From 15318cad33835e4e2dc620d033e43cd930676cdd Mon Sep 17 00:00:00 2001
From: kergoth <kergoth>
Date: Fri, 25 Jan 2002 22:14:26 +0000
Subject: Initial revision

---
(limited to 'core/multimedia/opieplayer/libmpeg3/audio/pcm.c')

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;
+}
--
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