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gstreamer/ext/mad/gstmad.c
Wim Taymans ee1612fb38 Use the low-level mad API to create a chain based plugin that does less memcpy's and memove's. 
Original commit message from CVS:
Use the low-level mad API to create a chain based plugin that does less
memcpy's and memove's.
2001-12-28 01:59:26 +00:00

372 lines
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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#include <string.h>
#include "gstmad.h"
/* elementfactory information */
static GstElementDetails gst_mad_details = {
"mad mp3 decoder",
"Filter/Decoder/Audio",
"Uses mad code to decode mp3 streams",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(C) 2001",
};
/* Mad signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
GST_PADTEMPLATE_FACTORY (mad_src_template_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"mad_src",
"audio/raw",
"format", GST_PROPS_STRING ("int"),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_INT (16),
"depth", GST_PROPS_INT (16),
"rate", GST_PROPS_INT_RANGE (11025, 48000),
"channels", GST_PROPS_INT_RANGE (1, 2)
)
)
GST_PADTEMPLATE_FACTORY (mad_sink_template_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"mad_sink",
"audio/mp3",
NULL
)
)
static void gst_mad_class_init (GstMadClass *klass);
static void gst_mad_init (GstMad *mad);
static void gst_mad_dispose (GObject *object);
static void gst_mad_chain (GstPad *pad, GstBuffer *buffer);
static GstElementStateReturn
gst_mad_change_state (GstElement *element);
static GstElementClass *parent_class = NULL;
//static guint gst_mad_signals[LAST_SIGNAL] = { 0 };
GType
gst_mad_get_type (void)
{
static GType mad_type = 0;
if (!mad_type) {
static const GTypeInfo mad_info = {
sizeof(GstMadClass), NULL,
NULL,
(GClassInitFunc)gst_mad_class_init,
NULL,
NULL,
sizeof(GstMad),
0,
(GInstanceInitFunc)gst_mad_init,
};
mad_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMad", &mad_info, 0);
}
return mad_type;
}
static void
gst_mad_class_init (GstMadClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*) klass;
gstelement_class = (GstElementClass*) klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
gobject_class->dispose = gst_mad_dispose;
gstelement_class->change_state = gst_mad_change_state;
}
static void
gst_mad_init (GstMad *mad)
{
/* create the sink and src pads */
mad->sinkpad = gst_pad_new_from_template(
GST_PADTEMPLATE_GET (mad_sink_template_factory), "sink");
gst_element_add_pad(GST_ELEMENT(mad),mad->sinkpad);
gst_pad_set_caps (mad->sinkpad, gst_pad_get_padtemplate_caps (mad->sinkpad));
gst_pad_set_chain_function (mad->sinkpad, GST_DEBUG_FUNCPTR(gst_mad_chain));
mad->srcpad = gst_pad_new_from_template(
GST_PADTEMPLATE_GET (mad_src_template_factory), "src");
gst_element_add_pad(GST_ELEMENT(mad),mad->srcpad);
mad->tempbuffer = g_malloc (MAD_BUFFER_MDLEN * 3);
mad->tempsize = 0;
mad->need_sync = TRUE;
mad->last_time = 0;
mad->framestamp = 0;
mad->new_header = TRUE;
}
static void
gst_mad_dispose (GObject *object)
{
GstMad *mad = GST_MAD (object);
G_OBJECT_CLASS (parent_class)->dispose (object);
g_free (mad->tempbuffer);
}
static inline signed int
scale (mad_fixed_t sample)
{
/* round */
sample += (1L << (MAD_F_FRACBITS - 16));
/* clip */
if (sample >= MAD_F_ONE)
sample = MAD_F_ONE - 1;
else if (sample < -MAD_F_ONE)
sample = -MAD_F_ONE;
/* quantize */
return sample >> (MAD_F_FRACBITS + 1 - 16);
}
static gchar *layers[] = { "unknown", "I", "II", "III" };
static gchar *modes[] = { "single channel", "dual channel", "joint stereo", "stereo" };
static gchar *emphases[] = { "none", "50/15 microseconds", "CCITT J.17" };
static void
gst_mad_update_info (GstMad *mad, struct mad_header const *header)
{
#define CHECK_HEADER(h1,str,prop) \
G_STMT_START{ \
if (mad->header.h1 != header->h1 || mad->new_header) { \
mad->header.h1 = header->h1; \
gst_element_send_event (GST_ELEMENT (mad), \
gst_event_new_info (str, prop, NULL)); \
}; \
}G_STMT_END
CHECK_HEADER (layer, "layer", GST_PROPS_STRING (layers[header->layer]));
CHECK_HEADER (mode, "mode", GST_PROPS_STRING (modes[header->mode]));
