Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / libzmpeg3 / audio / pcm.C

diff --git a/cinelerra-5.1/libzmpeg3/audio/pcm.C b/cinelerra-5.1/libzmpeg3/audio/pcm.C
new file mode 100644 (file)
index 0000000..5a93279
--- /dev/null
+++ b/cinelerra-5.1/libzmpeg3/audio/pcm.C
@@ -0,0 +1,67 @@
+#include "../libzmpeg3.h"
+
+int pcm_check(uint8_t *header)
+{
+  if( header[0] == ((zmpeg3_t::PCM_START_CODE >> 24) & 0xff) &&
+      header[1] == ((zmpeg3_t::PCM_START_CODE >> 16) & 0xff) &&
+      header[2] == ((zmpeg3_t::PCM_START_CODE >>  8) & 0xff) &&
+      header[3] == ((zmpeg3_t::PCM_START_CODE >>  0) & 0xff) )
+    return 0;
+  return 1;
+}
+
+int zaudio_decoder_pcm_t::
+pcm_header(uint8_t *data)
+{
+  if( pcm_check(data) ) return 0;
+
+/* Custom header generated by the demuxer */
+  samplerate = *(int32_t*)(data + 4);
+  bits = *(int32_t*)(data + 8);
+  channels = *(int32_t*)(data + 12);
+  framesize = *(int32_t*)(data + 16);
+
+  return framesize;
+}
+
+int zaudio_decoder_pcm_t::
+do_pcm(uint8_t *zframe, int zframe_size, float **zoutput, int render)
+{
+  int i, j;
+  int bytes_per_sample = bits / 8 * channels;
+  int output_size =
+    (zframe_size - zaudio_t::PCM_HEADERSIZE) / bytes_per_sample;
+//zmsgs("2 %d\n", zframe_size);
+
+  if( render ) {
+    for( i=0; i < channels; ++i ) {
+//zmsg("3\n");
+      float *output_channel = zoutput[i];
+//zmsg("4\n");
+      switch( bits ) {
+      case 16:
+//zmsg("5\n");
+        uint8_t *input =
+          zframe + zaudio_t::PCM_HEADERSIZE + bits / 8 * i;
+//zmsg("6\n");
+        for( j=0; j < output_size; ++j ) {
+          int16_t sample = ((int16_t)(input[0])) << 8;
+          sample |= input[1];
+          *output_channel = (float)sample / 32767.0;
+          input += bytes_per_sample;
+          ++output_channel;
+        }
+        break;
+//zmsg("7\n");
+      }
+    }
+  }
+
+//zmsgs("2 %02x%02x%02x%02x\n", 
+//  *(uint8_t*)(zframe+zaudio_t::PCM_HEADERSIZE + 0),
+//  *(uint8_t*)(zframe+zaudio_t::PCM_HEADERSIZE + 1),
+//  *(uint8_t*)(zframe+zaudio_t::PCM_HEADERSIZE + 2),
+//  *(uint8_t*)(zframe+zaudio_t::PCM_HEADERSIZE + 3));
+  return output_size;
+}
+