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mpg123: add new libmpg123-based mp3 decoder plugin
Needs a bit of cleaning up. https://bugzilla.gnome.org/show_bug.cgi?id=681003
This commit is contained in:
Carlos Rafael Giani
Tim-Philipp Müller
commit
d7fa53d5d4
2 changed files with 693 additions and 0 deletions
631
ext/mpg123/gstmpg123audiodec.c
Normal file
631
ext/mpg123/gstmpg123audiodec.c
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@ -0,0 +1,631 @@
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/* MP3 decoding plugin for GStreamer using the mpg123 library
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* Copyright (C) 2012 Carlos Rafael Giani
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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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "gstmpg123audiodec.h"
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#include <stdlib.h>
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (mpg123_debug);
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#define GST_CAT_DEFAULT mpg123_debug
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/*
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* Omitted sample formats that mpg123 supports (or at least can support):
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* - 8bit integer signed
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* - 8bit integer unsigned
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* - a-law
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* - mu-law
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* - 64bit float
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*
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* The first four formats are not supported by the GstAudioDecoder base class.
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* (The internal gst_audio_format_from_caps_structure() call fails.)
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*
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* The 64bit float issue is tricky. mpg123 actually decodes to "real",
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* not necessarily to "float".
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*
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* "real" can be fixed point, 32bit float, 64bit float. There seems to be
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* no way how to find out which one of them is actually used.
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*
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* However, in all known installations, "real" equals 32bit float, so that's
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* what is used.
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*/
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static GstStaticPadTemplate sink_template = 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/mpeg, "
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"mpegversion = (int) { 1 }, "
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"layer = (int) [ 1, 3 ], "
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"rate = (int) { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 }, "
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"channels = (int) [ 1, 2 ], " "parsed = (boolean) true ")
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);
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static void gst_mpg123_audio_dec_finalize (GObject * object);
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static gboolean gst_mpg123_audio_dec_start (GstAudioDecoder * dec);
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static gboolean gst_mpg123_audio_dec_stop (GstAudioDecoder * dec);
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static GstFlowReturn gst_mpg123_audio_dec_push_decoded_bytes (GstMpg123AudioDec
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* mpg123_decoder, unsigned char const *decoded_bytes,
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size_t const num_decoded_bytes);
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static GstFlowReturn gst_mpg123_audio_dec_handle_frame (GstAudioDecoder * dec,
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GstBuffer * buffer);
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static gboolean gst_mpg123_audio_dec_set_format (GstAudioDecoder * dec,
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GstCaps * incoming_caps);
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static void gst_mpg123_audio_dec_flush (GstAudioDecoder * dec, gboolean hard);
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G_DEFINE_TYPE (GstMpg123AudioDec, gst_mpg123_audio_dec, GST_TYPE_AUDIO_DECODER);
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static void
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gst_mpg123_audio_dec_class_init (GstMpg123AudioDecClass * klass)
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{
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GObjectClass *object_class;
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GstAudioDecoderClass *base_class;
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GstElementClass *element_class;
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GstCaps *src_caps;
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GstPadTemplate *src_template;
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int error;
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GST_DEBUG_CATEGORY_INIT (mpg123_debug, "mpg123", 0, "mpg123 mp3 decoder");
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object_class = G_OBJECT_CLASS (klass);
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base_class = GST_AUDIO_DECODER_CLASS (klass);
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element_class = GST_ELEMENT_CLASS (klass);
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object_class->finalize = gst_mpg123_audio_dec_finalize;
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gst_element_class_set_static_metadata (element_class,
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"mpg123 mp3 decoder",
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"Codec/Decoder/Audio",
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"Decodes mp3 streams using the mpg123 library",
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"Carlos Rafael Giani <dv@pseudoterminal.org>");
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/*
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Not using static pad template for srccaps, since the comma-separated list of formats needs to be
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created depending on whatever mpg123 supports
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*/
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{
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gchar *format_string;
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gchar *caps_string;
