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598 lines
16 KiB
C
598 lines
16 KiB
C
/* GStreamer Adaptive Multi-Rate parser plugin
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* Copyright (C) 2006 Edgard Lima <edgard.lima@indt.org.br>
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* Copyright (C) 2008 Nokia Corporation. All rights reserved.
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*
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* Contact: Stefan Kost <stefan.kost@nokia.com>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstamrparse
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* @short_description: AMR parser
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* @see_also: #GstAmrnbDec, #GstAmrnbEnc
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*
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* <refsect2>
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* <para>
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* This is an AMR parser capable of handling both narrow-band and wideband
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* formats.
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* </para>
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* <title>Example launch line</title>
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* <para>
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* <programlisting>
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* gst-launch filesrc location=abc.amr ! amrparse ! amrdec ! audioresample ! audioconvert ! alsasink
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* </programlisting>
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* </para>
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* </refsect2>
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*/
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#include <string.h>
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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 "gstamrparse.h"
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/AMR, " "rate = (int) 8000, " "channels = (int) 1;"
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"audio/AMR-WB, " "rate = (int) 16000, " "channels = (int) 1;")
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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/x-amr-nb-sh; audio/x-amr-wb-sh"));
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GST_DEBUG_CATEGORY_STATIC (gst_amrparse_debug);
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#define GST_CAT_DEFAULT gst_amrparse_debug
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static const gint block_size_nb[16] =
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{ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
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static const gint block_size_wb[16] =
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{ 17, 23, 32, 36, 40, 46, 50, 58, 60, 5, 5, 0, 0, 0, 0, 0 };
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/* AMR has a "hardcoded" framerate of 50fps */
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#define AMR_FRAMES_PER_SECOND 50
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#define AMR_FRAME_DURATION (GST_SECOND/AMR_FRAMES_PER_SECOND)
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#define AMR_MIME_HEADER_SIZE 9
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static void gst_amrparse_finalize (GObject * object);
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gboolean gst_amrparse_start (GstBaseParse * parse);
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gboolean gst_amrparse_stop (GstBaseParse * parse);
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static gboolean gst_amrparse_sink_setcaps (GstBaseParse * parse,
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GstCaps * caps);
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gboolean gst_amrparse_check_valid_frame (GstBaseParse * parse,
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GstBuffer * buffer, guint * framesize, gint * skipsize);
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GstFlowReturn gst_amrparse_parse_frame (GstBaseParse * parse,
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GstBuffer * buffer);
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gboolean gst_amrparse_convert (GstBaseParse * parse,
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GstFormat src_format,
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gint64 src_value, GstFormat dest_format, gint64 * dest_value);
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gboolean gst_amrparse_event (GstBaseParse * parse, GstEvent * event);
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#define _do_init(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_amrparse_debug, "amrparse", 0, \
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"AMR-NB audio stream parser");
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GST_BOILERPLATE_FULL (GstAmrParse, gst_amrparse, GstBaseParse,
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GST_TYPE_BASE_PARSE, _do_init);
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/**
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* gst_amrparse_base_init:
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* @klass: #GstElementClass.
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*
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*/
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static void
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gst_amrparse_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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GstElementDetails details = GST_ELEMENT_DETAILS ("AMR audio stream parser",
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"Codec/Parser/Audio",
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"Adaptive Multi-Rate audio parser",
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"Ronald Bultje <rbultje@ronald.bitfreak.net>");
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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,
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gst_static_pad_template_get (&src_template));
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gst_element_class_set_details (element_class, &details);
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}
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/**
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* gst_amrparse_class_init:
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* @klass: GstAmrParseClass.
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*
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*/
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static void
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gst_amrparse_class_init (GstAmrParseClass * klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
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object_class->finalize = gst_amrparse_finalize;
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parse_class->start = GST_DEBUG_FUNCPTR (gst_amrparse_start);
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parse_class->stop = GST_DEBUG_FUNCPTR (gst_amrparse_stop);
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parse_class->event = GST_DEBUG_FUNCPTR (gst_amrparse_event);
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parse_class->convert = GST_DEBUG_FUNCPTR (gst_amrparse_convert);
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parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_amrparse_sink_setcaps);
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parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_amrparse_parse_frame);
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parse_class->check_valid_frame =
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GST_DEBUG_FUNCPTR (gst_amrparse_check_valid_frame);
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}
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/**
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* gst_amrparse_init:
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* @amrparse: #GstAmrParse
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* @klass: #GstAmrParseClass.
