+/*
+ * recording function
+ * Records all data from down and from up into one single stream.
+ * Both streams may have gaps or jitter.
+ * A Jitter buffer for both streams is used to compensate jitter.
+ *
+ * If one stream (dir) received packets, they are stored to a
+ * buffer to wait for the other stream (dir), so both streams can
+ * be combined. If the buffer is full, it's read pointer is written
+ * without mixing stream.
+ * A flag is used to indicate what stream is currently in buffer.
+ *
+ * NOTE: First stereo sample (odd) is from down, second is from up.
+ */
+alle buffer initialisieren
+record nur aufrufen, wenn recorded wird.
+restlicher buffer wegschreiben beim schliessen
+void Port::record(char *data, int length, int dir_fromup)
+{
+ unsigned char write_buffer[1024], *d;
+ signed short *s;
+ int r, w;
+ signed long sample;
+
+ /* no recording */
+ if (!p_record || !length)
+ return;
+
+ free = ((p_record_buffer_readp - p_record_buffer_writep - 1) & RECORD_BUFFER_MASK);
+
+ /* the buffer stores the same data stream */
+ if (dir_fromup == p_record_buffer_dir)
+ {
+ same_again:
+
+ /* first write what we can to the buffer */
+ while(free && length)
+ {
+ p_record_buffer[p_record_buffer_writep] = audio_law_to_s32(*data++);
+ p_record_buffer_writep = (p_record_buffer_writep + 1) & RECORD_BUFFER_MASK;
+ free--;
+ length--;
+ }
+ /* all written, so we return */
+ if (!length)
+ return;
+ /* still data left, buffer is full, so we need to write to file */
+ switch(p_record_type)
+ {
+ case CODEC_MONO:
+ s = (signed short *)write_buffer;
+ i = 0;
+ while(i < 256)
+ {
+ *s++ = p_record_buffer[p_record_buffer_readp];
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ i++;
+ }
+ fwrite(write_buffer, 512, 1, p_record);
+ break;
+
+ case CODEC_STEREO:
+ s = (signed short *)write_buffer;
+ if (p_record_buffer_dir)
+ {
+ i = 0;
+ while(i < 256)
+ {
+ *s++ = 0; /* nothing from down */
+ *s++ = p_record_buffer[p_record_buffer_readp];
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ i++;
+ }
+ } else
+ {
+ i = 0;
+ while(i < 256)
+ {
+ *s++ = p_record_buffer[p_record_buffer_readp];
+ *s++ = 0; /* nothing from up */
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ i++;
+ }
+ }
+ fwrite(write_buffer, 1024, 1, p_record);
+ break;
+
+ case CODEC_8BIT:
+ d = write_buffer;
+ i = 0;
+ while(i < 256)
+ {
+ *d++ = (p_record_buffer[p_record_buffer_readp]+0x8000) >> 8;
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ i++;
+ }
+ fwrite(write_buffer, 512, 1, p_record);
+ break;
+
+ case CODEC_LAW:
+ d = write_buffer;
+ i = 0;
+ while(i < 256)
+ {
+ *d++ = audio_s16_to_law[p_record_buffer[p_record_buffer_readp] & 0xffff];
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ i++;
+ }
+ fwrite(write_buffer, 256, 1, p_record);
+ break;
+ }
+ /* because we still have data, we write again */
+ free += sizeof(write_buffer);
+ goto same_again;
+ }
+
+ /* the buffer store the other stream */
+ different_again:
+
+ /* if buffer empty, change it */
+ if (p_record_buffer_readp == p_record_buffer_writep)
+ {
+ p_record_buffer_dir = dir_fromup;
+ goto same_again;
+ }
+ /* how much data can we mix ? */
+ ii = (p_record_buffer_writep - p_record_buffer_readp) & RECORD_BUFFER_MASK;
+ if (length < ii)
+ ii = length;
+ /* write data mixed with the buffer */
+ switch(p_record_type)
+ {
+ case CODEC_MONO:
+ s = (signed short *)write_buffer;
+ i = 0;
+ while(i < ii)
+ {
+ sample = p_record_buffer[p_record_buffer_readp]
+ + audio_law_to_s32(*data++);
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ if (sample < 32767)
+ sample = -32767;
+ if (sample > 32768)
+ sample = 32768;
+ *s++ = sample;
+ i++;
+ }
+ fwrite(write_buffer, ii<<1, 1, p_record);
+ break;
+
+ case CODEC_STEREO:
+ s = (signed short *)write_buffer;
+ if (p_record_buffer_dir)
+ {
+ i = 0;
+ while(i < ii)
+ {
+ *s++ = audio_law_to_s32(*data++);
+ *s++ = p_record_buffer[p_record_buffer_readp];
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ i++;
+ }
+ } else
+ {
+ i = 0;
+ while(i < ii)
+ {
+ *s++ = p_record_buffer[p_record_buffer_readp];
+ *s++ = audio_law_to_s32(*data++);
+ i++;
+ }
+ }
+ fwrite(write_buffer, ii<<2, 1, p_record);
+ break;
+
+ case CODEC_8BIT:
+ d = write_buffer;
+ i = 0;
+ while(i < ii)
+ {
+ sample = p_record_buffer[p_record_buffer_readp]
+ + audio_law_to_s32(*data++);
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ if (sample < 32767)
+ sample = -32767;
+ if (sample > 32768)
+ sample = 32768;
+ *d++ = (sample+0x8000) >> 8;
+ i++;
+ }
+ fwrite(write_buffer, ii, 1, p_record);
+ break;
+
+ case CODEC_LAW:
+ d = write_buffer;
+ i = 0;
+ while(i < ii)
+ {
+ sample = p_record_buffer[p_record_buffer_readp]
+ + audio_law_to_s32(*data++);
+ p_record_buffer_readp = (p_record_buffer_readp + 1) & RECORD_BUFFER_MASK;
+ if (sample < 32767)
+ sample = -32767;
+ if (sample > 32768)
+ sample = 32768;
+ *d++ = audio_s16_to_law[sample & 0xffff];
+ i++;
+ }
+ fwrite(write_buffer, ii, 1, p_record);
+ break;
+ }
+ length -= ii;
+ /* data, but buffer empty */
+ if (length)
+ {
+ p_record_buffer_dir = dir_fromup;
+ goto same_again;
+ }
+ /* no data (maybe buffer) */
+ return;
+
+}
+
+
+/*
+ * enque data from upper buffer
+ */
+iniialisieren der werte
+void Port::txfromup(unsigned char *data, int length)
+{
+
+ /* no recording */
+ if (!length)
+ return;
+
+ /* get free samples in buffer */
+ free = ((p_fromup_buffer_readp - p_fromup_buffer_writep - 1) & FROMUP_BUFFER_MASK);
+ if (free < length)
+ {
+ PDEBUG(DEBUG_PORT, "Port(%d): fromup_buffer overflows, this shall not happen under normal conditions\n", p_serial);
+ return;
+ }
+
+ /* write data to buffer and return */
+ while(length)
+ {
+ p_fromup_buffer[p_fromup_buffer_writep] = *data++;
+ p_fromup_buffer_writep = (p_fromup_buffer_writep + 1) & FROMUP_BUFFER_MASK;
+ length--;
+ }
+ return; // must return, because length is 0
+}
projects / lcr.git / commitdiff