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static gchar const *src_caps_begin = "audio/x-raw, " "format = { ";
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static gchar const *src_caps_end =
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" }, "
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"rate = (int) { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 }, "
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"channels = (int) [ 1, 2 ], " "layout = (string) interleaved; ";
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#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
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#define ENDIAN_POSTFIX "LE"
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#else
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#define ENDIAN_POSTFIX "BE"
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#endif
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static gchar *supported_formats[] = {
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#ifdef MPG123_ENC_SIGNED_16
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"S16" ENDIAN_POSTFIX,
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#endif
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#ifdef MPG123_ENC_UNSIGNED_16
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"U16" ENDIAN_POSTFIX,
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#endif
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#ifdef MPG123_ENC_SIGNED_24
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"S24" ENDIAN_POSTFIX,
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#endif
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#ifdef MPG123_ENC_UNSIGNED_24
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"U24" ENDIAN_POSTFIX,
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#endif
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#ifdef MPG123_ENC_SIGNED_32
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"S32" ENDIAN_POSTFIX,
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#endif
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#ifdef MPG123_ENC_UNSIGNED_32
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"U32" ENDIAN_POSTFIX,
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#endif
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#ifdef MPG123_ENC_FLOAT_32
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"F32" ENDIAN_POSTFIX,
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#endif
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NULL
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};
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format_string = g_strjoinv (", ", supported_formats);
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caps_string =
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g_strjoin (NULL, src_caps_begin, format_string, src_caps_end, NULL);
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src_caps = gst_caps_from_string (caps_string);
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src_template =
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gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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gst_caps_ref (src_caps));
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g_free (format_string);
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g_free (caps_string);
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}
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_add_pad_template (element_class, src_template);
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base_class->start = GST_DEBUG_FUNCPTR (gst_mpg123_audio_dec_start);
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base_class->stop = GST_DEBUG_FUNCPTR (gst_mpg123_audio_dec_stop);
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base_class->handle_frame =
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GST_DEBUG_FUNCPTR (gst_mpg123_audio_dec_handle_frame);
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base_class->set_format = GST_DEBUG_FUNCPTR (gst_mpg123_audio_dec_set_format);
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base_class->flush = GST_DEBUG_FUNCPTR (gst_mpg123_audio_dec_flush);
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error = mpg123_init ();
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if (G_UNLIKELY (error != MPG123_OK))
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GST_ERROR ("Could not initialize mpg123 library: %s",
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mpg123_plain_strerror (error));
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else
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GST_TRACE ("mpg123 library initialized");
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}
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void
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gst_mpg123_audio_dec_init (GstMpg123AudioDec * mpg123_decoder)
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{
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mpg123_decoder->handle = NULL;
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}
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static void
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gst_mpg123_audio_dec_finalize (GObject * object)
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{
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GstMpg123AudioDec *mpg123_decoder = GST_MPG123_AUDIO_DEC (object);
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if (G_LIKELY (mpg123_decoder->handle != NULL)) {
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mpg123_delete (mpg123_decoder->handle);
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mpg123_decoder->handle = NULL;
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}
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}
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static gboolean
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gst_mpg123_audio_dec_start (GstAudioDecoder * dec)
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{
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GstMpg123AudioDec *mpg123_decoder;
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int error;
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mpg123_decoder = GST_MPG123_AUDIO_DEC (dec);
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error = 0;
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mpg123_decoder->handle = mpg123_new (NULL, &error);
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mpg123_decoder->has_next_audioinfo = FALSE;
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mpg123_decoder->frame_offset = 0;
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/*
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Initially, the mpg123 handle comes with a set of default formats supported. This clears this set.
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This is necessary, since only one format shall be supported (see set_format for more).
