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mpegaudioparse: The VBRI header is always at offset 0x20, independent of MPEG version

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Also clean up advancing of the data pointer a bit.

Fixes bug #647659.
This commit is contained in:
Sebastian Dröge 2011-04-13 17:11:26 +02:00
parent 025417f124
commit 4250ff5994
1 changed files with 39 additions and 28 deletions
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67
gst/audioparsers/gstmpegaudioparse.c
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@ -566,11 +566,11 @@ gst_mpeg_audio_parse_handle_first_frame (GstMpegAudioParse * mp3parse,
const guint32 info_id = 0x496e666f; /* 'Info' in hex - found in LAME CBR files */
const guint32 vbri_id = 0x56425249; /* 'VBRI' in hex */
const guint32 lame_id = 0x4c414d45; /* 'LAME' in hex */
gint offset;
gint offset_xing, offset_vbri;
guint64 avail;
gint64 upstream_total_bytes = 0;
GstFormat fmt = GST_FORMAT_BYTES;
guint32 read_id;
guint32 read_id_xing = 0, read_id_vbri = 0;
const guint8 *data;
guint bitrate;
@ -580,26 +580,33 @@ gst_mpeg_audio_parse_handle_first_frame (GstMpegAudioParse * mp3parse,
/* Check first frame for Xing info */
if (mp3parse->version == 1) { /* MPEG-1 file */
if (mp3parse->channels == 1)
offset = 0x11;
offset_xing = 0x11;
else
offset = 0x20;
offset_xing = 0x20;
} else { /* MPEG-2 header */
if (mp3parse->channels == 1)
offset = 0x09;
offset_xing = 0x09;
else
offset = 0x11;
offset_xing = 0x11;
}
/* The VBRI tag is always at offset 0x20 */
offset_vbri = 0x20;
/* Skip the 4 bytes of the MP3 header too */
offset += 4;
offset_xing += 4;
offset_vbri += 4;
/* Check if we have enough data to read the Xing header */
avail = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
if (avail < offset + 8)
return;
/* The header starts at the provided offset */
data += offset;
if (avail >= offset_xing + 4) {
read_id_xing = GST_READ_UINT32_BE (data + offset_xing);
}
if (avail >= offset_vbri + 4) {
read_id_vbri = GST_READ_UINT32_BE (data + offset_vbri);
}
/* obtain real upstream total bytes */
fmt = GST_FORMAT_BYTES;
@ -607,17 +614,20 @@ gst_mpeg_audio_parse_handle_first_frame (GstMpegAudioParse * mp3parse,
(mp3parse)), &fmt, &upstream_total_bytes))
upstream_total_bytes = 0;
read_id = GST_READ_UINT32_BE (data);
if (read_id == xing_id || read_id == info_id) {
if (read_id_xing == xing_id || read_id_xing == info_id) {
guint32 xing_flags;
guint bytes_needed = offset + 8;
guint bytes_needed = offset_xing + 8;
gint64 total_bytes;
GstClockTime total_time;
GST_DEBUG_OBJECT (mp3parse, "Found Xing header marker 0x%x", xing_id);
/* Move data after Xing header */
data += offset_xing + 4;
/* Read 4 base bytes of flags, big-endian */
xing_flags = GST_READ_UINT32_BE (data + 4);
xing_flags = GST_READ_UINT32_BE (data);
data += 4;
if (xing_flags & XING_FRAMES_FLAG)
bytes_needed += 4;
if (xing_flags & XING_BYTES_FLAG)
@ -635,9 +645,6 @@ gst_mpeg_audio_parse_handle_first_frame (GstMpegAudioParse * mp3parse,
GST_DEBUG_OBJECT (mp3parse, "Reading Xing header");
mp3parse->xing_flags = xing_flags;
data = GST_BUFFER_DATA (buf);
data += offset + 8;
if (xing_flags & XING_FRAMES_FLAG) {
mp3parse->xing_frames = GST_READ_UINT32_BE (data);
if (mp3parse->xing_frames == 0) {
@ -776,21 +783,25 @@ gst_mpeg_audio_parse_handle_first_frame (GstMpegAudioParse * mp3parse,
GST_DEBUG_OBJECT (mp3parse, "Encoder delay %u, encoder padding %u",
encoder_delay, encoder_padding);
}
} else if (read_id == vbri_id) {
}
if (read_id_vbri == vbri_id) {
gint64 total_bytes, total_frames;
GstClockTime total_time;
guint16 nseek_points;
GST_DEBUG_OBJECT (mp3parse, "Found VBRI header marker 0x%x", vbri_id);
if (avail < offset + 26) {
if (avail < offset_vbri + 26) {
GST_DEBUG_OBJECT (mp3parse,
"Not enough data to read VBRI header (need %d)", offset + 26);
"Not enough data to read VBRI header (need %d)", offset_vbri + 26);
return;
}
GST_DEBUG_OBJECT (mp3parse, "Reading VBRI header");
data = GST_BUFFER_DATA (buf);
data += offset + 4;
/* Move data after VBRI header */
data += offset_vbri + 4;
if (GST_READ_UINT16_BE (data) != 0x0001) {
GST_WARNING_OBJECT (mp3parse,
@ -850,10 +861,10 @@ gst_mpeg_audio_parse_handle_first_frame (GstMpegAudioParse * mp3parse,
goto out_vbri;
}
if (avail < offset + 26 + nseek_points * seek_bytes) {
if (avail < offset_vbri + 26 + nseek_points * seek_bytes) {
GST_WARNING_OBJECT (mp3parse,
"Not enough data to read VBRI seek table (need %d)",
offset + 26 + nseek_points * seek_bytes);
offset_vbri + 26 + nseek_points * seek_bytes);
goto out_vbri;
}
@ -864,15 +875,15 @@ gst_mpeg_audio_parse_handle_first_frame (GstMpegAudioParse * mp3parse,
goto out_vbri;
}
if (avail < offset + 26) {
if (avail < offset_vbri + 26) {
GST_DEBUG_OBJECT (mp3parse,
"Not enough data to read VBRI header (need %d)",
offset + 26 + nseek_points * seek_bytes);
offset_vbri + 26 + nseek_points * seek_bytes);
return;
}
data = GST_BUFFER_DATA (buf);
data += offset + 26;
data += offset_vbri + 26;
/* VBRI seek table: frame/seek_frames -> byte */
mp3parse->vbri_seek_table = g_new (guint32, nseek_points);