summaryrefslogtreecommitdiff
path: root/sys/acmmp3dec/acmmp3dec.c
blob: 2f27992706444ad88e822b48299c717e23a2144f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
/* GStreamer
 * Copyright (C) 2008 Pioneers of the Inevitable <songbird@songbirdnest.com>
 *
 * Authors: Michael Smith <msmith@songbirdnest.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <windows.h>
#include <mmreg.h>
#include <msacm.h>

#include <gst/gst.h>
#include <gst/riff/riff-media.h>

#define ACM_BUFFER_SIZE (64 * 1024)

#define GST_TYPE_ACM_MP3_DEC \
      (acmmp3dec_get_type())
#define GST_ACM_MP3_DEC(obj) \
      (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ACM_MP3_DEC,ACMMP3Dec))

#define GST_CAT_DEFAULT acmmp3dec_debug
GST_DEBUG_CATEGORY_STATIC (acmmp3dec_debug);

static GstStaticPadTemplate acmmp3dec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-raw-int, "
        "depth = (int)16, "
        "width = (int)16, "
        "endianness = (int)" G_STRINGIFY (G_BYTE_ORDER) ", "
        "signed = (boolean)TRUE, "
        "channels = (int) [1,2], " "rate = (int)[1, MAX]")
    );

static GstStaticPadTemplate acmmp3dec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/mpeg, "
        "mpegversion = (int)1, "
        "layer = (int)3, "
        "rate = (int){ 8000, 11025, 12000, 16000, 22050, 24000, "
        "              32000, 44100, 48000 }, "
        "channels = (int)[1,2], " "parsed = (boolean) true")
    );

typedef struct _ACMMP3DecClass
{
  GstElementClass parent_class;
} ACMMP3DecClass;

typedef struct _ACMMP3Dec
{
  GstElement parent;

  GstPad *sinkpad;
  GstPad *srcpad;

  gboolean is_setup;

  MPEGLAYER3WAVEFORMAT infmt;
  WAVEFORMATEX outfmt;

  HACMSTREAM stream;
  ACMSTREAMHEADER header;

  /* Next timestamp to push */
  GstClockTime timestamp;

  /* From received caps */
  int rate;
  int channels;

  GstCaps *output_caps;
} ACMMP3Dec;

GType acmmp3dec_get_type (void);

GST_BOILERPLATE (ACMMP3Dec, acmmp3dec, GstElement, GST_TYPE_ELEMENT);

static GstCaps *
acmmp3dec_caps_from_format (WAVEFORMATEX * fmt)
{
  return gst_riff_create_audio_caps (fmt->wFormatTag,
      NULL, (gst_riff_strf_auds *) fmt, NULL, NULL, NULL);
}

static gboolean
acmmp3dec_set_input_format (ACMMP3Dec * dec)
{
  dec->infmt.wfx.wFormatTag = WAVE_FORMAT_MPEGLAYER3;
  dec->infmt.wfx.nChannels = dec->channels;
  dec->infmt.wfx.nSamplesPerSec = dec->rate;
  dec->infmt.wfx.nAvgBytesPerSec = 8000;        /* Has to be set, but actual
                                                   value doesn't matter */
  dec->infmt.wfx.nBlockAlign = 1;
  dec->infmt.wfx.wBitsPerSample = 0;
  dec->infmt.wfx.cbSize = MPEGLAYER3_WFX_EXTRA_BYTES;
  dec->infmt.wID = MPEGLAYER3_ID_MPEG;
  dec->infmt.fdwFlags = MPEGLAYER3_FLAG_PADDING_OFF;
  dec->infmt.nBlockSize = 1;    /* Needs to be non-zero, actual
                                   value doesn't matter */
  dec->infmt.nFramesPerBlock = 1;
  dec->infmt.nCodecDelay = 0;

  return TRUE;
}

static gboolean
acmmp3dec_set_output_format (ACMMP3Dec * dec)
{
  dec->outfmt.wFormatTag = WAVE_FORMAT_PCM;
  dec->outfmt.nChannels = dec->channels;
  dec->outfmt.nSamplesPerSec = dec->rate;
  dec->outfmt.nAvgBytesPerSec = 2 * dec->channels * dec->rate;
  dec->outfmt.nBlockAlign = 2 * dec->channels;
  dec->outfmt.wBitsPerSample = 16;
  dec->outfmt.cbSize = 0;

  return TRUE;
}

static gboolean
acmmp3dec_setup (ACMMP3Dec * dec)
{
  MMRESULT res;
  int destBufferSize;

  acmmp3dec_set_input_format (dec);
  acmmp3dec_set_output_format (dec);

  res =
      acmStreamOpen (&dec->stream, NULL, (LPWAVEFORMATEX) & dec->infmt,
      &dec->outfmt, 0, 0, 0, 0);
  if (res) {
    GST_WARNING_OBJECT (dec, "Failed to open ACM stream: %d", res);
    return FALSE;
  }

  dec->header.cbStruct = sizeof (ACMSTREAMHEADER);
  dec->header.fdwStatus = 0;
  dec->header.dwUser = 0;

  dec->header.pbSrc = (BYTE *) g_malloc (ACM_BUFFER_SIZE);
  dec->header.cbSrcLength = ACM_BUFFER_SIZE;
  dec->header.cbSrcLengthUsed = 0;
  dec->header.dwSrcUser = 0;