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*
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*/
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static void
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gst_amrparse_init (GstAmrParse * amrparse, GstAmrParseClass * klass)
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{
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/* init rest */
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gst_base_parse_set_min_frame_size (GST_BASE_PARSE (amrparse), 62);
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amrparse->ts = 0;
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GST_DEBUG ("initialized");
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}
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/**
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* gst_amrparse_finalize:
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* @object:
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*
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*/
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static void
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gst_amrparse_finalize (GObject * object)
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{
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GstAmrParse *amrparse;
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amrparse = GST_AMRPARSE (object);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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/**
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* gst_amrparse_set_src_caps:
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* @amrparse: #GstAmrParse.
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*
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* Set source pad caps according to current knowledge about the
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* audio stream.
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*
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* Returns: TRUE if caps were successfully set.
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*/
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static gboolean
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gst_amrparse_set_src_caps (GstAmrParse * amrparse)
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{
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GstCaps *src_caps = NULL;
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gboolean res = FALSE;
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if (amrparse->wide) {
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GST_DEBUG_OBJECT (amrparse, "setting srcpad caps to AMR-WB");
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src_caps = gst_caps_new_simple ("audio/AMR-WB",
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"channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 16000, NULL);
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} else {
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GST_DEBUG_OBJECT (amrparse, "setting srcpad caps to AMR-NB");
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/* Max. size of NB frame is 31 bytes, so we can set the min. frame
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size to 32 (+1 for next frame header) */
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gst_base_parse_set_min_frame_size (GST_BASE_PARSE (amrparse), 32);
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src_caps = gst_caps_new_simple ("audio/AMR",
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"channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 8000, NULL);
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}
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gst_pad_use_fixed_caps (GST_BASE_PARSE (amrparse)->srcpad);
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res = gst_pad_set_caps (GST_BASE_PARSE (amrparse)->srcpad, src_caps);
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gst_caps_unref (src_caps);
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return res;
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}
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/**
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* gst_amrparse_sink_setcaps:
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* @sinkpad: GstPad
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* @caps: GstCaps
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*
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* Returns: TRUE on success.
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*/
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static gboolean
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gst_amrparse_sink_setcaps (GstBaseParse * parse, GstCaps * caps)
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{
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GstAmrParse *amrparse;
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GstStructure *structure;
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const gchar *name;
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amrparse = GST_AMRPARSE (parse);
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structure = gst_caps_get_structure (caps, 0);
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name = gst_structure_get_name (structure);
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GST_DEBUG_OBJECT (amrparse, "setcaps: %s", name);
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if (!strncmp (name, "audio/x-amr-wb-sh", 17)) {
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amrparse->block_size = block_size_wb;
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amrparse->wide = 1;
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} else if (!strncmp (name, "audio/x-amr-nb-sh", 17)) {
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amrparse->block_size = block_size_nb;
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amrparse->wide = 0;
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} else {
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GST_WARNING ("Unknown caps");
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return FALSE;
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}
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amrparse->need_header = FALSE;
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gst_amrparse_set_src_caps (amrparse);
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return TRUE;
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}
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/**
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* gst_amrparse_update_duration:
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* @amrparse: #GstAmrParse.
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*
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* Send duration information to base class.
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*/
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static void
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gst_amrparse_update_duration (GstAmrParse * amrparse)
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{
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GstPad *peer;
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GstBaseParse *parse;
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parse = GST_BASE_PARSE (amrparse);
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/* Cannot estimate duration. No data has been passed to us yet */
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if (!amrparse->framecount) {
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return;
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}
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peer = gst_pad_get_peer (parse->sinkpad);
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if (peer) {
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GstFormat pformat = GST_FORMAT_BYTES;
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guint64 bpf = amrparse->bytecount / amrparse->framecount;
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gboolean qres = FALSE;
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gint64 ptot;
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qres = gst_pad_query_duration (peer, &pformat, &ptot);
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gst_object_unref (GST_OBJECT (peer));
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if (qres && bpf) {
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gst_base_parse_set_duration (parse, GST_FORMAT_TIME,
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AMR_FRAME_DURATION * ptot / bpf);
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}
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}
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}
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/**
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* gst_amrparse_parse_header:
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* @amrparse: #GstAmrParse
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* @data: Header data to be parsed.
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* @skipsize: Output argument where the frame size will be stored.
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*
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* Check if the given data contains an AMR mime header.
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*
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* Returns: TRUE on success.
