/**************************************************************************//**
* Read/skip data from the container.
* Can also be used to query information about the next block of data.
*
* @param p_ctx The reader context.
* @param p_packet The container packet information, or NULL.
* @param flags The container read flags.
* @return The resulting status of the function.
*/
static VC_CONTAINER_STATUS_T rtp_reader_read( VC_CONTAINER_T *p_ctx,
VC_CONTAINER_PACKET_T *p_packet,
uint32_t flags )
{
VC_CONTAINER_TRACK_T *track;
VC_CONTAINER_TRACK_MODULE_T *t_module;
VC_CONTAINER_STATUS_T status;
if((flags & VC_CONTAINER_READ_FLAG_FORCE_TRACK) && p_packet->track)
return VC_CONTAINER_ERROR_INVALID_ARGUMENT;
track = p_ctx->tracks[0];
t_module = track->priv->module;
CLEAR_BIT(t_module->flags, TRACK_NEW_PACKET);
while (!BITS_AVAILABLE(p_ctx, &t_module->payload))
{
uint32_t bytes_read;
/* No data left from last RTP packet, get another one */
bytes_read = READ_BYTES(p_ctx, t_module->buffer, MAXIMUM_PACKET_SIZE);
if (!bytes_read)
return STREAM_STATUS(p_ctx);
BITS_INIT(p_ctx, &t_module->payload, t_module->buffer, bytes_read);
decode_rtp_packet_header(p_ctx, t_module);
SET_BIT(t_module->flags, TRACK_NEW_PACKET);
}
if (p_packet)
{
uint32_t timestamp_top = t_module->timestamp >> 30;
/* Determine whether timestamp has wrapped forwards or backwards around zero */
if ((timestamp_top == 0) && (t_module->last_timestamp_top == 3))
t_module->timestamp_wraps++;
else if ((timestamp_top == 3) && (t_module->last_timestamp_top == 0))
t_module->timestamp_wraps--;
t_module->last_timestamp_top = timestamp_top;
p_packet->dts = p_packet->pts = ((int64_t)t_module->timestamp_wraps << 32) | t_module->timestamp;
p_packet->track = 0;
p_packet->flags = 0;
}
status = t_module->payload_handler(p_ctx, track, p_packet, flags);
if (p_packet && status == VC_CONTAINER_SUCCESS)
{
/* Adjust timestamps from RTP clock rate to microseconds */
p_packet->pts = p_packet->pts * MICROSECONDS_PER_SECOND / t_module->timestamp_clock;
p_packet->dts = p_packet->dts * MICROSECONDS_PER_SECOND / t_module->timestamp_clock;
}
STREAM_STATUS(p_ctx) = status;
return status;
}
static VC_CONTAINER_STATUS_T ps_read_system_header( VC_CONTAINER_T *ctx )
{
uint8_t header[8];
uint32_t length;
VC_CONTAINER_BITS_T bits;
if(_READ_U32(ctx) != 0x1BB) return VC_CONTAINER_ERROR_CORRUPTED;
LOG_FORMAT(ctx, "system_header");
ctx->priv->module->level++;
length = READ_U16(ctx, "header_length");
if(length < 6) return VC_CONTAINER_ERROR_CORRUPTED;
if(READ_BYTES(ctx, header, 6) != 6) return VC_CONTAINER_ERROR_EOS;
BITS_INIT(ctx, &bits, header, 6);
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
BITS_SKIP(ctx, &bits, 22, "rate_bound");
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
BITS_SKIP(ctx, &bits, 6, "audio_bound");
BITS_SKIP(ctx, &bits, 1, "fixed_flag");
BITS_SKIP(ctx, &bits, 1, "CSPS_flag");
BITS_SKIP(ctx, &bits, 1, "system_audio_lock_flag");
BITS_SKIP(ctx, &bits, 1, "system_video_lock_flag");
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
BITS_SKIP(ctx, &bits, 5, "video_bound");
BITS_SKIP(ctx, &bits, 1, "packet_rate_restriction_flag");
BITS_SKIP(ctx, &bits, 7, "reserved_bits");
length -= 6;
while(length >= 3 && (PEEK_U8(ctx) & 0x80))
{
SKIP_U8(ctx, "stream_id");
SKIP_BYTES(ctx, 2);
length -= 3;
}
SKIP_BYTES(ctx, length);
