diff options
author | Anton Khirnov <anton@khirnov.net> | 2013-11-24 14:14:13 +0100 |
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committer | Anton Khirnov <anton@khirnov.net> | 2013-11-26 09:27:50 +0100 |
commit | c6080d89009056530119ab794ad02e4d515c7754 (patch) | |
tree | 0f761883cbef7b618c08692397fcf7816d88a34a /libavcodec/mp3_header_decompress_bsf.c | |
parent | 1eaac1d6f7bb8e52d82e1a114c88a59a9a8e5025 (diff) |
lavc: remove mp3_header_(de)compress bitstream filters
They mangle the mp3 header in a non-standard way to save a few bytes.
People who care about space so much should just use a more efficient
codec.
Diffstat (limited to 'libavcodec/mp3_header_decompress_bsf.c')
-rw-r--r-- | libavcodec/mp3_header_decompress_bsf.c | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/libavcodec/mp3_header_decompress_bsf.c b/libavcodec/mp3_header_decompress_bsf.c deleted file mode 100644 index 8e086a1192..0000000000 --- a/libavcodec/mp3_header_decompress_bsf.c +++ /dev/null @@ -1,98 +0,0 @@ -/* - * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> - * - * This file is part of Libav. - * - * Libav is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * Libav is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "libavutil/common.h" -#include "libavutil/intreadwrite.h" -#include "avcodec.h" -#include "mpegaudiodecheader.h" -#include "mpegaudiodata.h" - - -static int mp3_header_decompress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, - uint8_t **poutbuf, int *poutbuf_size, - const uint8_t *buf, int buf_size, int keyframe){ - uint32_t header; - int sample_rate= avctx->sample_rate; - int sample_rate_index=0; - int lsf, mpeg25, bitrate_index, frame_size; - - header = AV_RB32(buf); - if(ff_mpa_check_header(header) >= 0){ - *poutbuf= (uint8_t *) buf; - *poutbuf_size= buf_size; - - return 0; - } - - if(avctx->extradata_size != 15 || strcmp(avctx->extradata, "FFCMP3 0.0")){ - av_log(avctx, AV_LOG_ERROR, "Extradata invalid %d\n", avctx->extradata_size); - return -1; - } - - header= AV_RB32(avctx->extradata+11) & MP3_MASK; - - lsf = sample_rate < (24000+32000)/2; - mpeg25 = sample_rate < (12000+16000)/2; - sample_rate_index= (header>>10)&3; - sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off - - for(bitrate_index=2; bitrate_index<30; bitrate_index++){ - frame_size = avpriv_mpa_bitrate_tab[lsf][2][bitrate_index>>1]; - frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); - if(frame_size == buf_size + 4) - break; - if(frame_size == buf_size + 6) - break; - } - if(bitrate_index == 30){ - av_log(avctx, AV_LOG_ERROR, "Could not find bitrate_index.\n"); - return -1; - } - - header |= (bitrate_index&1)<<9; - header |= (bitrate_index>>1)<<12; - header |= (frame_size == buf_size + 4)<<16; //FIXME actually set a correct crc instead of 0 - - *poutbuf_size= frame_size; - *poutbuf= av_malloc(frame_size + FF_INPUT_BUFFER_PADDING_SIZE); - memcpy(*poutbuf + frame_size - buf_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); - - if(avctx->channels==2){ - uint8_t *p= *poutbuf + frame_size - buf_size; - if(lsf){ - FFSWAP(int, p[1], p[2]); - header |= (p[1] & 0xC0)>>2; - p[1] &= 0x3F; - }else{ - header |= p[1] & 0x30; - p[1] &= 0xCF; - } - } - - AV_WB32(*poutbuf, header); - - return 1; -} - -AVBitStreamFilter ff_mp3_header_decompress_bsf={ - "mp3decomp", - 0, - mp3_header_decompress, -}; |