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*/
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static gboolean
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gst_amrparse_parse_header (GstAmrParse * amrparse,
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const guint8 * data, gint * skipsize)
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{
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GST_DEBUG_OBJECT (amrparse, "Parsing header data");
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if (!memcmp (data, "#!AMR-WB\n", 9)) {
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GST_DEBUG_OBJECT (amrparse, "AMR-WB detected");
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amrparse->block_size = block_size_wb;
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amrparse->wide = TRUE;
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*skipsize = amrparse->header = 9;
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} else if (!memcmp (data, "#!AMR\n", 6)) {
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GST_DEBUG_OBJECT (amrparse, "AMR-NB detected");
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amrparse->block_size = block_size_nb;
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amrparse->wide = FALSE;
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*skipsize = amrparse->header = 6;
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} else
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return FALSE;
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gst_amrparse_set_src_caps (amrparse);
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return TRUE;
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}
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/**
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* gst_amrparse_check_valid_frame:
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* @parse: #GstBaseParse.
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* @buffer: #GstBuffer.
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* @framesize: Output variable where the found frame size is put.
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* @skipsize: Output variable which tells how much data needs to be skipped
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* until a frame header is found.
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*
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* Implementation of "check_valid_frame" vmethod in #GstBaseParse class.
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*
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* Returns: TRUE if the given data contains valid frame.
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*/
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gboolean
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gst_amrparse_check_valid_frame (GstBaseParse * parse,
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GstBuffer * buffer, guint * framesize, gint * skipsize)
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{
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const guint8 *data;
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gint fsize, mode, dsize;
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GstAmrParse *amrparse;
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amrparse = GST_AMRPARSE (parse);
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data = GST_BUFFER_DATA (buffer);
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dsize = GST_BUFFER_SIZE (buffer);
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GST_LOG ("buffer: %d bytes", dsize);
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
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/* Discontinuous stream -> drop the sync */
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amrparse->sync = FALSE;
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}
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if (amrparse->need_header) {
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if (dsize >= AMR_MIME_HEADER_SIZE &&
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gst_amrparse_parse_header (amrparse, data, skipsize)) {
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amrparse->need_header = FALSE;
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} else {
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GST_WARNING ("media doesn't look like a AMR format");
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}
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/* We return FALSE, so this frame won't get pushed forward. Instead,
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the "skip" value is set, so next time we will receive a valid frame. */
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return FALSE;
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}
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/* Does this look like a possible frame header candidate? */
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if ((data[0] & 0x83) == 0) {
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/* Yep. Retrieve the frame size */
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mode = (data[0] >> 3) & 0x0F;
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fsize = amrparse->block_size[mode] + 1; /* +1 for the header byte */
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/* We recognize this data as a valid frame when:
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* - We are in sync. There is no need for extra checks then
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* - We are in EOS. There might not be enough data to check next frame
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* - Sync is lost, but the following data after this frame seem
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* to contain a valid header as well (and there is enough data to
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* perform this check)
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*/
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if (amrparse->sync || amrparse->eos ||
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(dsize >= fsize && (data[fsize] & 0x83) == 0)) {
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amrparse->sync = TRUE;
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*framesize = fsize;
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return TRUE;
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}
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}
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GST_LOG ("sync lost");
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amrparse->sync = FALSE;
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return FALSE;
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}
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/**
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* gst_amrparse_parse_frame:
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* @parse: #GstBaseParse.
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* @buffer: #GstBuffer.
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*
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* Implementation of "parse" vmethod in #GstBaseParse class.
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*
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* Returns: #GstFlowReturn defining the parsing status.
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*/
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GstFlowReturn
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gst_amrparse_parse_frame (GstBaseParse * parse, GstBuffer * buffer)
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{
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GstAmrParse *amrparse;
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amrparse = GST_AMRPARSE (parse);
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if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
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gint64 btime;
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gboolean r = gst_amrparse_convert (parse, GST_FORMAT_BYTES,
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GST_BUFFER_OFFSET (buffer),
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GST_FORMAT_TIME, &btime);
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if (r) {
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/* FIXME: What to do if the conversion fails? */
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amrparse->ts = btime;
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}
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}
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GST_BUFFER_DURATION (buffer) = AMR_FRAME_DURATION;
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GST_BUFFER_TIMESTAMP (buffer) = amrparse->ts;
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if (GST_CLOCK_TIME_IS_VALID (amrparse->ts)) {
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amrparse->ts += AMR_FRAME_DURATION;
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}
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if (!(++amrparse->framecount % 50)) {
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gst_amrparse_update_duration (amrparse);
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}
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amrparse->bytecount += GST_BUFFER_SIZE (buffer);
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gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
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return GST_FLOW_OK;
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}
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/**
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* gst_amrparse_start:
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* @parse: #GstBaseParse.
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*
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* Implementation of "start" vmethod in #GstBaseParse class.
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*
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* Returns: TRUE on success.
