mad: fix stereo audio playback

redchenjs · redchenjs · commit 562008ef587b · 2021-02-20T18:41:19.000+08:00
diff --git a/components/mad/synth.c b/components/mad/synth.c
@@ -707,10 +707,10 @@ void synth_full(struct mad_synth *synth, struct mad_frame const *frame,
 
       *pcm1 = scale(SHIFT(-MLZ(hi, lo)));
       pcm1 += 16;
-
-      phase = (phase + 1) % 16;
     }
 
+    phase = (phase + 1) % 16;
+
     /* render block */
     render_sample_block(synth->pcm.samples[0], synth->pcm.samples[1], synth->pcm.samplerate, nch, 32);
   }
@@ -850,10 +850,10 @@ void synth_half(struct mad_synth *synth, struct mad_frame const *frame,
 
       *pcm1 = scale(SHIFT(-MLZ(hi, lo)));
       pcm1 += 8;
-
-      phase = (phase + 1) % 16;
     }
 
+    phase = (phase + 1) % 16;
+
     /* render block */
     render_sample_block(synth->pcm.samples[0], synth->pcm.samples[1], synth->pcm.samplerate, nch, 16);
   }

Original file line number	Diff line number	Diff line change
`@@ -707,10 +707,10 @@ void synth_full(struct mad_synth synth, struct mad_frame const frame,`
`707`	`707`
`708`	`708`	`*pcm1 = scale(SHIFT(-MLZ(hi, lo)));`
`709`	`709`	`pcm1 += 16;`
`710`		`-`
`711`		`- phase = (phase + 1) % 16;`
`712`	`710`	`}`
`713`	`711`
	`712`	`+ phase = (phase + 1) % 16;`
	`713`	`+`
`714`	`714`	`/* render block */`
`715`	`715`	`render_sample_block(synth->pcm.samples[0], synth->pcm.samples[1], synth->pcm.samplerate, nch, 32);`
`716`	`716`	`}`
`@@ -850,10 +850,10 @@ void synth_half(struct mad_synth synth, struct mad_frame const frame,`
`850`	`850`
`851`	`851`	`*pcm1 = scale(SHIFT(-MLZ(hi, lo)));`
`852`	`852`	`pcm1 += 8;`
`853`		`-`
`854`		`- phase = (phase + 1) % 16;`
`855`	`853`	`}`
`856`	`854`
	`855`	`+ phase = (phase + 1) % 16;`
	`856`	`+`
`857`	`857`	`/* render block */`
`858`	`858`	`render_sample_block(synth->pcm.samples[0], synth->pcm.samples[1], synth->pcm.samplerate, nch, 16);`
`859`	`859`	`}`