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gstreamer/ext/mad/gstmad.c
Julien Moutte 92730cb1ca ext/mad/gstmad.c: Generate a perfect stream and try to adapt to incoming timestamps lack of precision up to half a fr... 
Original commit message from CVS:
2007-03-27  Julien MOUTTE  <julien@moutte.net>

* ext/mad/gstmad.c: (gst_mad_chain): Generate a perfect
stream and try to adapt to incoming timestamps lack of
precision up to half a frame. This allows generating
a perfect stream even with muxed formats like FLV where
the timestamps are stored in milliseconds.
2007-03-27 12:02:49 +00:00

1753 lines
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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,GstMadClass))
#define GST_IS_MAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MAD))
#define GST_IS_MAD_CLASS(klass) \
(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; /* temporary buffer to serve to mad */
glong tempsize; /* running count of temp buffer size */
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 in_error; /* set when mad's in an error state */
gboolean restart;
guint64 segment_start;
gboolean need_newsegment;
/* 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, pending_rate;
gint channels, pending_channels;
gint times_pending;
gboolean caps_set; /* used to keep track of whether to change/update caps */
GstIndex *index;
gint index_id;
gboolean check_for_xing;
gboolean xing_found;
gboolean framed; /* whether there is a demuxer in front of us */
};
struct _GstMadClass
{
GstElementClass parent_class;
};
/* elementfactory information */
static const GstElementDetails gst_mad_details =
GST_ELEMENT_DETAILS ("mad mp3 decoder",
"Codec/Decoder/Audio",
"Uses mad code to decode mp3 streams",
"Wim Taymans <wim@fluendo.com>");
enum
{
ARG_0,
ARG_HALF,
ARG_IGNORE_CRC
};
GST_DEBUG_CATEGORY_STATIC (mad_debug);
#define GST_CAT_DEFAULT mad_debug
static GstStaticPadTemplate mad_src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
"signed = (boolean) true, "
"width = (int) 32, "
"depth = (int) 32, "
"rate = (int) { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 }, "
"channels = (int) [ 1, 2 ]")
);
/* FIXME: make three caps, for mpegversion 1, 2 and 2.5 */
static GstStaticPadTemplate mad_sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/mpeg, "
"mpegversion = (int) 1, "
"layer = (int) [ 1, 3 ], "
"rate = (int) { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 }, "
"channels = (int) [ 1, 2 ]")
);
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 GstQueryType *gst_mad_get_query_types (GstPad * pad);
static gboolean gst_mad_src_query (GstPad * pad, GstQuery * query);
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 gboolean gst_mad_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_mad_chain (GstPad * pad, GstBuffer * buffer);
static GstStateChangeReturn gst_mad_change_state (GstElement * element,
GstStateChange transition);
static void gst_mad_set_index (GstElement * element, GstIndex * index);
static GstIndex *gst_mad_get_index (GstElement * element);
static GstElementClass *parent_class = NULL;
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);
}
GST_DEBUG_CATEGORY_INIT (mad_debug, "mad", 0, "mad mp3 decoding");
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, "Unknown", "unknown"},
{MAD_LAYER_I, "Layer I", "1"},
{MAD_LAYER_II, "Layer II", "2"},
{MAD_LAYER_III, "Layer III", "3"},
{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, "Unknown", "unknown"},
{MAD_MODE_SINGLE_CHANNEL, "Mono", "mono"},
{MAD_MODE_DUAL_CHANNEL, "Dual Channel", "dual"},
{MAD_MODE_JOINT_STEREO, "Joint Stereo", "joint"},
{MAD_MODE_STEREO, "Stereo", "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, "Unknown", "unknown"},
{MAD_EMPHASIS_NONE, "None", "none"},
{MAD_EMPHASIS_50_15_US, "50/15 Microseconds", "50-15"},
{MAD_EMPHASIS_CCITT_J_17, "CCITT J.17", "j-17"},
{MAD_EMPHASIS_RESERVED, "Reserved", "reserved"},
{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_static_pad_template_get (&mad_sink_template_factory));
gst_element_class_add_pad_template (element_class,
gst_static_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_peek_parent (klass);
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",
TRUE, G_PARAM_READWRITE));
/* register tags */
#define GST_TAG_LAYER "layer"
