static gboolean
gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
{
GstH264Parse *h264parse;
GstStructure *str;
const GValue *value;
GstBuffer *buffer = NULL;
guint size;
h264parse = GST_H264_PARSE (parse);
/* reset */
h264parse->push_codec = FALSE;
str = gst_caps_get_structure (caps, 0);
/* accept upstream info if provided */
gst_structure_get_int (str, "width", &h264parse->width);
gst_structure_get_int (str, "height", &h264parse->height);
gst_structure_get_fraction (str, "framerate", &h264parse->fps_num,
&h264parse->fps_den);
/* packetized video has a codec_data */
if ((value = gst_structure_get_value (str, "codec_data"))) {
guint8 *data;
guint num_sps, num_pps, profile, len;
gint i;
GST_DEBUG_OBJECT (h264parse, "have packetized h264");
/* make note for optional split processing */
h264parse->packetized = TRUE;
buffer = gst_value_get_buffer (value);
if (!buffer)
goto wrong_type;
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
/* parse the avcC data */
if (size < 7)
goto avcc_too_small;
/* parse the version, this must be 1 */
if (data[0] != 1)
goto wrong_version;
/* AVCProfileIndication */
/* profile_compat */
/* AVCLevelIndication */
profile = (data[1] << 16) | (data[2] << 8) | data[3];
GST_DEBUG_OBJECT (h264parse, "profile %06x", profile);
/* 6 bits reserved | 2 bits lengthSizeMinusOne */
/* this is the number of bytes in front of the NAL units to mark their
* length */
h264parse->nal_length_size = (data[4] & 0x03) + 1;
GST_DEBUG_OBJECT (h264parse, "nal length %u", h264parse->nal_length_size);
num_sps = data[5] & 0x1f;
data += 6;
size -= 6;
for (i = 0; i < num_sps; i++) {
len = GST_READ_UINT16_BE (data);
if (size < len + 2 || len < 2)
goto avcc_too_small;
/* digest for later reference */
gst_h264_parse_process_nal (h264parse, data, 0, 2, len);
data += len + 2;
size -= len + 2;
}
num_pps = data[0];
data++;
size++;
for (i = 0; i < num_pps; i++) {
len = GST_READ_UINT16_BE (data);
if (size < len + 2 || len < 2)
goto avcc_too_small;
/* digest for later reference */
gst_h264_parse_process_nal (h264parse, data, 0, 2, len);
data += len + 2;
size -= len + 2;
}
} else {
GST_DEBUG_OBJECT (h264parse, "have bytestream h264");
/* nothing to pre-process */
h264parse->packetized = FALSE;
/* we have 4 sync bytes */
h264parse->nal_length_size = 4;
}
if (h264parse->packetized) {
if (h264parse->split_packetized) {
GST_DEBUG_OBJECT (h264parse,
"converting AVC to nal bytestream prior to parsing");
/* negotiate behaviour with upstream */
gst_h264_parse_negotiate (h264parse);
if (h264parse->format == GST_H264_PARSE_FORMAT_BYTE) {
/* arrange to insert codec-data in-stream if needed */
h264parse->push_codec = h264parse->packetized;
}
} else {
GST_DEBUG_OBJECT (h264parse, "passing on packetized AVC");
/* no choice to negotiate */
h264parse->format = GST_H264_PARSE_FORMAT_AVC;
h264parse->align = GST_H264_PARSE_ALIGN_AU;
/* fallback codec-data */
h264parse->codec_data = gst_buffer_ref (buffer);
/* pass through unharmed, though _chain will parse a bit */
gst_base_parse_set_format (parse,
GST_BASE_PARSE_FORMAT_PASSTHROUGH, TRUE);
/* we did parse codec-data and might supplement src caps */
gst_h264_parse_update_src_caps (h264parse);
}
}
/* src caps are only arranged for later on */
return TRUE;
/* ERRORS */
avcc_too_small:
{
GST_DEBUG_OBJECT (h264parse, "avcC size %u < 7", size);
goto refuse_caps;
}
wrong_version:
{
GST_DEBUG_OBJECT (h264parse, "wrong avcC version");
goto refuse_caps;
}
wrong_type:
{
GST_DEBUG_OBJECT (h264parse, "wrong codec-data type");
goto refuse_caps;
}
refuse_caps:
{
GST_WARNING_OBJECT (h264parse, "refused caps %" GST_PTR_FORMAT, caps);
return FALSE;
}
}
static gboolean
gst_h264_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
{
GstH264Parse *h264parse;
GstStructure *str;
const GValue *value;
GstBuffer *codec_data = NULL;
guint size, format, align;
h264parse = GST_H264_PARSE (parse);
/* reset */
h264parse->push_codec = FALSE;
str = gst_caps_get_structure (caps, 0);
/* accept upstream info if provided */
gst_structure_get_int (str, "width", &h264parse->width);
gst_structure_get_int (str, "height", &h264parse->height);
gst_structure_get_fraction (str, "framerate", &h264parse->fps_num,
&h264parse->fps_den);
/* get upstream format and align from caps */
gst_h264_parse_format_from_caps (caps, &format, &align);
/* packetized video has a codec_data */
if (format != GST_H264_PARSE_FORMAT_BYTE &&
(value = gst_structure_get_value (str, "codec_data"))) {
guint8 *data;
guint num_sps, num_pps, profile, len;
gint i;
GST_DEBUG_OBJECT (h264parse, "have packetized h264");
/* make note for optional split processing */
h264parse->packetized = TRUE;
codec_data = gst_value_get_buffer (value);
if (!codec_data)
goto wrong_type;
data = GST_BUFFER_DATA (codec_data);
size = GST_BUFFER_SIZE (codec_data);
/* parse the avcC data */
if (size < 7)
goto avcc_too_small;
/* parse the version, this must be 1 */
if (data[0] != 1)
goto wrong_version;
/* AVCProfileIndication */
/* profile_compat */
/* AVCLevelIndication */
profile = (data[1] << 16) | (data[2] << 8) | data[3];
GST_DEBUG_OBJECT (h264parse, "profile %06x", profile);
/* 6 bits reserved | 2 bits lengthSizeMinusOne */
/* this is the number of bytes in front of the NAL units to mark their
* length */
h264parse->nal_length_size = (data[4] & 0x03) + 1;
GST_DEBUG_OBJECT (h264parse, "nal length %u", h264parse->nal_length_size);
num_sps = data[5] & 0x1f;
data += 6;
size -= 6;
for (i = 0; i < num_sps; i++) {
len = GST_READ_UINT16_BE (data);
if (size < len + 2 || len < 2)
goto avcc_too_small;
/* digest for later reference */
gst_h264_parse_process_nal (h264parse, data, 0, 2, len);
data += len + 2;
size -= len + 2;
}
num_pps = data[0];
data++;
size++;
for (i = 0; i < num_pps; i++) {
len = GST_READ_UINT16_BE (data);
if (size < len + 2 || len < 2)
goto avcc_too_small;
/* digest for later reference */
gst_h264_parse_process_nal (h264parse, data, 0, 2, len);
data += len + 2;
size -= len + 2;
}
h264parse->codec_data = gst_buffer_ref (codec_data);
/* if upstream sets codec_data without setting stream-format and alignment, we
* assume stream-format=avc,alignment=au */
if (format == GST_H264_PARSE_FORMAT_NONE) {
format = GST_H264_PARSE_FORMAT_AVC;
align = GST_H264_PARSE_ALIGN_AU;
}
} else {
GST_DEBUG_OBJECT (h264parse, "have bytestream h264");
/* nothing to pre-process */
h264parse->packetized = FALSE;
/* we have 4 sync bytes */
h264parse->nal_length_size = 4;
if (format == GST_H264_PARSE_FORMAT_NONE) {
format = GST_H264_PARSE_FORMAT_BYTE;
align = GST_H264_PARSE_ALIGN_AU;
}
}
/* negotiate with downstream, sets ->format and ->align */
gst_h264_parse_negotiate (h264parse);
if (format == h264parse->format && align == h264parse->align) {
gst_base_parse_set_passthrough (parse, TRUE);
/* we did parse codec-data and might supplement src caps */
gst_h264_parse_update_src_caps (h264parse, caps);
} else if (format == GST_H264_PARSE_FORMAT_AVC) {
/* if input != output, and input is avc, must split before anything else */
/* arrange to insert codec-data in-stream if needed.
