av_get_bits_per_sample and due simplifications

Originally committed as revision 5661 to svn://svn.ffmpeg.org/ffmpeg/trunk

2 files changed, 32 insertions, 0 deletions

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 5509621d4b..a829fd6dd1 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2499,6 +2499,10 @@ void avcodec_default_free_buffers(AVCodecContext *s);
  */
 char av_get_pict_type_char(int pict_type);
 
+/**
+ * returns codec bits per sample
+ */
+int av_get_bits_per_sample(enum CodecID codec_id);
 
 /* frame parsing */
 typedef struct AVCodecParserContext {
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 641c680470..b343ba085f 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -1304,6 +1304,34 @@ char av_get_pict_type_char(int pict_type){
     }
 }
 
+int av_get_bits_per_sample(enum CodecID codec_id){
+    switch(codec_id){
+    case CODEC_ID_PCM_ALAW:
+    case CODEC_ID_PCM_MULAW:
+    case CODEC_ID_PCM_S8:
+    case CODEC_ID_PCM_U8:
+        return 8;
+    case CODEC_ID_PCM_S16BE:
+    case CODEC_ID_PCM_S16LE:
+    case CODEC_ID_PCM_U16BE:
+    case CODEC_ID_PCM_U16LE:
+        return 16;
+    case CODEC_ID_PCM_S24DAUD:
+    case CODEC_ID_PCM_S24BE:
+    case CODEC_ID_PCM_S24LE:
+    case CODEC_ID_PCM_U24BE:
+    case CODEC_ID_PCM_U24LE:
+        return 24;
+    case CODEC_ID_PCM_S32BE:
+    case CODEC_ID_PCM_S32LE:
+    case CODEC_ID_PCM_U32BE:
+    case CODEC_ID_PCM_U32LE:
+        return 32;
+    default:
+        return 0;
+    }
+}
+
 /* av_log API */
 
 static int av_log_level = AV_LOG_INFO;