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gstreamer/ext/mad/gstmad.c
Benjamin Otte 33da588e1b rework id3tag plugin to work as a) parser - just strip id3 tags b) tag reader - extract tags and go EOS c) tag writer... 
Original commit message from CVS:
rework id3tag plugin to work as
a) parser - just strip id3 tags
b) tag reader - extract tags and go EOS
c) tag writer - change id3 tags
Included is some revamping to ease code to make it possible to strip id3tag from its mad dependency (without ID3v2 support), which would still make the parsing bits work. This is however not done yet.
This plugin supercedes the id3types plugin.
2003-12-09 16:33:52 +00:00

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/* GStreamer
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstmad.h"
#define GST_TYPE_MAD \
(gst_mad_get_type())
#define GST_MAD(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MAD,GstMad))
#define GST_MAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MAD,GstMad))
#define GST_IS_MAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MAD))
#define GST_IS_MAD_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MAD))
typedef struct _GstMad GstMad;
typedef struct _GstMadClass GstMadClass;
struct _GstMad {
GstElement element;
/* pads */
GstPad *sinkpad, *srcpad;
/* state */
struct mad_stream stream;
struct mad_frame frame;
struct mad_synth synth;
guchar *tempbuffer;
glong tempsize; /* used to keep track of partial buffers */
gboolean need_sync;
GstClockTime last_ts;
guint64 base_byte_offset;
guint64 bytes_consumed; /* since the base_byte_offset */
guint64 total_samples; /* the number of samples since the sync point */
gboolean restart;
guint64 segment_start;
/* info */
struct mad_header header;
gboolean new_header;
guint framecount;
gint vbr_average; /* average bitrate */
guint64 vbr_rate; /* average * framecount */
gboolean half;
gboolean ignore_crc;
GstTagList * tags;
/* negotiated format */
gint rate;
gint channels;
GstIndex *index;
gint index_id;
};
struct _GstMadClass {
GstElementClass parent_class;
};
/* elementfactory information */
static GstElementDetails gst_mad_details = GST_ELEMENT_DETAILS (
"mad mp3 decoder",
"Codec/Decoder/Audio",
"Uses mad code to decode mp3 streams",
"Wim Taymans <wim.taymans@chello.be>"
);
/* Mad signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_HALF,
ARG_IGNORE_CRC,
ARG_METADATA,
ARG_STREAMINFO
/* FILL ME */
};
GST_PAD_TEMPLATE_FACTORY (mad_src_template_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"mad_src",
"audio/x-raw-int",
"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_PAD_TEMPLATE_FACTORY (mad_sink_template_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"mad_sink",
"audio/mpeg",
/* we don't need channel/rate ... */
"mpegversion", GST_PROPS_INT (1),
"layer", GST_PROPS_INT_RANGE (1, 3)
)
)
static void gst_mad_base_init (gpointer g_class);
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_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_mad_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static gboolean gst_mad_src_event (GstPad *pad, GstEvent *event);
static const GstFormat*
gst_mad_get_formats (GstPad *pad);
static const GstEventMask*
gst_mad_get_event_masks (GstPad *pad);
static const GstQueryType*
gst_mad_get_query_types (GstPad *pad);
static gboolean gst_mad_src_query (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value);
static gboolean gst_mad_convert_sink (GstPad *pad, GstFormat src_format,
gint64 src_value, GstFormat
*dest_format, gint64 *dest_value);
static gboolean gst_mad_convert_src (GstPad *pad, GstFormat src_format,
gint64 src_value, GstFormat
*dest_format, gint64 *dest_value);
static void gst_mad_chain (GstPad *pad, GstData *_data);
static GstElementStateReturn
gst_mad_change_state (GstElement *element);
static void gst_mad_set_index (GstElement *element, GstIndex *index);
static GstIndex* gst_mad_get_index (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),
gst_mad_base_init,
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;
}
#define GST_TYPE_MAD_LAYER (gst_mad_layer_get_type())
G_GNUC_UNUSED static GType
gst_mad_layer_get_type(void) {
static GType mad_layer_type = 0;
static GEnumValue mad_layer[] = {
{0, "0", "Unknown"},
{MAD_LAYER_I, "1", "I"},
{MAD_LAYER_II, "2", "II"},
{MAD_LAYER_III, "3", "III"},
{0, NULL, NULL},
};
if (!mad_layer_type) {
mad_layer_type = g_enum_register_static("GstMadLayer", mad_layer);
}
return mad_layer_type;
}
#define GST_TYPE_MAD_MODE (gst_mad_mode_get_type())
G_GNUC_UNUSED static GType
gst_mad_mode_get_type(void) {
static GType mad_mode_type = 0;
static GEnumValue mad_mode[] = {
{-1, "-1", "Unknown"},
{MAD_MODE_SINGLE_CHANNEL, "0", "Single Channel"},
{MAD_MODE_DUAL_CHANNEL , "1", "Dual Channel"},
{MAD_MODE_JOINT_STEREO , "2", "Joint Stereo"},
{MAD_MODE_STEREO , "3", "Stereo"},
{ 0, NULL, NULL},
};
if (!mad_mode_type) {
mad_mode_type = g_enum_register_static("GstMadMode", mad_mode);
}
return mad_mode_type;
}
#define GST_TYPE_MAD_EMPHASIS (gst_mad_emphasis_get_type())
G_GNUC_UNUSED static GType
gst_mad_emphasis_get_type(void) {
static GType mad_emphasis_type = 0;
static GEnumValue mad_emphasis[] = {
{-1, "-1", "Unknown"},
{MAD_EMPHASIS_NONE, "0", "None"},
{MAD_EMPHASIS_50_15_US, "1", "50/15 Microseconds"},
{MAD_EMPHASIS_CCITT_J_17, "2", "CCITT J.17"},
{ 0, NULL, NULL},
};
if (!mad_emphasis_type) {
mad_emphasis_type = g_enum_register_static("GstMadEmphasis", mad_emphasis);
}
return mad_emphasis_type;
}
static void
gst_mad_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
GST_PAD_TEMPLATE_GET (mad_sink_template_factory));
gst_element_class_add_pad_template (element_class,
GST_PAD_TEMPLATE_GET (mad_src_template_factory));
gst_element_class_set_details (element_class, &gst_mad_details);
}
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->set_property = gst_mad_set_property;
gobject_class->get_property = gst_mad_get_property;
gobject_class->dispose = gst_mad_dispose;
gstelement_class->change_state = gst_mad_change_state;
gstelement_class->set_index = gst_mad_set_index;
gstelement_class->get_index = gst_mad_get_index;
/* init properties */
/* currently, string representations are used, we might want to change that */
/* FIXME: descriptions need to be more technical,
* default values and ranges need to be selected right */
g_object_class_install_property (gobject_class, ARG_HALF,
g_param_spec_boolean ("half", "Half", "Generate PCM at 1/2 sample rate",
FALSE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_IGNORE_CRC,
g_param_spec_boolean ("ignore_crc", "Ignore CRC", "Ignore CRC errors",
FALSE, G_PARAM_READWRITE));
}
static void
gst_mad_init (GstMad *mad)
{
/* create the sink and src pads */
mad->sinkpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (mad_sink_template_factory), "sink");
gst_element_add_pad (GST_ELEMENT (mad), mad->sinkpad);
gst_pad_set_chain_function (mad->sinkpad, GST_DEBUG_FUNCPTR (gst_mad_chain));
gst_pad_set_convert_function (mad->sinkpad, GST_DEBUG_FUNCPTR (gst_mad_convert_sink));
gst_pad_set_formats_function (mad->sinkpad, GST_DEBUG_FUNCPTR (gst_mad_get_formats));
mad->srcpad = gst_pad_new_from_template(
GST_PAD_TEMPLATE_GET (mad_src_template_factory), "src");
gst_element_add_pad (GST_ELEMENT (mad), mad->srcpad);
gst_pad_set_event_function (mad->srcpad, GST_DEBUG_FUNCPTR (gst_mad_src_event));
gst_pad_set_event_mask_function (mad->srcpad, GST_DEBUG_FUNCPTR (gst_mad_get_event_masks));
gst_pad_set_query_function (mad->srcpad, GST_DEBUG_FUNCPTR (gst_mad_src_query));
gst_pad_set_query_type_function (mad->srcpad, GST_DEBUG_FUNCPTR (gst_mad_get_query_types));
gst_pad_set_convert_function (mad->srcpad, GST_DEBUG_FUNCPTR (gst_mad_convert_src));
gst_pad_set_formats_function (mad->srcpad, GST_DEBUG_FUNCPTR (gst_mad_get_formats));
mad->tempbuffer = g_malloc (MAD_BUFFER_MDLEN * 3);
mad->tempsize = 0;
mad->need_sync = TRUE;
mad->base_byte_offset = 0;
mad->bytes_consumed = 0;
mad->total_samples = 0;
mad->new_header = TRUE;
mad->framecount = 0;
mad->vbr_average = 0;
mad->vbr_rate = 0;
mad->restart = FALSE;
mad->segment_start = 0;
mad->header.mode = -1;
mad->header.emphasis = -1;
mad->tags = NULL;
mad->half = FALSE;
mad->ignore_crc = FALSE;
GST_FLAG_SET (mad, GST_ELEMENT_EVENT_AWARE);
}
static void
gst_mad_dispose (GObject *object)
{
GstMad *mad = GST_MAD (object);
gst_mad_set_index (GST_ELEMENT (object), NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
g_free (mad->tempbuffer);
}
static void
gst_mad_set_index (GstElement *element, GstIndex *index)
{
GstMad *mad = GST_MAD (element);
mad->index = index;
if (index)
gst_index_get_writer_id (index, GST_OBJECT (element), &mad->index_id);
}
static GstIndex*
gst_mad_get_index (GstElement *element)
{
GstMad *mad = GST_MAD (element);
return mad->index;
}
static const GstFormat*
gst_mad_get_formats (GstPad *pad)
{
static const GstFormat src_formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_DEFAULT,
GST_FORMAT_TIME,
0
};
static const GstFormat sink_formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
return (GST_PAD_IS_SRC (pad) ? src_formats : sink_formats);
}
static const GstEventMask*
gst_mad_get_event_masks (GstPad *pad)
{
static const GstEventMask gst_mad_src_event_masks[] = {
{ GST_EVENT_SEEK, GST_SEEK_METHOD_SET |
GST_SEEK_FLAG_FLUSH },
{ 0, }
};
return gst_mad_src_event_masks;
}
static gboolean
gst_mad_convert_sink (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
gboolean res = TRUE;
GstMad *mad;
mad = GST_MAD (gst_pad_get_parent (pad));
if (mad->vbr_average == 0)
return FALSE;
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
/* multiply by 8 because vbr is in bits/second */
*dest_value = src_value * 8 * GST_SECOND / mad->vbr_average;
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
/* multiply by 8 because vbr is in bits/second */
*dest_value = src_value * mad->vbr_average / (8 * GST_SECOND);
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static gboolean
