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1c89488c50
... and adjust subclass parsers accordingly
417 lines
13 KiB
C
417 lines
13 KiB
C
/* GStreamer DCA parser
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* Copyright (C) 2010 Tim-Philipp Müller <tim centricular net>
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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:element-dcaparse
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* @short_description: DCA (DTS Coherent Acoustics) parser
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* @see_also: #GstAmrParse, #GstAACParse, #GstAc3Parse
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*
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* This is a DCA (DTS Coherent Acoustics) parser.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch filesrc location=abc.dts ! dcaparse ! dtsdec ! audioresample ! audioconvert ! autoaudiosink
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* ]|
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* </refsect2>
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*/
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/* TODO:
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* - should accept framed and unframed input (needs decodebin fixes first)
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* - seeking in raw .dts files doesn't seem to work, but duration estimate ok
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*
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* - if frames have 'odd' durations, the frame durations (plus timestamps)
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* aren't adjusted up occasionally to make up for rounding error gaps.
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* (e.g. if 512 samples per frame @ 48kHz = 10.666666667 ms/frame)
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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 "gstdcaparse.h"
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#include <gst/base/gstbytereader.h>
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#include <gst/base/gstbitreader.h>
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GST_DEBUG_CATEGORY_STATIC (dca_parse_debug);
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#define GST_CAT_DEFAULT dca_parse_debug
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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/x-dts, framed = (boolean) true, "
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" channels = (int) [ 1, 8 ], rate = (int) [ 8000, 192000 ]"));
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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-dts, framed = (boolean) false"));
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static void gst_dca_parse_finalize (GObject * object);
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static gboolean gst_dca_parse_start (GstBaseParse * parse);
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static gboolean gst_dca_parse_stop (GstBaseParse * parse);
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static gboolean gst_dca_parse_check_valid_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame, guint * size, gint * skipsize);
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static GstFlowReturn gst_dca_parse_parse_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame);
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GST_BOILERPLATE (GstDcaParse, gst_dca_parse, GstBaseParse, GST_TYPE_BASE_PARSE);
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static void
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gst_dca_parse_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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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_simple (element_class,
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"DTS Coherent Acoustics audio stream parser", "Codec/Parser/Audio",
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"DCA parser", "Tim-Philipp Müller <tim centricular net>");
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}
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static void
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gst_dca_parse_class_init (GstDcaParseClass * klass)
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{
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GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GST_DEBUG_CATEGORY_INIT (dca_parse_debug, "dcaparse", 0,
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"DCA audio stream parser");
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object_class->finalize = gst_dca_parse_finalize;
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parse_class->start = GST_DEBUG_FUNCPTR (gst_dca_parse_start);
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parse_class->stop = GST_DEBUG_FUNCPTR (gst_dca_parse_stop);
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parse_class->check_valid_frame =
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GST_DEBUG_FUNCPTR (gst_dca_parse_check_valid_frame);
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parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_dca_parse_parse_frame);
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}
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static void
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gst_dca_parse_reset (GstDcaParse * dcaparse)
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{
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dcaparse->channels = -1;
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dcaparse->rate = -1;
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dcaparse->last_sync = 0;
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}
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static void
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gst_dca_parse_init (GstDcaParse * dcaparse, GstDcaParseClass * klass)
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{
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gst_base_parse_set_min_frame_size (GST_BASE_PARSE (dcaparse),
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DCA_MIN_FRAMESIZE);
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gst_dca_parse_reset (dcaparse);
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}
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static void
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gst_dca_parse_finalize (GObject * object)
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{
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_dca_parse_start (GstBaseParse * parse)
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{
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GstDcaParse *dcaparse = GST_DCA_PARSE (parse);
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GST_DEBUG_OBJECT (parse, "starting");
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gst_dca_parse_reset (dcaparse);
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return TRUE;
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}
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static gboolean
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gst_dca_parse_stop (GstBaseParse * parse)
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{
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GST_DEBUG_OBJECT (parse, "stopping");
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return TRUE;
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}
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static gboolean
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gst_dca_parse_parse_header (GstDcaParse * dcaparse,
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const GstByteReader * reader, guint * frame_size,
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guint * sample_rate, guint * channels, guint * samples)
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{
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static const int sample_rates[16] = { 0, 8000, 16000, 32000, 0, 0, 11025,
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22050, 44100, 0, 0, 12000, 24000, 48000, 96000, 192000
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};
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static const guint8 channels_table[16] = { 1, 2, 2, 2, 2, 3, 3, 4, 4, 5,
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6, 6, 6, 7, 8, 8
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};
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GstByteReader r = *reader;
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guint16 hdr[8];
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guint32 marker;
