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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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387 lines
11 KiB
C
387 lines
11 KiB
C
/* GStreamer
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* Copyright (C) 2004 Wim Taymans <wim@fluendo.com>
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* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
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* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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* Copyright (C) <2011-2012> Vincent Penquerc'h <vincent.penquerch@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-opusparse
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* @see_also: opusenc, opusdec
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*
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* This element parses OPUS packets.
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*
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* <refsect2>
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* <title>Example pipelines</title>
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* |[
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* gst-launch -v filesrc location=opusdata ! opusparse ! opusdec ! audioconvert ! audioresample ! alsasink
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* ]| Decode and plays an unmuxed Opus file.
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* </refsect2>
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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 <string.h>
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#include <opus/opus.h>
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#include "gstopusheader.h"
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#include "gstopusparse.h"
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GST_DEBUG_CATEGORY_STATIC (opusparse_debug);
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#define GST_CAT_DEFAULT opusparse_debug
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#define MAX_PAYLOAD_BYTES 1500
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static GstStaticPadTemplate opus_parse_src_factory =
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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/x-opus, framed = (boolean) true")
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);
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static GstStaticPadTemplate opus_parse_sink_factory =
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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-opus")
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);
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G_DEFINE_TYPE (GstOpusParse, gst_opus_parse, GST_TYPE_BASE_PARSE);
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static gboolean gst_opus_parse_start (GstBaseParse * parse);
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static gboolean gst_opus_parse_stop (GstBaseParse * parse);
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static GstFlowReturn gst_opus_parse_handle_frame (GstBaseParse * base,
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GstBaseParseFrame * frame, gint * skip);
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static GstFlowReturn gst_opus_parse_parse_frame (GstBaseParse * base,
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GstBaseParseFrame * frame);
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static void
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gst_opus_parse_class_init (GstOpusParseClass * klass)
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{
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GstBaseParseClass *bpclass;
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GstElementClass *element_class;
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bpclass = (GstBaseParseClass *) klass;
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element_class = (GstElementClass *) klass;
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bpclass->start = GST_DEBUG_FUNCPTR (gst_opus_parse_start);
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bpclass->stop = GST_DEBUG_FUNCPTR (gst_opus_parse_stop);
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bpclass->handle_frame = GST_DEBUG_FUNCPTR (gst_opus_parse_handle_frame);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&opus_parse_src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&opus_parse_sink_factory));
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gst_element_class_set_static_metadata (element_class, "Opus audio parser",
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"Codec/Parser/Audio",
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"parses opus audio streams",
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"Vincent Penquerc'h <vincent.penquerch@collabora.co.uk>");
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GST_DEBUG_CATEGORY_INIT (opusparse_debug, "opusparse", 0,
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"opus parsing element");
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}
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static void
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gst_opus_parse_init (GstOpusParse * parse)
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{
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parse->header_sent = FALSE;
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}
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static gboolean
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gst_opus_parse_start (GstBaseParse * base)
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{
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GstOpusParse *parse = GST_OPUS_PARSE (base);
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GstCaps *caps;
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caps = gst_caps_new_empty_simple ("audio/x-opus");
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gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (GST_BASE_PARSE (parse)), caps);
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gst_caps_unref (caps);
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parse->header_sent = FALSE;
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parse->next_ts = 0;
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return TRUE;
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}
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static gboolean
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gst_opus_parse_stop (GstBaseParse * base)
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{
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GstOpusParse *parse = GST_OPUS_PARSE (base);
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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;
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parse->header_sent = FALSE;
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return TRUE;
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}
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static GstFlowReturn
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gst_opus_parse_handle_frame (GstBaseParse * base,
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GstBaseParseFrame * frame, gint * skip)
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{
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GstOpusParse *parse;
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guint8 *data;
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gsize size;
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guint32 packet_size;
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int ret = FALSE;
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const unsigned char *frames[48];
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unsigned char toc;
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short frame_sizes[48];
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int payload_offset;
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int packet_offset = 0;
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gboolean is_header, is_idheader, is_commentheader;
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GstMapInfo map;
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parse = GST_OPUS_PARSE (base);
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*skip = -1;
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gst_buffer_map (frame->buffer, &map, GST_MAP_READ);
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data = map.data;
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size = map.size;
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GST_DEBUG_OBJECT (parse,
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"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);
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is_commentheader = gst_opus_header_is_comment_header (frame->buffer);
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is_header = is_idheader || is_commentheader;
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if (!is_header) {
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int nframes;
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/* Next, check if there's an Opus packet there */
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nframes =
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opus_packet_parse (data, size, &toc, frames, frame_sizes,
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&payload_offset);
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if (nframes < 0) {
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/* Then, check for the test vector framing */
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GST_DEBUG_OBJECT (parse,
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"No Opus packet found, trying test vector framing");
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if (size < 4) {
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GST_DEBUG_OBJECT (parse, "Too small");
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goto beach;
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}
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packet_size = GST_READ_UINT32_BE (data);
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GST_DEBUG_OBJECT (parse, "Packet size: %u bytes", packet_size);
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if (packet_size > MAX_PAYLOAD_BYTES) {
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GST_DEBUG_OBJECT (parse, "Too large");
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goto beach;
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}
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if (packet_size > size - 4) {
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GST_DEBUG_OBJECT (parse, "Truncated");
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goto beach;
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}
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nframes =
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opus_packet_parse (data + 8, packet_size, &toc, frames, frame_sizes,
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&payload_offset);
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if (nframes < 0) {
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GST_DEBUG_OBJECT (parse, "No test vector framing either");
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goto beach;
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}
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packet_offset = 8;
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data += packet_offset;
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/* for ad hoc framing, heed the framing, so we eat any padding */
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payload_offset = packet_size;
