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
27 * WavpackDec decodes framed (for example by the WavpackParse element)
28 * Wavpack streams and decodes them to raw audio.
29 * <ulink url="http://www.wavpack.com/">Wavpack</ulink> is an open-source
30 * audio codec that features both lossless and lossy encoding.
33 * <title>Example launch line</title>
35 * gst-launch filesrc location=test.wv ! wavpackparse ! wavpackdec ! audioconvert ! audioresample ! autoaudiosink
36 * ]| This pipeline decodes the Wavpack file test.wv into raw audio buffers and
37 * tries to play it back using an automatically found audio sink.
46 #include <gst/audio/audio.h>
47 #include <gst/audio/multichannel.h>
52 #include <wavpack/wavpack.h>
53 #include "gstwavpackdec.h"
54 #include "gstwavpackcommon.h"
55 #include "gstwavpackstreamreader.h"
58 #define WAVPACK_DEC_MAX_ERRORS 16
60 GST_DEBUG_CATEGORY_STATIC (gst_wavpack_dec_debug);
61 #define GST_CAT_DEFAULT gst_wavpack_dec_debug
63 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
66 GST_STATIC_CAPS ("audio/x-wavpack, "
67 "width = (int) [ 1, 32 ], "
68 "channels = (int) [ 1, 8 ], "
69 "rate = (int) [ 6000, 192000 ], " "framed = (boolean) true")
72 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
75 GST_STATIC_CAPS ("audio/x-raw-int, "
77 "depth = (int) [ 1, 32 ], "
78 "channels = (int) [ 1, 8 ], "
79 "rate = (int) [ 6000, 192000 ], "
80 "endianness = (int) BYTE_ORDER, " "signed = (boolean) true")
83 static GstFlowReturn gst_wavpack_dec_chain (GstPad * pad, GstBuffer * buffer);
84 static gboolean gst_wavpack_dec_sink_set_caps (GstPad * pad, GstCaps * caps);
85 static gboolean gst_wavpack_dec_sink_event (GstPad * pad, GstEvent * event);
86 static void gst_wavpack_dec_finalize (GObject * object);
87 static GstStateChangeReturn gst_wavpack_dec_change_state (GstElement * element,
88 GstStateChange transition);
89 static void gst_wavpack_dec_post_tags (GstWavpackDec * dec);
91 GST_BOILERPLATE (GstWavpackDec, gst_wavpack_dec, GstElement, GST_TYPE_ELEMENT);
94 gst_wavpack_dec_base_init (gpointer klass)
96 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
98 gst_element_class_add_pad_template (element_class,
99 gst_static_pad_template_get (&src_factory));
100 gst_element_class_add_pad_template (element_class,
101 gst_static_pad_template_get (&sink_factory));
102 gst_element_class_set_details_simple (element_class, "Wavpack audio decoder",
103 "Codec/Decoder/Audio",
104 "Decodes Wavpack audio data",
105 "Arwed v. Merkatz <v.merkatz@gmx.net>, "
106 "Sebastian Dröge <slomo@circular-chaos.org>");
110 gst_wavpack_dec_class_init (GstWavpackDecClass * klass)
112 GObjectClass *gobject_class = (GObjectClass *) klass;
113 GstElementClass *gstelement_class = (GstElementClass *) klass;
115 gstelement_class->change_state =
116 GST_DEBUG_FUNCPTR (gst_wavpack_dec_change_state);
117 gobject_class->finalize = gst_wavpack_dec_finalize;
121 gst_wavpack_dec_reset (GstWavpackDec * dec)
123 dec->wv_id.buffer = NULL;
124 dec->wv_id.position = dec->wv_id.length = 0;
126 dec->error_count = 0;
129 dec->channel_mask = 0;
130 dec->sample_rate = 0;
133 gst_segment_init (&dec->segment, GST_FORMAT_TIME);
134 dec->next_block_index = 0;
138 gst_wavpack_dec_init (GstWavpackDec * dec, GstWavpackDecClass * gklass)
140 dec->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
141 gst_pad_set_chain_function (dec->sinkpad,
142 GST_DEBUG_FUNCPTR (gst_wavpack_dec_chain));
143 gst_pad_set_setcaps_function (dec->sinkpad,
144 GST_DEBUG_FUNCPTR (gst_wavpack_dec_sink_set_caps));
145 gst_pad_set_event_function (dec->sinkpad,
146 GST_DEBUG_FUNCPTR (gst_wavpack_dec_sink_event));
147 gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
149 dec->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
150 gst_pad_use_fixed_caps (dec->srcpad);
151 gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
154 dec->stream_reader = gst_wavpack_stream_reader_new ();
156 gst_wavpack_dec_reset (dec);
160 gst_wavpack_dec_finalize (GObject * object)
162 GstWavpackDec *dec = GST_WAVPACK_DEC (object);
164 g_free (dec->stream_reader);
165 dec->stream_reader = NULL;
167 G_OBJECT_CLASS (parent_class)->finalize (object);
171 gst_wavpack_dec_sink_set_caps (GstPad * pad, GstCaps * caps)
173 GstWavpackDec *dec = GST_WAVPACK_DEC (gst_pad_get_parent (pad));
174 GstStructure *structure = gst_caps_get_structure (caps, 0);
176 /* Check if we can set the caps here already */
177 if (gst_structure_get_int (structure, "channels", &dec->channels) &&
178 gst_structure_get_int (structure, "rate", &dec->sample_rate) &&
179 gst_structure_get_int (structure, "width", &dec->depth)) {
181 GstAudioChannelPosition *pos;
183 caps = gst_caps_new_simple ("audio/x-raw-int",
184 "rate", G_TYPE_INT, dec->sample_rate,
185 "channels", G_TYPE_INT, dec->channels,
186 "depth", G_TYPE_INT, dec->depth,
187 "width", G_TYPE_INT, 32,
188 "endianness", G_TYPE_INT, G_BYTE_ORDER,
189 "signed", G_TYPE_BOOLEAN, TRUE, NULL);
191 /* If we already have the channel layout set from upstream
193 if (gst_structure_has_field (structure, "channel-positions")) {
194 pos = gst_audio_get_channel_positions (structure);
195 if (pos != NULL && dec->channels > 2) {
196 GstStructure *new_str = gst_caps_get_structure (caps, 0);
198 gst_audio_set_channel_positions (new_str, pos);
200 gst_wavpack_get_channel_mask_from_positions (pos, dec->channels);
207 GST_DEBUG_OBJECT (dec, "setting caps %" GST_PTR_FORMAT, caps);
209 /* should always succeed */
210 gst_pad_set_caps (dec->srcpad, caps);
211 gst_caps_unref (caps);
213 /* send GST_TAG_AUDIO_CODEC and GST_TAG_BITRATE tags before something
214 * is decoded or after the format has changed */
215 gst_wavpack_dec_post_tags (dec);
218 gst_object_unref (dec);
224 gst_wavpack_dec_post_tags (GstWavpackDec * dec)
227 GstFormat format_time = GST_FORMAT_TIME, format_bytes = GST_FORMAT_BYTES;
228 gint64 duration, size;
230 list = gst_tag_list_new ();
232 gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
233 GST_TAG_AUDIO_CODEC, "Wavpack", NULL);
235 /* try to estimate the average bitrate */
236 if (gst_pad_query_peer_duration (dec->sinkpad, &format_bytes, &size) &&
237 gst_pad_query_peer_duration (dec->sinkpad, &format_time, &duration) &&
238 size > 0 && duration > 0) {
241 bitrate = gst_util_uint64_scale (size, 8 * GST_SECOND, duration);
242 gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
243 (guint) bitrate, NULL);
246 gst_element_post_message (GST_ELEMENT (dec),
247 gst_message_new_tag (GST_OBJECT (dec), list));
251 gst_wavpack_dec_chain (GstPad * pad, GstBuffer * buf)
