Make Intel Music Coder output SAMPLE_FMT_FLT

Originally committed as revision 24267 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/imc.c

@@ -87,7 +87,7 @@ typedef struct {
     DSPContext dsp;
     FFTContext fft;
     DECLARE_ALIGNED(16, FFTComplex, samples)[COEFFS/2];
-    DECLARE_ALIGNED(16, float, out_samples)[COEFFS];
+    float *out_samples;
 } IMCContext;
 
 static VLC huffman_vlc[4][4];
@@ -116,8 +116,8 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)
     for(i = 0; i < COEFFS; i++)
         q->mdct_sine_window[i] *= sqrt(2.0);
     for(i = 0; i < COEFFS/2; i++){
-        q->post_cos[i] = cos(i / 256.0 * M_PI);
-        q->post_sin[i] = sin(i / 256.0 * M_PI);
+        q->post_cos[i] = (1.0f / 32768) * cos(i / 256.0 * M_PI);
+        q->post_sin[i] = (1.0f / 32768) * sin(i / 256.0 * M_PI);
 
         r1 = sin((i * 4.0 + 1.0) / 1024.0 * M_PI);
         r2 = cos((i * 4.0 + 1.0) / 1024.0 * M_PI);
@@ -156,7 +156,7 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)
 
     ff_fft_init(&q->fft, 7, 1);
     dsputil_init(&q->dsp, avctx);
-    avctx->sample_fmt = SAMPLE_FMT_S16;
+    avctx->sample_fmt = SAMPLE_FMT_FLT;
     avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
     return 0;
 }
@@ -662,6 +662,7 @@ static int imc_decode_frame(AVCodecContext * avctx,
     for(i = 0; i < IMC_BLOCK_SIZE / 2; i++)
         buf16[i] = av_bswap16(((const uint16_t*)buf)[i]);
 
+    q->out_samples = data;
     init_get_bits(&q->gb, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8);
 
     /* Check the frame header */
@@ -805,9 +806,7 @@ static int imc_decode_frame(AVCodecContext * avctx,
 
     imc_imdct256(q);
 
-    q->dsp.float_to_int16(data, q->out_samples, COEFFS);
-
-    *data_size = COEFFS * sizeof(int16_t);
+    *data_size = COEFFS * sizeof(float);
 
     return IMC_BLOCK_SIZE;
 }