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*/
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mpg123_format_none (mpg123_decoder->handle);
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mpg123_param (mpg123_decoder->handle, MPG123_REMOVE_FLAGS, MPG123_GAPLESS, 0); /* Built-in mpg123 support for gapless decoding is disabled for now, since it does not work well with seeking */
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mpg123_param (mpg123_decoder->handle, MPG123_ADD_FLAGS, MPG123_SEEKBUFFER, 0); /* Tells mpg123 to use a small read-ahead buffer for better MPEG sync; essential for MP3 radio streams */
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mpg123_param (mpg123_decoder->handle, MPG123_RESYNC_LIMIT, -1, 0); /* Sets the resync limit to the end of the stream (e.g. don't give up prematurely) */
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/* Open in feed mode (= encoded data is fed manually into the handle). */
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error = mpg123_open_feed (mpg123_decoder->handle);
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if (G_UNLIKELY (error != MPG123_OK)) {
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GstElement *element = GST_ELEMENT (dec);
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GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL),
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("Error opening mpg123 feed: %s", mpg123_plain_strerror (error)));
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mpg123_close (mpg123_decoder->handle);
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mpg123_delete (mpg123_decoder->handle);
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mpg123_decoder->handle = NULL;
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return FALSE;
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}
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GST_DEBUG_OBJECT (dec, "mpg123 decoder started");
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return TRUE;
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}
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static gboolean
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gst_mpg123_audio_dec_stop (GstAudioDecoder * dec)
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{
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GstMpg123AudioDec *mpg123_decoder = GST_MPG123_AUDIO_DEC (dec);
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if (G_LIKELY (mpg123_decoder->handle != NULL)) {
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mpg123_close (mpg123_decoder->handle);
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mpg123_delete (mpg123_decoder->handle);
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mpg123_decoder->handle = NULL;
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}
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GST_DEBUG_OBJECT (dec, "mpg123 decoder stopped");
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return TRUE;
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}
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static GstFlowReturn
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gst_mpg123_audio_dec_push_decoded_bytes (GstMpg123AudioDec * mpg123_decoder,
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unsigned char const *decoded_bytes, size_t const num_decoded_bytes)
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{
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GstBuffer *output_buffer;
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GstFlowReturn alloc_error;
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GstAudioDecoder *dec;
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output_buffer = NULL;
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dec = GST_AUDIO_DECODER (mpg123_decoder);
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if ((num_decoded_bytes == 0) || (decoded_bytes == NULL)) {
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/* This occurs in the first few frames, which do not carry data; once MPG123_AUDIO_DEC_NEW_FORMAT is received, the empty frames stop occurring */
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GST_TRACE_OBJECT (mpg123_decoder,
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"Nothing was decoded -> no output buffer to push");
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return GST_FLOW_OK;
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}
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output_buffer = gst_buffer_new_allocate (NULL, num_decoded_bytes, NULL);
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alloc_error = (output_buffer == NULL) ? GST_FLOW_ERROR : GST_FLOW_OK;
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if (alloc_error != GST_FLOW_OK) {
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/* This is necessary to advance playback in time, even when nothing was decoded. */
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return gst_audio_decoder_finish_frame (dec, NULL, 1);
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} else {
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GstMapInfo info;
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if (gst_buffer_map (output_buffer, &info, GST_MAP_WRITE)) {
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if (info.size != num_decoded_bytes)
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GST_ERROR_OBJECT (mpg123_decoder,
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"Mapped memory region has size %u instead of expected size %u",
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info.size, num_decoded_bytes);
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else
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memcpy (info.data, decoded_bytes, num_decoded_bytes);
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gst_buffer_unmap (output_buffer, &info);
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} else
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GST_ERROR_OBJECT (mpg123_decoder, "Could not map buffer");
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return gst_audio_decoder_finish_frame (dec, output_buffer, 1);
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}
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}
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static GstFlowReturn
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gst_mpg123_audio_dec_handle_frame (GstAudioDecoder * dec, GstBuffer * buffer)
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{
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GstMpg123AudioDec *mpg123_decoder;
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int decode_error;
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unsigned char *decoded_bytes;
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size_t num_decoded_bytes;
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if (G_UNLIKELY (!buffer))
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return GST_FLOW_OK;
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mpg123_decoder = GST_MPG123_AUDIO_DEC (dec);
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if (G_UNLIKELY (mpg123_decoder->handle == NULL)) {
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GstElement *element = GST_ELEMENT (dec);