254 GstBuffer *outbuf = NULL;
255 GstFlowReturn ret = GST_FLOW_OK;
257 int32_t decoded, unpacked_size;
258 gboolean format_changed;
260 dec = GST_WAVPACK_DEC (GST_PAD_PARENT (pad));
262 /* check input, we only accept framed input with complete chunks */
263 if (GST_BUFFER_SIZE (buf) < sizeof (WavpackHeader))
264 goto input_not_framed;
266 if (!gst_wavpack_read_header (&wph, GST_BUFFER_DATA (buf)))
269 if (GST_BUFFER_SIZE (buf) < wph.ckSize + 4 * 1 + 4)
270 goto input_not_framed;
272 if (!(wph.flags & INITIAL_BLOCK))
273 goto input_not_framed;
275 dec->wv_id.buffer = GST_BUFFER_DATA (buf);
276 dec->wv_id.length = GST_BUFFER_SIZE (buf);
277 dec->wv_id.position = 0;
279 /* create a new wavpack context if there is none yet but if there
280 * was already one (i.e. caps were set on the srcpad) check whether
281 * the new one has the same caps */
285 dec->context = WavpackOpenFileInputEx (dec->stream_reader,
286 &dec->wv_id, NULL, error_msg, OPEN_STREAMING, 0);
289 GST_WARNING ("Couldn't decode buffer: %s", error_msg);
291 if (dec->error_count <= WAVPACK_DEC_MAX_ERRORS) {
292 goto out; /* just return OK for now */
299 g_assert (dec->context != NULL);
301 dec->error_count = 0;
304 (dec->sample_rate != WavpackGetSampleRate (dec->context)) ||
305 (dec->channels != WavpackGetNumChannels (dec->context)) ||
306 (dec->depth != WavpackGetBitsPerSample (dec->context)) ||
307 #ifdef WAVPACK_OLD_API
308 (dec->channel_mask != dec->context->config.channel_mask);
310 (dec->channel_mask != WavpackGetChannelMask (dec->context));
313 if (!GST_PAD_CAPS (dec->srcpad) || format_changed) {
317 dec->sample_rate = WavpackGetSampleRate (dec->context);
318 dec->channels = WavpackGetNumChannels (dec->context);
319 dec->depth = WavpackGetBitsPerSample (dec->context);
321 caps = gst_caps_new_simple ("audio/x-raw-int",
322 "rate", G_TYPE_INT, dec->sample_rate,
323 "channels", G_TYPE_INT, dec->channels,
324 "depth", G_TYPE_INT, dec->depth,
325 "width", G_TYPE_INT, 32,
326 "endianness", G_TYPE_INT, G_BYTE_ORDER,
327 "signed", G_TYPE_BOOLEAN, TRUE, NULL);
329 #ifdef WAVPACK_OLD_API
330 channel_mask = dec->context->config.channel_mask;
332 channel_mask = WavpackGetChannelMask (dec->context);
334 if (channel_mask == 0)
335 channel_mask = gst_wavpack_get_default_channel_mask (dec->channels);
337 dec->channel_mask = channel_mask;
339 /* Only set the channel layout for more than two channels
340 * otherwise things break unfortunately */
341 if (channel_mask != 0 && dec->channels > 2)
342 if (!gst_wavpack_set_channel_layout (caps, channel_mask))
343 GST_WARNING_OBJECT (dec, "Failed to set channel layout");
345 GST_DEBUG_OBJECT (dec, "setting caps %" GST_PTR_FORMAT, caps);
347 /* should always succeed */
348 gst_pad_set_caps (dec->srcpad, caps);
349 gst_caps_unref (caps);
351 /* send GST_TAG_AUDIO_CODEC and GST_TAG_BITRATE tags before something
352 * is decoded or after the format has changed */
353 gst_wavpack_dec_post_tags (dec);
356 /* alloc output buffer */
357 unpacked_size = 4 * wph.block_samples * dec->channels;
358 ret = gst_pad_alloc_buffer (dec->srcpad, GST_BUFFER_OFFSET (buf),
359 unpacked_size, GST_PAD_CAPS (dec->srcpad), &outbuf);
361 if (ret != GST_FLOW_OK)
364 gst_buffer_copy_metadata (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS);