  /* Ask what buffer size we need to use for our output */
  acmStreamSize (dec->stream, ACM_BUFFER_SIZE,
      (LPDWORD) & destBufferSize, ACM_STREAMSIZEF_SOURCE);

  dec->header.pbDst = (BYTE *) g_malloc (destBufferSize);
  dec->header.cbDstLength = destBufferSize;
  dec->header.cbDstLengthUsed = 0;
  dec->header.dwDstUser = 0;

  res = acmStreamPrepareHeader (dec->stream, &dec->header, 0);
  if (res) {
    GST_WARNING_OBJECT (dec, "Failed to prepare ACM stream: %x", res);
    return FALSE;
  }

  dec->output_caps = acmmp3dec_caps_from_format (&dec->outfmt);
  if (dec->output_caps) {
    gst_pad_set_caps (dec->srcpad, dec->output_caps);
  }

  dec->timestamp = GST_CLOCK_TIME_NONE;
  dec->is_setup = TRUE;
  return TRUE;
}

static void
acmmp3dec_teardown (ACMMP3Dec * dec)
{
  if (dec->output_caps) {
    gst_caps_unref (dec->output_caps);
    dec->output_caps = NULL;
  }

  if (dec->header.fdwStatus & ACMSTREAMHEADER_STATUSF_PREPARED)
    acmStreamUnprepareHeader (dec->stream, &dec->header, 0);
  if (dec->header.pbSrc)
    g_free (dec->header.pbSrc);
  if (dec->header.pbDst)
    g_free (dec->header.pbDst);
  memset (&dec->header, 0, sizeof (dec->header));

  if (dec->stream) {
    acmStreamClose (dec->stream, 0);
    dec->stream = 0;
  }

  dec->timestamp = GST_CLOCK_TIME_NONE;
  dec->is_setup = FALSE;
}

static gboolean
acmmp3dec_sink_setcaps (GstPad * pad, GstCaps * caps)
{
  ACMMP3Dec *dec = (ACMMP3Dec *) GST_PAD_PARENT (pad);
  GstStructure *structure;
  gboolean ret;

  structure = gst_caps_get_structure (caps, 0);
  gst_structure_get_int (structure, "channels", &dec->channels);
  gst_structure_get_int (structure, "rate", &dec->rate);

  if (dec->is_setup)
    acmmp3dec_teardown (dec);
  ret = acmmp3dec_setup (dec);

  return ret;
}

static GstFlowReturn
acmmp3dec_push_output (ACMMP3Dec * dec)
{
  GstFlowReturn ret = GST_FLOW_OK;

  if (dec->header.cbDstLengthUsed > 0) {
    GstBuffer *outbuf = gst_buffer_new_and_alloc (dec->header.cbDstLengthUsed);
    memcpy (GST_BUFFER_DATA (outbuf), dec->header.pbDst,
        dec->header.cbDstLengthUsed);

    if (dec->timestamp != GST_CLOCK_TIME_NONE)
      GST_BUFFER_TIMESTAMP (outbuf) = dec->timestamp;
    GST_BUFFER_DURATION (outbuf) =
        gst_util_uint64_scale_int (GST_BUFFER_SIZE (outbuf), GST_SECOND,
        dec->rate * dec->channels * 2);

    GST_DEBUG_OBJECT (dec, "decoded buffer has ts %d, duration %d",
        (int) (GST_BUFFER_TIMESTAMP (outbuf)),
        (int) (GST_BUFFER_DURATION (outbuf)));

    gst_buffer_set_caps (outbuf, dec->output_caps);

    if (dec->timestamp != GST_CLOCK_TIME_NONE)
      dec->timestamp += GST_BUFFER_DURATION (outbuf);

    GST_DEBUG_OBJECT (dec, "Pushing %lu byte decoded buffer",
        dec->header.cbDstLengthUsed);
    ret = gst_pad_push (dec->srcpad, outbuf);
  } else
    GST_DEBUG_OBJECT (dec, "Not pushing decoded buffer, no output");


  return ret;
}

static GstFlowReturn
acmmp3dec_chain (GstPad * pad, GstBuffer * buf)
{
  MMRESULT res;
  ACMMP3Dec *dec = (ACMMP3Dec *) GST_PAD_PARENT (pad);
  guchar *data = GST_BUFFER_DATA (buf);
  gint len = GST_BUFFER_SIZE (buf);
  GstFlowReturn ret = GST_FLOW_OK;

  if (len > ACM_BUFFER_SIZE) {
    GST_WARNING_OBJECT (dec, "Impossibly large mp3 frame!");
    ret = GST_FLOW_ERROR;
    goto done;
  }

  if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE &&
      (dec->timestamp == GST_CLOCK_TIME_NONE ||
          GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT))) {
    dec->timestamp = GST_BUFFER_TIMESTAMP (buf);
  }

  memcpy (dec->header.pbSrc, data, len);
  dec->header.cbSrcLength = len;