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GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL),
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("mpg123 handle is NULL"));
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return GST_FLOW_ERROR;
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}
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/* The actual decoding */
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{
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unsigned char const *inmemory;
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size_t inmemsize;
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GstMemory *memory;
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GstMapInfo info;
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memory = gst_buffer_get_all_memory (buffer);
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if (memory == NULL)
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return GST_FLOW_ERROR;
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if (!gst_memory_map (memory, &info, GST_MAP_WRITE)) {
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gst_memory_unref (memory);
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return GST_FLOW_ERROR;
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}
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inmemory = info.data;
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inmemsize = info.size;
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mpg123_feed (mpg123_decoder->handle, inmemory, inmemsize);
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decoded_bytes = NULL;
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num_decoded_bytes = 0;
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decode_error = mpg123_decode_frame (mpg123_decoder->handle,
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&mpg123_decoder->frame_offset, &decoded_bytes, &num_decoded_bytes);
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gst_memory_unmap (memory, &info);
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gst_memory_unref (memory);
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}
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switch (decode_error) {
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case MPG123_NEW_FORMAT:
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/*
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As mentioned in gst_mpg123_audio_dec_set_format(), the next audioinfo is not set immediately;
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instead, the code waits for mpg123 to take note of the new format, and then sets the audioinfo
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This fixes glitches with mp3s containing several format headers (for example, first half using 44.1kHz, second half 32 kHz)
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*/
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GST_DEBUG_OBJECT (dec,
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"mpg123 reported a new format -> setting next srccaps");
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gst_mpg123_audio_dec_push_decoded_bytes (mpg123_decoder, decoded_bytes,
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num_decoded_bytes);
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/*
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If there is a next audioinfo, use it, then set has_next_audioinfo to FALSE, to make sure
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gst_audio_decoder_set_output_format() isn't called again until set_format is called by the base class
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*/
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if (mpg123_decoder->has_next_audioinfo) {
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if (!gst_audio_decoder_set_output_format (dec,
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&(mpg123_decoder->next_audioinfo))) {
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GstElement *element = GST_ELEMENT (dec);
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GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL),
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("Unable to set output format"));
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}
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mpg123_decoder->has_next_audioinfo = FALSE;
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}
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break;
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case MPG123_NEED_MORE:
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case MPG123_OK:
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return gst_mpg123_audio_dec_push_decoded_bytes (mpg123_decoder,
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decoded_bytes, num_decoded_bytes);
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/* If this happens, then the upstream parser somehow missed the ending of the bitstream */
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case MPG123_DONE:
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GST_DEBUG_OBJECT (dec, "mpg123 is done decoding");
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gst_mpg123_audio_dec_push_decoded_bytes (mpg123_decoder, decoded_bytes,
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num_decoded_bytes);
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return GST_FLOW_EOS;
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/* Anything else is considered an error */
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default:
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{
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GstElement *element = GST_ELEMENT (dec);
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GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL), ("Decoding error: %s",
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mpg123_plain_strerror (decode_error)));
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return GST_FLOW_ERROR;
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}
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}
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return GST_FLOW_OK;
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}
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static gboolean
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gst_mpg123_audio_dec_set_format (GstAudioDecoder * dec, GstCaps * incoming_caps)
|
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{
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/*
|
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Using the parsed information upstream, and the list of allowed caps downstream, this code
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tries to find a suitable audio info. It is important to keep in mind that the rate and number of channels
|
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should never deviate from the one the bitstream has, otherwise mpg123 has to mix channels and/or
|
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resample (and as its docs say, its internal resampler is very crude). The sample format, however,
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can be chosen freely, because the MPEG specs do not mandate any special format.
