--- /dev/null
+/* GStreamer Adaptive Multi-Rate parser plugin
+ * Copyright (C) 2006 Edgard Lima <edgard.lima@indt.org.br>
+ * Copyright (C) 2008 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Stefan Kost <stefan.kost@nokia.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gstamrparse
+ * @short_description: AMR parser
+ * @see_also: #GstAmrnbDec, #GstAmrnbEnc
+ *
+ * <refsect2>
+ * <para>
+ * This is an AMR parser capable of handling both narrow-band and wideband
+ * formats.
+ * </para>
+ * <title>Example launch line</title>
+ * <para>
+ * <programlisting>
+ * gst-launch filesrc location=abc.amr ! amrparse ! amrdec ! audioresample ! audioconvert ! alsasink
+ * </programlisting>
+ * </para>
+ * </refsect2>
+ */
+
+#include <string.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstamrparse.h"
+
+
+static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("audio/AMR, " "rate = (int) 8000, " "channels = (int) 1;"
+ "audio/AMR-WB, " "rate = (int) 16000, " "channels = (int) 1;")
+ );
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("audio/x-amr-nb-sh; audio/x-amr-wb-sh"));
+
+GST_DEBUG_CATEGORY_STATIC (gst_amrparse_debug);
+#define GST_CAT_DEFAULT gst_amrparse_debug
+
+static const gint block_size_nb[16] =
+ { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
+
+static const gint block_size_wb[16] =
+ { 17, 23, 32, 36, 40, 46, 50, 58, 60, 5, 5, 0, 0, 0, 0, 0 };
+
+/* AMR has a "hardcoded" framerate of 50fps */
+#define AMR_FRAMES_PER_SECOND 50
+#define AMR_FRAME_DURATION (GST_SECOND/AMR_FRAMES_PER_SECOND)
+#define AMR_MIME_HEADER_SIZE 9
+
+static void gst_amrparse_finalize (GObject * object);
+
+gboolean gst_amrparse_start (GstBaseParse * parse);
+gboolean gst_amrparse_stop (GstBaseParse * parse);
+
+static gboolean gst_amrparse_sink_setcaps (GstBaseParse * parse,
+ GstCaps * caps);
+
+gboolean gst_amrparse_check_valid_frame (GstBaseParse * parse,
+ GstBuffer * buffer, guint * framesize, gint * skipsize);
+
+GstFlowReturn gst_amrparse_parse_frame (GstBaseParse * parse,
+ GstBuffer * buffer);
+
+gboolean gst_amrparse_convert (GstBaseParse * parse,
+ GstFormat src_format,
+ gint64 src_value, GstFormat dest_format, gint64 * dest_value);
+
+gboolean gst_amrparse_event (GstBaseParse * parse, GstEvent * event);
+
+#define _do_init(bla) \
+ GST_DEBUG_CATEGORY_INIT (gst_amrparse_debug, "amrparse", 0, \
+ "AMR-NB audio stream parser");
+
+GST_BOILERPLATE_FULL (GstAmrParse, gst_amrparse, GstBaseParse,
+ GST_TYPE_BASE_PARSE, _do_init);
+
+
+/**
+ * gst_amrparse_base_init:
+ * @klass: #GstElementClass.
+ *
+ */
+static void
+gst_amrparse_base_init (gpointer klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+ GstElementDetails details = GST_ELEMENT_DETAILS ("AMR audio stream parser",
+ "Codec/Parser/Audio",
+ "Adaptive Multi-Rate audio parser",
+ "Ronald Bultje <rbultje@ronald.bitfreak.net>");
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&sink_template));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&src_template));
+
+ gst_element_class_set_details (element_class, &details);
+}
+
+
+/**
+ * gst_amrparse_class_init:
+ * @klass: GstAmrParseClass.