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*/
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gboolean
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gst_amrparse_start (GstBaseParse * parse)
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{
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GstAmrParse *amrparse;
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amrparse = GST_AMRPARSE (parse);
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GST_DEBUG ("start");
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amrparse->need_header = TRUE;
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amrparse->header = 0;
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amrparse->sync = TRUE;
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amrparse->eos = FALSE;
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amrparse->framecount = 0;
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amrparse->bytecount = 0;
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amrparse->ts = 0;
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return TRUE;
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}
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/**
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* gst_amrparse_stop:
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* @parse: #GstBaseParse.
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*
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* Implementation of "stop" vmethod in #GstBaseParse class.
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*
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* Returns: TRUE on success.
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*/
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gboolean
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gst_amrparse_stop (GstBaseParse * parse)
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{
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GstAmrParse *amrparse;
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amrparse = GST_AMRPARSE (parse);
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GST_DEBUG ("stop");
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amrparse->need_header = TRUE;
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amrparse->header = 0;
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amrparse->ts = -1;
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return TRUE;
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}
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/**
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* gst_amrparse_event:
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* @parse: #GstBaseParse.
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* @event: #GstEvent.
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*
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* Implementation of "event" vmethod in #GstBaseParse class.
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*
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* Returns: TRUE if the event was handled and can be dropped.
|
|
*/
|
|
gboolean
|
|
gst_amrparse_event (GstBaseParse * parse, GstEvent * event)
|
|
{
|
|
GstAmrParse *amrparse;
|
|
|
|
amrparse = GST_AMRPARSE (parse);
|
|
GST_DEBUG ("event");
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_EOS:
|
|
amrparse->eos = TRUE;
|
|
GST_DEBUG ("EOS event");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return parent_class->event (parse, event);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_amrparse_convert:
|
|
* @parse: #GstBaseParse.
|
|
* @src_format: #GstFormat describing the source format.
|
|
* @src_value: Source value to be converted.
|
|
* @dest_format: #GstFormat defining the converted format.
|
|
* @dest_value: Pointer where the conversion result will be put.
|
|
*
|
|
* Implementation of "convert" vmethod in #GstBaseParse class.
|
|
*
|
|
* Returns: TRUE if conversion was successful.
|
|
*/
|
|
gboolean
|
|
gst_amrparse_convert (GstBaseParse * parse,
|
|
GstFormat src_format,
|
|
gint64 src_value, GstFormat dest_format, gint64 * dest_value)
|
|
{
|
|
gboolean ret = FALSE;
|
|
GstAmrParse *amrparse;
|
|
gfloat bpf;
|
|
|
|
amrparse = GST_AMRPARSE (parse);
|
|
|
|
/* We are not able to do any estimations until some data has been passed */
|
|
if (!amrparse->framecount)
|
|
return FALSE;
|
|
|
|
bpf = (gfloat) amrparse->bytecount / amrparse->framecount;
|
|
|
|
if (src_format == GST_FORMAT_BYTES) {
|
|
if (dest_format == GST_FORMAT_TIME) {
|
|
/* BYTES -> TIME conversion */
|
|
GST_DEBUG ("converting bytes -> time");
|
|
|
|
if (amrparse->framecount) {
|
|
*dest_value = AMR_FRAME_DURATION * (src_value - amrparse->header) / bpf;
|
|
GST_DEBUG ("conversion result: %lld ms", *dest_value / GST_MSECOND);
|
|
ret = TRUE;
|
|
}
|
|
}
|
|
} else if (src_format == GST_FORMAT_TIME) {
|
|
GST_DEBUG ("converting time -> bytes");
|
|
if (dest_format == GST_FORMAT_BYTES) {
|
|
if (amrparse->framecount) {
|
|
*dest_value = bpf * src_value / AMR_FRAME_DURATION + amrparse->header;
|
|
GST_DEBUG ("time %lld ms in bytes = %lld",
|
|
src_value / GST_MSECOND, *dest_value);
|
|
ret = TRUE;
|
|
}
|
|
}
|
|
} else if (src_format == GST_FORMAT_DEFAULT) {
|
|
/* DEFAULT == frame-based */
|
|
if (dest_format == GST_FORMAT_TIME) {
|
|
*dest_value = src_value * AMR_FRAME_DURATION;
|
|
ret = TRUE;
|
|
} else if (dest_format == GST_FORMAT_BYTES) {
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* plugin_init:
|
|
* @plugin: GstPlugin
|
|
*
|
|
* Returns: TRUE on success.
|
|
*/
|
|
static gboolean
|
|
plugin_init (GstPlugin * plugin)
|
|
{
|
|
return gst_element_register (plugin, "amrparse",
|
|
GST_RANK_PRIMARY + 1, GST_TYPE_AMRPARSE);
|
|
}
|
|
|
|
|
|
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
"amrparse",
|
|
"Adaptive Multi-Rate Parser",
|
|
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
|