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gstreamer/gst/xingmux/gstxingmux.c

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/*
* Copyright (c) 2006 Christophe Fergeau <teuf@gnome.org>
* Copyright (c) 2008 Sebastian Dröge <slomo@circular-chaos.org>
*
* 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.
*/
/* Xing SDK: http://www.mp3-tech.org/programmer/sources/vbrheadersdk.zip */
/**
* SECTION:element-xingmux
*
* xingmux adds a Xing header to MP3 files. This contains information about the duration and size
* of the file and a seek table and is very useful for getting an almost correct duration and better
* seeking on VBR MP3 files.
*
* This element will remove any existing Xing, LAME or VBRI headers from the beginning of the file.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 audiotestsrc num-buffers=1000 ! audioconvert ! lamemp3enc ! xingmux ! filesink location=test.mp3
* gst-launch-1.0 filesrc location=test.mp3 ! xingmux ! filesink location=test2.mp3
* gst-launch-1.0 filesrc location=test.mp3 ! mp3parse ! xingmux ! filesink location=test2.mp3
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include "gstxingmux.h"
GST_DEBUG_CATEGORY_STATIC (xing_mux_debug);
#define GST_CAT_DEFAULT xing_mux_debug
#define gst_xing_mux_parent_class parent_class
G_DEFINE_TYPE (GstXingMux, gst_xing_mux, GST_TYPE_ELEMENT);
/* Xing Header stuff */
#define GST_XING_FRAME_FIELD (1 << 0)
#define GST_XING_BYTES_FIELD (1 << 1)
#define GST_XING_TOC_FIELD (1 << 2)
#define GST_XING_QUALITY_FIELD (1 << 3)
typedef struct _GstXingSeekEntry
{
gint64 timestamp;
gint byte;
} GstXingSeekEntry;
static inline GstXingSeekEntry *
gst_xing_seek_entry_new (void)
{
return g_slice_new (GstXingSeekEntry);
}
static inline void
gst_xing_seek_entry_free (GstXingSeekEntry * entry)
{
g_slice_free (GstXingSeekEntry, entry);
}
static void gst_xing_mux_finalize (GObject * obj);
static GstStateChangeReturn
gst_xing_mux_change_state (GstElement * element, GstStateChange transition);
static GstFlowReturn gst_xing_mux_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static gboolean gst_xing_mux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstStaticPadTemplate gst_xing_mux_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/mpeg, "
"mpegversion = (int) 1, " "layer = (int) [ 1, 3 ]"));
static GstStaticPadTemplate gst_xing_mux_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/mpeg, "
"mpegversion = (int) 1, " "layer = (int) [ 1, 3 ]"));
static const guint mp3types_bitrates[2][3][16] = {
{
{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448,},
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384,},
{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320,}
},
{
{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256,},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,}
},
};
static const guint mp3types_freqs[3][3] = { {44100, 48000, 32000},
{22050, 24000, 16000},
{11025, 12000, 8000}
};
static gboolean
parse_header (guint32 header, guint * ret_size, guint * ret_spf,
gulong * ret_rate)
{
guint length, spf;
gulong samplerate, bitrate, layer, padding;
gint lsf, mpg25;
if ((header & 0xffe00000) != 0xffe00000) {
g_warning ("invalid sync");
return FALSE;
}
if (((header >> 19) & 3) == 0x01) {
g_warning ("invalid MPEG version");
return FALSE;
}
if (((header >> 17) & 3) == 0x00) {
g_warning ("invalid MPEG layer");