#define GST_TAG_MODE "mode"
#define GST_TAG_EMPHASIS "emphasis"
gst_tag_register (GST_TAG_LAYER, GST_TAG_FLAG_ENCODED, G_TYPE_UINT,
"layer", "MPEG audio layer", NULL);
gst_tag_register (GST_TAG_MODE, GST_TAG_FLAG_ENCODED, G_TYPE_STRING,
"mode", "MPEG audio channel mode", NULL);
gst_tag_register (GST_TAG_EMPHASIS, GST_TAG_FLAG_ENCODED, G_TYPE_STRING,
"emphasis", "MPEG audio emphasis", NULL);
}
static void
gst_mad_init (GstMad * mad)
{
GstPadTemplate *template;
/* create the sink and src pads */
template = gst_static_pad_template_get (&mad_sink_template_factory);
mad->sinkpad = gst_pad_new_from_template (template, "sink");
gst_object_unref (template);
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_event_function (mad->sinkpad,
GST_DEBUG_FUNCPTR (gst_mad_sink_event));
template = gst_static_pad_template_get (&mad_src_template_factory);
mad->srcpad = gst_pad_new_from_template (template, "src");
gst_object_unref (template);
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_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_use_fixed_caps (mad->srcpad);
mad->tempbuffer = g_malloc (MAD_BUFFER_MDLEN * 3);
mad->tempsize = 0;
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 = TRUE;
mad->segment_start = 0;
mad->header.mode = -1;
mad->header.emphasis = -1;
mad->tags = NULL;
mad->half = FALSE;
mad->ignore_crc = TRUE;
mad->check_for_xing = TRUE;
mad->xing_found = FALSE;
}
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);
mad->tempbuffer = NULL;
}
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 gboolean
gst_mad_convert_sink (GstPad * pad, GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstMad *mad;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
/* -1 always maps to -1, and 0 to 0, we don't need any more info for that */
if (src_value == -1 || src_value == 0) {
*dest_value = src_value;
return TRUE;
}
mad = GST_MAD (GST_PAD_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 = gst_util_uint64_scale (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 = gst_util_uint64_scale (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;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
/* -1 always maps to -1, and 0 to 0, we don't need any more info for that */
if (src_value == -1 || src_value == 0) {
*dest_value = src_value;
return TRUE;
}
mad = GST_MAD (GST_PAD_PARENT (pad));
bytes_per_sample = MAD_NCHANNELS (&mad->frame.header) * 4;
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 =
gst_util_uint64_scale_int (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 = gst_util_uint64_scale_int (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 = gst_util_uint64_scale_int (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_POSITION,
GST_QUERY_DURATION,
GST_QUERY_CONVERT,
0
};
return gst_mad_src_query_types;
}
static gboolean
gst_mad_src_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstPad *peer;
GstMad *mad;
mad = GST_MAD (GST_PAD_PARENT (pad));
peer = gst_pad_get_peer (mad->sinkpad);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_FORMATS:
gst_query_set_formats (query, 3, GST_FORMAT_DEFAULT, GST_FORMAT_TIME,
GST_FORMAT_BYTES);
break;
case GST_QUERY_POSITION:
{
GstFormat format;
gint64 cur;
/* save requested format */
gst_query_parse_position (query, &format, NULL);
/* try any demuxer before us first */
if (format == GST_FORMAT_TIME && peer && gst_pad_query (peer, query)) {
gst_query_parse_position (query, NULL, &cur);
GST_LOG_OBJECT (mad, "peer returned position %" GST_TIME_FORMAT,
GST_TIME_ARGS (cur));
break;
}
/* and convert to the requested format */
if (format != GST_FORMAT_DEFAULT) {
if (!gst_mad_convert_src (pad, GST_FORMAT_DEFAULT, mad->total_samples,
&format, &cur))
goto error;
} else {
cur = mad->total_samples;
}
gst_query_set_position (query, format, cur);
if (format == GST_FORMAT_TIME) {
GST_LOG ("position=%" GST_TIME_FORMAT, GST_TIME_ARGS (cur));
} else {
GST_LOG ("position=%" G_GINT64_FORMAT ", format=%u", cur, format);
}
break;
}
case GST_QUERY_DURATION:
{
GstFormat bytes_format = GST_FORMAT_BYTES;
GstFormat time_format = GST_FORMAT_TIME;
GstFormat req_format;
gint64 total, total_bytes;
/* save requested format */
gst_query_parse_duration (query, &req_format, NULL);
if (peer == NULL)
goto error;
/* try any demuxer before us first */
if (req_format == GST_FORMAT_TIME && gst_pad_query (peer, query)) {