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}
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}
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if (is_header) {
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*skip = 0;
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} else {
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*skip = packet_offset;
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size = payload_offset;
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}
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GST_DEBUG_OBJECT (parse,
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"Got Opus packet at offset %d, %" G_GSIZE_FORMAT " bytes", *skip, size);
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ret = TRUE;
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beach:
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gst_buffer_unmap (frame->buffer, &map);
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/* convert old style result to new one */
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if (!ret) {
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if (*skip < 0)
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*skip = 1;
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return GST_FLOW_OK;
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}
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/* always skip first if needed */
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if (*skip > 0)
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return GST_FLOW_OK;
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/* normalize again */
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if (*skip < 0)
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*skip = 0;
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/* not enough */
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if (size > map.size)
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return GST_FLOW_OK;
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/* FIXME some day ... should not mess with buffer itself */
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if (!parse->header_sent) {
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gst_buffer_replace (&frame->buffer,
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gst_buffer_copy_region (frame->buffer, GST_BUFFER_COPY_ALL, 0, size));
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gst_buffer_unref (frame->buffer);
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}
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ret = gst_opus_parse_parse_frame (base, frame);
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if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
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frame->flags |= GST_BASE_PARSE_FRAME_FLAG_DROP;
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ret = GST_FLOW_OK;
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}
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if (ret == GST_FLOW_OK)
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ret = gst_base_parse_finish_frame (base, frame, size);
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return ret;
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}
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/* Adapted copy of the one in gstoggstream.c... */
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static guint64
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packet_duration_opus (const guint8 * data, size_t len)
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{
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static const guint64 durations[32] = {
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10000, 20000, 40000, 60000, /* Silk NB */
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10000, 20000, 40000, 60000, /* Silk MB */
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10000, 20000, 40000, 60000, /* Silk WB */
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10000, 20000, /* Hybrid SWB */
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10000, 20000, /* Hybrid FB */
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2500, 5000, 10000, 20000, /* CELT NB */
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2500, 5000, 10000, 20000, /* CELT NB */
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2500, 5000, 10000, 20000, /* CELT NB */
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2500, 5000, 10000, 20000, /* CELT NB */
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};
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gint64 duration;
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gint64 frame_duration;
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gint nframes;
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guint8 toc;
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if (len < 1)
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return 0;
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toc = data[0];
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frame_duration = durations[toc >> 3] * 1000;
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switch (toc & 3) {
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case 0:
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nframes = 1;
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break;
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case 1:
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nframes = 2;
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break;
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case 2:
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nframes = 2;
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break;
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case 3:
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if (len < 2) {
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GST_WARNING ("Code 3 Opus packet has less than 2 bytes");
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return 0;
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}
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nframes = data[1] & 63;
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break;
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}
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duration = nframes * frame_duration;
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if (duration > 120 * GST_MSECOND) {
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GST_WARNING ("Opus packet duration > 120 ms, invalid");
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return 0;
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}
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GST_LOG ("Opus packet: frame size %.1f ms, %d frames, duration %.1f ms",
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frame_duration / 1000000.f, nframes, duration / 1000000.f);
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return duration;
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}
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static GstFlowReturn
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gst_opus_parse_parse_frame (GstBaseParse * base, GstBaseParseFrame * frame)
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{
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guint64 duration;
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GstOpusParse *parse;
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gboolean is_idheader, is_commentheader;
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GstMapInfo map;
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parse = GST_OPUS_PARSE (base);
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is_idheader = gst_opus_header_is_id_header (frame->buffer);
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is_commentheader = gst_opus_header_is_comment_header (frame->buffer);
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if (!parse->header_sent) {
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GstCaps *caps;
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guint8 channels;
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/* Opus streams can decode to 1 or 2 channels, so use the header
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value if we have one, or 2 otherwise */
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if (is_idheader) {
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gst_buffer_replace (&parse->id_header, frame->buffer);
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GST_DEBUG_OBJECT (parse, "Found ID header, keeping");
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return GST_BASE_PARSE_FLOW_DROPPED;
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} else if (is_commentheader) {
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gst_buffer_replace (&parse->comment_header, frame->buffer);
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GST_DEBUG_OBJECT (parse, "Found comment header, keeping");
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return GST_BASE_PARSE_FLOW_DROPPED;
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}
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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;
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if (parse->id_header && parse->comment_header) {
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gst_opus_header_create_caps_from_headers (&caps, &parse->headers,
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parse->id_header, parse->comment_header);
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} else {
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guint8 channel_mapping_family, channel_mapping[256];
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GST_INFO_OBJECT (parse,
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"No headers, blindly setting up canonical stereo");
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channels = 2;
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channel_mapping_family = 0;
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channel_mapping[0] = 0;
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channel_mapping[1] = 1;
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gst_opus_header_create_caps (&caps, &parse->headers, channels, 1, 0,
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channel_mapping_family, channel_mapping, NULL);
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}
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gst_buffer_replace (&parse->id_header, NULL);
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gst_buffer_replace (&parse->comment_header, NULL);
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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;
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}
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GST_BUFFER_TIMESTAMP (frame->buffer) = parse->next_ts;
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gst_buffer_map (frame->buffer, &map, GST_MAP_READ);
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duration = packet_duration_opus (map.data, map.size);
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gst_buffer_unmap (frame->buffer, &map);
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parse->next_ts += duration;
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GST_BUFFER_DURATION (frame->buffer) = duration;
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GST_BUFFER_OFFSET_END (frame->buffer) =
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gst_util_uint64_scale (parse->next_ts, 48000, GST_SECOND);
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GST_BUFFER_OFFSET (frame->buffer) = parse->next_ts;
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return GST_FLOW_OK;
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}
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