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opusparse: parse raw opus packets

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This commit is contained in:
Vincent Penquerc'h 2011-11-20 13:07:27 +00:00
parent c0695ba7f2
commit 6c2c0aef53
1 changed files with 46 additions and 19 deletions
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65
ext/opus/gstopusparse.c
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@ -137,36 +137,60 @@ gst_opus_parse_check_valid_frame (GstBaseParse * base,
guint32 packet_size; guint32 packet_size;
int ret = FALSE; int ret = FALSE;
int channels, bandwidth; int channels, bandwidth;
const unsigned char *frames[48];
unsigned char toc;
short frame_sizes[48];
int payload_offset;
int nframes;
int packet_offset = 0;
parse = GST_OPUS_PARSE (base); parse = GST_OPUS_PARSE (base);
data = GST_BUFFER_DATA (frame->buffer); data = GST_BUFFER_DATA (frame->buffer);
size = GST_BUFFER_SIZE (frame->buffer); size = GST_BUFFER_SIZE (frame->buffer);
GST_DEBUG_OBJECT (parse, "Checking for frame, %u bytes in buffer", size); GST_DEBUG_OBJECT (parse, "Checking for frame, %u bytes in buffer", size);
if (size < 4) {
GST_DEBUG_OBJECT (parse, "Too small"); /* First, check if there's an Opus packet there */
goto beach; nframes =
} opus_packet_parse (data, size, &toc, frames, frame_sizes,
packet_size = GST_READ_UINT32_BE (data); &payload_offset);
GST_DEBUG_OBJECT (parse, "Packet size: %u bytes", packet_size); if (nframes < 0) {
if (packet_size > MAX_PAYLOAD_BYTES) { /* Then, check for the test vector framing */
GST_DEBUG_OBJECT (parse, "Too large"); GST_DEBUG_OBJECT (parse,
goto beach; "No Opus packet found, trying test vector framing");
} if (size < 4) {
if (packet_size > size - 4) { GST_DEBUG_OBJECT (parse, "Too small");
GST_DEBUG_OBJECT (parse, "Truncated"); goto beach;
goto beach; }
packet_size = GST_READ_UINT32_BE (data);
GST_DEBUG_OBJECT (parse, "Packet size: %u bytes", packet_size);
if (packet_size > MAX_PAYLOAD_BYTES) {
GST_DEBUG_OBJECT (parse, "Too large");
goto beach;
}
if (packet_size > size - 4) {
GST_DEBUG_OBJECT (parse, "Truncated");
goto beach;
}
nframes =
opus_packet_parse (data + 8, packet_size, &toc, frames, frame_sizes,
&payload_offset);
if (nframes < 0) {
GST_DEBUG_OBJECT (parse, "No test vector framing either");
goto beach;
}
packet_offset = 8;
data += packet_offset;
} }
channels = opus_packet_get_nb_channels (data + 8); channels = opus_packet_get_nb_channels (data);
bandwidth = opus_packet_get_bandwidth (data + 8); bandwidth = opus_packet_get_bandwidth (data);
if (channels < 0 || bandwidth < 0) { if (channels < 0 || bandwidth < 0) {
GST_DEBUG_OBJECT (parse, "It looked like a packet, but it is not"); GST_DEBUG_OBJECT (parse, "It looked like a packet, but it is not");
goto beach; goto beach;
} }
GST_DEBUG_OBJECT (parse, "Got Opus packet, %d bytes");
if (!parse->header_sent) { if (!parse->header_sent) {
GstCaps *caps; GstCaps *caps;
@ -180,8 +204,11 @@ gst_opus_parse_check_valid_frame (GstBaseParse * base,
parse->header_sent = TRUE; parse->header_sent = TRUE;
} }
*skip = 8; *skip = packet_offset;
*frame_size = packet_size; *frame_size = payload_offset;
GST_DEBUG_OBJECT (parse, "Got Opus packet at offset %d, %d bytes", *skip,
*frame_size);
ret = TRUE; ret = TRUE;
beach: beach: