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midiparse: handle midi in RIFF

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This commit is contained in:
Wim Taymans 2013-03-21 09:30:41 +01:00
parent a093d65310
commit 76cd090503
1 changed files with 95 additions and 6 deletions
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101
gst/midi/midiparse.c
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@ -412,6 +412,85 @@ parse_MTrk (GstMidiParse * midiparse, guint8 * data, guint size)
return TRUE;
}
static gboolean
find_midi_chunk (GstMidiParse * midiparse, guint8 * data, guint size,
guint * offset, guint * length)
{
guint32 type;
if (size < 8)
goto short_chunk;
type = GST_STR_FOURCC (data);
if (type == GST_MAKE_FOURCC ('R', 'I', 'F', 'F')) {
guint32 riff_len;
GST_DEBUG_OBJECT (midiparse, "found RIFF");
if (size < 12)
goto short_chunk;
if (GST_STR_FOURCC (data + 8) != GST_MAKE_FOURCC ('R', 'M', 'I', 'D'))
goto invalid_format;
riff_len = GST_READ_UINT32_LE (data + 4);
if (size < riff_len)
goto short_chunk;
data += 12;
size -= 12;
*offset = 12;
GST_DEBUG_OBJECT (midiparse, "found RIFF RMID of size %u", riff_len);
while (TRUE) {
guint32 chunk_type;
guint32 chunk_len;
if (riff_len < 8)
goto short_chunk;
chunk_type = GST_STR_FOURCC (data);
chunk_len = GST_READ_UINT32_LE (data + 4);
riff_len -= 8;
if (riff_len < chunk_len)
goto short_chunk;
data += 8;
size -= 8;
*offset += 8;
riff_len -= chunk_len;
if (chunk_type == GST_MAKE_FOURCC ('d', 'a', 't', 'a')) {
*length = chunk_len;
break;
}
data += chunk_len;
size -= chunk_len;
}
} else {
*offset = 0;
*length = size;
}
return TRUE;
/* ERRORS */
short_chunk:
{
GST_LOG_OBJECT (midiparse, "not enough data %u < %u", length + 8, size);
return FALSE;
}
invalid_format:
{
GST_ERROR_OBJECT (midiparse, "invalid format");
return FALSE;
}
}
static guint
gst_midi_parse_chunk (GstMidiParse * midiparse, guint8 * data, guint size)
{
@ -443,12 +522,13 @@ gst_midi_parse_chunk (GstMidiParse * midiparse, guint8 * data, guint size)
GST_LOG_OBJECT (midiparse, "ignore chunk");
break;
}
return length + 8;
/* ERRORS */
short_chunk:
{
GST_LOG_OBJECT (midiparse, "not enough data %u < %u", length + 8, size);
GST_LOG_OBJECT (midiparse, "not enough data %u < %u", size, length + 8);
return 0;
}
invalid_format:
@ -463,7 +543,7 @@ gst_midi_parse_parse_song (GstMidiParse * midiparse)
{
GstCaps *outcaps;
guint8 *data;
guint size;
guint size, offset, length;
GST_DEBUG_OBJECT (midiparse, "Parsing song");
@ -472,15 +552,18 @@ gst_midi_parse_parse_song (GstMidiParse * midiparse)
midiparse->tempo = 60;
while (size) {
if (!find_midi_chunk (midiparse, data, size, &offset, &length))
goto invalid_format;
while (length) {
guint consumed;
consumed = gst_midi_parse_chunk (midiparse, data, size);
consumed = gst_midi_parse_chunk (midiparse, &data[offset], length);
if (consumed == 0)
goto short_file;
data += consumed;
size -= consumed;
offset += consumed;
length -= consumed;
}
outcaps = gst_pad_get_pad_template_caps (midiparse->srcpad);
@ -503,6 +586,12 @@ short_file:
g_free (data);
return GST_FLOW_ERROR;
}
invalid_format:
{
GST_ERROR_OBJECT (midiparse, "invalid format");
g_free (data);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn