Attachment 1963 Details for Bug 11760 – [PATCH 03] dtsdec: downmix to mono or stereo if requested

[patch] [PATCH 03] dtsdec: downmix to mono or stereo if requested

0003-dtsdec-downmix-to-mono-or-stereo-if-requested.patch (text/plain), 1.24 KB, created by Sergey Vlasov on 2007-05-15 14:57:56 MSD

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Creator: Sergey Vlasov

Created: 2007-05-15 14:57:56 MSD

Size: 1.24 KB

patch

obsolete

>From eff8b4beda14d97d253dcea1cbd962b356c5e01a Mon Sep 17 00:00:00 2001
>From: Sergey Vlasov <vsu@altlinux.ru>
>Date: Tue, 15 May 2007 14:50:42 +0400
>Subject: dtsdec: downmix to mono or stereo if requested
>
>If avctx->channels is set to 1 or 2, ask libdts to downmix sound to
>the requested number of channels instead of returning all channels.
>This matches the AC3 decoder behavior and assumptions made by ffplay
>and ffmpeg programs.
>
>Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
>---
> libavcodec/dtsdec.c |   10 +++++++++-
> 1 files changed, 9 insertions(+), 1 deletions(-)
>
>diff --git a/libavcodec/dtsdec.c b/libavcodec/dtsdec.c
>index 17ba86f..ac2e9a1 100644
>--- a/libavcodec/dtsdec.c
>+++ b/libavcodec/dtsdec.c
>@@ -216,7 +216,15 @@ dts_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
>     level = CONVERT_LEVEL;
>     bias = CONVERT_BIAS;
> 
>-    flags = s->flags | DTS_ADJUST_LEVEL;
>+    if(avctx->channels == 1) {
>+        flags = DTS_MONO;
>+    } else if(avctx->channels == 2) {
>+        flags = DTS_STEREO;
>+    } else {
>+        flags = s->flags;
>+    }
>+
>+    flags |= DTS_ADJUST_LEVEL;
>     if(dts_frame(s->state, s->buf, &flags, &level, bias)) {
>         av_log(avctx, AV_LOG_ERROR, "dts_frame() failed\n");
>         goto end;
>-- 
>1.5.1.1.197.g66b3
>

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