gstreamer/ext/opus/gstopusparse.c

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/* GStreamer
* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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:element-opusparse
* @see_also: opusenc, opusdec
*
* This element parses OPUS packets.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch -v filesrc location=opusdata ! opusparse ! opusdec ! audioconvert ! audioresample ! alsasink
* ]| Decode and plays an unmuxed Opus file.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#include <string.h>
#include <opus/opus.h>
#include "gstopusheader.h"
#include "gstopusparse.h"
GST_DEBUG_CATEGORY_STATIC (opusparse_debug);
#define GST_CAT_DEFAULT opusparse_debug
#define MAX_PAYLOAD_BYTES 1500
static GstStaticPadTemplate opus_parse_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-opus, framed = (boolean) true")
);
static GstStaticPadTemplate opus_parse_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-opus")
);
G_DEFINE_TYPE (GstOpusParse, gst_opus_parse, GST_TYPE_BASE_PARSE);
static gboolean gst_opus_parse_start (GstBaseParse * parse);
static gboolean gst_opus_parse_stop (GstBaseParse * parse);
static gboolean gst_opus_parse_check_valid_frame (GstBaseParse * base,
GstBaseParseFrame * frame, guint * frame_size, gint * skip);
static GstFlowReturn gst_opus_parse_parse_frame (GstBaseParse * base,
GstBaseParseFrame * frame);
static void
gst_opus_parse_class_init (GstOpusParseClass * klass)
{
GstBaseParseClass *bpclass;
GstElementClass *element_class;
bpclass = (GstBaseParseClass *) klass;
element_class = (GstElementClass *) klass;
bpclass->start = GST_DEBUG_FUNCPTR (gst_opus_parse_start);
bpclass->stop = GST_DEBUG_FUNCPTR (gst_opus_parse_stop);
bpclass->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_opus_parse_check_valid_frame);
bpclass->parse_frame = GST_DEBUG_FUNCPTR (gst_opus_parse_parse_frame);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&opus_parse_src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&opus_parse_sink_factory));
gst_element_class_set_details_simple (element_class, "Opus audio parser",
"Codec/Parser/Audio",
"parses opus audio streams",
"Vincent Penquerc'h <vincent.penquerch@collabora.co.uk>");
GST_DEBUG_CATEGORY_INIT (opusparse_debug, "opusparse", 0,
"opus parsing element");
}
static void
gst_opus_parse_init (GstOpusParse * parse)
{
parse->header_sent = FALSE;
}
static gboolean
gst_opus_parse_start (GstBaseParse * base)
{
GstOpusParse *parse = GST_OPUS_PARSE (base);
parse->header_sent = FALSE;
parse->next_ts = 0;
return TRUE;
}
static gboolean
gst_opus_parse_stop (GstBaseParse * base)
{
GstOpusParse *parse = GST_OPUS_PARSE (base);
g_slist_foreach (parse->headers, (GFunc) gst_buffer_unref, NULL);
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g_slist_free (parse->headers);
parse->headers = NULL;
parse->header_sent = FALSE;
return TRUE;
}
static gboolean
gst_opus_parse_check_valid_frame (GstBaseParse * base,
GstBaseParseFrame * frame, guint * frame_size, gint * skip)
{
GstOpusParse *parse;
guint8 *data;
gsize size;
guint32 packet_size;
int ret = FALSE;
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const unsigned char *frames[48];
unsigned char toc;
short frame_sizes[48];
int payload_offset;
int nframes;
int packet_offset = 0;
gboolean is_header, is_idheader, is_commentheader;
parse = GST_OPUS_PARSE (base);
data = GST_BUFFER_DATA (frame->buffer);
size = GST_BUFFER_SIZE (frame->buffer);
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GST_DEBUG_OBJECT (parse,
"Checking for frame, %" G_GSIZE_FORMAT " bytes in buffer", size);
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/* check for headers */
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is_idheader = gst_opus_header_is_id_header (frame->buffer);
is_commentheader = gst_opus_header_is_comment_header (frame->buffer);
is_header = is_idheader || is_commentheader;
if (!is_header) {
/* Next, check if there's an Opus packet there */
nframes =
opus_packet_parse (data, size, &toc, frames, frame_sizes,
&payload_offset);
}
if (!is_header && nframes < 0) {
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/* Then, check for the test vector framing */
GST_DEBUG_OBJECT (parse,
"No Opus packet found, trying test vector framing");
if (size < 4) {
GST_DEBUG_OBJECT (parse, "Too small");
goto beach;
}
packet_size = GST_READ_UINT32_BE (data);
GST_DEBUG_OBJECT (parse, "Packet size: %u bytes", packet_size);
