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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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video-anc: Add support for parsing composite ADF and check the packets' checksum
And add the checksum to the data we test in the unit test.
This commit is contained in:
Sebastian Dröge
Nicolas Dufresne
parent
ca702a9190
commit
932e9f5eee
2 changed files with 123 additions and 38 deletions
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@ -84,40 +84,60 @@ gst_video_vbi_parser_copy (const GstVideoVBIParser * parser)
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return res;
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}
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/* Smallest ANC size (which would have a size Data Count of 0 though) */
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#define SMALLEST_ANC_SIZE 7
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/* See SMPTE S291 */
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static GstVideoVBIParserResult
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get_ancillary_16 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
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{
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gboolean found = FALSE;
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guint16 *data = (guint16 *) parser->work_data;
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const guint16 *data = (const guint16 *) parser->work_data;
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g_return_val_if_fail (parser != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
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g_return_val_if_fail (anc != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
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while (parser->offset + SMALLEST_ANC_SIZE < parser->work_data_size) {
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/* 3 words are needed at least to detect what kind of packet we look at
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*
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* - ADF (SMPTE S291 3.2.1) in case of component ancillary format:
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* 0x000 0x3ff 0x3ff (followed by DID, SDID)
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* - ADF (SMPTE S291 3.2.2) in case of composite ancillary format:
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* 0x3fc DID SDID
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*/
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while (parser->offset + 3 < parser->work_data_size) {
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guint8 DID, SDID, DC;
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guint i;
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guint i = 0, j;
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guint checksum = 0;
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gboolean composite;
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/* Look for ADF
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* FIXME : This assumes 10bit data with parity ! */
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if (data[parser->offset] != 0x000 ||
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data[parser->offset + 1] != 0x3ff ||
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data[parser->offset + 2] != 0x3ff) {
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/* Look for ADF */
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if (data[parser->offset] == 0x3fc) {
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/* composite */
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i += 1;
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composite = TRUE;
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} else if (data[parser->offset] == 0x000 &&
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data[parser->offset + 1] == 0x3ff &&
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data[parser->offset + 1] == 0x3ff) {
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/* component */
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i += 3;
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composite = FALSE;
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} else {
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parser->offset += 1;
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continue;
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}
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/* FIXME : Add parity and checksum checks at some point if using
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* 10bit data */
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/* TODO: Might want to check parity bits here but the checksum in
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* the end should really be enough */
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/* 4 words: DID, SDID, DC, [DATA], checksum */
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if (parser->offset + i + 4 >= parser->work_data_size)
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goto not_enough_data;
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/* We have a valid ADF */
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DID = data[parser->offset + 3] & 0xff;
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SDID = data[parser->offset + 4] & 0xff;
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DC = data[parser->offset + 5] & 0xff;
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/* Check if we have enough room to get the User Data */
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if (parser->offset + SMALLEST_ANC_SIZE + DC >= parser->work_data_size)
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DID = data[parser->offset + i] & 0xff;
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SDID = data[parser->offset + i + 1] & 0xff;
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DC = data[parser->offset + i + 2] & 0xff;
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i += 3;
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/* Check if we have enough room to get the User Data and checksum */
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if (parser->offset + i + DC + 1 >= parser->work_data_size)
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goto not_enough_data;
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/* We found a valid ANC \o/ */
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@ -125,10 +145,29 @@ get_ancillary_16 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
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anc->SDID_block_number = SDID;
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anc->data_count = DC;
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memset (anc->data, 0, 256);
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for (i = 0; i < anc->data_count; i++)
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anc->data[i] = data[parser->offset + 6 + i] & 0xff;
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/* i is at the beginning of the user data now */
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for (j = 0; j < anc->data_count; j++)
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anc->data[j] = data[parser->offset + i + j] & 0xff;
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i += DC;
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/* Checksum calculation SMPTE S291 3.2.1 */
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for (j = (composite ? 1 : 3); j < i; j++)
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checksum += data[parser->offset + j] & 0x1ff;
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checksum &= 0x1ff;
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checksum |= (!(checksum >> 8)) << 9;
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if (checksum != (data[parser->offset + i] & 0x3ff)) {
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GST_WARNING ("ADF checksum mismatch: expected 0x%03x, got 0x%03x",
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checksum, (data[parser->offset + i] & 0x3ff));
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parser->offset += 1;
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continue;
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}
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i += 1;
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found = TRUE;
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parser->offset += SMALLEST_ANC_SIZE + DC;
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parser->offset += i;
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break;
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}
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@ -140,39 +179,63 @@ get_ancillary_16 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
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/* ERRORS */
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not_enough_data:
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{
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GST_WARNING ("ANC requires more User Data that available line size");
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GST_WARNING ("ANC requires more User Data than available line size");
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/* Avoid further calls to go in the same error */
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parser->offset = parser->work_data_size;
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return GST_VIDEO_VBI_PARSER_RESULT_ERROR;
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}
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}
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/* See SMPTE S291 */
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static GstVideoVBIParserResult
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get_ancillary_8 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
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{
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gboolean found = FALSE;
