nellymoserenc: take float input samples instead of int16

This avoids having to convert all input data from int16 to float, which is used
internally for encoding.

libavcodec/nellymoserenc.c

@@ -146,7 +146,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
 
     avctx->frame_size = NELLY_SAMPLES;
     s->avctx = avctx;
-    ff_mdct_init(&s->mdct_ctx, 8, 0, 1.0);
+    ff_mdct_init(&s->mdct_ctx, 8, 0, 32768.0);
     dsputil_init(&s->dsp, avctx);
 
     /* Generate overlap window */
@@ -352,17 +352,15 @@ static void encode_block(NellyMoserEncodeContext *s, unsigned char *output, int
 static int encode_frame(AVCodecContext *avctx, uint8_t *frame, int buf_size, void *data)
 {
     NellyMoserEncodeContext *s = avctx->priv_data;
-    const int16_t *samples = data;
+    const float *samples = data;
     int i;
 
     if (s->last_frame)
         return 0;
 
     if (data) {
-        for (i = 0; i < avctx->frame_size; i++) {
-            s->buf[s->bufsel][i] = samples[i];
-        }
-        for (; i < NELLY_SAMPLES; i++) {
+        memcpy(s->buf[s->bufsel], samples, avctx->frame_size * sizeof(*samples));
+        for (i = avctx->frame_size; i < NELLY_SAMPLES; i++) {
             s->buf[s->bufsel][i] = 0;
         }
         s->bufsel = 1 - s->bufsel;
@@ -393,5 +391,5 @@ AVCodec ff_nellymoser_encoder = {
     .close = encode_end,
     .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
     .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
-    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
+    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_FLT,AV_SAMPLE_FMT_NONE},
 };