return FALSE;
}
if (((header >> 12) & 0xf) == 0xf || ((header >> 12) & 0xf) == 0x0) {
g_warning ("invalid bitrate");
return FALSE;
}
if (((header >> 10) & 0x3) == 0x3) {
g_warning ("invalid sampling rate");
return FALSE;
}
if (header & 0x00000002) {
g_warning ("invalid emphasis");
return FALSE;
}
if (header & (1 << 20)) {
lsf = (header & (1 << 19)) ? 0 : 1;
mpg25 = 0;
} else {
lsf = 1;
mpg25 = 1;
}
layer = 4 - ((header >> 17) & 0x3);
bitrate = (header >> 12) & 0xF;
bitrate = mp3types_bitrates[lsf][layer - 1][bitrate] * 1000;
if (bitrate == 0)
return FALSE;
samplerate = (header >> 10) & 0x3;
samplerate = mp3types_freqs[lsf + mpg25][samplerate];
padding = (header >> 9) & 0x1;
switch (layer) {
case 1:
length = 4 * ((bitrate * 12) / samplerate + padding);
break;
case 2:
length = (bitrate * 144) / samplerate + padding;
break;
default:
case 3:
length = (bitrate * 144) / (samplerate << lsf) + padding;
break;
}
if (layer == 1)
spf = 384;
else if (layer == 2 || lsf == 0)
spf = 1152;
else
spf = 576;
if (ret_size)
*ret_size = length;
if (ret_spf)
*ret_spf = spf;
if (ret_rate)
*ret_rate = samplerate;
return TRUE;
}
static guint
get_xing_offset (guint32 header)
{
guint mpeg_version = (header >> 19) & 0x3;
guint channel_mode = (header >> 6) & 0x3;
if (mpeg_version == 0x3) {
if (channel_mode == 0x3) {
return 0x11;
} else {
return 0x20;
}
} else {
if (channel_mode == 0x3) {
return 0x09;
} else {
return 0x11;
}
}
}
static gboolean
has_xing_header (guint32 header, GstBuffer * buffer, gsize size)
{
gboolean ret;
GstMapInfo map;
guint8 *data;
gst_buffer_map (buffer, &map, GST_MAP_READ);
data = map.data;
data += 4;
data += get_xing_offset (header);
if (memcmp (data, "Xing", 4) == 0 ||
memcmp (data, "Info", 4) == 0 || memcmp (data, "VBRI", 4) == 0)
ret = TRUE;
else
ret = FALSE;
gst_buffer_unmap (buffer, &map);
return ret;
}
static GstBuffer *
generate_xing_header (GstXingMux * xing)
{
guint8 *xing_flags;
guint32 xing_flags_tmp = 0;
GstBuffer *xing_header;
GstMapInfo map;
guchar *data;
guint32 header;
guint32 header_be;
guint size, spf, xing_offset;
gulong rate;
guint bitrate = 0x00;
gint64 duration;
gint64 byte_count;
header = xing->first_header;
/* Set bitrate and choose lowest possible size */
do {
bitrate++;
header &= 0xffff0fff;
header |= bitrate << 12;
if (!parse_header (header, &size, &spf, &rate)) {
GST_ERROR ("Failed to parse header!");
return NULL;
}
xing_offset = get_xing_offset (header);
} while (size < (4 + xing_offset + 4 + 4 + 4 + 4 + 100) && bitrate < 0xe);
if (bitrate == 0xe) {
GST_ERROR ("No usable bitrate found!");
return NULL;
}
xing_header = gst_buffer_new_and_alloc (size);
gst_buffer_map (xing_header, &map, GST_MAP_WRITE);
data = map.data;
memset (data, 0, size);
header_be = GUINT32_TO_BE (header);
memcpy (data, &header_be, 4);
data += 4;
data += xing_offset;
memcpy (data, "Xing", 4);
data += 4;
xing_flags = data;
data += 4;
if (xing->duration != GST_CLOCK_TIME_NONE) {
duration = xing->duration;
} else {
GstFormat fmt = GST_FORMAT_TIME;
if (!gst_pad_peer_query_duration (xing->sinkpad, fmt, &duration))
duration = GST_CLOCK_TIME_NONE;
}
if (duration != GST_CLOCK_TIME_NONE) {
guint32 number_of_frames;
/* The Xing Header contains a NumberOfFrames field, which verifies to:
* Duration = NumberOfFrames *SamplesPerFrame/SamplingRate
* SamplesPerFrame and SamplingRate are values for the current frame.