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guint num_blocks, samples_per_block, chans, lfe, i;
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if (gst_byte_reader_get_remaining (&r) < (4 + sizeof (hdr)))
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return FALSE;
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marker = gst_byte_reader_peek_uint32_be_unchecked (&r);
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/* raw big endian or 14-bit big endian */
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if (marker == 0x7FFE8001 || marker == 0x1FFFE800) {
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for (i = 0; i < G_N_ELEMENTS (hdr); ++i)
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hdr[i] = gst_byte_reader_get_uint16_be_unchecked (&r);
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} else
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/* raw little endian or 14-bit little endian */
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if (marker == 0xFE7F0180 || marker == 0xFF1F00E8) {
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for (i = 0; i < G_N_ELEMENTS (hdr); ++i)
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hdr[i] = gst_byte_reader_get_uint16_le_unchecked (&r);
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} else {
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return FALSE;
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}
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GST_LOG_OBJECT (dcaparse, "dts sync marker 0x%08x at offset %u", marker,
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gst_byte_reader_get_pos (reader));
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/* 14-bit mode */
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if (marker == 0x1FFFE800 || marker == 0xFF1F00E8) {
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if ((hdr[2] & 0xFFF0) != 0x07F0)
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return FALSE;
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/* discard top 2 bits (2 void), shift in 2 */
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hdr[0] = (hdr[0] << 2) | ((hdr[1] >> 12) & 0x0003);
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/* discard top 4 bits (2 void, 2 shifted into hdr[0]), shift in 4 etc. */
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hdr[1] = (hdr[1] << 4) | ((hdr[2] >> 10) & 0x000F);
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hdr[2] = (hdr[2] << 6) | ((hdr[3] >> 8) & 0x003F);
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hdr[3] = (hdr[3] << 8) | ((hdr[4] >> 6) & 0x00FF);
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hdr[4] = (hdr[4] << 10) | ((hdr[5] >> 4) & 0x03FF);
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hdr[5] = (hdr[5] << 12) | ((hdr[6] >> 2) & 0x0FFF);
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hdr[6] = (hdr[6] << 14) | ((hdr[7] >> 0) & 0x3FFF);
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g_assert (hdr[0] == 0x7FFE && hdr[1] == 0x8001);
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}
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GST_LOG_OBJECT (dcaparse, "frame header: %04x%04x%04x%04x",
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hdr[2], hdr[3], hdr[4], hdr[5]);
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samples_per_block = ((hdr[2] >> 10) & 0x1f) + 1;
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num_blocks = ((hdr[2] >> 2) & 0x7F) + 1;
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*frame_size = (((hdr[2] & 0x03) << 12) | (hdr[3] >> 4)) + 1;
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chans = ((hdr[3] & 0x0F) << 2) | (hdr[4] >> 14);
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*sample_rate = sample_rates[(hdr[4] >> 10) & 0x0F];
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lfe = (hdr[5] >> 9) & 0x03;
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GST_TRACE_OBJECT (dcaparse, "frame size %u, num_blocks %u, rate %u, "
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"samples per block %u", *frame_size, num_blocks, *sample_rate,
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samples_per_block);
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if (num_blocks < 6 || *frame_size < 96 || *sample_rate == 0)
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return FALSE;
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if (marker == 0x1FFFE800 || marker == 0xFF1F00E8)
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*frame_size = (*frame_size * 16) / 14; /* FIXME: round up? */
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if (chans < G_N_ELEMENTS (channels_table))
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*channels = channels_table[chans] + ((lfe) ? 1 : 0);
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else
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*channels = 0;
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*samples = num_blocks * samples_per_block;
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GST_TRACE_OBJECT (dcaparse, "frame size %u, channels %u, rate %u, samples %u",
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*frame_size, *channels, *sample_rate, *samples);
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return TRUE;
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}
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static gint
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gst_dca_parse_find_sync (GstDcaParse * dcaparse, GstByteReader * reader,
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const GstBuffer * buf, guint32 * sync)
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{
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guint32 best_sync = 0;
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guint best_offset = G_MAXUINT;
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gint off;
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/* FIXME: verify syncs via _parse_header() here already */
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/* Raw little endian */
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off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0xfe7f0180,
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0, GST_BUFFER_SIZE (buf));
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if (off >= 0 && off < best_offset) {
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best_offset = off;
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best_sync = 0xfe7f0180;
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}
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/* Raw big endian */
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off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x7ffe8001,
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0, GST_BUFFER_SIZE (buf));
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if (off >= 0 && off < best_offset) {
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best_offset = off;
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best_sync = 0x7ffe8001;
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}
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/* FIXME: check next 2 bytes as well for 14-bit formats (but then don't
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* forget to adjust the *skipsize= in _check_valid_frame() */
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/* 14-bit little endian */
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off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0xff1f00e8,
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0, GST_BUFFER_SIZE (buf));
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if (off >= 0 && off < best_offset) {
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best_offset = off;
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best_sync = 0xff1f00e8;
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}
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/* 14-bit big endian */
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off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x1fffe800,
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0, GST_BUFFER_SIZE (buf));
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if (off >= 0 && off < best_offset) {
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best_offset = off;
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best_sync = 0x1fffe800;
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}
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if (best_offset == G_MAXUINT)
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return -1;
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*sync = best_sync;
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return best_offset;
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}
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static gboolean
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gst_dca_parse_check_valid_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
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{
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GstDcaParse *dcaparse = GST_DCA_PARSE (parse);
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GstBuffer *buf = frame->buffer;
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GstByteReader r = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
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gboolean parser_draining;
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gboolean parser_in_sync;
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guint32 sync = 0;
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guint size, rate, chans, samples;
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gint off = -1;
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if (G_UNLIKELY (GST_BUFFER_SIZE (buf) < 16))
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return FALSE;
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parser_in_sync = GST_BASE_PARSE_FRAME_SYNC (frame);
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if (G_LIKELY (parser_in_sync && dcaparse->last_sync != 0)) {
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off = gst_byte_reader_masked_scan_uint32 (&r, 0xffffffff,
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dcaparse->last_sync, 0, GST_BUFFER_SIZE (buf));
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}
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if (G_UNLIKELY (off < 0)) {
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off = gst_dca_parse_find_sync (dcaparse, &r, buf, &sync);
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}
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/* didn't find anything that looks like a sync word, skip */
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if (off < 0) {
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*skipsize = GST_BUFFER_SIZE (buf) - 3;
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GST_DEBUG_OBJECT (dcaparse, "no sync, skipping %d bytes", *skipsize);
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return FALSE;
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}
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GST_LOG_OBJECT (parse, "possible sync %08x at buffer offset %d", sync, off);
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/* possible frame header, but not at offset 0? skip bytes before sync */
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if (off > 0) {
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*skipsize = off;
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return FALSE;
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}
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/* make sure the values in the frame header look sane */
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if (!gst_dca_parse_parse_header (dcaparse, &r, &size, &rate, &chans,
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&samples)) {
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*skipsize = 4;
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return FALSE;
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}
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GST_LOG_OBJECT (parse, "got frame, sync %08x, size %u, rate %d, channels %d",
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sync, size, rate, chans);
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*framesize = size;
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dcaparse->last_sync = sync;
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parser_draining = GST_BASE_PARSE_FRAME_DRAIN (frame);
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if (!parser_in_sync && !parser_draining) {
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/* check for second frame to be sure */
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GST_DEBUG_OBJECT (dcaparse, "resyncing; checking next frame syncword");
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if (GST_BUFFER_SIZE (buf) >= (size + 16)) {
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guint s2, r2, c2, n2;
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GST_MEMDUMP ("buf", GST_BUFFER_DATA (buf), size + 16);
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gst_byte_reader_init_from_buffer (&r, buf);
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gst_byte_reader_skip_unchecked (&r, size);
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if (!gst_dca_parse_parse_header (dcaparse, &r, &s2, &r2, &c2, &n2)) {
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GST_DEBUG_OBJECT (dcaparse, "didn't find second syncword");
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*skipsize = 4;
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return FALSE;
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}
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/* ok, got sync now, let's assume constant frame size */
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gst_base_parse_set_min_frame_size (parse, size);
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} else {
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/* FIXME: baseparse always seems to hand us buffers of min_frame_size
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* bytes, which is unhelpful here */
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GST_LOG_OBJECT (dcaparse, "next sync out of reach (%u < %u)",
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GST_BUFFER_SIZE (buf), size + 16);
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/* *skipsize = 0; */
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/* return FALSE; */
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}
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}
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return TRUE;
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}
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static GstFlowReturn
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gst_dca_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
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{
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GstDcaParse *dcaparse = GST_DCA_PARSE (parse);
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GstBuffer *buf = frame->buffer;
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GstByteReader r = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
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guint size, rate, chans, samples;
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if (!gst_dca_parse_parse_header (dcaparse, &r, &size, &rate, &chans,
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&samples))
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goto broken_header;
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if (G_UNLIKELY (dcaparse->rate != rate || dcaparse->channels != chans)) {
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GstCaps *caps;
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caps = gst_caps_new_simple ("audio/x-dts",
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"framed", G_TYPE_BOOLEAN, TRUE,
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"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, chans, NULL);
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gst_buffer_set_caps (buf, caps);
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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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dcaparse->rate = rate;
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dcaparse->channels = chans;
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gst_base_parse_set_frame_props (parse, rate, samples, 0, 0);
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}
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return GST_FLOW_OK;
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/* ERRORS */
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broken_header:
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{
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/* this really shouldn't ever happen */
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GST_ELEMENT_ERROR (parse, STREAM, DECODE, (NULL), (NULL));
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return GST_FLOW_ERROR;
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}
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}
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