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guint8 *data = parser->work_data;
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const guint8 *data = parser->work_data;
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g_return_val_if_fail (parser != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
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g_return_val_if_fail (anc != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
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while (parser->offset + SMALLEST_ANC_SIZE < parser->work_data_size) {
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/* 3 words are needed at least to detect what kind of packet we look at
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*
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* - ADF (SMPTE S291 3.2.1) in case of component ancillary format:
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* 0x000 0x3ff 0x3ff (followed by DID, SDID)
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* - ADF (SMPTE S291 3.2.2) in case of composite ancillary format:
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* 0x3fc DID SDID
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*/
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while (parser->offset + 3 < parser->work_data_size) {
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guint8 DID, SDID, DC;
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guint i;
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guint i = 0, j;
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gboolean composite;
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guint checksum = 0;
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/* Look for 8bit ADF (0x00 0xff 0xff) */
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if (data[parser->offset] != 0x00 ||
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data[parser->offset + 1] != 0xff || data[parser->offset + 2] != 0xff) {
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/* Look for ADF */
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if (data[parser->offset] == 0xfc) {
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/* composite */
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composite = TRUE;
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i += 1;
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} else if (data[parser->offset] == 0x00 &&
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data[parser->offset + 1] == 0xff && data[parser->offset + 1] == 0xff) {
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/* component */
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composite = FALSE;
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i += 3;
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} else {
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parser->offset += 1;
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continue;
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}
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/* 4 words: DID, SDID, DC, [DATA], checksum */
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if (parser->offset + i + 4 >= parser->work_data_size)
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goto not_enough_data;
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/* We have a valid ADF */
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DID = data[parser->offset + 3];
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SDID = data[parser->offset + 4];
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DC = data[parser->offset + 5];
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/* Check if we have enough room to get the User Data */
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if (parser->offset + SMALLEST_ANC_SIZE + DC >= parser->work_data_size)
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DID = data[parser->offset + i];
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SDID = data[parser->offset + i + 1];
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DC = data[parser->offset + i + 2];
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i += 3;
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/* Check if we have enough room to get the User Data and checksum */
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if (parser->offset + i + DC + 1 >= parser->work_data_size)
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goto not_enough_data;
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/* We found a valid ANC \o/ */
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@ -180,10 +243,28 @@ get_ancillary_8 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
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anc->SDID_block_number = SDID;
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anc->data_count = DC;
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memset (anc->data, 0, 256);
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for (i = 0; i < anc->data_count; i++)
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anc->data[i] = data[parser->offset + 6 + i];
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/* i is at the beginning of the user data now */
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for (j = 0; j < anc->data_count; j++)
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anc->data[j] = data[parser->offset + i + j] & 0xff;
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i += DC;
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/* Checksum calculation SMPTE S291 3.2.1 */
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for (j = (composite ? 1 : 3); j < i; j++)
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checksum += data[parser->offset + j];
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checksum &= 0xff;
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if (checksum != data[parser->offset + i]) {
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GST_WARNING ("ADF checksum mismatch: expected 0x%02x, got 0x%02x",
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checksum, data[parser->offset + i]);
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parser->offset += 1;
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continue;
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}
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i += 1;
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found = TRUE;
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parser->offset += SMALLEST_ANC_SIZE + DC;
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parser->offset += i;
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break;
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}
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@ -195,7 +276,7 @@ get_ancillary_8 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
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/* ERRORS */
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not_enough_data:
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{
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GST_WARNING ("ANC requires more User Data that available line size");
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GST_WARNING ("ANC requires more User Data than available line size");
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/* Avoid further calls to go in the same error */
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parser->offset = parser->work_data_size;
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return GST_VIDEO_VBI_PARSER_RESULT_ERROR;
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@ -54,6 +54,7 @@ GST_START_TEST (parse_8bit)
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line[38] = 0x60;
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line[40] = 0x70;
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line[42] = 0x80;
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line[44] = 0xf9; /* checksum */
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gst_video_vbi_parser_add_line (parser, line);
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@ -84,6 +85,7 @@ GST_START_TEST (parse_8bit)
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line[31] = 0x03;
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line[33] = 0x02;
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line[35] = 0x01;
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line[37] = 0x75; /* checksum */
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gst_video_vbi_parser_add_line (parser, line);
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@ -146,6 +148,7 @@ GST_START_TEST (parse_10bit)
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GST_WRITE_UINT32_LE (line + 44, (0x260 << 10));
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GST_WRITE_UINT32_LE (line + 48, (0x170 << 0) | (0x180 << 20));
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GST_WRITE_UINT32_LE (line + 52, (0x2f9 << 10));
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gst_video_vbi_parser_add_line (parser, line);
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@ -174,9 +177,10 @@ GST_START_TEST (parse_10bit)
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GST_WRITE_UINT32_LE (line + 32, (0x101 << 0) | (0x102 << 20) | (0x104 << 10));
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GST_WRITE_UINT32_LE (line + 36, (0x203 << 10) | (0x203 << 0) | (0x102 << 20));
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GST_WRITE_UINT32_LE (line + 40, (0x104 << 0) | (0x250 << 20) | (0x101 << 10));
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GST_WRITE_UINT32_LE (line + 44, (0x260 << 10));
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GST_WRITE_UINT32_LE (line + 44, (0x275 << 0) | (0x260 << 10));
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GST_WRITE_UINT32_LE (line + 48, (0x170 << 0) | (0x180 << 20));
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GST_WRITE_UINT32_LE (line + 52, (0x2f9 << 10));
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gst_video_vbi_parser_add_line (parser, line);
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