1 /* GStreamer DCA parser
2 * Copyright (C) 2010 Tim-Philipp Müller <tim centricular net>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * SECTION:element-dcaparse
22 * @short_description: DCA (DTS Coherent Acoustics) parser
23 * @see_also: #GstAmrParse, #GstAACParse, #GstAc3Parse
25 * This is a DCA (DTS Coherent Acoustics) parser.
28 * <title>Example launch line</title>
30 * gst-launch filesrc location=abc.dts ! dcaparse ! dtsdec ! audioresample ! audioconvert ! autoaudiosink
36 * - should accept framed and unframed input (needs decodebin fixes first)
37 * - seeking in raw .dts files doesn't seem to work, but duration estimate ok
39 * - if frames have 'odd' durations, the frame durations (plus timestamps)
40 * aren't adjusted up occasionally to make up for rounding error gaps.
41 * (e.g. if 512 samples per frame @ 48kHz = 10.666666667 ms/frame)
50 #include "gstdcaparse.h"
51 #include <gst/base/gstbytereader.h>
52 #include <gst/base/gstbitreader.h>
54 GST_DEBUG_CATEGORY_STATIC (dca_parse_debug);
55 #define GST_CAT_DEFAULT dca_parse_debug
57 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
60 GST_STATIC_CAPS ("audio/x-dts,"
61 " framed = (boolean) true,"
62 " channels = (int) [ 1, 8 ],"
63 " rate = (int) [ 8000, 192000 ],"
64 " depth = (int) { 14, 16 },"
65 " endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }"));
67 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
70 GST_STATIC_CAPS ("audio/x-dts, framed = (boolean) false"));
72 static void gst_dca_parse_finalize (GObject * object);
74 static gboolean gst_dca_parse_start (GstBaseParse * parse);
75 static gboolean gst_dca_parse_stop (GstBaseParse * parse);
76 static gboolean gst_dca_parse_check_valid_frame (GstBaseParse * parse,
77 GstBaseParseFrame * frame, guint * size, gint * skipsize);
78 static GstFlowReturn gst_dca_parse_parse_frame (GstBaseParse * parse,
79 GstBaseParseFrame * frame);
81 GST_BOILERPLATE (GstDcaParse, gst_dca_parse, GstBaseParse, GST_TYPE_BASE_PARSE);
84 gst_dca_parse_base_init (gpointer klass)
86 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
88 gst_element_class_add_pad_template (element_class,
89 gst_static_pad_template_get (&sink_template));
90 gst_element_class_add_pad_template (element_class,
91 gst_static_pad_template_get (&src_template));
93 gst_element_class_set_details_simple (element_class,
94 "DTS Coherent Acoustics audio stream parser", "Codec/Parser/Audio",
95 "DCA parser", "Tim-Philipp Müller <tim centricular net>");
99 gst_dca_parse_class_init (GstDcaParseClass * klass)
101 GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
102 GObjectClass *object_class = G_OBJECT_CLASS (klass);
104 GST_DEBUG_CATEGORY_INIT (dca_parse_debug, "dcaparse", 0,
105 "DCA audio stream parser");
107 object_class->finalize = gst_dca_parse_finalize;
109 parse_class->start = GST_DEBUG_FUNCPTR (gst_dca_parse_start);
110 parse_class->stop = GST_DEBUG_FUNCPTR (gst_dca_parse_stop);
111 parse_class->check_valid_frame =
112 GST_DEBUG_FUNCPTR (gst_dca_parse_check_valid_frame);
113 parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_dca_parse_parse_frame);
117 gst_dca_parse_reset (GstDcaParse * dcaparse)
119 dcaparse->channels = -1;
121 dcaparse->depth = -1;
122 dcaparse->endianness = -1;
123 dcaparse->block_size = -1;
124 dcaparse->frame_size = -1;
125 dcaparse->last_sync = 0;
129 gst_dca_parse_init (GstDcaParse * dcaparse, GstDcaParseClass * klass)
131 gst_base_parse_set_min_frame_size (GST_BASE_PARSE (dcaparse),
133 gst_dca_parse_reset (dcaparse);
137 gst_dca_parse_finalize (GObject * object)
139 G_OBJECT_CLASS (parent_class)->finalize (object);
143 gst_dca_parse_start (GstBaseParse * parse)
145 GstDcaParse *dcaparse = GST_DCA_PARSE (parse);
147 GST_DEBUG_OBJECT (parse, "starting");
149 gst_dca_parse_reset (dcaparse);
155 gst_dca_parse_stop (GstBaseParse * parse)
157 GST_DEBUG_OBJECT (parse, "stopping");
163 gst_dca_parse_parse_header (GstDcaParse * dcaparse,
164 const GstByteReader * reader, guint * frame_size,
165 guint * sample_rate, guint * channels, guint * depth,
166 gint * endianness, guint * num_blocks, guint * samples_per_block,
167 gboolean * terminator)
169 static const int sample_rates[16] = { 0, 8000, 16000, 32000, 0, 0, 11025,
170 22050, 44100, 0, 0, 12000, 24000, 48000, 96000, 192000
172 static const guint8 channels_table[16] = { 1, 2, 2, 2, 2, 3, 3, 4, 4, 5,
175 GstByteReader r = *reader;
180 if (gst_byte_reader_get_remaining (&r) < (4 + sizeof (hdr)))
183 marker = gst_byte_reader_peek_uint32_be_unchecked (&r);
185 /* raw big endian or 14-bit big endian */
186 if (marker == 0x7FFE8001 || marker == 0x1FFFE800) {
187 for (i = 0; i < G_N_ELEMENTS (hdr); ++i)
188 hdr[i] = gst_byte_reader_get_uint16_be_unchecked (&r);
190 /* raw little endian or 14-bit little endian */
191 if (marker == 0xFE7F0180 || marker == 0xFF1F00E8) {
192 for (i = 0; i < G_N_ELEMENTS (hdr); ++i)
193 hdr[i] = gst_byte_reader_get_uint16_le_unchecked (&r);
198 GST_LOG_OBJECT (dcaparse, "dts sync marker 0x%08x at offset %u", marker,
199 gst_byte_reader_get_pos (reader));
202 if (marker == 0x1FFFE800 || marker == 0xFF1F00E8) {
203 if ((hdr[2] & 0xFFF0) != 0x07F0)
205 /* discard top 2 bits (2 void), shift in 2 */
206 hdr[0] = (hdr[0] << 2) | ((hdr[1] >> 12) & 0x0003);
207 /* discard top 4 bits (2 void, 2 shifted into hdr[0]), shift in 4 etc. */
208 hdr[1] = (hdr[1] << 4) | ((hdr[2] >> 10) & 0x000F);
209 hdr[2] = (hdr[2] << 6) | ((hdr[3] >> 8) & 0x003F);
210 hdr[3] = (hdr[3] << 8) | ((hdr[4] >> 6) & 0x00FF);
211 hdr[4] = (hdr[4] << 10) | ((hdr[5] >> 4) & 0x03FF);
212 hdr[5] = (hdr[5] << 12) | ((hdr[6] >> 2) & 0x0FFF);
213 hdr[6] = (hdr[6] << 14) | ((hdr[7] >> 0) & 0x3FFF);
214 g_assert (hdr[0] == 0x7FFE && hdr[1] == 0x8001);
217 GST_LOG_OBJECT (dcaparse, "frame header: %04x%04x%04x%04x",
218 hdr[2], hdr[3], hdr[4], hdr[5]);
220 *terminator = (hdr[2] & 0x80) ? FALSE : TRUE;
221 *samples_per_block = ((hdr[2] >> 10) & 0x1f) + 1;
222 *num_blocks = ((hdr[2] >> 2) & 0x7F) + 1;
223 *frame_size = (((hdr[2] & 0x03) << 12) | (hdr[3] >> 4)) + 1;
224 chans = ((hdr[3] & 0x0F) << 2) | (hdr[4] >> 14);
225 *sample_rate = sample_rates[(hdr[4] >> 10) & 0x0F];
226 lfe = (hdr[5] >> 9) & 0x03;
228 GST_TRACE_OBJECT (dcaparse, "frame size %u, num_blocks %u, rate %u, "
229 "samples per block %u", *frame_size, *num_blocks, *sample_rate,
232 if (*num_blocks < 6 || *frame_size < 96 || *sample_rate == 0)
235 if (marker == 0x1FFFE800 || marker == 0xFF1F00E8)
236 *frame_size = (*frame_size * 16) / 14; /* FIXME: round up? */
238 if (chans < G_N_ELEMENTS (channels_table))
239 *channels = channels_table[chans] + ((lfe) ? 1 : 0);
244 *depth = (marker == 0x1FFFE800 || marker == 0xFF1F00E8) ? 14 : 16;
246 *endianness = (marker == 0xFE7F0180 || marker == 0xFF1F00E8) ?
247 G_LITTLE_ENDIAN : G_BIG_ENDIAN;
249 GST_TRACE_OBJECT (dcaparse, "frame size %u, channels %u, rate %u, "
250 "num_blocks %u, samples_per_block %u", *frame_size, *channels,
251 *sample_rate, *num_blocks, *samples_per_block);
257 gst_dca_parse_find_sync (GstDcaParse * dcaparse, GstByteReader * reader,
258 const GstBuffer * buf, guint32 * sync)
260 guint32 best_sync = 0;
261 guint best_offset = G_MAXUINT;
264 /* FIXME: verify syncs via _parse_header() here already */
266 /* Raw little endian */
267 off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0xfe7f0180,
268 0, GST_BUFFER_SIZE (buf));
269 if (off >= 0 && off < best_offset) {
271 best_sync = 0xfe7f0180;
275 off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x7ffe8001,
276 0, GST_BUFFER_SIZE (buf));
277 if (off >= 0 && off < best_offset) {
279 best_sync = 0x7ffe8001;
282 /* FIXME: check next 2 bytes as well for 14-bit formats (but then don't
283 * forget to adjust the *skipsize= in _check_valid_frame() */
285 /* 14-bit little endian */
286 off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0xff1f00e8,
287 0, GST_BUFFER_SIZE (buf));
288 if (off >= 0 && off < best_offset) {
290 best_sync = 0xff1f00e8;
293 /* 14-bit big endian */
294 off = gst_byte_reader_masked_scan_uint32 (reader, 0xffffffff, 0x1fffe800,
295 0, GST_BUFFER_SIZE (buf));
296 if (off >= 0 && off < best_offset) {
298 best_sync = 0x1fffe800;
301 if (best_offset == G_MAXUINT)
309 gst_dca_parse_check_valid_frame (GstBaseParse * parse,
310 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
312 GstDcaParse *dcaparse = GST_DCA_PARSE (parse);
313 GstBuffer *buf = frame->buffer;
314 GstByteReader r = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
315 gboolean parser_draining;
316 gboolean parser_in_sync;
319 guint size, rate, chans, num_blocks, samples_per_block;
322 if (G_UNLIKELY (GST_BUFFER_SIZE (buf) < 16))
325 parser_in_sync = !GST_BASE_PARSE_LOST_SYNC (parse);
327 if (G_LIKELY (parser_in_sync && dcaparse->last_sync != 0)) {
328 off = gst_byte_reader_masked_scan_uint32 (&r, 0xffffffff,
329 dcaparse->last_sync, 0, GST_BUFFER_SIZE (buf));
332 if (G_UNLIKELY (off < 0)) {
333 off = gst_dca_parse_find_sync (dcaparse, &r, buf, &sync);
336 /* didn't find anything that looks like a sync word, skip */
338 *skipsize = GST_BUFFER_SIZE (buf) - 3;
339 GST_DEBUG_OBJECT (dcaparse, "no sync, skipping %d bytes", *skipsize);
343 GST_LOG_OBJECT (parse, "possible sync %08x at buffer offset %d", sync, off);
345 /* possible frame header, but not at offset 0? skip bytes before sync */
351 /* make sure the values in the frame header look sane */
352 if (!gst_dca_parse_parse_header (dcaparse, &r, &size, &rate, &chans, NULL,
353 NULL, &num_blocks, &samples_per_block, &terminator)) {
358 GST_LOG_OBJECT (parse, "got frame, sync %08x, size %u, rate %d, channels %d",
359 sync, size, rate, chans);
363 dcaparse->last_sync = sync;
365 parser_draining = GST_BASE_PARSE_DRAINING (parse);
367 if (!parser_in_sync && !parser_draining) {
368 /* check for second frame to be sure */
369 GST_DEBUG_OBJECT (dcaparse, "resyncing; checking next frame syncword");
370 if (GST_BUFFER_SIZE (buf) >= (size + 16)) {
371 guint s2, r2, c2, n2, s3;
374 GST_MEMDUMP ("buf", GST_BUFFER_DATA (buf), size + 16);
375 gst_byte_reader_init_from_buffer (&r, buf);
376 gst_byte_reader_skip_unchecked (&r, size);
378 if (!gst_dca_parse_parse_header (dcaparse, &r, &s2, &r2, &c2, NULL, NULL,
380 GST_DEBUG_OBJECT (dcaparse, "didn't find second syncword");
385 /* ok, got sync now, let's assume constant frame size */
386 gst_base_parse_set_min_frame_size (parse, size);
388 /* FIXME: baseparse always seems to hand us buffers of min_frame_size
389 * bytes, which is unhelpful here */
390 GST_LOG_OBJECT (dcaparse, "next sync out of reach (%u < %u)",
391 GST_BUFFER_SIZE (buf), size + 16);
401 gst_dca_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
403 GstDcaParse *dcaparse = GST_DCA_PARSE (parse);
404 GstBuffer *buf = frame->buffer;
405 GstByteReader r = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
406 guint size, rate, chans, depth, block_size, num_blocks, samples_per_block;
410 if (!gst_dca_parse_parse_header (dcaparse, &r, &size, &rate, &chans, &depth,
411 &endianness, &num_blocks, &samples_per_block, &terminator))
414 block_size = num_blocks * samples_per_block;
416 if (G_UNLIKELY (dcaparse->rate != rate || dcaparse->channels != chans
417 || dcaparse->depth != depth || dcaparse->endianness != endianness
418 || (!terminator && dcaparse->block_size != block_size)
419 || (size != dcaparse->frame_size))) {
422 caps = gst_caps_new_simple ("audio/x-dts",
423 "framed", G_TYPE_BOOLEAN, TRUE,
424 "rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, chans,
425 "endianness", G_TYPE_INT, endianness, "depth", G_TYPE_INT, depth,
426 "block-size", G_TYPE_INT, block_size, "frame-size", G_TYPE_INT, size,
428 gst_buffer_set_caps (buf, caps);
429 gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
430 gst_caps_unref (caps);
432 dcaparse->rate = rate;
433 dcaparse->channels = chans;
434 dcaparse->depth = depth;
435 dcaparse->endianness = endianness;
436 dcaparse->block_size = block_size;
437 dcaparse->frame_size = size;
439 gst_base_parse_set_frame_rate (parse, rate, block_size, 0, 0);
447 /* this really shouldn't ever happen */
448 GST_ELEMENT_ERROR (parse, STREAM, DECODE, (NULL), (NULL));
449 return GST_FLOW_ERROR;