  /* Now we have a buffer ready to go */
  res = acmStreamConvert (dec->stream, &dec->header,
      ACM_STREAMCONVERTF_BLOCKALIGN);
  if (res) {
    GST_WARNING_OBJECT (dec, "Failed to decode data");
    ret = GST_FLOW_OK;          /* Maybe it was just a corrupt frame */
    goto done;
  }

  if (dec->header.cbSrcLengthUsed > 0) {
    if (dec->header.cbSrcLengthUsed != dec->header.cbSrcLength) {
      GST_WARNING_OBJECT (dec, "ACM decoder didn't consume all data!");
      /* We could handle this, but it shouldn't be possible, so don't try
       * for now */
      ret = GST_FLOW_ERROR;
      goto done;
    }

    /* Write out any data produced */
    acmmp3dec_push_output (dec);
  }

done:
  gst_buffer_unref (buf);

  return ret;
}

static GstFlowReturn
acmmp3dec_finish_stream (ACMMP3Dec * dec)
{
  MMRESULT res;
  GstFlowReturn ret = GST_FLOW_OK;

  dec->header.cbSrcLength = 0;

  /* Flush out any remaining data internal to the decoder */
  res = acmStreamConvert (dec->stream, &dec->header,
      ACM_STREAMCONVERTF_BLOCKALIGN | ACM_STREAMCONVERTF_END);
  if (res) {
    GST_WARNING_OBJECT (dec, "Failed to decode data");
    return ret;
  }

  ret = acmmp3dec_push_output (dec);
  return ret;
}

static gboolean
acmmp3dec_sink_event (GstPad * pad, GstEvent * event)
{
  ACMMP3Dec *dec = (ACMMP3Dec *) GST_PAD_PARENT (pad);

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_EOS:
      acmmp3dec_finish_stream (dec);
      break;
    case GST_EVENT_FLUSH_STOP:
      if (dec->stream)
        acmStreamReset (dec->stream, 0);
      dec->timestamp = GST_CLOCK_TIME_NONE;
      break;
    default:
      break;
  }


  return gst_pad_push_event (dec->srcpad, event);
}

static void
acmmp3dec_dispose (GObject * obj)
{
  ACMMP3Dec *dec = (ACMMP3Dec *) obj;

  if (dec->is_setup)
    acmmp3dec_teardown (dec);

  G_OBJECT_CLASS (parent_class)->dispose (obj);
}

static void
acmmp3dec_init (ACMMP3Dec * dec, ACMMP3DecClass * decclass)
{
  dec->sinkpad =
      gst_pad_new_from_static_template (&acmmp3dec_sink_template, "sink");
  gst_pad_set_setcaps_function (dec->sinkpad,
      GST_DEBUG_FUNCPTR (acmmp3dec_sink_setcaps));
  gst_pad_set_chain_function (dec->sinkpad,
      GST_DEBUG_FUNCPTR (acmmp3dec_chain));
  gst_pad_set_event_function (dec->sinkpad,
      GST_DEBUG_FUNCPTR (acmmp3dec_sink_event));
  gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);

  dec->srcpad =
      gst_pad_new_from_static_template (&acmmp3dec_src_template, "src");
  gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);

}

static void
acmmp3dec_class_init (ACMMP3DecClass * klass)
{
  GObjectClass *gobjectclass = (GObjectClass *) klass;
  gobjectclass->dispose = acmmp3dec_dispose;
}

static void
acmmp3dec_base_init (gpointer klass)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&acmmp3dec_sink_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&acmmp3dec_src_template));
  gst_element_class_set_details_simple (element_class, "ACM MP3 decoder",
      "Codec/Decoder/Audio",
      "Decode MP3 using ACM decoder",
      "Pioneers of the Inevitable <songbird@songbirdnest.com");
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  GST_DEBUG_CATEGORY_INIT (acmmp3dec_debug, "acmmp3dec", 0, "ACM Decoders");

  GST_INFO ("Registering ACM MP3 decoder");
  if (!gst_element_register (plugin, "acmmp3dec", GST_RANK_PRIMARY,
          GST_TYPE_ACM_MP3_DEC)) {
    return FALSE;
  }

  return TRUE;
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "acmmp3dec",
    "ACM MP3 Decoder",
    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)