gst_query_parse_duration (query, NULL, &total);
GST_LOG_OBJECT (mad, "peer returned duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (total));
break;
}
/* query peer for total length in bytes */
if (!gst_pad_query_peer_duration (mad->sinkpad, &bytes_format,
&total_bytes) || total_bytes <= 0) {
GST_LOG_OBJECT (mad, "duration query on peer pad failed");
goto error;
}
GST_LOG_OBJECT (mad, "peer pad returned total=%" G_GINT64_FORMAT
" bytes", total_bytes);
if (!gst_mad_convert_sink (pad, GST_FORMAT_BYTES, total_bytes,
&time_format, &total)) {
GST_DEBUG_OBJECT (mad, "conversion BYTE => TIME failed");
goto error;
}
if (!gst_mad_convert_src (pad, GST_FORMAT_TIME, total,
&req_format, &total)) {
GST_DEBUG_OBJECT (mad, "conversion TIME => %s failed",
gst_format_get_name (req_format));
goto error;
}
gst_query_set_duration (query, req_format, total);
if (req_format == GST_FORMAT_TIME) {
GST_LOG_OBJECT (mad, "duration=%" GST_TIME_FORMAT,
GST_TIME_ARGS (total));
} else {
GST_LOG_OBJECT (mad, "duration=%" G_GINT64_FORMAT " (%s)",
total, gst_format_get_name (req_format));
}
break;
}
case GST_QUERY_CONVERT:
{
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
if (!(res =
gst_mad_convert_src (pad, src_fmt, src_val, &dest_fmt,
&dest_val)))
goto error;
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
if (peer)
gst_object_unref (peer);
return res;
error:
GST_DEBUG ("error handling query");
if (peer)
gst_object_unref (peer);
return FALSE;
}
static gboolean
index_seek (GstMad * mad, GstPad * pad, GstEvent * event)
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
GstIndexEntry *entry = NULL;
/* 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;
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
entry = gst_index_get_assoc_entry (mad->index, mad->index_id,
GST_INDEX_LOOKUP_BEFORE, 0, format, cur);
GST_DEBUG ("index seek");
if (!entry)
return FALSE;
#if 0
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mad->sinkpad));
#else
peer_formats = try_all_formats; /* FIXME */
#endif
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 (format)->nick,
cur, gst_format_get_details (*try_formats)->nick, value);
seek_event = gst_event_new_seek (rate, *try_formats, flags,
cur_type, value, stop_type, stop);
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 (format == GST_FORMAT_TIME);
mad->segment_start = cur;
return TRUE;
}
}
try_formats++;
}
return FALSE;
}
static gboolean
normal_seek (GstMad * mad, GstPad * pad, GstEvent * event)
{
gdouble rate;
GstFormat format, conv;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 time_cur, time_stop;
gint64 bytes_cur, bytes_stop;
gboolean flush;
/* const GstFormat *peer_formats; */
gboolean res;
GST_DEBUG ("normal seek");
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
if (format != GST_FORMAT_TIME) {
conv = GST_FORMAT_TIME;
if (!gst_mad_convert_src (pad, format, cur, &conv, &time_cur))
goto convert_error;
if (!gst_mad_convert_src (pad, format, stop, &conv, &time_stop))
goto convert_error;
} else {
time_cur = cur;
time_stop = stop;
}
GST_DEBUG ("seek to time %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT,
GST_TIME_ARGS (time_cur), GST_TIME_ARGS (time_stop));
/* shave off the flush flag, we'll need it later */
flush = ((flags & GST_SEEK_FLAG_FLUSH) != 0);
/* assume the worst */
res = FALSE;
conv = GST_FORMAT_BYTES;
if (!gst_mad_convert_sink (pad, GST_FORMAT_TIME, time_cur, &conv, &bytes_cur))
goto convert_error;
if (!gst_mad_convert_sink (pad, GST_FORMAT_TIME, time_stop, &conv,
&bytes_stop))
goto convert_error;
{
GstEvent *seek_event;
/* conversion succeeded, create the seek */
seek_event =
gst_event_new_seek (rate, GST_FORMAT_BYTES, flags, cur_type,
bytes_cur, stop_type, bytes_stop);
/* do the seek */
res = gst_pad_push_event (mad->sinkpad, seek_event);
if (res) {
/* we need to break out of the processing loop on flush */
mad->restart = flush;
mad->segment_start = time_cur;
mad->last_ts = time_cur;
}
}
#if 0
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_EVENT_SEEK_METHOD (event) | 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++;
}
#endif
return res;
/* ERRORS */
convert_error:
{
/* probably unsupported seek format */
GST_DEBUG ("failed to convert format %u into GST_FORMAT_TIME", format);
return FALSE;
}
}
static gboolean