*/
number_of_frames = gst_util_uint64_scale (duration, rate, GST_SECOND) / spf;
number_of_frames += 1; /* Xing Header Frame */
GST_DEBUG ("Setting number of frames to %u", number_of_frames);
number_of_frames = GUINT32_TO_BE (number_of_frames);
memcpy (data, &number_of_frames, 4);
xing_flags_tmp |= GST_XING_FRAME_FIELD;
data += 4;
}
if (xing->byte_count != 0) {
byte_count = xing->byte_count;
} else {
GstFormat fmt = GST_FORMAT_BYTES;
if (!gst_pad_peer_query_duration (xing->sinkpad, fmt, &byte_count))
byte_count = 0;
if (byte_count == -1)
byte_count = 0;
}
if (byte_count != 0) {
guint32 nbytes;
if (byte_count > G_MAXUINT32) {
GST_DEBUG ("Too large stream: %" G_GINT64_FORMAT " > %u bytes",
byte_count, G_MAXUINT32);
} else {
nbytes = byte_count;
GST_DEBUG ("Setting number of bytes to %u", nbytes);
nbytes = GUINT32_TO_BE (nbytes);
memcpy (data, &nbytes, 4);
xing_flags_tmp |= GST_XING_BYTES_FIELD;
data += 4;
}
}
if (xing->seek_table != NULL && byte_count != 0
&& duration != GST_CLOCK_TIME_NONE) {
GList *it;
gint percent = 0;
xing_flags_tmp |= GST_XING_TOC_FIELD;
GST_DEBUG ("Writing seek table");
for (it = xing->seek_table; it != NULL && percent < 100; it = it->next) {
GstXingSeekEntry *entry = (GstXingSeekEntry *) it->data;
gint64 pos;
guchar byte;
while ((entry->timestamp * 100) / duration >= percent) {
pos = (entry->byte * 256) / byte_count;
GST_DEBUG (" %d %% -- %" G_GINT64_FORMAT " 1/256", percent, pos);
byte = (guchar) pos;
memcpy (data, &byte, 1);
data++;
percent++;
}
}
if (percent < 100) {
guchar b;
gint i;
memcpy (&b, data - 1, 1);
for (i = percent; i < 100; i++) {
GST_DEBUG (" %d %% -- %d 1/256", i, b);
memcpy (data, &b, 1);
data++;
}
}
}
GST_DEBUG ("Setting Xing flags to 0x%x\n", xing_flags_tmp);
xing_flags_tmp = GUINT32_TO_BE (xing_flags_tmp);
memcpy (xing_flags, &xing_flags_tmp, 4);
gst_buffer_unmap (xing_header, &map);
return xing_header;
}
static void
gst_xing_mux_class_init (GstXingMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_xing_mux_finalize);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_xing_mux_change_state);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_xing_mux_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_xing_mux_sink_template));
GST_DEBUG_CATEGORY_INIT (xing_mux_debug, "xingmux", 0, "Xing Header Muxer");
gst_element_class_set_static_metadata (gstelement_class, "MP3 Xing muxer",
"Formatter/Muxer/Metadata",
"Adds a Xing header to the beginning of a VBR MP3 file",
"Christophe Fergeau <teuf@gnome.org>");
}
static void
gst_xing_mux_finalize (GObject * obj)
{
GstXingMux *xing = GST_XING_MUX (obj);
if (xing->adapter) {
g_object_unref (xing->adapter);
xing->adapter = NULL;
}
if (xing->seek_table) {
g_list_foreach (xing->seek_table, (GFunc) gst_xing_seek_entry_free, NULL);
g_list_free (xing->seek_table);
xing->seek_table = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
xing_reset (GstXingMux * xing)
{
xing->duration = GST_CLOCK_TIME_NONE;
xing->byte_count = 0;
gst_adapter_clear (xing->adapter);
if (xing->seek_table) {
g_list_foreach (xing->seek_table, (GFunc) gst_xing_seek_entry_free, NULL);
g_list_free (xing->seek_table);
xing->seek_table = NULL;
}
xing->sent_xing = FALSE;
}
static void
gst_xing_mux_init (GstXingMux * xing)
{
/* pad through which data comes in to the element */
xing->sinkpad =
gst_pad_new_from_static_template (&gst_xing_mux_sink_template, "sink");
gst_pad_set_chain_function (xing->sinkpad,
GST_DEBUG_FUNCPTR (gst_xing_mux_chain));
gst_pad_set_event_function (xing->sinkpad,
GST_DEBUG_FUNCPTR (gst_xing_mux_sink_event));
GST_PAD_SET_PROXY_CAPS (xing->sinkpad);
gst_element_add_pad (GST_ELEMENT (xing), xing->sinkpad);
/* pad through which data goes out of the element */
xing->srcpad =
gst_pad_new_from_static_template (&gst_xing_mux_src_template, "src");
gst_element_add_pad (GST_ELEMENT (xing), xing->srcpad);
xing->adapter = gst_adapter_new ();
xing_reset (xing);
}
static GstFlowReturn
gst_xing_mux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstXingMux *xing = GST_XING_MUX (parent);
GstFlowReturn ret = GST_FLOW_OK;
gst_adapter_push (xing->adapter, buffer);
while (gst_adapter_available (xing->adapter) >= 4) {
const guchar *data;
guint32 header;
GstBuffer *outbuf;
GstClockTime duration;
guint size, spf;
gulong rate;
GstXingSeekEntry *seek_entry;
data = gst_adapter_map (xing->adapter, 4);
header = GST_READ_UINT32_BE (data);
gst_adapter_unmap (xing->adapter);
if (!parse_header (header, &size, &spf, &rate)) {
GST_DEBUG ("Lost sync, resyncing");
gst_adapter_flush (xing->adapter, 1);
continue;
}
if (gst_adapter_available (xing->adapter) < size)
break;
outbuf = gst_adapter_take_buffer (xing->adapter, size);
if (!xing->sent_xing) {
if (has_xing_header (header, outbuf, size)) {
GST_LOG_OBJECT (xing, "Dropping old Xing header");
gst_buffer_unref (outbuf);
continue;
} else {
GstBuffer *xing_header;
guint64 xing_header_size;
xing->first_header = header;
xing_header = generate_xing_header (xing);
if (xing_header == NULL) {
GST_ERROR ("Can't generate Xing header");
gst_buffer_unref (outbuf);
return GST_FLOW_ERROR;
}
xing_header_size = gst_buffer_get_size (xing_header);
if ((ret = gst_pad_push (xing->srcpad, xing_header)) != GST_FLOW_OK) {
GST_ERROR_OBJECT (xing, "Failed to push Xing header: %s",
gst_flow_get_name (ret));
gst_buffer_unref (xing_header);
gst_buffer_unref (outbuf);
return ret;
}
xing->byte_count += xing_header_size;
xing->sent_xing = TRUE;
}
}
seek_entry = gst_xing_seek_entry_new ();
seek_entry->timestamp =
(xing->duration == GST_CLOCK_TIME_NONE) ? 0 : xing->duration;
/* Workaround for parsers checking that the first seek table entry is 0 */
seek_entry->byte = (seek_entry->timestamp == 0) ? 0 : xing->byte_count;
xing->seek_table = g_list_append (xing->seek_table, seek_entry);
duration = gst_util_uint64_scale_ceil (spf, GST_SECOND, rate);
GST_BUFFER_TIMESTAMP (outbuf) =
(xing->duration == GST_CLOCK_TIME_NONE) ? 0 : xing->duration;
GST_BUFFER_DURATION (outbuf) = duration;
GST_BUFFER_OFFSET (outbuf) = xing->byte_count;
xing->byte_count += gst_buffer_get_size (outbuf);
GST_BUFFER_OFFSET_END (outbuf) = xing->byte_count;
if (xing->duration == GST_CLOCK_TIME_NONE)
xing->duration = duration;
else
xing->duration += duration;
if ((ret = gst_pad_push (xing->srcpad, outbuf)) != GST_FLOW_OK) {
GST_ERROR_OBJECT (xing, "Failed to push MP3 frame: %s",
gst_flow_get_name (ret));
return ret;
}
}
return ret;
}
static gboolean
gst_xing_mux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstXingMux *xing;
gboolean result;
xing = GST_XING_MUX (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
if (xing->sent_xing) {
GST_ERROR ("Already sent Xing header, dropping NEWSEGMENT event!");
gst_event_unref (event);
result = FALSE;
} else {
GstSegment segment;
gst_event_copy_segment (event, &segment);
if (segment.format == GST_FORMAT_BYTES) {
result = gst_pad_push_event (xing->srcpad, event);
} else {
gst_event_unref (event);
gst_segment_init (&segment, GST_FORMAT_BYTES);
event = gst_event_new_segment (&segment);
result = gst_pad_push_event (xing->srcpad, event);
}
}
break;
case GST_EVENT_EOS:{
GstEvent *n_event;
GST_DEBUG_OBJECT (xing, "handling EOS event");
if (xing->sent_xing) {
GstSegment segment;
gst_segment_init (&segment, GST_FORMAT_BYTES);
n_event = gst_event_new_segment (&segment);
if (G_UNLIKELY (!gst_pad_push_event (xing->srcpad, n_event))) {
GST_WARNING
("Failed to seek to position 0 for pushing the Xing header");
} else {
GstBuffer *header;
GstFlowReturn ret;
header = generate_xing_header (xing);
if (header == NULL) {
GST_ERROR ("Can't generate Xing header");
} else {
GST_INFO ("Writing real Xing header to beginning of stream");
if ((ret = gst_pad_push (xing->srcpad, header)) != GST_FLOW_OK)
GST_WARNING ("Failed to push updated Xing header: %s\n",
gst_flow_get_name (ret));
}
}
}
result = gst_pad_push_event (xing->srcpad, event);
break;
}
default:
result = gst_pad_event_default (pad, parent, event);
break;
}
return result;
}
static GstStateChangeReturn
gst_xing_mux_change_state (GstElement * element, GstStateChange transition)
{
GstXingMux *xing;
GstStateChangeReturn result;
xing = GST_XING_MUX (element);
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
xing_reset (xing);
break;
default:
break;
}
return result;
}
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