CHECK_HEADER (emphasis, "emphasis", GST_PROPS_STRING (emphases[header->emphasis]));
CHECK_HEADER (bitrate, "bitrate", GST_PROPS_INT (header->bitrate));
CHECK_HEADER (samplerate, "samplerate", GST_PROPS_INT (header->samplerate));
if (mad->channels != MAD_NCHANNELS (header) || mad->new_header) {
mad->channels = MAD_NCHANNELS (header);
gst_element_send_event (GST_ELEMENT (mad),
gst_event_new_info ("channels", GST_PROPS_INT (mad->channels), NULL));
}
mad->new_header = FALSE;
}
static void
gst_mad_chain (GstPad *pad, GstBuffer *buffer)
{
GstMad *mad;
gchar *data;
glong size;
mad = GST_MAD (gst_pad_get_parent (pad));
/* end of new bit */
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
while (size > 0) {
gint tocopy;
guchar *mad_input_buffer;
/* cut the buffer in MDLEN pieces */
tocopy = MIN (MAD_BUFFER_MDLEN, size);
memcpy (mad->tempbuffer + mad->tempsize, data, tocopy);
mad->tempsize += tocopy;
size -= tocopy;
data += tocopy;
mad_input_buffer = mad->tempbuffer;
/* it we have enough data we can proceed */
while (mad->tempsize >= MAD_BUFFER_MDLEN) {
gint consumed;
guint nchannels, nsamples;
mad_fixed_t const *left_ch, *right_ch;
GstBuffer *outbuffer;
gint16 *outdata;
mad_stream_buffer (&mad->stream, mad_input_buffer, mad->tempsize);
if (mad_frame_decode (&mad->frame, &mad->stream) == -1) {
if (!MAD_RECOVERABLE (mad->stream.error)) {
gst_element_error (GST_ELEMENT (mad), "fatal error decoding stream");
return;
}
else {
goto next;
}
}
mad_synth_frame (&mad->synth, &mad->frame);
nchannels = MAD_NCHANNELS (&mad->frame.header);
nsamples = mad->synth.pcm.length;
left_ch = mad->synth.pcm.samples[0];
right_ch = mad->synth.pcm.samples[1];
gst_mad_update_info (mad, &mad->frame.header);
outbuffer = gst_buffer_new ();
outdata = (gint16 *) GST_BUFFER_DATA (outbuffer) = g_malloc (nsamples * nchannels * 2);
GST_BUFFER_SIZE (outbuffer) = nsamples * nchannels * 2;
GST_BUFFER_TIMESTAMP (outbuffer) = GST_BUFFER_TIMESTAMP (buffer);
/* end of new bit */
while (nsamples--) {
/* output sample(s) in 16-bit signed native-endian PCM */
*outdata++ = scale(*left_ch++) & 0xffff;
if (nchannels == 2) {
*outdata++ = scale(*right_ch++) & 0xffff;
}
}
if (GST_PAD_CAPS (mad->srcpad) == NULL) {
gst_pad_set_caps (mad->srcpad,
gst_caps_new (
"mad_src",
"audio/raw",
gst_props_new (
"format", GST_PROPS_STRING ("int"),
"law", GST_PROPS_INT (0),
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_INT (16),
"depth", GST_PROPS_INT (16),
#if MAD_VERSION_MINOR <= 12
"rate", GST_PROPS_INT (mad->header.sfreq),
#else
"rate", GST_PROPS_INT (mad->header.samplerate),
#endif
"channels", GST_PROPS_INT (nchannels),
NULL)));
}
if (GST_PAD_CONNECTED (mad->srcpad))
gst_pad_push (mad->srcpad, outbuffer);
else
gst_buffer_unref (outbuffer);
next:
/* figure out how many bytes mad consumed */
consumed = mad->stream.next_frame - mad_input_buffer;
/* move out pointer to where mad want the next data */
mad_input_buffer += consumed;
mad->tempsize -= consumed;
}
memmove (mad->tempbuffer, mad_input_buffer, mad->tempsize);
}
gst_buffer_unref (buffer);
}
static GstElementStateReturn
gst_mad_change_state (GstElement *element)
{
GstMad *mad;
mad = GST_MAD (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
mad_stream_init (&mad->stream);
mad_frame_init (&mad->frame);
mad_synth_init (&mad->synth);
break;
case GST_STATE_PAUSED_TO_PLAYING:
/* do something to get out of the chain function faster */
break;
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
mad_synth_finish (&mad->synth);
mad_frame_finish (&mad->frame);
mad_stream_finish (&mad->stream);
break;
case GST_STATE_READY_TO_NULL:
break;
}
parent_class->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
/* create an elementfactory for the mad element */
factory = gst_elementfactory_new("mad",GST_TYPE_MAD,
&gst_mad_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_elementfactory_add_padtemplate (factory,
GST_PADTEMPLATE_GET (mad_sink_template_factory));
gst_elementfactory_add_padtemplate (factory,
GST_PADTEMPLATE_GET (mad_src_template_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mad",
plugin_init
};
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