gst_mad_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstMad *mad;
mad = GST_MAD (GST_PAD_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
/* the all-formats seek logic */
case GST_EVENT_SEEK:
gst_event_ref (event);
if (!(res = gst_pad_event_default (pad, event))) {
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 gint32
scale (mad_fixed_t sample)
{
#if MAD_F_FRACBITS < 28
/* round */
sample += (1L << (28 - MAD_F_FRACBITS - 1));
#endif
/* clip */
if (sample >= MAD_F_ONE)
sample = MAD_F_ONE - 1;
else if (sample < -MAD_F_ONE)
sample = -MAD_F_ONE;
#if MAD_F_FRACBITS < 28
/* quantize */
sample >>= (28 - MAD_F_FRACBITS);
#endif
/* convert from 29 bits to 32 bits */
return (gint32) (sample << 3);
}
/* do we need this function? */
static void
gst_mad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMad *mad;
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;
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");
mad->header.bitrate = header->bitrate;
mad->new_header = FALSE;
if (changed) {
GstTagList *list;
GEnumValue *mode;
GEnumValue *emphasis;
mode =
g_enum_get_value (g_type_class_ref (GST_TYPE_MAD_MODE),
mad->header.mode);
emphasis =
g_enum_get_value (g_type_class_ref (GST_TYPE_MAD_EMPHASIS),
mad->header.emphasis);
list = gst_tag_list_new ();
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_LAYER, mad->header.layer,
GST_TAG_MODE, mode->value_nick,
GST_TAG_EMPHASIS, emphasis->value_nick, NULL);
if (!mad->framed) {
gchar *str;
str = g_strdup_printf ("MPEG-1 layer %d", mad->header.layer);
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_AUDIO_CODEC, str, NULL);
g_free (str);
}
if (!mad->xing_found) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_BITRATE, mad->header.bitrate, NULL);
}
gst_element_post_message (GST_ELEMENT (mad),
gst_message_new_tag (GST_OBJECT (mad), list));
}
#undef CHECK_HEADER
}
static gboolean
gst_mad_sink_event (GstPad * pad, GstEvent * event)
{
GstMad *mad = GST_MAD (GST_PAD_PARENT (pad));
gboolean result;
GST_DEBUG ("handling %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:{
GstFormat format;
gst_event_parse_new_segment (event, NULL, NULL, &format, NULL, NULL,
NULL);
if (format == GST_FORMAT_TIME) {
/* FIXME: is this really correct? */
mad->tempsize = 0;
result = gst_pad_push_event (mad->srcpad, event);
/* we don't need to restart when we get here */
mad->restart = FALSE;
mad->framed = TRUE;
} else {
GST_DEBUG ("dropping newsegment event in format %s",
gst_format_get_name (format));
/* on restart the chain function will generate a new
* newsegment event, so we can just drop this one */
mad->restart = TRUE;
gst_event_unref (event);
mad->tempsize = 0;
mad->framed = FALSE;
result = TRUE;
}
break;
}
case GST_EVENT_EOS:
mad->caps_set = FALSE; /* could be a new stream */
result = gst_pad_push_event (mad->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
/* Clear any stored data, as it won't make sense once
* the new data arrives */
mad->tempsize = 0;
mad_frame_mute (&mad->frame);
mad_synth_mute (&mad->synth);
result = gst_pad_event_default (pad, event);
break;
default:
result = gst_pad_event_default (pad, event);
break;
}
return result;
}
static gboolean
gst_mad_check_restart (GstMad * mad)
{
gboolean yes = mad->restart;
if (mad->restart) {
mad->restart = FALSE;
mad->tempsize = 0;
}
return yes;
}
/* The following code has been taken from
* rhythmbox/metadata/monkey-media/stream-info-impl/id3-vfs/mp3bitrate.c
* which took it from xine-lib/src/demuxers/demux_mpgaudio.c
* This code has been kindly relicensed to LGPL by Thibaut Mattern and
* Bastien Nocera
*/
#define BE_32(x) GST_READ_UINT32_BE(x)
#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
( (long)(unsigned char)(ch3) | \
( (long)(unsigned char)(ch2) << 8 ) | \
( (long)(unsigned char)(ch1) << 16 ) | \
( (long)(unsigned char)(ch0) << 24 ) )
/* Xing header stuff */
#define XING_TAG FOURCC_TAG('X', 'i', 'n', 'g')
#define XING_FRAMES_FLAG 0x0001
#define XING_BYTES_FLAG 0x0002
#define XING_TOC_FLAG 0x0004
#define XING_VBR_SCALE_FLAG 0x0008
#define XING_TOC_LENGTH 100
/* check for valid "Xing" VBR header */
static int
is_xhead (unsigned char *buf)
{
return (BE_32 (buf) == XING_TAG);
}
#undef LOG
/*#define LOG*/
#ifdef LOG
#ifndef WIN32
#define lprintf(x...) g_print(x)
#else
#define lprintf GST_DEBUG
#endif
#else
#ifndef WIN32
#define lprintf(x...)
