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remove unneeded variables from AC3HeaderInfo

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Originally committed as revision 11419 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles
2008-01-05 17:04:57 +00:00
parent 3eca1e6fad
commit 86ad4c7e1b
3 changed files with 11 additions and 17 deletions
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17
libavcodec/ac3_parser.c
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@@ -37,6 +37,7 @@ static const uint8_t eac3_blocks[4] = {
int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr)
{
GetBitContext gbc;
int frame_size_code;
memset(hdr, 0, sizeof(*hdr));
@@ -56,30 +57,30 @@ int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr)
if(hdr->sr_code == 3)
return AC3_PARSE_ERROR_SAMPLE_RATE;
hdr->frame_size_code = get_bits(&gbc, 6);
if(hdr->frame_size_code > 37)
frame_size_code = get_bits(&gbc, 6);
if(frame_size_code > 37)
return AC3_PARSE_ERROR_FRAME_SIZE;
skip_bits(&gbc, 5); // skip bsid, already got it
hdr->bitstream_mode = get_bits(&gbc, 3);
skip_bits(&gbc, 3); // skip bitstream mode
hdr->channel_mode = get_bits(&gbc, 3);
if((hdr->channel_mode & 1) && hdr->channel_mode != AC3_CHMODE_MONO) {
hdr->center_mix_level = get_bits(&gbc, 2);
skip_bits(&gbc, 2); // skip center mix level
}
if(hdr->channel_mode & 4) {
hdr->surround_mix_level = get_bits(&gbc, 2);
skip_bits(&gbc, 2); // skip surround mix level
}
if(hdr->channel_mode == AC3_CHMODE_STEREO) {
hdr->dolby_surround_mode = get_bits(&gbc, 2);
skip_bits(&gbc, 2); // skip dolby surround mode
}
hdr->lfe_on = get_bits1(&gbc);
hdr->sr_shift = FFMAX(hdr->bitstream_id, 8) - 8;
hdr->sample_rate = ff_ac3_sample_rate_tab[hdr->sr_code] >> hdr->sr_shift;
hdr->bit_rate = (ff_ac3_bitrate_tab[hdr->frame_size_code>>1] * 1000) >> hdr->sr_shift;
hdr->bit_rate = (ff_ac3_bitrate_tab[frame_size_code>>1] * 1000) >> hdr->sr_shift;
hdr->channels = ff_ac3_channels_tab[hdr->channel_mode] + hdr->lfe_on;
hdr->frame_size = ff_ac3_frame_size_tab[hdr->frame_size_code][hdr->sr_code] * 2;
hdr->frame_size = ff_ac3_frame_size_tab[frame_size_code][hdr->sr_code] * 2;
return 0;
}