ctx->priv->module->level--;
return STREAM_STATUS(ctx);
}
static VC_CONTAINER_STATUS_T ps_read_pack_header( VC_CONTAINER_T *ctx )
{
VC_CONTAINER_MODULE_T *module = ctx->priv->module;
uint8_t header[10];
int64_t scr, scr_base, scr_ext = INT64_C(0);
uint64_t pack_offset = STREAM_POSITION(ctx);
uint32_t mux_rate, stuffing;
VC_CONTAINER_BITS_T bits;
VC_CONTAINER_STATUS_T status;
if(_READ_U32(ctx) != 0x1BA) return VC_CONTAINER_ERROR_CORRUPTED;
LOG_FORMAT(ctx, "pack_header");
module->level++;
if (PEEK_U8(ctx) & 0x40) /* program stream */
{
if(READ_BYTES(ctx, header, 10) != 10) return VC_CONTAINER_ERROR_EOS;
BITS_INIT(ctx, &bits, header, 10);
if(BITS_READ_U32(ctx, &bits, 2, "'01' marker bits") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
scr_base = BITS_READ_U32(ctx, &bits, 3, "system_clock_reference_base [32..30]") << 30;
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
scr_base |= BITS_READ_U32(ctx, &bits, 15, "system_clock_reference_base [29..15]") << 15;
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
scr_base |= BITS_READ_U32(ctx, &bits, 15, "system_clock_reference_base [14..0]");
LOG_FORMAT(ctx, "system_clock_reference_base %"PRId64, scr_base);
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
scr_ext = BITS_READ_U32(ctx, &bits, 9, "system_clock_reference_extension");
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
mux_rate = BITS_READ_U32(ctx, &bits, 22, "program_mux_rate");
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
BITS_SKIP(ctx, &bits, 5, "reserved");
stuffing = BITS_READ_U32(ctx, &bits, 3, "pack_stuffing_length");
SKIP_BYTES(ctx, stuffing);
}
else /* system stream */
{
if(READ_BYTES(ctx, header, 8) != 8) return VC_CONTAINER_ERROR_EOS;
BITS_INIT(ctx, &bits, header, 8);
if(BITS_READ_U32(ctx, &bits, 4, "'0010' marker bits") != 0x2) return VC_CONTAINER_ERROR_CORRUPTED;
scr_base = BITS_READ_U32(ctx, &bits, 3, "system_clock_reference_base [32..30]") << 30;
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
scr_base |= BITS_READ_U32(ctx, &bits, 15, "system_clock_reference_base [29..15]") << 15;
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
scr_base |= BITS_READ_U32(ctx, &bits, 15, "system_clock_reference_base [14..0]");
LOG_FORMAT(ctx, "system_clock_reference_base %"PRId64, scr_base);
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
mux_rate = BITS_READ_U32(ctx, &bits, 22, "program_mux_rate");
if(BITS_READ_U32(ctx, &bits, 1, "marker_bit") != 0x1) return VC_CONTAINER_ERROR_CORRUPTED;
}
if ((status = STREAM_STATUS(ctx)) != VC_CONTAINER_SUCCESS) return status;
module->level--;
/* Set or update system_clock_reference, adjust bias if necessary */
scr = scr_base * INT64_C(300) + scr_ext;
if (module->scr_offset == VC_CONTAINER_TIME_UNKNOWN)
module->scr_offset = scr;
if (module->scr == VC_CONTAINER_TIME_UNKNOWN)
module->scr_bias = -scr;
else if (scr < module->scr)
module->scr_bias = module->scr - scr;
if (module->scr != VC_CONTAINER_TIME_UNKNOWN)
{
/* system_clock_reference is not necessarily continuous across the entire stream */
if (scr > module->scr)
{
int64_t data_rate;
data_rate = INT64_C(27000000) * (pack_offset - module->pack_offset) / (scr - module->scr);
if (module->data_rate)
{
/* Simple moving average over data rate seen so far */
module->data_rate = (module->data_rate * 31 + data_rate) >> 5;
}
else
{