if (packet_size > MAX_PAYLOAD_BYTES) {
GST_DEBUG_OBJECT (parse, "Too large");
goto beach;
}
if (packet_size > size - 4) {
GST_DEBUG_OBJECT (parse, "Truncated");
goto beach;
}
nframes =
opus_packet_parse (data + 8, packet_size, &toc, frames, frame_sizes,
&payload_offset);
if (nframes < 0) {
GST_DEBUG_OBJECT (parse, "No test vector framing either");
goto beach;
}
packet_offset = 8;
data += packet_offset;
}
if (is_header) {
*skip = 0;
*frame_size = size;
} else {
*skip = packet_offset;
*frame_size = payload_offset;
}
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GST_DEBUG_OBJECT (parse, "Got Opus packet at offset %d, %d bytes", *skip,
*frame_size);
ret = TRUE;
beach:
return ret;
}
/* Adapted copy of the one in gstoggstream.c... */
static guint64
packet_duration_opus (const guint8 * data, size_t len)
{
static const guint64 durations[32] = {
10000, 20000, 40000, 60000, /* Silk NB */
10000, 20000, 40000, 60000, /* Silk MB */
10000, 20000, 40000, 60000, /* Silk WB */
10000, 20000, /* Hybrid SWB */
10000, 20000, /* Hybrid FB */
2500, 5000, 10000, 20000, /* CELT NB */
2500, 5000, 10000, 20000, /* CELT NB */
2500, 5000, 10000, 20000, /* CELT NB */
2500, 5000, 10000, 20000, /* CELT NB */
};
gint64 duration;
gint64 frame_duration;
gint nframes;
guint8 toc;
if (len < 1)
return 0;
toc = data[0];
frame_duration = durations[toc >> 3] * 1000;
switch (toc & 3) {
case 0:
nframes = 1;
break;
case 1:
nframes = 2;
break;
case 2:
nframes = 2;
break;
case 3:
if (len < 2) {
GST_WARNING ("Code 3 Opus packet has less than 2 bytes");
return 0;
}
nframes = data[1] & 63;
break;
}
duration = nframes * frame_duration;
if (duration > 120 * GST_MSECOND) {
GST_WARNING ("Opus packet duration > 120 ms, invalid");
return 0;
}
GST_LOG ("Opus packet: frame size %.1f ms, %d frames, duration %.1f ms",
frame_duration / 1000000.f, nframes, duration / 1000000.f);
return duration;
}
static GstFlowReturn
gst_opus_parse_parse_frame (GstBaseParse * base, GstBaseParseFrame * frame)
{
guint64 duration;
GstOpusParse *parse;
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gboolean is_idheader, is_commentheader;
parse = GST_OPUS_PARSE (base);
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is_idheader = gst_opus_header_is_id_header (frame->buffer);
is_commentheader = gst_opus_header_is_comment_header (frame->buffer);
if (!parse->header_sent) {
GstCaps *caps;
guint8 channels;
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/* Opus streams can decode to 1 or 2 channels, so use the header
value if we have one, or 2 otherwise */
if (is_idheader) {
gst_buffer_replace (&parse->id_header, frame->buffer);
GST_DEBUG_OBJECT (parse, "Found ID header, keeping");
return GST_BASE_PARSE_FLOW_DROPPED;
} else if (is_commentheader) {
gst_buffer_replace (&parse->comment_header, frame->buffer);
GST_DEBUG_OBJECT (parse, "Found comment header, keeping");
return GST_BASE_PARSE_FLOW_DROPPED;
}
g_slist_foreach (parse->headers, (GFunc) gst_buffer_unref, NULL);
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g_slist_free (parse->headers);
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parse->headers = NULL;
if (parse->id_header && parse->comment_header) {
gst_opus_header_create_caps_from_headers (&caps, &parse->headers,
parse->id_header, parse->comment_header);
} else {
guint8 channel_mapping_family, channel_mapping[256];
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GST_INFO_OBJECT (parse,
"No headers, blindly setting up canonical stereo");
channels = 2;
channel_mapping_family = 0;
channel_mapping[0] = 0;
channel_mapping[1] = 1;
gst_opus_header_create_caps (&caps, &parse->headers, channels, 1, 0,
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channel_mapping_family, channel_mapping, NULL);
}
gst_buffer_replace (&parse->id_header, NULL);
gst_buffer_replace (&parse->comment_header, NULL);
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
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gst_caps_unref (caps);
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parse->header_sent = TRUE;
}
GST_BUFFER_TIMESTAMP (frame->buffer) = parse->next_ts;
duration =
packet_duration_opus (GST_BUFFER_DATA (frame->buffer),
GST_BUFFER_SIZE (frame->buffer));
parse->next_ts += duration;
GST_BUFFER_DURATION (frame->buffer) = duration;
GST_BUFFER_OFFSET_END (frame->buffer) =
gst_util_uint64_scale (parse->next_ts, 48000, GST_SECOND);
GST_BUFFER_OFFSET (frame->buffer) = parse->next_ts;
return GST_FLOW_OK;
}