+ *
+ */
+static void
+gst_amrparse_class_init (GstAmrParseClass * klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
+
+ object_class->finalize = gst_amrparse_finalize;
+
+ parse_class->start = GST_DEBUG_FUNCPTR (gst_amrparse_start);
+ parse_class->stop = GST_DEBUG_FUNCPTR (gst_amrparse_stop);
+ parse_class->event = GST_DEBUG_FUNCPTR (gst_amrparse_event);
+ parse_class->convert = GST_DEBUG_FUNCPTR (gst_amrparse_convert);
+ parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_amrparse_sink_setcaps);
+ parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_amrparse_parse_frame);
+ parse_class->check_valid_frame =
+ GST_DEBUG_FUNCPTR (gst_amrparse_check_valid_frame);
+}
+
+
+/**
+ * gst_amrparse_init:
+ * @amrparse: #GstAmrParse
+ * @klass: #GstAmrParseClass.
+ *
+ */
+static void
+gst_amrparse_init (GstAmrParse * amrparse, GstAmrParseClass * klass)
+{
+ /* init rest */
+ gst_base_parse_set_min_frame_size (GST_BASE_PARSE (amrparse), 62);
+ amrparse->ts = 0;
+ GST_DEBUG ("initialized");
+
+}
+
+
+/**
+ * gst_amrparse_finalize:
+ * @object:
+ *
+ */
+static void
+gst_amrparse_finalize (GObject * object)
+{
+ GstAmrParse *amrparse;
+
+ amrparse = GST_AMRPARSE (object);
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+
+/**
+ * gst_amrparse_set_src_caps:
+ * @amrparse: #GstAmrParse.
+ *
+ * Set source pad caps according to current knowledge about the
+ * audio stream.
+ *
+ * Returns: TRUE if caps were successfully set.
+ */
+static gboolean
+gst_amrparse_set_src_caps (GstAmrParse * amrparse)
+{
+ GstCaps *src_caps = NULL;
+ gboolean res = FALSE;
+
+ if (amrparse->wide) {
+ GST_DEBUG_OBJECT (amrparse, "setting srcpad caps to AMR-WB");
+ src_caps = gst_caps_new_simple ("audio/AMR-WB",
+ "channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 16000, NULL);
+ } else {
+ GST_DEBUG_OBJECT (amrparse, "setting srcpad caps to AMR-NB");
+ /* Max. size of NB frame is 31 bytes, so we can set the min. frame
+ size to 32 (+1 for next frame header) */
+ gst_base_parse_set_min_frame_size (GST_BASE_PARSE (amrparse), 32);
+ src_caps = gst_caps_new_simple ("audio/AMR",
+ "channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 8000, NULL);
+ }
+ gst_pad_use_fixed_caps (GST_BASE_PARSE (amrparse)->srcpad);
+ res = gst_pad_set_caps (GST_BASE_PARSE (amrparse)->srcpad, src_caps);
+ gst_caps_unref (src_caps);
+ return res;
+}
+
+
+/**
+ * gst_amrparse_sink_setcaps:
+ * @sinkpad: GstPad
+ * @caps: GstCaps
+ *
+ * Returns: TRUE on success.
+ */
+static gboolean
+gst_amrparse_sink_setcaps (GstBaseParse * parse, GstCaps * caps)
+{
+ GstAmrParse *amrparse;
+ GstStructure *structure;
+ const gchar *name;
+
+ amrparse = GST_AMRPARSE (parse);
+ structure = gst_caps_get_structure (caps, 0);
+ name = gst_structure_get_name (structure);
+
+ GST_DEBUG_OBJECT (amrparse, "setcaps: %s", name);
+
+ if (!strncmp (name, "audio/x-amr-wb-sh", 17)) {
+ amrparse->block_size = block_size_wb;
+ amrparse->wide = 1;
+ } else if (!strncmp (name, "audio/x-amr-nb-sh", 17)) {
+ amrparse->block_size = block_size_nb;
+ amrparse->wide = 0;
+ } else {
+ GST_WARNING ("Unknown caps");
+ return FALSE;
+ }
+
+ amrparse->need_header = FALSE;
+ gst_amrparse_set_src_caps (amrparse);
+ return TRUE;
+}
+
+
+/**
+ * gst_amrparse_update_duration:
+ * @amrparse: #GstAmrParse.
