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Move frame len bits calculation to ff_wma_get_frame_len_bits

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so that it can be reused for wmapro

Originally committed as revision 19167 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Sascha Sommer 2009-06-12 15:21:43 +00:00
parent 8e6e9bacc4
commit cee4bb894d
2 changed files with 28 additions and 8 deletions
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34
libavcodec/wma.c
View File

@ -62,6 +62,30 @@ static void init_coef_vlc(VLC *vlc, uint16_t **prun_table,
*pint_table = int_table; *pint_table = int_table;
} }
/**
*@brief Get the samples per frame for this stream.
*@param sample_rate output sample_rate
*@param version wma version
*@param decode_flags codec compression features
*@return log2 of the number of output samples per frame
*/
int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
unsigned int decode_flags)
{
int frame_len_bits;
if (sample_rate <= 16000)
frame_len_bits = 9;
else if (sample_rate <= 22050 ||
(sample_rate <= 32000 && version == 1))
frame_len_bits = 10;
else
frame_len_bits = 11;
return frame_len_bits;
}
int ff_wma_init(AVCodecContext *avctx, int flags2) int ff_wma_init(AVCodecContext *avctx, int flags2)
{ {
WMACodecContext *s = avctx->priv_data; WMACodecContext *s = avctx->priv_data;
@ -90,14 +114,8 @@ int ff_wma_init(AVCodecContext *avctx, int flags2)
} }
/* compute MDCT block size */ /* compute MDCT block size */
if (s->sample_rate <= 16000) { s->frame_len_bits = ff_wma_get_frame_len_bits(s->sample_rate, s->version, 0);
s->frame_len_bits = 9;
} else if ( s->sample_rate <= 22050 ||
(s->sample_rate <= 32000 && s->version == 1)) {
s->frame_len_bits = 10;
} else {
s->frame_len_bits = 11;
}
s->frame_len = 1 << s->frame_len_bits; s->frame_len = 1 << s->frame_len_bits;
if (s->use_variable_block_len) { if (s->use_variable_block_len) {
int nb_max, nb; int nb_max, nb;

2
libavcodec/wma.h
View File

@ -143,6 +143,8 @@ extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
extern const uint32_t ff_wma_scale_huffcodes[121]; extern const uint32_t ff_wma_scale_huffcodes[121];
extern const uint8_t ff_wma_scale_huffbits[121]; extern const uint8_t ff_wma_scale_huffbits[121];
int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
unsigned int decode_flags);
int ff_wma_init(AVCodecContext * avctx, int flags2); int ff_wma_init(AVCodecContext * avctx, int flags2);
int ff_wma_total_gain_to_bits(int total_gain); int ff_wma_total_gain_to_bits(int total_gain);
int ff_wma_end(AVCodecContext *avctx); int ff_wma_end(AVCodecContext *avctx);