#else
#define lprintf GST_DEBUG
#endif
#endif
static int
mpg123_parse_xing_header (struct mad_header *header,
const guint8 * buf, int bufsize, int *bitrate, int *time)
{
int i;
guint8 *ptr = (guint8 *) buf;
double frame_duration;
int xflags, xframes, xbytes, xvbr_scale;
int abr;
guint8 xtoc[XING_TOC_LENGTH];
int lsf_bit = !(header->flags & MAD_FLAG_LSF_EXT);
xframes = xbytes = 0;
/* offset of the Xing header */
if (lsf_bit) {
if (header->mode != MAD_MODE_SINGLE_CHANNEL)
ptr += (32 + 4);
else
ptr += (17 + 4);
} else {
if (header->mode != MAD_MODE_SINGLE_CHANNEL)
ptr += (17 + 4);
else
ptr += (9 + 4);
}
if (ptr >= (buf + bufsize - 4))
return 0;
if (is_xhead (ptr)) {
lprintf ("Xing header found\n");
ptr += 4;
if (ptr >= (buf + bufsize - 4))
return 0;
xflags = BE_32 (ptr);
ptr += 4;
if (xflags & XING_FRAMES_FLAG) {
if (ptr >= (buf + bufsize - 4))
return 0;
xframes = BE_32 (ptr);
lprintf ("xframes: %d\n", xframes);
ptr += 4;
}
if (xflags & XING_BYTES_FLAG) {
if (ptr >= (buf + bufsize - 4))
return 0;
xbytes = BE_32 (ptr);
lprintf ("xbytes: %d\n", xbytes);
ptr += 4;
}
if (xflags & XING_TOC_FLAG) {
lprintf ("toc found\n");
if (ptr >= (buf + bufsize - XING_TOC_LENGTH))
return 0;
for (i = 0; i < XING_TOC_LENGTH; i++) {
xtoc[i] = *(ptr + i);
lprintf ("%d ", xtoc[i]);
}
lprintf ("\n");
ptr += XING_TOC_LENGTH;
}
xvbr_scale = -1;
if (xflags & XING_VBR_SCALE_FLAG) {
if (ptr >= (buf + bufsize - 4))
return 0;
xvbr_scale = BE_32 (ptr);
lprintf ("xvbr_scale: %d\n", xvbr_scale);
}
/* 1 kbit = 1000 bits ! (and not 1024 bits) */
if (xflags & (XING_FRAMES_FLAG | XING_BYTES_FLAG)) {
if (header->layer == MAD_LAYER_I) {
frame_duration = 384.0 / (double) header->samplerate;
} else {
int slots_per_frame;
slots_per_frame = ((header->layer == MAD_LAYER_III)
&& !lsf_bit) ? 72 : 144;
frame_duration = slots_per_frame * 8.0 / (double) header->samplerate;
}
abr = ((double) xbytes * 8.0) / ((double) xframes * frame_duration);
lprintf ("abr: %d bps\n", abr);
if (bitrate != NULL) {
*bitrate = abr;
}
if (time != NULL) {
*time = (double) xframes *frame_duration;
lprintf ("stream_length: %d s, %d min %d s\n", *time,
*time / 60, *time % 60);
}
} else {
/* it's a stupid Xing header */
lprintf ("not a Xing VBR file\n");
}
return 1;
} else {
lprintf ("Xing header not found\n");
return 0;
}
}
/* End of Xine code */
/* internal function to check if the header has changed and thus the
* caps need to be reset. Only call during normal mode, not resyncing */
static void
gst_mad_check_caps_reset (GstMad * mad)
{
guint nchannels;
guint rate, old_rate = mad->rate;
nchannels = MAD_NCHANNELS (&mad->frame.header);
#if MAD_VERSION_MINOR <= 12
rate = mad->header.sfreq;
#else
rate = mad->frame.header.samplerate;
#endif
/* rate and channels are not supposed to change in a continuous stream,
* so check this first before doing anything */
/* only set caps if they weren't already set for this continuous stream */
if (mad->channels != nchannels || mad->rate != rate) {
if (mad->caps_set) {
GST_DEBUG
("Header changed from %d Hz/%d ch to %d Hz/%d ch, failed sync after seek ?",
mad->rate, mad->channels, rate, nchannels);
/* we're conservative on stream changes. However, our *initial* caps
* might have been wrong as well - mad ain't perfect in syncing. So,
* we count caps changes and change if we pass a limit treshold (3). */
if (nchannels != mad->pending_channels || rate != mad->pending_rate) {
mad->times_pending = 0;
mad->pending_channels = nchannels;
mad->pending_rate = rate;
}
if (++mad->times_pending < 3)
return;
}
}
gst_mad_update_info (mad);
if (mad->channels != nchannels || mad->rate != rate) {
GstCaps *caps;
if (mad->stream.options & MAD_OPTION_HALFSAMPLERATE)
rate >>= 1;
/* FIXME see if peer can accept the caps */
