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gst/xingheader/gstxingmux.c: The size of the Xing header is actually 417 as it's rounded to the next smaller integer....

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Original commit message from CVS:
Patch by: Gautier Portet <kassoulet at gmail dot com>
* gst/xingheader/gstxingmux.c:
The size of the Xing header is actually 417 as it's rounded to the
next smaller integer. Fixes #397759.
* gst/xingheader/gstxingmux.c: (xing_generate_header),
(xing_push_header):
Some random cleanup, add FIXMEs and TODOs and check if the newsegment
event to the beginning was successful before pushing the header again.
This commit is contained in:
Gautier Portet 2007-10-05 08:51:44 +00:00 committed by Sebastian Dröge
parent 6350482df8
commit 69c24a99e4
2 changed files with 32 additions and 7 deletions
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13
ChangeLog
View file

@ -1,3 +1,16 @@
2007-10-05 Sebastian Dröge <slomo@circular-chaos.org>
Patch by: Gautier Portet <kassoulet at gmail dot com>
* gst/xingheader/gstxingmux.c:
The size of the Xing header is actually 417 as it's rounded to the
next smaller integer. Fixes #397759.
* gst/xingheader/gstxingmux.c: (xing_generate_header),
(xing_push_header):
Some random cleanup, add FIXMEs and TODOs and check if the newsegment
event to the beginning was successful before pushing the header again.
2007-10-05 Sebastian Dröge <slomo@circular-chaos.org>
Patch by: Wai-Ming Ho <webregbox at yahoo dot co dot uk>

26
gst/xingheader/gstxingmux.c
View file

@ -33,7 +33,7 @@ GST_BOILERPLATE (GstXingMux, gst_xing_mux, GstElement, GST_TYPE_ELEMENT);
/* Xing Header stuff */
struct _GstXingMuxPriv
{
guint64 duration;
GstClockTime duration;
guint64 byte_count;
GList *seek_table;
gboolean flush;
@ -44,7 +44,7 @@ struct _GstXingMuxPriv
#define GST_XING_TOC_FIELD (1 << 2)
#define GST_XING_QUALITY_FIELD (1 << 3)
static const int XING_FRAME_SIZE = 418;
static const int XING_FRAME_SIZE = 417;
static GstStateChangeReturn
gst_xing_mux_change_state (GstElement * element, GstStateChange transition);
@ -186,7 +186,8 @@ xing_generate_header (GstXingMux * xing)
* (00b == no emphasis)
*
* Such a frame (MPEG1 Layer III) contains 1152 samples, its size is thus:
* (1152*(128000/8))/44100 = 417.96
* (1152*(128000/8))/44100 = 417.96 rounded to the next smaller integer, i.e.
* 417.
*
* There are also 32 bytes (ie 8 32 bits values) to skip after the header
* for such frames
@ -203,14 +204,19 @@ xing_generate_header (GstXingMux * xing)
xing_flags = 0;
if (xing->priv->duration != GST_CLOCK_TIME_NONE) {
guint number_of_frames;
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,
* ie 1152 and 44100 in our case.
*/
number_of_frames = (44100 * xing->priv->duration / GST_SECOND) / 1152;
/* FIXME: Better count the actual number of frames as the calculation
* below introduces rounding errors
*/
number_of_frames = gst_util_uint64_scale (xing->priv->duration, 44100,
GST_SECOND) / 1152;
data[SIDE_INFO_SIZE + 3] = GUINT32_TO_BE (number_of_frames);
xing_flags |= GST_XING_FRAME_FIELD;
@ -221,7 +227,7 @@ xing_generate_header (GstXingMux * xing)
data[SIDE_INFO_SIZE + 4] = GUINT32_TO_BE (xing->priv->byte_count);
}
/* Un-#ifdef when it's implemented :) xing code in VbrTag.c looks like
/* TODO: Un-#ifdef when it's implemented :) xing code in VbrTag.c looks like
* it could be stolen
*/
#if 0
@ -256,10 +262,16 @@ xing_push_header (GstXingMux * xing)
GstBuffer *header;
GstEvent *event;
/* FIXME: should actually be after any ID3v2/APE tags and before the real
* MP3 frames.
*/
event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES,
0, GST_CLOCK_TIME_NONE, 0);
gst_pad_push_event (xing->srcpad, event);
if (G_UNLIKELY (!gst_pad_push_event (xing->srcpad, event))) {
GST_WARNING ("Failed to seek to position 0 for pushing the Xing header");
return;
}
header = xing_generate_header (xing);
xing_set_flush (xing, FALSE);