST_ERROR ("failed to find field rate in input caps");
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goto error_failed_find_rate;
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}
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if (!gst_structure_get_int (structure, "channels", &channels)) {
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GST_ERROR ("failed to find field channels in input caps");
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goto error_failed_find_channel;
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}
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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_DEBUG_OBJECT (mulawdec, "rate=%d, channels=%d", rate, channels);
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return gst_audio_decoder_set_output_format (dec, &info);
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error_failed_find_channel:
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error_failed_find_rate:
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error_failed_get_structure:
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return FALSE;
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}
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static GstFlowReturn
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gst_mulawdec_handle_frame (GstAudioDecoder * dec, GstBuffer * buffer)
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{
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GstMapInfo inmap, outmap;
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gint16 *linear_data;
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guint8 *mulaw_data;
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gsize mulaw_size, linear_size;
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GstBuffer *outbuf;
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if (!buffer) {
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return GST_FLOW_OK;
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}
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if (!gst_buffer_map (buffer, &inmap, GST_MAP_READ)) {
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GST_ERROR ("failed to map input buffer");
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goto error_failed_map_input_buffer;
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}
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mulaw_data = inmap.data;
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mulaw_size = inmap.size;
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linear_size = mulaw_size * 2;
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outbuf = gst_audio_decoder_allocate_output_buffer (dec, linear_size);
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if (!gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE)) {
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GST_ERROR ("failed to map input buffer");
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goto error_failed_map_output_buffer;
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}
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linear_data = (gint16 *) outmap.data;
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mulaw_decode (mulaw_data, linear_data, mulaw_size);
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gst_buffer_unmap (outbuf, &outmap);
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gst_buffer_unmap (buffer, &inmap);
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return gst_audio_decoder_finish_frame (dec, outbuf, -1);
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error_failed_map_output_buffer:
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gst_buffer_unref (outbuf);
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error_failed_map_input_buffer:
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return GST_FLOW_ERROR;
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}
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static gboolean
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gst_mulawdec_start (GstAudioDecoder * dec)
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{
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gst_audio_decoder_set_estimate_rate (dec, TRUE);
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return TRUE;
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}
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static void
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gst_mulawdec_class_init (GstMuLawDecClass * klass)
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{
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GstElementClass *element_class = (GstElementClass *) klass;
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GstAudioDecoderClass *audiodec_class = GST_AUDIO_DECODER_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&mulaw_dec_src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&mulaw_dec_sink_factory));
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audiodec_class->start = GST_DEBUG_FUNCPTR (gst_mulawdec_start);
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audiodec_class->set_format = GST_DEBUG_FUNCPTR (gst_mulawdec_set_format);
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audiodec_class->handle_frame = GST_DEBUG_FUNCPTR (gst_mulawdec_handle_frame);
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gst_element_class_set_static_metadata (element_class, "Mu Law audio decoder",
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"Codec/Decoder/Audio",
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"Convert 8bit mu law to 16bit PCM",
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"Zaheer Abbas Merali <zaheerabbas at merali dot org>");
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}
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static void
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gst_mulawdec_init (GstMuLawDec * mulawdec)
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{
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gst_audio_decoder_set_needs_format (GST_AUDIO_DECODER (mulawdec), TRUE);
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gst_audio_decoder_set_use_default_pad_acceptcaps (GST_AUDIO_DECODER_CAST
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(mulawdec), TRUE);
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GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_DECODER_SINK_PAD (mulawdec));
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}
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