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ext/mad/: parse Xing header in vbr files, and report the parsed length as a GST_TAG_DURATION tag.

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Original commit message from CVS:
2004-03-06  Christophe Fergeau  <teuf@gnome.org>

* ext/mad/gstid3tag.c: (gst_mad_id3_to_tag_list):
* ext/mad/gstmad.c: (gst_mad_init), (is_xhead),
(mpg123_parse_xing_header), (gst_mad_chain): parse Xing header in vbr
files, and report the parsed length as a GST_TAG_DURATION tag.
* gst/tags/gstid3tag.c: support TLEN (duration) tag
This commit is contained in:
Christophe Fergeau 2004-03-05 23:32:36 +00:00
parent da22d695a7
commit 9daabec27d
3 changed files with 199 additions and 5 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2004-03-06 Christophe Fergeau <teuf@gnome.org>
* ext/mad/gstid3tag.c: (gst_mad_id3_to_tag_list):
* ext/mad/gstmad.c: (gst_mad_init), (is_xhead),
(mpg123_parse_xing_header), (gst_mad_chain): parse Xing header in vbr
files, and report the parsed length as a GST_TAG_DURATION tag.
* gst/tags/gstid3tag.c: support TLEN (duration) tag
2004-03-05 Benjamin Otte <otte@gnome.org>
* gst/audioconvert/gstaudioconvert.c: (gst_audio_convert_channels):

15
ext/mad/gstid3tag.c
View file

@ -518,7 +518,20 @@ gst_mad_id3_to_tag_list(const struct id3_tag *tag)
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND, tag_name, tmp, NULL);
break;
}
default:
case G_TYPE_UINT64:
{
guint64 tmp;
g_assert ((strcmp(tag_name,GST_TAG_DURATION) == 0));
tmp = strtoul (utf8, NULL, 10);
if (tmp == 0) {
break;
}
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_DURATION, tmp*1000*1000,
NULL);
break;
}
default:
g_assert (gst_tag_get_type (tag_name) == G_TYPE_STRING);
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND, tag_name, utf8, NULL);
break;

181
ext/mad/gstmad.c
View file

@ -77,6 +77,8 @@ struct _GstMad {
GstIndex *index;
gint index_id;
gboolean check_for_xing;
};
struct _GstMadClass {
@ -329,7 +331,7 @@ gst_mad_init (GstMad *mad)
mad->half = FALSE;
mad->ignore_crc = FALSE;
mad->check_for_xing = TRUE;
GST_FLAG_SET (mad, GST_ELEMENT_EVENT_AWARE);
}
@ -910,6 +912,153 @@ gst_mad_check_restart (GstMad *mad)
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 GINT_FROM_BE
#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
#define lprintf(x...) g_print(x)
#else
#define lprintf(x...)
#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[100];
/* This should be the MPEG Audio version ID
* (version 2.5, 2 or 1) least significant byte, but mad doesn't
* provide that, so assume it's always MPEG 1
*/
int lsf_bit = 1;
xframes = xbytes = 0;
/* offset of the Xing header */
if ( lsf_bit )
{
if( header->mode != MAD_MODE_STEREO )
ptr += (32 + 4);
else
ptr += (17 + 4);
} else {
if( header->mode != MAD_MODE_STEREO )
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 */
static void
gst_mad_chain (GstPad *pad, GstData *_data)
{
@ -956,6 +1105,7 @@ gst_mad_chain (GstPad *pad, GstData *_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)
@ -1038,6 +1188,7 @@ gst_mad_chain (GstPad *pad, GstData *_data)
}
}
}
mad_frame_mute (&mad->frame);
mad_synth_mute (&mad->synth);
mad_stream_sync (&mad->stream);
@ -1045,6 +1196,30 @@ gst_mad_chain (GstPad *pad, GstData *_data)
goto next;
}
if (mad->check_for_xing) {
int bitrate, time;
GstTagList *list;
int frame_len = mad->stream.next_frame - mad->stream.this_frame;
/* 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)) {
list = gst_tag_list_new ();
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
GST_TAG_DURATION, (gint64)time*1000*1000*1000,
NULL);
gst_element_found_tags (GST_ELEMENT (mad), 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->check_for_xing = FALSE;
goto next;
}
nchannels = MAD_NCHANNELS (&mad->frame.header);
nsamples = MAD_NSBSAMPLES (&mad->frame.header) *
(mad->stream.options & MAD_OPTION_HALFSAMPLERATE ? 16 : 32);
@ -1130,8 +1305,7 @@ gst_mad_chain (GstPad *pad, GstData *_data)
while (count--) {
*outdata++ = scale(*left_ch++) & 0xffff;
}
}
else {
} else {
gint count = nsamples;
while (count--) {
*outdata++ = scale(*left_ch++) & 0xffff;
@ -1160,7 +1334,6 @@ gst_mad_chain (GstPad *pad, GstData *_data)
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;