1 files changed, 51 insertions, 0 deletions

diff --git a/core/multimedia/opieplayer/libmpeg3/audio/pcm.c b/core/multimedia/opieplayer/libmpeg3/audio/pcm.c
new file mode 100644
index 0000000..8fa0d25
--- a/dev/null
+++ b/core/multimedia/opieplayer/libmpeg3/audio/pcm.c
@@ -0,0 +1,51 @@
+#include "mpeg3audio.h"
+#include "../libmpeg3.h"
+#include "../mpeg3protos.h"
+
+int mpeg3audio_read_pcm_header(mpeg3audio_t *audio)
+{
+        unsigned int code;
+        
+        code = mpeg3bits_getbits(audio->astream, 16);
+        while(!mpeg3bits_eof(audio->astream) && code != MPEG3_PCM_START_CODE)
+        {
+                code <<= 8;
+                code &= 0xffff;
+                code |= mpeg3bits_getbits(audio->astream, 8);
+        }
+
+        audio->avg_framesize = audio->framesize = 0x7db;
+        audio->channels = 2;
+        
+        return mpeg3bits_eof(audio->astream);
+}
+
+int mpeg3audio_do_pcm(mpeg3audio_t *audio)
+{
+        int i, j, k;
+        MPEG3_INT16 sample;
+        int frame_samples = (audio->framesize - 3) / audio->channels / 2;
+
+        if(mpeg3bits_read_buffer(audio->astream, audio->ac3_buffer, frame_samples * audio->channels * 2))
+                return 1;
+
+/* Need more room */
+        if(audio->pcm_point / audio->channels >= audio->pcm_allocated - MPEG3AUDIO_PADDING * audio->channels)
+        {
+                mpeg3audio_replace_buffer(audio, audio->pcm_allocated + MPEG3AUDIO_PADDING * audio->channels);
+        }
+
+        k = 0;
+        for(i = 0; i < frame_samples; i++)
+        {
+                for(j = 0; j < audio->channels; j++)
+                {
+                        sample = ((MPEG3_INT16)(audio->ac3_buffer[k++])) << 8;
+                        sample |= audio->ac3_buffer[k++];
+                        audio->pcm_sample[audio->pcm_point + i * audio->channels + j] = 
+                                (mpeg3_real_t)sample / 32767;
+                }
+        }
+        audio->pcm_point += frame_samples * audio->channels;
+        return 0;
+}