/* we set the caps even when the pad is not connected so they
* can be gotten for streaminfo */
caps = gst_caps_new_simple ("audio/x-raw-int",
"endianness", G_TYPE_INT, G_BYTE_ORDER,
"signed", G_TYPE_BOOLEAN, TRUE,
"width", G_TYPE_INT, 32,
"depth", G_TYPE_INT, 32,
"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, nchannels, NULL);
gst_pad_set_caps (mad->srcpad, caps);
gst_caps_unref (caps);
mad->caps_set = TRUE; /* set back to FALSE on discont */
mad->channels = nchannels;
mad->rate = rate;
/* update sample count so we don't come up with crazy timestamps */
if (mad->total_samples && old_rate) {
mad->total_samples = mad->total_samples * rate / old_rate;
}
}
}
static GstFlowReturn
gst_mad_chain (GstPad * pad, GstBuffer * buffer)
{
GstMad *mad;
guint8 *data;
glong size, tempsize;
gboolean new_pts = FALSE;
GstClockTime timestamp;
GstFlowReturn result = GST_FLOW_OK;
mad = GST_MAD (GST_PAD_PARENT (pad));
/* restarts happen on discontinuities, ie. seek, flush, PAUSED to PLAYING */
if (gst_mad_check_restart (mad)) {
mad->need_newsegment = TRUE;
GST_DEBUG ("mad restarted");
}
timestamp = GST_BUFFER_TIMESTAMP (buffer);
GST_DEBUG ("mad in timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));
/* handle timestamps */
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* if there is nothing left to process in our temporary buffer,
* we can set this timestamp on the next outgoing buffer */
if (mad->tempsize == 0) {
/* we have to save the result here because we can't yet convert
* the timestamp to a sample offset, as 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;
}
}
GST_DEBUG ("last_ts %" GST_TIME_FORMAT, GST_TIME_ARGS (mad->last_ts));
/* handle data */
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
tempsize = mad->tempsize;
/* 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; /* convenience pointer to tempbuffer */
tocopy =
MIN (MAD_BUFFER_MDLEN, MIN (size,
MAD_BUFFER_MDLEN * 3 - mad->tempsize));
if (tocopy == 0) {
GST_ELEMENT_ERROR (mad, STREAM, DECODE, (NULL),
("mad claims to need more data than %u bytes, we don't have that much",
MAD_BUFFER_MDLEN * 3));
result = GST_FLOW_ERROR;
goto end;
}
/* append the chunk to process to our internal temporary buffer */
GST_LOG ("tempbuffer size %ld, copying %d bytes from incoming buffer",
mad->tempsize, tocopy);
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 = 0;
guint nsamples;
guint64 time_offset = GST_CLOCK_TIME_NONE;
guint64 time_duration = GST_CLOCK_TIME_NONE;
unsigned char const *before_sync, *after_sync;
gboolean goto_exit = FALSE;
mad->in_error = FALSE;
mad_stream_buffer (&mad->stream, mad_input_buffer, mad->tempsize);
/* added separate header decoding to catch errors earlier, also fixes
* some weird decoding errors... */
GST_LOG ("decoding the header now");
if (mad_header_decode (&mad->frame.header, &mad->stream) == -1) {
if (mad->stream.error == MAD_ERROR_BUFLEN) {
GST_LOG ("not enough data in tempbuffer (%ld), breaking to get more",
mad->tempsize);
break;
} else {
GST_WARNING ("mad_header_decode had an error: %s",
mad_stream_errorstr (&mad->stream));
}
}
GST_LOG ("decoding one frame now");
if (mad_frame_decode (&mad->frame, &mad->stream) == -1) {
GST_LOG ("got error %d", mad->stream.error);
/* not enough data, need to wait for next buffer? */
if (mad->stream.error == MAD_ERROR_BUFLEN) {
if (mad->stream.next_frame == mad_input_buffer) {
GST_LOG
("not enough data in tempbuffer (%ld), breaking to get more",
mad->tempsize);
break;
} else {
GST_LOG ("sync error, flushing unneeded data");
goto next_no_samples;
}
}
/* we are in an error state */
mad->in_error = TRUE;
GST_WARNING ("mad_frame_decode had an error: %s",
mad_stream_errorstr (&mad->stream));
if (!MAD_RECOVERABLE (mad->stream.error)) {
GST_ELEMENT_ERROR (mad, STREAM, DECODE, (NULL), (NULL));
result = GST_FLOW_ERROR;
goto end;
} else if (mad->stream.error == MAD_ERROR_LOSTSYNC) {
/* lost sync, force a resync */
signed long tagsize;
GST_INFO ("recoverable lost sync error");
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 ("found tag");
gst_element_post_message (GST_ELEMENT (mad),
gst_message_new_tag (GST_OBJECT (mad),
gst_tag_list_copy (list)));
if (mad->tags) {
gst_tag_list_insert (mad->tags, list, GST_TAG_MERGE_PREPEND);
} else {
mad->tags = gst_tag_list_copy (list);
}
gst_pad_push_event (mad->srcpad, gst_event_new_tag (list));
}
}
}
mad_frame_mute (&mad->frame);
mad_synth_mute (&mad->synth);
before_sync = mad->stream.ptr.byte;
if (mad_stream_sync (&mad->stream) != 0)
GST_WARNING ("mad_stream_sync failed");
after_sync = mad->stream.ptr.byte;
/* a succesful resync should make us drop bytes as consumed, so
calculate from the byte pointers before and after resync */
consumed = after_sync - before_sync;
GST_DEBUG ("resynchronization consumes %d bytes", consumed);
GST_DEBUG ("synced to data: 0x%0x 0x%0x", *mad->stream.ptr.byte,
*(mad->stream.ptr.byte + 1));
mad_stream_sync (&mad->stream);
/* recoverable errors pass */
goto next_no_samples;
}
if (mad->check_for_xing) {
int bitrate = 0, time = 0;
GstTagList *list;
int frame_len = mad->stream.next_frame - mad->stream.this_frame;
mad->check_for_xing = FALSE;
/* Assume Xing headers can only be the first frame in a mp3 file */
if (mpg123_parse_xing_header (&mad->frame.header,
mad->stream.this_frame, frame_len, &bitrate, &time)) {
mad->xing_found = TRUE;
list = gst_tag_list_new ();
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_DURATION, (gint64) time * 1000 * 1000 * 1000,
GST_TAG_BITRATE, bitrate, NULL);
gst_element_post_message (GST_ELEMENT (mad),
gst_message_new_tag (GST_OBJECT (mad), gst_tag_list_copy (list)));
gst_pad_push_event (mad->srcpad, gst_event_new_tag (list));
goto next_no_samples;
}
}
/* if we're not resyncing/in error, check if caps need to be set again */
if (!mad->in_error)
gst_mad_check_caps_reset (mad);
nsamples = MAD_NSBSAMPLES (&mad->frame.header) *
(mad->stream.options & MAD_OPTION_HALFSAMPLERATE ? 16 : 32);
if (mad->frame.header.samplerate == 0) {
g_warning
("mad->frame.header.samplerate is 0; timestamps cannot be calculated");
} 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;
gint64 total;
/* Convert incoming timestamp to a number of encoded samples */
gst_pad_query_convert (mad->srcpad, GST_FORMAT_TIME, mad->last_ts,
&format, &total);
GST_DEBUG_OBJECT (mad, "calculated samples offset from ts is %"
G_GUINT64_FORMAT " accumulated samples offset is %"
G_GUINT64_FORMAT, total, mad->total_samples);
/* We are using the incoming timestamps to generate the outgoing ones
* if available. However some muxing formats are not precise enough
* to allow us to generate a perfect stream. When converting the
* timestamp to a number of encoded samples so far we are introducing
* a lot of potential error compared to our accumulated number of
* samples encoded. If the difference between those 2 numbers is
* bigger than half a frame we then use the incoming timestamp
* as a reference, otherwise we continue using our accumulated samples
* counter */
if (ABS (mad->total_samples - total) > nsamples / 2) {
GST_DEBUG_OBJECT (mad, "difference is bigger than half a frame, "
"using calculated samples offset %" G_GUINT64_FORMAT, total);
/* Override our accumulated samples counter */
mad->total_samples = total;
/* We use that timestamp directly */
time_offset = mad->last_ts;
}
mad->last_ts = GST_CLOCK_TIME_NONE;
}
if (!GST_CLOCK_TIME_IS_VALID (time_offset)) {