* src caps are only arranged for later on */
h264parse->push_codec = TRUE;
h264parse->split_packetized = TRUE;
h264parse->packetized = TRUE;
}
return TRUE;
/* ERRORS */
avcc_too_small:
{
GST_DEBUG_OBJECT (h264parse, "avcC size %u < 7", size);
goto refuse_caps;
}
wrong_version:
{
GST_DEBUG_OBJECT (h264parse, "wrong avcC version");
goto refuse_caps;
}
wrong_type:
{
GST_DEBUG_OBJECT (h264parse, "wrong codec-data type");
goto refuse_caps;
}
unknown_input_format:
{
GST_DEBUG_OBJECT (h264parse, "unknown stream-format and no codec_data");
goto refuse_caps;
}
refuse_caps:
{
GST_WARNING_OBJECT (h264parse, "refused caps %" GST_PTR_FORMAT, caps);
return FALSE;
}
}
static gboolean
gst_h264_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GstBuffer *buffer = frame->buffer;
gint sc_pos, nal_pos, next_sc_pos, next_nal_pos;
guint8 *data;
guint size;
gboolean drain;
/* expect at least 3 bytes startcode == sc, and 2 bytes NALU payload */
if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < 5))
return FALSE;
/* need to configure aggregation */
if (G_UNLIKELY (h264parse->format == GST_H264_PARSE_FORMAT_NONE))
gst_h264_parse_negotiate (h264parse);
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
GST_LOG_OBJECT (h264parse, "last_nal_pos: %d, last_scan_pos %d",
h264parse->last_nal_pos, h264parse->next_sc_pos);
nal_pos = h264parse->last_nal_pos;
next_sc_pos = h264parse->next_sc_pos;
if (!next_sc_pos) {
sc_pos = gst_h264_parse_find_sc (buffer, 0);
if (sc_pos == -1) {
/* SC not found, need more data */
sc_pos = GST_BUFFER_SIZE (buffer) - 3;
goto more;
}
nal_pos = sc_pos + 3;
next_sc_pos = nal_pos;
/* sc might have 2 or 3 0-bytes */
if (sc_pos > 0 && data[sc_pos - 1] == 00)
sc_pos--;
GST_LOG_OBJECT (h264parse, "found sc at offset %d", sc_pos);
} else {
/* previous checks already arrange sc at start */
sc_pos = 0;
}
drain = GST_BASE_PARSE_FRAME_DRAIN (frame);
while (TRUE) {
gint prev_sc_pos;
next_sc_pos = gst_h264_parse_find_sc (buffer, next_sc_pos);
if (next_sc_pos == -1) {
GST_LOG_OBJECT (h264parse, "no next sc");
if (drain) {
/* FLUSH/EOS, it's okay if we can't find the next frame */
next_sc_pos = size;
next_nal_pos = size;
} else {
next_sc_pos = size - 3;
goto more;
}
} else {
next_nal_pos = next_sc_pos + 3;
if (data[next_sc_pos - 1] == 00)
next_sc_pos--;
GST_LOG_OBJECT (h264parse, "found next sc at offset %d", next_sc_pos);
/* need at least 1 more byte of next NAL */
if (!drain && (next_nal_pos == size - 1))
goto more;
}
/* determine nal's sc position */
prev_sc_pos = nal_pos - 3;
g_assert (prev_sc_pos >= 0);
if (prev_sc_pos > 0 && data[prev_sc_pos - 1] == 0)
prev_sc_pos--;
/* already consume and gather info from NAL */
gst_h264_parse_process_nal (h264parse, data, prev_sc_pos, nal_pos,
next_sc_pos - nal_pos);
if (next_nal_pos >= size - 1 ||
gst_h264_parse_collect_nal (h264parse, data + nal_pos,
data + next_nal_pos))
break;
/* move along */
next_sc_pos = nal_pos = next_nal_pos;
}
*skipsize = sc_pos;
*framesize = next_sc_pos - sc_pos;
return TRUE;
more:
/* Ask for 1024 bytes more - this is an arbitrary choice */
gst_base_parse_set_min_frame_size (parse, GST_BUFFER_SIZE (buffer) + 1024);
/* skip up to initial startcode */
*skipsize = sc_pos;
/* resume scanning here next time */
h264parse->last_nal_pos = nal_pos;
h264parse->next_sc_pos = next_sc_pos;
return FALSE;
}
static gboolean