+ *
+ * Send duration information to base class.
+ */
+static void
+gst_amrparse_update_duration (GstAmrParse * amrparse)
+{
+ GstPad *peer;
+ GstBaseParse *parse;
+
+ parse = GST_BASE_PARSE (amrparse);
+
+ /* Cannot estimate duration. No data has been passed to us yet */
+ if (!amrparse->framecount) {
+ return;
+ }
+
+ peer = gst_pad_get_peer (parse->sinkpad);
+ if (peer) {
+ GstFormat pformat = GST_FORMAT_BYTES;
+ guint64 bpf = amrparse->bytecount / amrparse->framecount;
+ gboolean qres = FALSE;
+ gint64 ptot;
+
+ qres = gst_pad_query_duration (peer, &pformat, &ptot);
+ gst_object_unref (GST_OBJECT (peer));
+ if (qres && bpf) {
+ gst_base_parse_set_duration (parse, GST_FORMAT_TIME,
+ AMR_FRAME_DURATION * ptot / bpf);
+ }
+ }
+}
+
+
+/**
+ * gst_amrparse_parse_header:
+ * @amrparse: #GstAmrParse
+ * @data: Header data to be parsed.
+ * @skipsize: Output argument where the frame size will be stored.
+ *
+ * Check if the given data contains an AMR mime header.
+ *
+ * Returns: TRUE on success.
+ */
+static gboolean
+gst_amrparse_parse_header (GstAmrParse * amrparse,
+ const guint8 * data, gint * skipsize)
+{
+ GST_DEBUG_OBJECT (amrparse, "Parsing header data");
+
+ if (!memcmp (data, "#!AMR-WB\n", 9)) {
+ GST_DEBUG_OBJECT (amrparse, "AMR-WB detected");
+ amrparse->block_size = block_size_wb;
+ amrparse->wide = TRUE;
+ *skipsize = amrparse->header = 9;
+ } else if (!memcmp (data, "#!AMR\n", 6)) {
+ GST_DEBUG_OBJECT (amrparse, "AMR-NB detected");
+ amrparse->block_size = block_size_nb;
+ amrparse->wide = FALSE;
+ *skipsize = amrparse->header = 6;
+ } else
+ return FALSE;
+
+ gst_amrparse_set_src_caps (amrparse);
+ return TRUE;
+}
+
+
+/**
+ * gst_amrparse_check_valid_frame:
+ * @parse: #GstBaseParse.
+ * @buffer: #GstBuffer.
+ * @framesize: Output variable where the found frame size is put.
+ * @skipsize: Output variable which tells how much data needs to be skipped
+ * until a frame header is found.
+ *
+ * Implementation of "check_valid_frame" vmethod in #GstBaseParse class.
+ *
+ * Returns: TRUE if the given data contains valid frame.
+ */
+gboolean
+gst_amrparse_check_valid_frame (GstBaseParse * parse,
+ GstBuffer * buffer, guint * framesize, gint * skipsize)
+{
+ const guint8 *data;
+ gint fsize, mode, dsize;
+ GstAmrParse *amrparse;
+
+ amrparse = GST_AMRPARSE (parse);
+ data = GST_BUFFER_DATA (buffer);
+ dsize = GST_BUFFER_SIZE (buffer);
+
+ GST_LOG ("buffer: %d bytes", dsize);
+
+ if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
+ /* Discontinuous stream -> drop the sync */
+ amrparse->sync = FALSE;
+ }
+
+ if (amrparse->need_header) {
+ if (dsize >= AMR_MIME_HEADER_SIZE &&
+ gst_amrparse_parse_header (amrparse, data, skipsize)) {
+ amrparse->need_header = FALSE;
+ } else {
+ GST_WARNING ("media doesn't look like a AMR format");
+ }
+ /* We return FALSE, so this frame won't get pushed forward. Instead,
+ the "skip" value is set, so next time we will receive a valid frame. */
+ return FALSE;
+ }
+
+ /* Does this look like a possible frame header candidate? */
+ if ((data[0] & 0x83) == 0) {
+ /* Yep. Retrieve the frame size */
+ mode = (data[0] >> 3) & 0x0F;
+ fsize = amrparse->block_size[mode] + 1; /* +1 for the header byte */
+
+ /* We recognize this data as a valid frame when:
+ * - We are in sync. There is no need for extra checks then
+ * - We are in EOS. There might not be enough data to check next frame
+ * - Sync is lost, but the following data after this frame seem
+ * to contain a valid header as well (and there is enough data to
+ * perform this check)
+ */
+ if (amrparse->sync || amrparse->eos ||
+ (dsize >= fsize && (data[fsize] & 0x83) == 0)) {
+ amrparse->sync = TRUE;
+ *framesize = fsize;
+ return TRUE;
+ }
+ }
+
+ GST_LOG ("sync lost");
+ amrparse->sync = FALSE;
+ return FALSE;
+}
+
+
+/**
+ * gst_amrparse_parse_frame:
+ * @parse: #GstBaseParse.
