static void
parse_jpeg (const guint8 * data, gsize size)
{
GstJpegSegment segment;
guint offset = 0;
while (gst_jpeg_parse (&segment, data, size, offset)) {
if (segment.offset > offset + 2)
g_print (" skipped %u bytes\n", (guint) segment.offset - offset - 2);
g_print ("%6d bytes at offset %-8u : %s\n", (gint) segment.size,
segment.offset, get_marker_name (segment.marker));
if (segment.marker == GST_JPEG_MARKER_EOI)
break;
if (offset + segment.size < size &&
parse_jpeg_segment (&segment) && segment.size >= 0)
offset = segment.offset + segment.size;
else
offset += 2;
};
}
static GstVaapiDecoderStatus
gst_vaapi_decoder_jpeg_parse (GstVaapiDecoder * base_decoder,
GstAdapter * adapter, gboolean at_eos, GstVaapiDecoderUnit * unit)
{
GstVaapiDecoderJpeg *const decoder =
GST_VAAPI_DECODER_JPEG_CAST (base_decoder);
GstVaapiDecoderJpegPrivate *const priv = &decoder->priv;
GstVaapiParserState *const ps = GST_VAAPI_PARSER_STATE (base_decoder);
GstVaapiDecoderStatus status;
GstJpegMarker marker;
GstJpegSegment seg;
const guchar *buf;
guint buf_size, flags;
gint ofs1, ofs2;
status = ensure_decoder (decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
/* Expect at least 2 bytes for the marker */
buf_size = gst_adapter_available (adapter);
if (buf_size < 2)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
buf = gst_adapter_map (adapter, buf_size);
if (!buf)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
ofs1 = ps->input_offset1 - 2;
if (ofs1 < 0)
ofs1 = 0;
for (;;) {
// Skip any garbage until we reach SOI, if needed
if (!gst_jpeg_parse (&seg, buf, buf_size, ofs1)) {
gst_adapter_unmap (adapter);
ps->input_offset1 = buf_size;
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
ofs1 = seg.offset;
marker = seg.marker;
if (!VALID_STATE (parser, GOT_SOI) && marker != GST_JPEG_MARKER_SOI)
continue;
if (marker == GST_JPEG_MARKER_SOS) {
ofs2 = ps->input_offset2 - 2;
if (ofs2 < ofs1 + seg.size)
ofs2 = ofs1 + seg.size;
// Parse the whole scan + ECSs, including RSTi
for (;;) {
if (!gst_jpeg_parse (&seg, buf, buf_size, ofs2)) {
gst_adapter_unmap (adapter);
ps->input_offset1 = ofs1;
ps->input_offset2 = buf_size;
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
if (is_scan_complete (seg.marker))
break;
ofs2 = seg.offset + seg.size;
}
ofs2 = seg.offset - 2;
} else {
// Check that the whole segment is actually available (in buffer)
ofs2 = ofs1 + seg.size;
if (ofs2 > buf_size) {
gst_adapter_unmap (adapter);
ps->input_offset1 = ofs1;
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
}
break;
}
gst_adapter_unmap (adapter);
unit->size = ofs2 - ofs1;
unit_set_marker_code (unit, marker);
gst_adapter_flush (adapter, ofs1);
ps->input_offset1 = 2;
ps->input_offset2 = 2;
flags = 0;
switch (marker) {
case GST_JPEG_MARKER_SOI:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_START;
priv->parser_state |= GST_JPEG_VIDEO_STATE_GOT_SOI;
break;
case GST_JPEG_MARKER_EOI:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END;
priv->parser_state = 0;
break;
case GST_JPEG_MARKER_SOS:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
priv->parser_state |= GST_JPEG_VIDEO_STATE_GOT_SOS;
break;
case GST_JPEG_MARKER_DAC:
case GST_JPEG_MARKER_DHT:
case GST_JPEG_MARKER_DQT:
if (priv->parser_state & GST_JPEG_VIDEO_STATE_GOT_SOF)
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
break;
case GST_JPEG_MARKER_DRI:
if (priv->parser_state & GST_JPEG_VIDEO_STATE_GOT_SOS)
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
break;
case GST_JPEG_MARKER_DNL:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
break;
case GST_JPEG_MARKER_COM:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
break;
default:
/* SOFn segments */
