gstreamer/sys/acmmp3dec/acmmp3dec.c

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/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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_ACM_MP3_DEC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ACM_MP3_DEC,ACMMP3DecClass))
#define GST_IS_ACM_MP3_DEC(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ACM_MP3_DEC))
#define GST_IS_ACM_MP3_DEC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ACM_MP3_DEC))
#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, "
"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;
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GType acmmp3dec_get_type (void);
#define acmmp3dec_parent_class parent_class
G_DEFINE_TYPE (ACMMP3Dec, acmmp3dec, 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, NULL);
}
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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;
}
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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);
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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,
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(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);
g_free (dec->header.pbSrc);
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);
if (!outbuf) {
GST_WARNING_OBJECT (dec, "cannot allocate a new GstBuffer");
goto done_push_output;
}
if (gst_buffer_fill (outbuf, 0, dec->header.pbDst,
dec->header.cbDstLengthUsed) != dec->header.cbDstLengthUsed) {
gst_buffer_unref (outbuf);
GST_WARNING_OBJECT (dec, "unable to fill output buffer");
goto done_push_output;
}
if (dec->timestamp != GST_CLOCK_TIME_NONE)
GST_BUFFER_TIMESTAMP (outbuf) = dec->timestamp;
GST_BUFFER_DURATION (outbuf) =
gst_util_uint64_scale_int (dec->header.cbDstLengthUsed, 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)));
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");
done_push_output:
return ret;
}
static GstFlowReturn
acmmp3dec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
MMRESULT res;
ACMMP3Dec *dec = (ACMMP3Dec *) GST_PAD_PARENT (pad);
GstMapInfo map;
GstFlowReturn ret = GST_FLOW_OK;
gst_buffer_map (buf, &map, GST_MAP_READ);
if (map.size > 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, map.data, map.size);
dec->header.cbSrcLength = map.size;
/* 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_unmap (buf, &map);
gst_buffer_unref (buf);
return ret;
}
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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, GstObject * parent, GstEvent * event)
{
ACMMP3Dec *dec = (ACMMP3Dec *) GST_PAD_PARENT (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
return acmmp3dec_sink_setcaps (pad, caps);
}
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)
{
dec->sinkpad =
gst_pad_new_from_static_template (&acmmp3dec_sink_template, "sink");
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;
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gobjectclass->dispose = acmmp3dec_dispose;
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_static_metadata (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)