time_offset = gst_util_uint64_scale_int (mad->total_samples,
GST_SECOND, mad->rate);
}
/* Duration is next timestamp - this one to generate a continuous
* stream */
time_duration =
gst_util_uint64_scale_int (mad->total_samples + nsamples,
GST_SECOND, mad->rate) - time_offset;
}
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 (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 = NULL;
gint32 *outdata;
mad_fixed_t const *left_ch, *right_ch;
if (mad->need_newsegment) {
gint64 start = time_offset;
GST_DEBUG ("Sending NEWSEGMENT event, start=%" GST_TIME_FORMAT,
GST_TIME_ARGS (start));
gst_pad_push_event (mad->srcpad,
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
start, GST_CLOCK_TIME_NONE, start));
mad->need_newsegment = FALSE;
}
/* will attach the caps to the buffer */
result =
gst_pad_alloc_buffer_and_set_caps (mad->srcpad, 0,
nsamples * mad->channels * 4, GST_PAD_CAPS (mad->srcpad),
&outbuffer);
if (result != GST_FLOW_OK) {
/* Head for the exit, dropping samples as we go */
GST_LOG ("Skipping frame synthesis due to pad_alloc return value");
goto_exit = TRUE;
goto skip_frame;
}
mad_synth_frame (&mad->synth, &mad->frame);
left_ch = mad->synth.pcm.samples[0];
right_ch = mad->synth.pcm.samples[1];
outdata = (gint32 *) GST_BUFFER_DATA (outbuffer);
GST_DEBUG ("mad out timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (time_offset));
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 (mad->channels == 1) {
gint count = nsamples;
while (count--) {
*outdata++ = scale (*left_ch++) & 0xffffffff;
}
} else {
gint count = nsamples;
while (count--) {
*outdata++ = scale (*left_ch++) & 0xffffffff;
*outdata++ = scale (*right_ch++) & 0xffffffff;
}
}
result = gst_pad_push (mad->srcpad, outbuffer);
if (result != GST_FLOW_OK) {
/* Head for the exit, dropping samples as we go */
goto_exit = TRUE;
}
}
skip_frame:
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->stream.next_frame - mad_input_buffer >= tempsize)) {
new_pts = FALSE;
mad->last_ts = timestamp;
mad->base_byte_offset = GST_BUFFER_OFFSET (buffer);
mad->bytes_consumed = 0;
}
tempsize = 0;
if (gst_mad_check_restart (mad)) {
goto end;
}
next_no_samples:
/* figure out how many bytes mad consumed */
/* if consumed is already set, it's from the resync higher up, so
we need to use that value instead. Otherwise, recalculate from
mad's consumption */
if (consumed == 0)
consumed = mad->stream.next_frame - mad_input_buffer;
GST_LOG ("mad consumed %d bytes", consumed);
/* move out pointer to where mad want the next data */
mad_input_buffer += consumed;
mad->tempsize -= consumed;
mad->bytes_consumed += consumed;
if (goto_exit == TRUE)
goto end;
}
/* we only get here from breaks, tempsize never actually drops below 0 */
memmove (mad->tempbuffer, mad_input_buffer, mad->tempsize);
}
result = GST_FLOW_OK;
end:
gst_buffer_unref (buffer);
return result;
}
static GstStateChangeReturn
gst_mad_change_state (GstElement * element, GstStateChange transition)
{
GstMad *mad;
GstStateChangeReturn ret;
mad = GST_MAD (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_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->caps_set = FALSE;
mad->times_pending = mad->pending_rate = mad->pending_channels = 0;
mad->vbr_average = 0;
mad->segment_start = 0;
mad->new_header = TRUE;
mad->framed = FALSE;
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_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
mad_synth_finish (&mad->synth);
mad_frame_finish (&mad->frame);
mad_stream_finish (&mad->stream);
mad->restart = TRUE;
mad->check_for_xing = TRUE;
if (mad->tags) {
gst_tag_list_free (mad->tags);
mad->tags = NULL;
}
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
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