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flacdec: comments and white space.

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move skipping of frame header to decode_frame()

Originally committed as revision 18150 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2009-03-22 19:12:02 +00:00
parent d1d9945f1a
commit 4285c2923c
1 changed files with 12 additions and 3 deletions
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15
libavcodec/flacdec.c
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@ -486,11 +486,15 @@ static int decode_frame(FLACContext *s, int alloc_data_size)
int ch_mode, bps, blocksize, samplerate;
GetBitContext *gb = &s->gb;
bs_code = get_bits(gb, 4);
/* frame sync code */
skip_bits(&s->gb, 16);
/* block size and sample rate codes */
bs_code = get_bits(gb, 4);
sr_code = get_bits(gb, 4);
ch_mode = get_bits(gb, 4); /* channel assignment */
/* channels and decorrelation */
ch_mode = get_bits(gb, 4);
if (ch_mode < FLAC_MAX_CHANNELS && s->channels == ch_mode+1) {
ch_mode = FLAC_CHMODE_INDEPENDENT;
} else if (ch_mode > FLAC_CHMODE_MID_SIDE || s->channels != 2) {
@ -499,6 +503,7 @@ static int decode_frame(FLACContext *s, int alloc_data_size)
return -1;
}
/* bits per sample */
bps_code = get_bits(gb, 3);
if (bps_code == 0)
bps= s->bps;
@ -520,16 +525,19 @@ static int decode_frame(FLACContext *s, int alloc_data_size)
}
s->bps = s->avctx->bits_per_raw_sample = bps;
/* reserved bit */
if (get_bits1(gb)) {
av_log(s->avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
return -1;
}
/* sample or frame count */
if (get_utf8(gb) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
return -1;
}
/* blocksize */
if (bs_code == 0) {
av_log(s->avctx, AV_LOG_ERROR, "reserved blocksize code: 0\n");
return -1;
@ -549,6 +557,7 @@ static int decode_frame(FLACContext *s, int alloc_data_size)
if (blocksize * s->channels * (s->is32 ? 4 : 2) > alloc_data_size)
return -1;
/* sample rate */
if (sr_code == 0)
samplerate= s->samplerate;
else if (sr_code < 12)
@ -565,6 +574,7 @@ static int decode_frame(FLACContext *s, int alloc_data_size)
return -1;
}
/* header CRC-8 check */
skip_bits(gb, 8);
if (av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, gb->buffer,
get_bits_count(gb)/8)) {
@ -665,7 +675,6 @@ static int flac_decode_frame(AVCodecContext *avctx,
/* decode frame */
init_get_bits(&s->gb, buf, buf_size*8);
skip_bits(&s->gb, 16);
if (decode_frame(s, alloc_data_size) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
s->bitstream_size=0;