+ * @buffer: #GstBuffer.
+ *
+ * Implementation of "parse" vmethod in #GstBaseParse class.
+ *
+ * Returns: #GstFlowReturn defining the parsing status.
+ */
+GstFlowReturn
+gst_amrparse_parse_frame (GstBaseParse * parse, GstBuffer * buffer)
+{
+ GstAmrParse *amrparse;
+
+ amrparse = GST_AMRPARSE (parse);
+
+ if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
+ gint64 btime;
+ gboolean r = gst_amrparse_convert (parse, GST_FORMAT_BYTES,
+ GST_BUFFER_OFFSET (buffer),
+ GST_FORMAT_TIME, &btime);
+ if (r) {
+ /* FIXME: What to do if the conversion fails? */
+ amrparse->ts = btime;
+ }
+ }
+
+ GST_BUFFER_DURATION (buffer) = AMR_FRAME_DURATION;
+ GST_BUFFER_TIMESTAMP (buffer) = amrparse->ts;
+
+ if (GST_CLOCK_TIME_IS_VALID (amrparse->ts)) {
+ amrparse->ts += AMR_FRAME_DURATION;
+ }
+
+ if (!(++amrparse->framecount % 50)) {
+ gst_amrparse_update_duration (amrparse);
+ }
+ amrparse->bytecount += GST_BUFFER_SIZE (buffer);
+
+ gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
+ return GST_FLOW_OK;
+}
+
+
+/**
+ * gst_amrparse_start:
+ * @parse: #GstBaseParse.
+ *
+ * Implementation of "start" vmethod in #GstBaseParse class.
+ *
+ * Returns: TRUE on success.
+ */
+gboolean
+gst_amrparse_start (GstBaseParse * parse)
+{
+ GstAmrParse *amrparse;
+
+ amrparse = GST_AMRPARSE (parse);
+ GST_DEBUG ("start");
+ amrparse->need_header = TRUE;
+ amrparse->header = 0;
+ amrparse->sync = TRUE;
+ amrparse->eos = FALSE;
+ amrparse->framecount = 0;
+ amrparse->bytecount = 0;
+ amrparse->ts = 0;
+ return TRUE;
+}
+
+
+/**
+ * gst_amrparse_stop:
+ * @parse: #GstBaseParse.
+ *
+ * Implementation of "stop" vmethod in #GstBaseParse class.
+ *
+ * Returns: TRUE on success.
+ */
+gboolean
+gst_amrparse_stop (GstBaseParse * parse)
+{
+ GstAmrParse *amrparse;
+
+ amrparse = GST_AMRPARSE (parse);
+ GST_DEBUG ("stop");
+ amrparse->need_header = TRUE;
+ amrparse->header = 0;
+ amrparse->ts = -1;
+ return TRUE;
+}
+
+
+/**
+ * gst_amrparse_event:
+ * @parse: #GstBaseParse.
+ * @event: #GstEvent.
+ *
+ * Implementation of "event" vmethod in #GstBaseParse class.
+ *
+ * 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: %" G_GINT64_FORMAT " 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 %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
+ 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;
+}
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