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Fix speed issues with drip_buffer

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Kieran Kunhya 2012-08-03 15:31:26 +01:00
rodzic 393490873f
commit 9e9fc97874
1 zmienionych plików z 11 dodań i 5 usunięć
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libmpegts.c
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@ -210,6 +210,11 @@ static void add_to_buffer( buffer_t *buffer )
static void drip_buffer( ts_writer_t *w, ts_int_program_t *program, int rx, buffer_t *buffer, double next_pcr ) static void drip_buffer( ts_writer_t *w, ts_int_program_t *program, int rx, buffer_t *buffer, double next_pcr )
{ {
int iters;
double offset;
/* Although this uses floating point arithmetic, the values are backed by integers
* Transport buffer fullness does not need to be exact */
double cur_pcr = TS_START + w->packets_written * 8.0 * TS_PACKET_SIZE / w->ts_muxrate; double cur_pcr = TS_START + w->packets_written * 8.0 * TS_PACKET_SIZE / w->ts_muxrate;
if( buffer->last_byte_removal_time == 0.0 ) if( buffer->last_byte_removal_time == 0.0 )
{ {
@ -217,11 +222,12 @@ static void drip_buffer( ts_writer_t *w, ts_int_program_t *program, int rx, buff
buffer->cur_buf -= 8; buffer->cur_buf -= 8;
} }
while( buffer->last_byte_removal_time + (8.0 / rx) < next_pcr ) iters = floor( (next_pcr - buffer->last_byte_removal_time) / (8.0 / rx) );
{
buffer->cur_buf -= 8; buffer->cur_buf -= 8*iters;
buffer->last_byte_removal_time += 8.0 / rx; /* Avoid compounded error from floating point addition by making calculations relative to next_pcr */
} offset = next_pcr - (buffer->last_byte_removal_time + 8.0 * iters / rx);
buffer->last_byte_removal_time = next_pcr - offset;
buffer->cur_buf = MAX( buffer->cur_buf, 0 ); buffer->cur_buf = MAX( buffer->cur_buf, 0 );
} }