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Therefore, rate and number of channels are taken from upstream (which parsed the MPEG frames, so
|
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the incoming_caps contain exactly the rate and number of channels the bitstream actually has), while
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the sample format is chosen by trying out all caps that are allowed by downstream. This way, the output
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is adjusted to what the downstream prefers.
|
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Also, the new output audio info is not set immediately. Instead, it is considered the "next audioinfo".
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The code waits for mpg123 to notice the new format (= when mpg123_decode_frame() returns MPG123_AUDIO_DEC_NEW_FORMAT),
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and then sets the next audioinfo. Otherwise, the next audioinfo is set too soon, which may cause problems with
|
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mp3s containing several format headers. One example would be an mp3 with the first 30 seconds using 44.1 kHz,
|
||||
then the next 30 seconds using 32 kHz. Rare, but possible.
|
||||
|
||||
STEPS:
|
||||
|
||||
1. get rate and channels from incoming_caps
|
||||
2. get allowed caps from src pad
|
||||
3. for each structure in allowed caps:
|
||||
3.1. take format
|
||||
3.2. if the combination of format with rate and channels is unsupported by mpg123, go to (3),
|
||||
or exit with error if there are no more structures to try
|
||||
3.3. create next audioinfo out of rate,channels,format, and exit
|
||||
*/
|
||||
|
||||
|
||||
int rate, channels;
|
||||
GstMpg123AudioDec *mpg123_decoder;
|
||||
GstCaps *allowed_srccaps;
|
||||
guint structure_nr;
|
||||
gboolean match_found = FALSE;
|
||||
|
||||
mpg123_decoder = GST_MPG123_AUDIO_DEC (dec);
|
||||
|
||||
if (G_UNLIKELY (mpg123_decoder->handle == NULL)) {
|
||||
GstElement *element = GST_ELEMENT (dec);
|
||||
GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL),
|
||||
("mpg123 handle is NULL"));
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
mpg123_decoder->has_next_audioinfo = FALSE;
|
||||
|
||||
/* Get rate and channels from incoming_caps */
|
||||
{
|
||||
GstStructure *structure;
|
||||
gboolean err = FALSE;
|
||||
|
||||
/* Only the first structure is used (multiple incoming structures don't make sense */
|
||||
structure = gst_caps_get_structure (incoming_caps, 0);
|
||||
|
||||
if (!gst_structure_get_int (structure, "rate", &rate)) {
|
||||
err = TRUE;
|
||||
GST_ERROR_OBJECT (dec, "Incoming caps do not have a rate value");
|
||||
}
|
||||
if (!gst_structure_get_int (structure, "channels", &channels)) {
|
||||
err = TRUE;
|
||||
GST_ERROR_OBJECT (dec, "Incoming caps do not have a channel value");
|
||||
}
|
||||
|
||||
if (err)
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/* Get the caps that are allowed by downstream */
|
||||
{
|
||||
GstCaps *allowed_srccaps_unnorm =
|
||||
gst_pad_get_allowed_caps (GST_AUDIO_DECODER_SRC_PAD (dec));
|
||||
allowed_srccaps = gst_caps_normalize (allowed_srccaps_unnorm);
|
||||
/* TODO: this causes errors with 1.0 - perhaps a bug? */
|
||||
/*gst_caps_unref(allowed_srccaps_unnorm); */
|
||||
}
|
||||
|
||||
/* Go through all allowed caps, pick the first one that matches */
|
||||
for (structure_nr = 0; structure_nr < gst_caps_get_size (allowed_srccaps);
|
||||
++structure_nr) {
|
||||
GstStructure *structure;
|
||||
gchar const *format_str;
|
||||
GstAudioFormat format;
|
||||
int encoding;
|
||||
|
||||
structure = gst_caps_get_structure (allowed_srccaps, structure_nr);
|
||||
|
||||
format_str = gst_structure_get_string (structure, "format");
|
||||
if (format_str == NULL) {
|
||||
GST_DEBUG_OBJECT (dec, "Could not get format from src caps");
|
||||
continue;
|
||||
}
|
||||
|
||||
format = gst_audio_format_from_string (format_str);
|
||||
if (format == GST_AUDIO_FORMAT_UNKNOWN) {
|
||||
GST_DEBUG_OBJECT (dec, "Unknown format %s", format_str);
|
||||
continue;
|
||||
}
|
||||
|
||||
switch (format) {
|
||||
#ifdef MPG123_ENC_SIGNED_16
|
||||
case GST_AUDIO_FORMAT_S16:
|
||||
encoding = MPG123_ENC_SIGNED_16;
|
||||
break;
|
||||
#endif
|
||||
#ifdef MPG123_ENC_SIGNED_24
|
||||
case GST_AUDIO_FORMAT_S24:
|
||||
encoding = MPG123_ENC_SIGNED_24;
|
||||
break;
|
||||
#endif
|
||||
#ifdef MPG123_ENC_SIGNED_32
|
||||
case GST_AUDIO_FORMAT_S32:
|
||||
encoding = MPG123_ENC_SIGNED_32;
|
||||
break;
|
||||
#endif
|
||||
#ifdef MPG123_ENC_UNSIGNED_16
|
||||
case GST_AUDIO_FORMAT_U16:
|
||||
encoding = MPG123_ENC_UNSIGNED_16;
|
||||
break;
|
||||
#endif
|
||||
#ifdef MPG123_ENC_UNSIGNED_24
|
||||
case GST_AUDIO_FORMAT_U24:
|
||||
encoding = MPG123_ENC_UNSIGNED_24;
|
||||
break;
|
||||
#endif
|
||||
#ifdef MPG123_ENC_UNSIGNED_32
|
||||
case GST_AUDIO_FORMAT_U32:
|
||||
encoding = MPG123_ENC_UNSIGNED_32;
|
||||
break;
|
||||
#endif
|
||||
#ifdef MPG123_ENC_FLOAT_32
|
||||
case GST_AUDIO_FORMAT_F32:
|
||||
encoding = MPG123_ENC_FLOAT_32;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
GST_DEBUG_OBJECT (dec,
|
||||
"Format %s in srccaps is not supported by mpg123", format_str);
|
||||
continue;
|
||||
}
|
||||
|
||||
{
|
||||
int err;
|
||||
|
||||
/* Cleanup old formats & set new one */
|
||||
mpg123_format_none (mpg123_decoder->handle);
|
||||
err = mpg123_format (mpg123_decoder->handle, rate, channels, encoding);
|
||||
if (err != MPG123_OK) {
|
||||
GST_DEBUG_OBJECT (dec,
|
||||
"mpg123 cannot use caps %" GST_PTR_FORMAT
|
||||
" because mpg123_format() failed: %s", structure,
|
||||
mpg123_plain_strerror (err));
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
gst_audio_info_init (&(mpg123_decoder->next_audioinfo));
|
||||
gst_audio_info_set_format (&(mpg123_decoder->next_audioinfo), format, rate,
|
||||
channels, NULL);
|
||||
GST_DEBUG_OBJECT (dec, "The next audio format is: %s, %u Hz, %u channels",
|
||||
format_str, rate, channels);
|
||||
mpg123_decoder->has_next_audioinfo = TRUE;
|
||||
|
||||
match_found = TRUE;
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
gst_caps_unref (allowed_srccaps);
|
||||
|
||||
return match_found;
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
gst_mpg123_audio_dec_flush (GstAudioDecoder * dec, gboolean hard)
|
||||
{
|
||||
int error;
|
||||
GstMpg123AudioDec *mpg123_decoder;
|
||||
|
||||
hard = hard;
|
||||
|
||||
GST_DEBUG_OBJECT (dec, "Flushing decoder");
|
||||
|
||||