gst_h264_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstH264Parse *h264parse = GST_H264_PARSE (parse);
GstBuffer *buffer = frame->buffer;
gint sc_pos, nal_pos, next_sc_pos, next_nal_pos;
guint8 *data;
guint size;
gboolean drain;
/* expect at least 3 bytes startcode == sc, and 2 bytes NALU payload */
if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < 5))
return FALSE;
/* need to configure aggregation */
if (G_UNLIKELY (h264parse->format == GST_H264_PARSE_FORMAT_NONE))
gst_h264_parse_negotiate (h264parse);
/* avoid stale cached parsing state */
if (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_PARSING)) {
GST_LOG_OBJECT (h264parse, "parsing new frame");
gst_h264_parse_reset_frame (h264parse);
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_PARSING;
} else {
GST_LOG_OBJECT (h264parse, "resuming frame parsing");
}
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
GST_LOG_OBJECT (h264parse, "last_nal_pos: %d, last_scan_pos %d",
h264parse->last_nal_pos, h264parse->next_sc_pos);
nal_pos = h264parse->last_nal_pos;
next_sc_pos = h264parse->next_sc_pos;
if (!next_sc_pos) {
sc_pos = gst_h264_parse_find_sc (buffer, 0);
if (sc_pos == -1) {
/* SC not found, need more data */
sc_pos = GST_BUFFER_SIZE (buffer) - 3;
/* avoid going < 0 later on */
nal_pos = next_sc_pos = sc_pos;
goto more;
}
nal_pos = sc_pos + 3;
next_sc_pos = nal_pos;
/* sc might have 2 or 3 0-bytes */
if (sc_pos > 0 && data[sc_pos - 1] == 00)
sc_pos--;
GST_LOG_OBJECT (h264parse, "found sc at offset %d", sc_pos);
} else {
/* previous checks already arrange sc at start */
sc_pos = 0;
}
drain = GST_BASE_PARSE_DRAINING (parse);
while (TRUE) {
gint prev_sc_pos;
next_sc_pos = gst_h264_parse_find_sc (buffer, next_sc_pos);
if (next_sc_pos == -1) {
GST_LOG_OBJECT (h264parse, "no next sc");
if (drain) {
/* FLUSH/EOS, it's okay if we can't find the next frame */
next_sc_pos = size;
next_nal_pos = size;
} else {
next_sc_pos = size - 3;
goto more;
}
} else {
next_nal_pos = next_sc_pos + 3;
if (data[next_sc_pos - 1] == 00)
next_sc_pos--;
GST_LOG_OBJECT (h264parse, "found next sc at offset %d", next_sc_pos);
/* need at least 1 more byte of next NAL */
if (!drain && (next_nal_pos == size - 1))
goto more;
}
/* determine nal's sc position */
prev_sc_pos = nal_pos - 3;
g_assert (prev_sc_pos >= 0);
if (prev_sc_pos > 0 && data[prev_sc_pos - 1] == 0)
prev_sc_pos--;
/* already consume and gather info from NAL */
if (G_UNLIKELY (next_sc_pos - nal_pos < 2)) {
GST_WARNING_OBJECT (h264parse, "input stream is corrupt; "
"it contains a NAL unit of length %d", next_sc_pos - nal_pos);
/* broken nal at start -> arrange to skip it,
* otherwise have it terminate current au
* (and so it will be skippd on next frame round) */
if (prev_sc_pos == sc_pos) {
*skipsize = sc_pos + 2;
return FALSE;
} else {
next_sc_pos = prev_sc_pos;
break;
}
}
gst_h264_parse_process_nal (h264parse, data, prev_sc_pos, nal_pos,
next_sc_pos - nal_pos);
if (next_nal_pos >= size - 1 ||
gst_h264_parse_collect_nal (h264parse, data + nal_pos,
data + next_nal_pos))
break;
/* move along */
next_sc_pos = nal_pos = next_nal_pos;
}
*skipsize = sc_pos;
*framesize = next_sc_pos - sc_pos;
return TRUE;
more:
/* ask for best next available */
*framesize = G_MAXUINT;
/* skip up to initial startcode */
*skipsize = sc_pos;
/* resume scanning here next time */
h264parse->last_nal_pos = nal_pos - sc_pos;
h264parse->next_sc_pos = next_sc_pos - sc_pos;
return FALSE;
}