if (marker >= GST_JPEG_MARKER_SOF_MIN &&
marker <= GST_JPEG_MARKER_SOF_MAX)
priv->parser_state |= GST_JPEG_VIDEO_STATE_GOT_SOF;
/* Application segments */
else if (marker >= GST_JPEG_MARKER_APP_MIN &&
marker <= GST_JPEG_MARKER_APP_MAX)
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
/* Reserved */
else if (marker >= 0x02 && marker <= 0xbf)
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
break;
}
GST_VAAPI_DECODER_UNIT_FLAG_SET (unit, flags);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_buffer(GstVaapiDecoderJpeg *decoder, GstBuffer *buffer)
{
GstVaapiDecoderJpegPrivate * const priv = decoder->priv;
GstVaapiDecoderStatus status = GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
GstJpegMarkerSegment seg;
GstJpegScanSegment scan_seg;
GstClockTime pts;
guchar *buf;
guint buf_size, ofs;
gboolean append_ecs;
buf = GST_BUFFER_DATA(buffer);
buf_size = GST_BUFFER_SIZE(buffer);
if (!buf && buf_size == 0)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
memset(&scan_seg, 0, sizeof(scan_seg));
pts = GST_BUFFER_TIMESTAMP(buffer);
ofs = 0;
while (gst_jpeg_parse(&seg, buf, buf_size, ofs)) {
if (seg.size < 0) {
GST_DEBUG("buffer to short for parsing");
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
ofs += seg.size;
/* Decode scan, if complete */
if (seg.marker == GST_JPEG_MARKER_EOI && scan_seg.header_size > 0) {
scan_seg.data_size = seg.offset - scan_seg.data_offset;
scan_seg.is_valid = TRUE;
}
if (scan_seg.is_valid) {
status = decode_scan(
decoder,
buf + scan_seg.header_offset,
scan_seg.header_size,
buf + scan_seg.data_offset,
scan_seg.data_size
);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
break;
memset(&scan_seg, 0, sizeof(scan_seg));
}
append_ecs = TRUE;
switch (seg.marker) {
case GST_JPEG_MARKER_SOI:
priv->has_quant_table = FALSE;
priv->has_huf_table = FALSE;
priv->mcu_restart = 0;
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
break;
case GST_JPEG_MARKER_EOI:
if (decode_current_picture(decoder)) {
/* Get out of the loop, trailing data is not needed */
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
goto end;
}
status = GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
break;
case GST_JPEG_MARKER_DHT:
status = decode_huffman_table(decoder, buf + seg.offset, seg.size);
break;
case GST_JPEG_MARKER_DQT:
status = decode_quant_table(decoder, buf + seg.offset, seg.size);
break;
case GST_JPEG_MARKER_DRI:
status = decode_restart_interval(decoder, buf + seg.offset, seg.size);
break;
case GST_JPEG_MARKER_DAC:
GST_ERROR("unsupported arithmetic coding mode");
status = GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
break;
case GST_JPEG_MARKER_SOS:
scan_seg.header_offset = seg.offset;
scan_seg.header_size = seg.size;
scan_seg.data_offset = seg.offset + seg.size;
scan_seg.data_size = 0;
append_ecs = FALSE;
break;
default:
/* Restart marker */
if (seg.marker >= GST_JPEG_MARKER_RST_MIN &&
seg.marker <= GST_JPEG_MARKER_RST_MAX) {
append_ecs = FALSE;
break;
}
/* Frame header */
if (seg.marker >= GST_JPEG_MARKER_SOF_MIN &&
seg.marker <= GST_JPEG_MARKER_SOF_MAX) {
status = decode_picture(
decoder,
seg.marker,
buf + seg.offset, seg.size,
pts
);
break;
}
/* Application segments */
if (seg.marker >= GST_JPEG_MARKER_APP_MIN &&
seg.marker <= GST_JPEG_MARKER_APP_MAX) {
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
break;
}
GST_WARNING("unsupported marker (0x%02x)", seg.marker);
status = GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
break;
}
/* Append entropy coded segments */
if (append_ecs)
scan_seg.data_size = seg.offset - scan_seg.data_offset;
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
break;
}
end:
return status;
}
