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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2012-10-18 22:56:10 -0400 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2012-10-22 10:10:08 -0400 |
| commit | 78edce3f1973cf8d611e0408b8d3681038828cfc (patch) | |
| tree | 67f485f670e7d6b0d9b38541d59ad3d4e97425e9 /libavcodec/atrac3.c | |
| parent | c51311b907e0397866748d6af14b160d96c4673b (diff) | |
| download | ffmpeg-78edce3f1973cf8d611e0408b8d3681038828cfc.tar.gz | |
atrac3: separate window initialization from IMDCT initialization
Diffstat (limited to 'libavcodec/atrac3.c')
| -rw-r--r-- | libavcodec/atrac3.c | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c index 21403d293c..69b42fd07d 100644 --- a/libavcodec/atrac3.c +++ b/libavcodec/atrac3.c @@ -174,7 +174,7 @@ static int decode_bytes(const uint8_t *input, uint8_t *out, int bytes) return off; } -static av_cold int init_atrac3_transforms(ATRAC3Context *q) +static av_cold void init_atrac3_window(void) { float enc_window[256]; int i; @@ -184,17 +184,12 @@ static av_cold int init_atrac3_transforms(ATRAC3Context *q) for (i = 0; i < 256; i++) enc_window[i] = (sin(((i + 0.5) / 256.0 - 0.5) * M_PI) + 1.0) * 0.5; - if (!mdct_window[0]) { - for (i = 0; i < 256; i++) { - mdct_window[i] = enc_window[i] / - (enc_window[ i] * enc_window[ i] + - enc_window[255 - i] * enc_window[255 - i]); - mdct_window[511 - i] = mdct_window[i]; - } + for (i = 0; i < 256; i++) { + mdct_window[i] = enc_window[i] / + (enc_window[ i] * enc_window[ i] + + enc_window[255 - i] * enc_window[255 - i]); + mdct_window[511 - i] = mdct_window[i]; } - - /* initialize the MDCT transform */ - return ff_mdct_init(&q->mdct_ctx, 9, 1, 1.0 / 32768); } static av_cold int atrac3_decode_close(AVCodecContext *avctx) @@ -956,12 +951,14 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx) avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; - if ((ret = init_atrac3_transforms(q))) { + /* initialize the MDCT transform */ + if ((ret = ff_mdct_init(&q->mdct_ctx, 9, 1, 1.0 / 32768)) < 0) { av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n"); av_freep(&q->decoded_bytes_buffer); return ret; } + init_atrac3_window(); ff_atrac_generate_tables(); /* Generate gain tables */ |