path: root/sys/acmmp3dec/acmmp3dec.c

/* 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 const GstElementDetails acmmp3dec_details =
    
GST_ELEMENT_DETAILS ("ACM MP3 decoder", 
"Codec/Decoder/Audio",
    
"Decode MP3 using ACM decoder",
    
"Pioneers of the Inevitable <songbird@songbirdnest.com");


static GstStaticPadTemplate acmmp3dec_sink_template =
    
GST_STATIC_PAD_TEMPLATE ("sink", 
GST_PAD_SINK, 
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_src_template =
    
GST_STATIC_PAD_TEMPLATE ("src", 
GST_PAD_SRC, 
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;
  

WAVEFORMATEX infmt;
  
WAVEFORMATEX * outfmt;
  

HACMDRIVER driver;
  
HACMSTREAM stream;
  
ACMSTREAMHEADER header;
  

      /* Offset into input buffer to write next data */ 
  int offset;
   
      /* Number of bytes written */ 
  int bytes_output;
   

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

      /* Set in properties */ 
  int selected_bitrate;
   

GstCaps * output_caps;
 
} ACMMP3Dec;


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);

}



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 = 0;
  
dec->infmt.wfx.nBlockAlign = 0;
  
dec->infmt.wfx.wBitsPerSample = 16;
  
dec->infmt.wfx.cbSize = MPEGLAYER3_WFX_EXTRA_BYTES;
  
dec->infmt.wID = MPEGLAYER3_ID_MPEG;
  
dec->infmt.fdwFlags = MPEGLAYER3_FLAG_PADDING_OFF;   // ??
  dec->infmt.nBlockSize = 0;    // Damn, need to figure this out... Does this
  // even make sense for vbr files? Various random
  // things suggest 417 for no apparent reason?
  // That's the right value for an unpadded
  // 128 kbps 44.1kHz stream I think. Let's try
  // zero to see if it works though. Or one?
  dec->infmt.nFramesPerBlock = 1;
  
dec->infmt.nCodecDelay = 0;  /* Apparently no way to know the correct 
                                   value to put here! Encoder-specific and not
                                   stored in the bitstream. */
  

return TRUE;

}



gboolean acmmp3dec_set_output_format (ACMMP3Dec * dec,
    WAVEFORMATEX * outfmt) 
{
  
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 = 4;
  
dec->outfmt.wBitsPerSample = 16;
  
dec->outfmt.cbSize = 0;
  

return TRUE;

}


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


TODO:Get driverId 
      
res = acmDriverOpen (&dec->driver, decclass->driverId, 0);
  
if (res) {
    
GST_WARNING ("Failed to open ACM driver: %d", res);
    
return FALSE;
  
}
  

acmmp3dec_set_input_format (dec, &dec->infmt);
  
acmmp3dec_set_output_format (dec, &dec->outfmt);
  

res =
      acmStreamOpen (&dec->stream, dec->driver, &dec->infmt, dec->outfmt, 
0, 0,
      0, ACM_STREAMOPENF_NONREALTIME);
  
if (res) {
    
GST_WARNING_OBJECT (dec, "Failed to open ACM stream");
    
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, 
&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->is_setup = TRUE;
  
return TRUE;

}


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

if (dec->output_caps) {
    
gst_caps_unref (dec->output_caps);
    
dec->output_caps = NULL;
  
}
  

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;
  
}
  
if (dec->driver) {
    
acmDriverClose (dec->driver, 0);
    
dec->driver = 0;
  
}
  

dec->bytes_output = 0;
  
dec->offset = 0;
  
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);
  

dec->bytes_per_sample = dec->channels * dec->rate * 2;      /* 16 bit output */
  

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);
    

GST_BUFFER_TIMESTAMP (outbuf) = dec->timestamp;
    
GST_BUFFER_DURATION (outbuf) =
        gst_util_uint64_scale_int (
GST_BUFFER_SIZE (outbuf), GST_SECOND,
        dec->bytes_per_sample);
    

dec->timestamp += GST_BUFFER_DURATION (outbuf);
    

GST_DEBUG_OBJECT (dec, "Pushing %d byte decoded buffer",
        
dec->header.cbDstLengthUsed);
    
ret = gst_pad_push (dec->srcpad, outbuf);
  
}
  

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);
  
int chunklen;
  
GstFlowReturn ret = GST_FLOW_OK;
  

if (len > ACM_BUFFER_SIZE) {
    
GST_WARNING_OBJECT (dec, "Impossibly large mp3 frame!");
    
return GST_FLOW_ERROR;
  
}
  

if (GST_BUFFER_TIMESTAMP (buf) != GST_CLOCK_TIME_NONE) {
    
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");
    
return GST_FLOW_OK;        /* Maybe it was just a corrupt frame */
  
}
  

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 */ 
          return GST_FLOW_ERROR;
    
}
    

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

}



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

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);
  
gboolean res;
  

switch (GST_EVENT_TYPE (event)) {
    
case GST_EVENT_EOS:
      
acmmp3dec_finish_stream (dec);
      

res = gst_pad_push_event (dec->srcpad, event);
      
break;
    
case GST_EVENT_FLUSH_STOP:
      
breal;
    
default:
      
res = gst_pad_push_event (dec->srcpad, event);
      
break;
  
}
  

return res;

}


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

G_OBJECT_CLASS (parent_class)->dispose (obj);

} 

static void 

acmmp3dec_init (ACMMP3Dec * dec) 
{
  
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 (ACMMP3DecClass * 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 (element_class, &acmmp3dec_details);

} 

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_ '