mpg123_decoder = GST_MPG123_AUDIO_DEC (dec);
|
||||
|
||||
if (G_UNLIKELY (mpg123_decoder->handle == NULL)) {
|
||||
GstElement *element = GST_ELEMENT (dec);
|
||||
GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL),
|
||||
("mpg123 handle is NULL"));
|
||||
return;
|
||||
}
|
||||
|
||||
/* Flush by reopening the feed */
|
||||
mpg123_close (mpg123_decoder->handle);
|
||||
error = mpg123_open_feed (mpg123_decoder->handle);
|
||||
|
||||
if (G_UNLIKELY (error != MPG123_OK)) {
|
||||
GstElement *element = GST_ELEMENT (dec);
|
||||
GST_ELEMENT_ERROR (element, STREAM, DECODE, (NULL),
|
||||
("Error reopening mpg123 feed: %s", mpg123_plain_strerror (error)));
|
||||
mpg123_close (mpg123_decoder->handle);
|
||||
mpg123_delete (mpg123_decoder->handle);
|
||||
mpg123_decoder->handle = NULL;
|
||||
}
|
||||
|
||||
mpg123_decoder->has_next_audioinfo = FALSE;
|
||||
|
||||
/*
|
||||
opening/closing feeds do not affect the format defined by the mpg123_format() call that was made in gst_mpg123_audio_dec_set_format(),
|
||||
and since the up/downstream caps are not expected to change here, no mpg123_format() calls are done
|
||||
*/
|
||||
}
|
||||
|
||||
static gboolean
|
||||
plugin_init (GstPlugin * plugin)
|
||||
{
|
||||
return gst_element_register (plugin, "mpg123audiodec",
|
||||
GST_RANK_NONE, gst_mpg123_audio_dec_get_type ());
|
||||
}
|
||||
|
||||
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
|
||||
GST_VERSION_MINOR,
|
||||
mpg123, "mp3 decoding based on the mpg123 library",
|
||||
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
|
||||
62
ext/mpg123/gstmpg123audiodec.h
Normal file
62
ext/mpg123/gstmpg123audiodec.h
Normal file
|
|
@ -0,0 +1,62 @@
|
|||
/* MP3 decoding plugin for GStreamer using the mpg123 library
|
||||
* Copyright (C) 2012 Carlos Rafael Giani
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#ifndef __GST_MPG123_AUDIO_DEC_H__
|
||||
#define __GST_MPG123_AUDIO_DEC_H__
|
||||
|
||||
#include <gst/gst.h>
|
||||
#include <gst/audio/gstaudiodecoder.h>
|
||||
#include <mpg123.h>
|
||||
|
||||
|
||||
G_BEGIN_DECLS
|
||||
|
||||
|
||||
typedef struct _GstMpg123AudioDec GstMpg123AudioDec;
|
||||
typedef struct _GstMpg123AudioDecClass GstMpg123AudioDecClass;
|
||||
|
||||
|
||||
#define GST_TYPE_MPG123_AUDIO_DEC (gst_mpg123_audio_dec_get_type())
|
||||
#define GST_MPG123_AUDIO_DEC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_MPG123_AUDIO_DEC,GstMpg123AudioDec))
|
||||
#define GST_MPG123_AUDIO_DEC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_MPG123_AUDIO_DEC,GstMpg123AudioDecClass))
|
||||
#define GST_IS_MPG123_AUDIO_DEC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_MPG123_AUDIO_DEC))
|
||||
#define GST_IS_MPG123_AUDIO_DEC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_MPG123_AUDIO_DEC))
|
||||
|
||||
struct _GstMpg123AudioDec
|
||||
{
|
||||
GstAudioDecoder parent;
|
||||
|
||||
mpg123_handle *handle;
|
||||
|
||||
GstAudioInfo next_audioinfo;
|
||||
gboolean has_next_audioinfo;
|
||||
|
||||
off_t frame_offset;
|
||||
};
|
||||
|
||||
|
||||
struct _GstMpg123AudioDecClass
|
||||
{
|
||||
GstAudioDecoderClass parent_class;
|
||||
};
|
||||
|
||||
G_GNUC_INTERNAL GType gst_mpg123_audio_dec_get_type (void);
|
||||
|
||||
G_END_DECLS
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue