1 /* GStreamer Wavpack plugin
2 * Copyright (c) 2005 Arwed v. Merkatz <v.merkatz@gmx.net>
3 * Copyright (c) 2006 Edward Hervey <bilboed@gmail.com>
4 * Copyright (c) 2006 Sebastian Dröge <slomo@circular-chaos.org>
6 * gstwavpackdec.c: raw Wavpack bitstream decoder
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:element-wavpackdec
28 * WavpackDec decodes framed (for example by the WavpackParse element)
29 * Wavpack streams and decodes them to raw audio.
30 * <ulink url="http://www.wavpack.com/">Wavpack</ulink> is an open-source
31 * audio codec that features both lossless and lossy encoding.
32 * <title>Example launch line</title>
35 * gst-launch filesrc location=test.wv ! wavpackparse ! wavpackdec ! audioconvert ! audioresample ! autoaudiosink
37 * This pipeline decodes the Wavpack file test.wv into raw audio buffers and
38 * tries to play it back using an automatically found audio sink.
48 #include <gst/audio/audio.h>
49 #include <gst/audio/multichannel.h>
54 #include <wavpack/wavpack.h>
55 #include "gstwavpackdec.h"
56 #include "gstwavpackcommon.h"
57 #include "gstwavpackstreamreader.h"
60 #define WAVPACK_DEC_MAX_ERRORS 16
62 GST_DEBUG_CATEGORY_STATIC (gst_wavpack_dec_debug);
63 #define GST_CAT_DEFAULT gst_wavpack_dec_debug
65 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
68 GST_STATIC_CAPS ("audio/x-wavpack, "
69 "width = (int) [ 1, 32 ], "
70 "channels = (int) [ 1, 8 ], "
71 "rate = (int) [ 6000, 192000 ], " "framed = (boolean) true")
74 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
77 GST_STATIC_CAPS ("audio/x-raw-int, "
79 "depth = (int) [ 1, 32 ], "
80 "channels = (int) [ 1, 8 ], "
81 "rate = (int) [ 6000, 192000 ], "
82 "endianness = (int) BYTE_ORDER, " "signed = (boolean) true")
85 static GstFlowReturn gst_wavpack_dec_chain (GstPad * pad, GstBuffer * buffer);
86 static gboolean gst_wavpack_dec_sink_set_caps (GstPad * pad, GstCaps * caps);
87 static gboolean gst_wavpack_dec_sink_event (GstPad * pad, GstEvent * event);
88 static void gst_wavpack_dec_finalize (GObject * object);
89 static GstStateChangeReturn gst_wavpack_dec_change_state (GstElement * element,
90 GstStateChange transition);
91 static gboolean gst_wavpack_dec_sink_event (GstPad * pad, GstEvent * event);
92 static void gst_wavpack_dec_post_tags (GstWavpackDec * dec);
94 GST_BOILERPLATE (GstWavpackDec, gst_wavpack_dec, GstElement, GST_TYPE_ELEMENT);
97 gst_wavpack_dec_base_init (gpointer klass)
99 static const GstElementDetails plugin_details =
100 GST_ELEMENT_DETAILS ("Wavpack audio decoder",
101 "Codec/Decoder/Audio",
102 "Decodes Wavpack audio data",
103 "Arwed v. Merkatz <v.merkatz@gmx.net>, "
104 "Sebastian Dröge <slomo@circular-chaos.org>");
105 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
107 gst_element_class_add_pad_template (element_class,
108 gst_static_pad_template_get (&src_factory));
109 gst_element_class_add_pad_template (element_class,
110 gst_static_pad_template_get (&sink_factory));
111 gst_element_class_set_details (element_class, &plugin_details);
115 gst_wavpack_dec_class_init (GstWavpackDecClass * klass)
117 GObjectClass *gobject_class = (GObjectClass *) klass;
118 GstElementClass *gstelement_class = (GstElementClass *) klass;
120 gstelement_class->change_state =
121 GST_DEBUG_FUNCPTR (gst_wavpack_dec_change_state);
122 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_wavpack_dec_finalize);
126 gst_wavpack_dec_reset (GstWavpackDec * dec)
128 dec->wv_id.buffer = NULL;
129 dec->wv_id.position = dec->wv_id.length = 0;
131 dec->error_count = 0;
134 dec->channel_mask = 0;
135 dec->sample_rate = 0;
138 gst_segment_init (&dec->segment, GST_FORMAT_TIME);
139 dec->next_block_index = 0;
143 gst_wavpack_dec_init (GstWavpackDec * dec, GstWavpackDecClass * gklass)
145 dec->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
146 gst_pad_set_chain_function (dec->sinkpad,
147 GST_DEBUG_FUNCPTR (gst_wavpack_dec_chain));
148 gst_pad_set_setcaps_function (dec->sinkpad,
149 GST_DEBUG_FUNCPTR (gst_wavpack_dec_sink_set_caps));
150 gst_pad_set_event_function (dec->sinkpad,
151 GST_DEBUG_FUNCPTR (gst_wavpack_dec_sink_event));
152 gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
154 dec->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
155 gst_pad_use_fixed_caps (dec->srcpad);
156 gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
159 dec->stream_reader = gst_wavpack_stream_reader_new ();
161 gst_wavpack_dec_reset (dec);
165 gst_wavpack_dec_finalize (GObject * object)
167 GstWavpackDec *dec = GST_WAVPACK_DEC (object);
169 g_free (dec->stream_reader);
170 dec->stream_reader = NULL;
172 G_OBJECT_CLASS (parent_class)->finalize (object);
176 gst_wavpack_dec_sink_set_caps (GstPad * pad, GstCaps * caps)
178 GstWavpackDec *dec = GST_WAVPACK_DEC (gst_pad_get_parent (pad));
179 GstStructure *structure = gst_caps_get_structure (caps, 0);
181 /* Check if we can set the caps here already */
182 if (gst_structure_get_int (structure, "channels", &dec->channels) &&
183 gst_structure_get_int (structure, "rate", &dec->sample_rate) &&
184 gst_structure_get_int (structure, "width", &dec->depth)) {
186 GstAudioChannelPosition *pos;
188 caps = gst_caps_new_simple ("audio/x-raw-int",
189 "rate", G_TYPE_INT, dec->sample_rate,
190 "channels", G_TYPE_INT, dec->channels,
191 "depth", G_TYPE_INT, dec->depth,
192 "width", G_TYPE_INT, 32,
193 "endianness", G_TYPE_INT, G_BYTE_ORDER,
194 "signed", G_TYPE_BOOLEAN, TRUE, NULL);
196 /* If we already have the channel layout set from upstream
198 if (gst_structure_has_field (structure, "channel-positions")) {
199 pos = gst_audio_get_channel_positions (structure);
200 if (pos != NULL && dec->channels > 2) {
201 GstStructure *new_str = gst_caps_get_structure (caps, 0);
203 gst_audio_set_channel_positions (new_str, pos);
205 gst_wavpack_get_channel_mask_from_positions (pos, dec->channels);
212 GST_DEBUG_OBJECT (dec, "setting caps %" GST_PTR_FORMAT, caps);
214 /* should always succeed */
215 gst_pad_set_caps (dec->srcpad, caps);
216 gst_caps_unref (caps);
218 /* send GST_TAG_AUDIO_CODEC and GST_TAG_BITRATE tags before something
219 * is decoded or after the format has changed */
220 gst_wavpack_dec_post_tags (dec);
223 gst_object_unref (dec);
229 gst_wavpack_dec_post_tags (GstWavpackDec * dec)
232 GstFormat format_time = GST_FORMAT_TIME, format_bytes = GST_FORMAT_BYTES;
233 gint64 duration, size;
235 list = gst_tag_list_new ();
237 gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
238 GST_TAG_AUDIO_CODEC, "Wavpack", NULL);
240 /* try to estimate the average bitrate */
241 if (gst_pad_query_peer_duration (dec->sinkpad, &format_bytes, &size) &&
242 gst_pad_query_peer_duration (dec->sinkpad, &format_time, &duration) &&
243 size > 0 && duration > 0) {
246 bitrate = gst_util_uint64_scale (size, 8 * GST_SECOND, duration);
247 gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
248 (guint) bitrate, NULL);
251 gst_element_post_message (GST_ELEMENT (dec),
252 gst_message_new_tag (GST_OBJECT (dec), list));
256 gst_wavpack_dec_chain (GstPad * pad, GstBuffer * buf)
260 GstFlowReturn ret = GST_FLOW_OK;
262 int32_t decoded, unpacked_size;
263 gboolean format_changed;
265 dec = GST_WAVPACK_DEC (GST_PAD_PARENT (pad));
267 /* check input, we only accept framed input with complete chunks */
268 if (GST_BUFFER_SIZE (buf) < sizeof (WavpackHeader))
269 goto input_not_framed;
271 if (!gst_wavpack_read_header (&wph, GST_BUFFER_DATA (buf)))
274 if (GST_BUFFER_SIZE (buf) < wph.ckSize + 4 * 1 + 4)
275 goto input_not_framed;
277 if (!(wph.flags & INITIAL_BLOCK))
278 goto input_not_framed;
280 dec->wv_id.buffer = GST_BUFFER_DATA (buf);
281 dec->wv_id.length = GST_BUFFER_SIZE (buf);
282 dec->wv_id.position = 0;
284 /* create a new wavpack context if there is none yet but if there
285 * was already one (i.e. caps were set on the srcpad) check whether
286 * the new one has the same caps */
290 dec->context = WavpackOpenFileInputEx (dec->stream_reader,
291 &dec->wv_id, NULL, error_msg, OPEN_STREAMING, 0);
294 GST_WARNING ("Couldn't decode buffer: %s", error_msg);
296 if (dec->error_count <= WAVPACK_DEC_MAX_ERRORS) {
297 goto out; /* just return OK for now */
304 g_assert (dec->context != NULL);
306 dec->error_count = 0;
309 (dec->sample_rate != WavpackGetSampleRate (dec->context)) ||
310 (dec->channels != WavpackGetNumChannels (dec->context)) ||
311 (dec->depth != WavpackGetBitsPerSample (dec->context)) ||
312 #ifdef WAVPACK_OLD_API
313 (dec->channel_mask != dec->context->config.channel_mask);
315 (dec->channel_mask != WavpackGetChannelMask (dec->context));
318 if (!GST_PAD_CAPS (dec->srcpad) || format_changed) {
322 dec->sample_rate = WavpackGetSampleRate (dec->context);
323 dec->channels = WavpackGetNumChannels (dec->context);
324 dec->depth = WavpackGetBitsPerSample (dec->context);
326 caps = gst_caps_new_simple ("audio/x-raw-int",
327 "rate", G_TYPE_INT, dec->sample_rate,
328 "channels", G_TYPE_INT, dec->channels,
329 "depth", G_TYPE_INT, dec->depth,
330 "width", G_TYPE_INT, 32,
331 "endianness", G_TYPE_INT, G_BYTE_ORDER,
332 "signed", G_TYPE_BOOLEAN, TRUE, NULL);
334 #ifdef WAVPACK_OLD_API
335 channel_mask = dec->context->config.channel_mask;
337 channel_mask = WavpackGetChannelMask (dec->context);
339 if (channel_mask == 0)
340 channel_mask = gst_wavpack_get_default_channel_mask (dec->channels);
342 dec->channel_mask = channel_mask;
344 /* Only set the channel layout for more than two channels
345 * otherwise things break unfortunately */
346 if (channel_mask != 0 && dec->channels > 2)
347 if (!gst_wavpack_set_channel_layout (caps, channel_mask))
348 GST_WARNING_OBJECT (dec, "Failed to set channel layout");
350 GST_DEBUG_OBJECT (dec, "setting caps %" GST_PTR_FORMAT, caps);
352 /* should always succeed */
353 gst_pad_set_caps (dec->srcpad, caps);
354 gst_caps_unref (caps);
356 /* send GST_TAG_AUDIO_CODEC and GST_TAG_BITRATE tags before something
357 * is decoded or after the format has changed */
358 gst_wavpack_dec_post_tags (dec);
361 /* alloc output buffer */
362 unpacked_size = 4 * wph.block_samples * dec->channels;
363 ret = gst_pad_alloc_buffer (dec->srcpad, GST_BUFFER_OFFSET (buf),
364 unpacked_size, GST_PAD_CAPS (dec->srcpad), &outbuf);
366 if (ret != GST_FLOW_OK)
369 gst_buffer_copy_metadata (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS);
371 /* If we got a DISCONT buffer forward the flag. Nothing else
372 * has to be done as libwavpack doesn't store state between
374 if (GST_BUFFER_IS_DISCONT (buf) || dec->next_block_index != wph.block_index)
375 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
377 dec->next_block_index = wph.block_index + wph.block_samples;
380 decoded = WavpackUnpackSamples (dec->context,
381 (int32_t *) GST_BUFFER_DATA (outbuf), wph.block_samples);
382 if (decoded != wph.block_samples)
385 if ((outbuf = gst_audio_buffer_clip (outbuf, &dec->segment,
386 dec->sample_rate, 4 * dec->channels))) {
387 GST_LOG_OBJECT (dec, "pushing buffer with time %" GST_TIME_FORMAT,
388 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
389 ret = gst_pad_push (dec->srcpad, outbuf);
394 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
395 GST_DEBUG_OBJECT (dec, "flow: %s", gst_flow_get_name (ret));
398 gst_buffer_unref (buf);
405 GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL), ("Expected framed input"));
406 gst_buffer_unref (buf);
407 return GST_FLOW_ERROR;
411 GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL), ("Invalid wavpack header"));
412 gst_buffer_unref (buf);
413 return GST_FLOW_ERROR;
417 const gchar *reason = "unknown";
420 #ifdef WAVPACK_OLD_API
421 reason = dec->context->error_message;
423 reason = WavpackGetErrorMessage (dec->context);
426 reason = "couldn't create decoder context";
428 GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
429 ("Failed to decode wavpack stream: %s", reason));
430 gst_buffer_unref (outbuf);
431 gst_buffer_unref (buf);
432 return GST_FLOW_ERROR;
437 gst_wavpack_dec_sink_event (GstPad * pad, GstEvent * event)
439 GstWavpackDec *dec = GST_WAVPACK_DEC (gst_pad_get_parent (pad));
441 GST_LOG_OBJECT (dec, "Received %s event", GST_EVENT_TYPE_NAME (event));
442 switch (GST_EVENT_TYPE (event)) {
443 case GST_EVENT_NEWSEGMENT:{
446 gint64 start, end, base;
449 gst_event_parse_new_segment (event, &is_update, &rate, &fmt, &start,
451 if (fmt == GST_FORMAT_TIME) {
452 GST_DEBUG ("Got NEWSEGMENT event in GST_FORMAT_TIME, passing on (%"
453 GST_TIME_FORMAT " - %" GST_TIME_FORMAT ")", GST_TIME_ARGS (start),
454 GST_TIME_ARGS (end));
455 gst_segment_set_newsegment (&dec->segment, is_update, rate, fmt,
458 gst_segment_init (&dec->segment, GST_FORMAT_TIME);
466 gst_object_unref (dec);
467 return gst_pad_event_default (pad, event);
470 static GstStateChangeReturn
471 gst_wavpack_dec_change_state (GstElement * element, GstStateChange transition)
473 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
474 GstWavpackDec *dec = GST_WAVPACK_DEC (element);
476 switch (transition) {
477 case GST_STATE_CHANGE_NULL_TO_READY:
479 case GST_STATE_CHANGE_READY_TO_PAUSED:
481 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
487 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
489 switch (transition) {
490 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
492 case GST_STATE_CHANGE_PAUSED_TO_READY:
494 WavpackCloseFile (dec->context);
498 gst_wavpack_dec_reset (dec);
500 case GST_STATE_CHANGE_READY_TO_NULL:
510 gst_wavpack_dec_plugin_init (GstPlugin * plugin)
512 if (!gst_element_register (plugin, "wavpackdec",
513 GST_RANK_PRIMARY, GST_TYPE_WAVPACK_DEC))
515 GST_DEBUG_CATEGORY_INIT (gst_wavpack_dec_debug, "wavpack_dec", 0,