gst_mad_convert_src (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
gboolean res = TRUE;
guint scale = 1;
gint bytes_per_sample;
GstMad *mad;
mad = GST_MAD (gst_pad_get_parent (pad));
bytes_per_sample = MAD_NCHANNELS (&mad->frame.header) << 1;
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
if (bytes_per_sample == 0)
return FALSE;
*dest_value = src_value / bytes_per_sample;
break;
case GST_FORMAT_TIME:
{
gint byterate = bytes_per_sample * mad->frame.header.samplerate;
if (byterate == 0)
return FALSE;
*dest_value = src_value * GST_SECOND / byterate;
break;
}
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_BYTES:
*dest_value = src_value * bytes_per_sample;
break;
case GST_FORMAT_TIME:
if (mad->frame.header.samplerate == 0)
return FALSE;
*dest_value = src_value * GST_SECOND / mad->frame.header.samplerate;
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
scale = bytes_per_sample;
/* fallthrough */
case GST_FORMAT_DEFAULT:
*dest_value = src_value * scale * mad->frame.header.samplerate / GST_SECOND;
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static const GstQueryType*
gst_mad_get_query_types (GstPad *pad)
{
static const GstQueryType gst_mad_src_query_types[] = {
GST_QUERY_TOTAL,
GST_QUERY_POSITION,
0
};
return gst_mad_src_query_types;
}
static gboolean
gst_mad_src_query (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value)
{
gboolean res = TRUE;
GstMad *mad;
mad = GST_MAD (gst_pad_get_parent (pad));
switch (type) {
case GST_QUERY_TOTAL:
{
switch (*format) {
case GST_FORMAT_BYTES:
case GST_FORMAT_DEFAULT:
case GST_FORMAT_TIME:
{
gint64 peer_value;
const GstFormat *peer_formats;
res = FALSE;
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mad->sinkpad));
while (peer_formats && *peer_formats && !res) {
GstFormat peer_format = *peer_formats;
/* do the probe */
if (gst_pad_query (GST_PAD_PEER (mad->sinkpad), GST_QUERY_TOTAL,
&peer_format, &peer_value))
{
GstFormat conv_format;
/* convert to TIME */
conv_format = GST_FORMAT_TIME;
res = gst_pad_convert (mad->sinkpad,
peer_format, peer_value,
&conv_format, value);
/* and to final format */
res &= gst_pad_convert (pad,
GST_FORMAT_TIME, *value,
format, value);
}
peer_formats++;
}
break;
}
default:
res = FALSE;
break;
}
break;
}
case GST_QUERY_POSITION:
switch (*format) {
default:
{
/* we only know about our samples, convert to requested format */
res &= gst_pad_convert (pad,
GST_FORMAT_DEFAULT, mad->total_samples,
format, value);
break;
}
}
break;
default:
res = FALSE;
break;
}
return res;
}
static gboolean
index_seek (GstMad *mad, GstPad *pad, GstEvent *event)
{
/* since we know the exact byteoffset of the frame,
make sure to try bytes first */
const GstFormat try_all_formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
const GstFormat *try_formats = try_all_formats;
const GstFormat *peer_formats;
GstIndexEntry *entry =
gst_index_get_assoc_entry (mad->index, mad->index_id,
GST_INDEX_LOOKUP_BEFORE, 0,
GST_EVENT_SEEK_FORMAT (event),
GST_EVENT_SEEK_OFFSET (event));
if (!entry)
return FALSE;
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mad->sinkpad));
while (gst_formats_contains (peer_formats, *try_formats)) {
gint64 value;
GstEvent *seek_event;
if (gst_index_entry_assoc_map (entry, *try_formats, &value)) {
/* lookup succeeded, create the seek */
GST_DEBUG ("index %s %" G_GINT64_FORMAT
" -> %s %" G_GINT64_FORMAT,
gst_format_get_details (GST_EVENT_SEEK_FORMAT (event))->nick,
GST_EVENT_SEEK_OFFSET (event),
gst_format_get_details (*try_formats)->nick,
value);
seek_event = gst_event_new_seek (*try_formats |
GST_SEEK_METHOD_SET |
GST_SEEK_FLAG_FLUSH, value);
if (gst_pad_send_event (GST_PAD_PEER (mad->sinkpad), seek_event)) {
/* seek worked, we're done, loop will exit */
mad->restart = TRUE;
g_assert (GST_EVENT_SEEK_FORMAT (event) == GST_FORMAT_TIME);
mad->segment_start = GST_EVENT_SEEK_OFFSET (event);
return TRUE;
}
}
try_formats++;
}
return FALSE;
}
static gboolean
normal_seek (GstMad *mad, GstPad *pad, GstEvent *event)
{
gint64 src_offset;
gboolean flush;
GstFormat format;
const GstFormat *peer_formats;
gboolean res;
format = GST_FORMAT_TIME;
/* first bring the src_format to TIME */
if (!gst_pad_convert (pad,
GST_EVENT_SEEK_FORMAT (event), GST_EVENT_SEEK_OFFSET (event),
&format, &src_offset))
{
/* didn't work, probably unsupported seek format then */
return FALSE;
}
/* shave off the flush flag, we'll need it later */
flush = GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH;
/* assume the worst */
res = FALSE;
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mad->sinkpad));
/* while we did not exhaust our seek formats without result */
while (peer_formats && *peer_formats && !res) {
gint64 desired_offset;
format = *peer_formats;
/* try to convert requested format to one we can seek with on the sinkpad */
if (gst_pad_convert (mad->sinkpad, GST_FORMAT_TIME, src_offset,
&format, &desired_offset))
{
GstEvent *seek_event;
/* conversion succeeded, create the seek */
seek_event = gst_event_new_seek (format | GST_SEEK_METHOD_SET | flush,
desired_offset);
/* do the seek */
if (gst_pad_send_event (GST_PAD_PEER (mad->sinkpad), seek_event)) {
/* seek worked, we're done, loop will exit */
res = TRUE;
}
}
/* at this point, either the seek worked or res == FALSE */
if (res)
/* we need to break out of the processing loop on flush */
mad->restart = flush;
peer_formats++;
}
return res;
}
static gboolean
gst_mad_src_event (GstPad *pad, GstEvent *event)
{
gboolean res = TRUE;
GstMad *mad;
mad = GST_MAD (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK_SEGMENT:
gst_event_ref (event);
if (gst_pad_send_event (GST_PAD_PEER (mad->sinkpad), event)) {
/* seek worked, we're done, loop will exit */
res = TRUE;
}
break;
/* the all-formats seek logic */
case GST_EVENT_SEEK:
if (mad->index)
res = index_seek (mad, pad, event);
else
res = normal_seek (mad, pad, event);
break;
default:
res = FALSE;
break;
}
gst_event_unref (event);
return res;
}
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);
}
/* do we need this function? */
static void
gst_mad_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec)
{
GstMad *mad;
g_return_if_fail (GST_IS_MAD (object));
mad = GST_MAD (object);
switch (prop_id) {
case ARG_HALF:
mad->half = g_value_get_boolean (value);
break;
case ARG_IGNORE_CRC:
mad->ignore_crc = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mad_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
GstMad *mad;
g_return_if_fail (GST_IS_MAD (object));
mad = GST_MAD (object);
switch (prop_id) {
case ARG_HALF:
g_value_set_boolean (value, mad->half);
break;
case ARG_IGNORE_CRC:
g_value_set_boolean (value, mad->ignore_crc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mad_update_info (GstMad *mad)
{
gint abr = mad->vbr_average;
struct mad_header *header = &mad->frame.header;
gboolean changed = FALSE;
#define CHECK_HEADER(h1,str) \
G_STMT_START{ \
if (mad->header.h1 != header->h1 || mad->new_header) { \
mad->header.h1 = header->h1; \
changed = TRUE; \
}; \
} G_STMT_END
/* update average bitrate */
if (mad->new_header) {
mad->framecount = 1;
mad->vbr_rate = header->bitrate;
abr = 0;
} else {
mad->framecount++;
mad->vbr_rate += header->bitrate;
}
mad->vbr_average = (gint) (mad->vbr_rate / mad->framecount);
CHECK_HEADER (layer, "layer");
CHECK_HEADER (mode, "mode");
CHECK_HEADER (emphasis, "emphasis");
if (header->bitrate != mad->header.bitrate || mad->new_header) {
mad->header.bitrate = header->bitrate;
}
mad->new_header = FALSE;
#undef CHECK_HEADER
}
static void
gst_mad_handle_event (GstPad *pad, GstBuffer *buffer)
{
GstEvent *event = GST_EVENT (buffer);
GstMad *mad = GST_MAD (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event))
{
case GST_EVENT_DISCONTINUOUS:
{
gint n = GST_EVENT_DISCONT_OFFSET_LEN (event);
gint i;
mad->total_samples = 0;
for (i = 0; i < n; i++)
{
const GstFormat *formats;
formats = gst_pad_get_formats (pad);
if (gst_formats_contains (formats, GST_EVENT_DISCONT_OFFSET(event, i).format))
{
gint64 value = GST_EVENT_DISCONT_OFFSET (event, i).value;
gint64 time;
GstFormat format;
GstEvent *discont;
/* see how long the input bytes take */
format = GST_FORMAT_TIME;
if (!gst_pad_convert (pad,
GST_EVENT_DISCONT_OFFSET (event, i).format,
value, &format, &time))
{
time = 0;
}
/* for now, this is the best we can do to get the total number
* of samples */
format = GST_FORMAT_DEFAULT;
if (!gst_pad_convert (mad->srcpad,
GST_FORMAT_TIME, time, &format, &mad->total_samples))
{
mad->total_samples = 0;
}
gst_event_unref (event);
if (GST_PAD_IS_USABLE (mad->srcpad))
{
discont = gst_event_new_discontinuous (FALSE, GST_FORMAT_TIME,
time, NULL);
gst_pad_push (mad->srcpad, GST_DATA (discont));
}
break;
}
}
mad->tempsize = 0;
/* we don't need to restart when we get here */
mad->restart = FALSE;
break;
}
default:
gst_pad_event_default (pad, event);
break;
}
return;
}
static gboolean
gst_mad_check_restart (GstMad *mad)
{
gboolean yes = mad->restart;
if (mad->restart) {
mad->restart = FALSE;
mad->tempsize = 0;
}
return yes;
}
static void
gst_mad_chain (GstPad *pad, GstData *_data)
{
GstBuffer *buffer = GST_BUFFER (_data);
GstMad *mad;
gchar *data;
glong size;
gboolean new_pts = FALSE;
GstClockTime timestamp;
mad = GST_MAD (gst_pad_get_parent (pad));
g_return_if_fail (GST_IS_MAD (mad));
/* handle events */
if (GST_IS_EVENT (buffer))
{
gst_mad_handle_event (pad, buffer);
return;
}
gst_mad_check_restart (mad);
timestamp = GST_BUFFER_TIMESTAMP (buffer);
/* handle timestamps */
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* if there is nothing queued (partial buffer), we prepare to set the
* timestamp on the next buffer */
if (mad->tempsize == 0) {
/* we have to save the result here because we can't yet convert the timestamp
* to a sample offset yet, the samplerate might not be known yet */
mad->last_ts = timestamp;
mad->base_byte_offset = GST_BUFFER_OFFSET (buffer);
mad->bytes_consumed = 0;
}
/* else we need to finish the current partial frame with the old timestamp
* and queue this timestamp for the next frame */
else {
new_pts = TRUE;
}
}
/* handle data */
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
/* process the incoming buffer in chunks of maximum MAD_BUFFER_MDLEN bytes;
* this is the upper limit on processable chunk sizes set by mad */
while (size > 0)
{
gint tocopy;
guchar *mad_input_buffer;
tocopy = MIN (MAD_BUFFER_MDLEN, size);
/* append the chunk to process to our internal temporary buffer */
memcpy (mad->tempbuffer + mad->tempsize, data, tocopy);
mad->tempsize += tocopy;
/* update our incoming buffer's parameters to reflect this */
size -= tocopy;
data += tocopy;
mad_input_buffer = mad->tempbuffer;
/* while we have data we can consume it */
while (mad->tempsize >= 0) {
gint consumed;
guint nchannels;
guint nsamples;
gint rate;
guint64 time_offset;
guint64 time_duration;
mad_stream_buffer (&mad->stream, mad_input_buffer, mad->tempsize);
if (mad_frame_decode (&mad->frame, &mad->stream) == -1) {
/* not enough data, need to wait for next buffer? */
if (mad->stream.error == MAD_ERROR_BUFLEN) {
break;
}
if (!MAD_RECOVERABLE (mad->stream.error)) {
gst_element_error (GST_ELEMENT (mad), "fatal error decoding stream");
return;
}
else if (mad->stream.error == MAD_ERROR_LOSTSYNC) {
/* lost sync, force a resync */
signed long tagsize;
tagsize = id3_tag_query (mad->stream.this_frame,
mad->stream.bufend - mad->stream.this_frame);
if (tagsize > mad->tempsize) {
GST_INFO ("mad: got partial id3 tag in buffer, skipping");
}
else if (tagsize > 0) {
struct id3_tag *tag;
id3_byte_t const *data;
GST_INFO ("mad: got ID3 tag size %ld", tagsize);
data = mad->stream.this_frame;
/* mad has moved the pointer to the next frame over the start of the
* id3 tags, so we need to flush one byte less than the tagsize */
mad_stream_skip (&mad->stream, tagsize - 1);
tag = id3_tag_parse (data, tagsize);
if (tag) {
GstTagList *list;
list = gst_mad_id3_to_tag_list (tag);
id3_tag_delete (tag);
GST_DEBUG_OBJECT (mad, "found tag");
gst_element_found_tags (GST_ELEMENT (mad), list);
if (mad->tags) {
gst_tag_list_insert (mad->tags, list, GST_TAG_MERGE_PREPEND);
} else {
mad->tags = gst_tag_list_copy (list);
}
if (GST_PAD_IS_USABLE (mad->srcpad)) {
gst_pad_push (mad->srcpad, GST_DATA (gst_event_new_tag (list)));
} else {
gst_tag_list_free (list);
}
}
}
}
mad_frame_mute (&mad->frame);
mad_synth_mute (&mad->synth);
mad_stream_sync (&mad->stream);
/* recoverable errors pass */
goto next;
}
nchannels = MAD_NCHANNELS (&mad->frame.header);
nsamples = MAD_NSBSAMPLES (&mad->frame.header) *
(mad->stream.options & MAD_OPTION_HALFSAMPLERATE ? 16 : 32);
#if MAD_VERSION_MINOR <= 12
rate = mad->header.sfreq;
#else
rate = mad->frame.header.samplerate;
#endif
gst_mad_update_info (mad);
if (mad->channels != nchannels || mad->rate != rate) {
if (mad->stream.options & MAD_OPTION_HALFSAMPLERATE)
rate >>=1;
/* we set the caps even when the pad is not connected so they
* can be gotten for streaminfo */
if (gst_pad_try_set_caps (mad->srcpad,
gst_caps_new (
"mad_src",
"audio/x-raw-int",
gst_props_new (
"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 (rate),
"channels", GST_PROPS_INT (nchannels),
NULL))) <= 0)
{
if (!gst_pad_recover_caps_error (mad->srcpad, NULL)) {
gst_buffer_unref (buffer);