366 /* If we got a DISCONT buffer forward the flag. Nothing else
367 * has to be done as libwavpack doesn't store state between
369 if (GST_BUFFER_IS_DISCONT (buf) || dec->next_block_index != wph.block_index)
370 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
372 dec->next_block_index = wph.block_index + wph.block_samples;
375 decoded = WavpackUnpackSamples (dec->context,
376 (int32_t *) GST_BUFFER_DATA (outbuf), wph.block_samples);
377 if (decoded != wph.block_samples)
380 if ((outbuf = gst_audio_buffer_clip (outbuf, &dec->segment,
381 dec->sample_rate, 4 * dec->channels))) {
382 GST_LOG_OBJECT (dec, "pushing buffer with time %" GST_TIME_FORMAT,
383 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
384 ret = gst_pad_push (dec->srcpad, outbuf);
389 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
390 GST_DEBUG_OBJECT (dec, "flow: %s", gst_flow_get_name (ret));
393 gst_buffer_unref (buf);
400 GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL), ("Expected framed input"));
401 gst_buffer_unref (buf);
402 return GST_FLOW_ERROR;
406 GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL), ("Invalid wavpack header"));
407 gst_buffer_unref (buf);
408 return GST_FLOW_ERROR;
412 const gchar *reason = "unknown";
415 #ifdef WAVPACK_OLD_API
416 reason = dec->context->error_message;
418 reason = WavpackGetErrorMessage (dec->context);
421 reason = "couldn't create decoder context";
423 GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
424 ("Failed to decode wavpack stream: %s", reason));
426 gst_buffer_unref (outbuf);
427 gst_buffer_unref (buf);
428 return GST_FLOW_ERROR;
433 gst_wavpack_dec_sink_event (GstPad * pad, GstEvent * event)
435 GstWavpackDec *dec = GST_WAVPACK_DEC (gst_pad_get_parent (pad));
437 GST_LOG_OBJECT (dec, "Received %s event", GST_EVENT_TYPE_NAME (event));
438 switch (GST_EVENT_TYPE (event)) {
439 case GST_EVENT_NEWSEGMENT:{
442 gint64 start, end, base;
445 gst_event_parse_new_segment (event, &is_update, &rate, &fmt, &start,
447 if (fmt == GST_FORMAT_TIME) {
448 GST_DEBUG ("Got NEWSEGMENT event in GST_FORMAT_TIME, passing on (%"
449 GST_TIME_FORMAT " - %" GST_TIME_FORMAT ")", GST_TIME_ARGS (start),
450 GST_TIME_ARGS (end));
451 gst_segment_set_newsegment (&dec->segment, is_update, rate, fmt,
454 gst_segment_init (&dec->segment, GST_FORMAT_TIME);
462 gst_object_unref (dec);
463 return gst_pad_event_default (pad, event);
466 static GstStateChangeReturn
467 gst_wavpack_dec_change_state (GstElement * element, GstStateChange transition)
469 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
470 GstWavpackDec *dec = GST_WAVPACK_DEC (element);
472 switch (transition) {
473 case GST_STATE_CHANGE_NULL_TO_READY:
475 case GST_STATE_CHANGE_READY_TO_PAUSED:
477 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
483 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
485 switch (transition) {
486 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
488 case GST_STATE_CHANGE_PAUSED_TO_READY:
490 WavpackCloseFile (dec->context);
494 gst_wavpack_dec_reset (dec);
496 case GST_STATE_CHANGE_READY_TO_NULL:
506 gst_wavpack_dec_plugin_init (GstPlugin * plugin)
508 if (!gst_element_register (plugin, "wavpackdec",
509 GST_RANK_PRIMARY, GST_TYPE_WAVPACK_DEC))
511 GST_DEBUG_CATEGORY_INIT (gst_wavpack_dec_debug, "wavpack_dec", 0,