return;
}
}
mad->channels = nchannels;
mad->rate = rate;
}
if (mad->frame.header.samplerate == 0) {
g_warning ("mad->frame.header.samplerate is 0; timestamps cannot be calculated");
time_offset = GST_CLOCK_TIME_NONE;
time_duration = GST_CLOCK_TIME_NONE;
}
else {
/* if we have a pending timestamp, we can use it now to calculate the sample offset */
if (GST_CLOCK_TIME_IS_VALID (mad->last_ts)) {
GstFormat format = GST_FORMAT_DEFAULT;
gst_pad_convert (mad->srcpad, GST_FORMAT_TIME, mad->last_ts, &format, &mad->total_samples);
mad->last_ts = GST_CLOCK_TIME_NONE;
}
time_offset = mad->total_samples * GST_SECOND
/ mad->frame.header.samplerate;
time_duration = (nsamples * GST_SECOND
/ mad->frame.header.samplerate);
}
if (mad->index) {
guint64 x_bytes = mad->base_byte_offset + mad->bytes_consumed;
gst_index_add_association (mad->index, mad->index_id, 0,
GST_FORMAT_BYTES, x_bytes,
GST_FORMAT_TIME, time_offset,
NULL);
}
if (GST_PAD_IS_USABLE (mad->srcpad) &&
mad->segment_start <= (time_offset == GST_CLOCK_TIME_NONE ? 0 : time_offset)) {
/* for sample accurate seeking, calculate how many samples
to skip and send the remaining pcm samples */
GstBuffer *outbuffer;
gint16 *outdata;
mad_fixed_t const *left_ch, *right_ch;
mad_synth_frame (&mad->synth, &mad->frame);
left_ch = mad->synth.pcm.samples[0];
right_ch = mad->synth.pcm.samples[1];
outbuffer = gst_buffer_new_and_alloc (nsamples * nchannels * 2);
outdata = (gint16 *) GST_BUFFER_DATA (outbuffer);
GST_BUFFER_TIMESTAMP (outbuffer) = time_offset;
GST_BUFFER_DURATION (outbuffer) = time_duration;
GST_BUFFER_OFFSET (outbuffer) = mad->total_samples;
/* output sample(s) in 16-bit signed native-endian PCM */
if (nchannels == 1) {
gint count = nsamples;
while (count--) {
*outdata++ = scale(*left_ch++) & 0xffff;
}
}
else {
gint count = nsamples;
while (count--) {
*outdata++ = scale(*left_ch++) & 0xffff;
*outdata++ = scale(*right_ch++) & 0xffff;
}
}
gst_pad_push (mad->srcpad, GST_DATA (outbuffer));
}
mad->total_samples += nsamples;
/* we have a queued timestamp on the incoming buffer that we should
* use for the next frame */
if (new_pts) {
mad->last_ts = timestamp;
new_pts = FALSE;
mad->base_byte_offset = GST_BUFFER_OFFSET (buffer);
mad->bytes_consumed = 0;
}
if (gst_mad_check_restart (mad)) {
goto end;
}
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;
mad->bytes_consumed += consumed;
}
memmove (mad->tempbuffer, mad_input_buffer, mad->tempsize);
}
end:
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:
{
guint options = 0;
mad_stream_init (&mad->stream);
mad_frame_init (&mad->frame);
mad_synth_init (&mad->synth);
mad->tempsize = 0;
mad->total_samples = 0;
mad->rate = 0;
mad->channels = 0;
mad->vbr_average = 0;
mad->segment_start = 0;
mad->new_header = TRUE;
mad->framecount = 0;
mad->vbr_rate = 0;
mad->frame.header.samplerate = 0;
mad->last_ts = GST_CLOCK_TIME_NONE;
if (mad->ignore_crc) options |= MAD_OPTION_IGNORECRC;
if (mad->half) options |= MAD_OPTION_HALFSAMPLERATE;
mad_stream_options (&mad->stream, options);
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);
mad->restart = TRUE;
if (mad->tags) {
gst_tag_list_free (mad->tags);
mad->tags = NULL;
}
break;
case GST_STATE_READY_TO_NULL:
break;
}
return parent_class->change_state (element);
}
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