diff options
Diffstat (limited to 'ffmpeg1/libavformat/ac3dec.c')
| -rw-r--r-- | ffmpeg1/libavformat/ac3dec.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/ffmpeg1/libavformat/ac3dec.c b/ffmpeg1/libavformat/ac3dec.c deleted file mode 100644 index c531f8a..0000000 --- a/ffmpeg1/libavformat/ac3dec.c +++ /dev/null @@ -1,123 +0,0 @@ -/* - * RAW AC-3 and E-AC-3 demuxer - * Copyright (c) 2007 Justin Ruggles <justin.ruggles@gmail.com> - * - * This file is part of FFmpeg. - * - * FFmpeg 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. - * - * FFmpeg 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 FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "libavutil/crc.h" -#include "libavcodec/ac3_parser.h" -#include "avformat.h" -#include "rawdec.h" - -static int ac3_eac3_probe(AVProbeData *p, enum AVCodecID expected_codec_id) -{ - int max_frames, first_frames = 0, frames; - const uint8_t *buf, *buf2, *end; - AC3HeaderInfo hdr; - GetBitContext gbc; - enum AVCodecID codec_id = AV_CODEC_ID_AC3; - - max_frames = 0; - buf = p->buf; - end = buf + p->buf_size; - - for(; buf < end; buf++) { - if(buf > p->buf && !(buf[0] == 0x0B && buf[1] == 0x77) - && !(buf[0] == 0x77 && buf[1] == 0x0B) ) - continue; - buf2 = buf; - - for(frames = 0; buf2 < end; frames++) { - uint8_t buf3[4096]; - int i; - if(!memcmp(buf2, "\x1\x10\0\0\0\0\0\0", 8)) - buf2+=16; - if (buf[0] == 0x77 && buf[1] == 0x0B) { - for(i=0; i<8; i+=2) { - buf3[i ] = buf[i+1]; - buf3[i+1] = buf[i ]; - } - init_get_bits(&gbc, buf3, 54); - }else - init_get_bits(&gbc, buf2, 54); - if(avpriv_ac3_parse_header(&gbc, &hdr) < 0) - break; - if(buf2 + hdr.frame_size > end) - break; - if (buf[0] == 0x77 && buf[1] == 0x0B) { - av_assert0(hdr.frame_size <= sizeof(buf3)); - for(i=8; i<hdr.frame_size; i+=2) { - buf3[i ] = buf[i+1]; - buf3[i+1] = buf[i ]; - } - } - if(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, gbc.buffer + 2, hdr.frame_size - 2)) - break; - if (hdr.bitstream_id > 10) - codec_id = AV_CODEC_ID_EAC3; - buf2 += hdr.frame_size; - } - max_frames = FFMAX(max_frames, frames); - if(buf == p->buf) - first_frames = frames; - } - if(codec_id != expected_codec_id) return 0; - // keep this in sync with mp3 probe, both need to avoid - // issues with MPEG-files! - if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1; - else if(max_frames>200)return AVPROBE_SCORE_MAX/2; - else if(max_frames>=4) return AVPROBE_SCORE_MAX/4; - else if(max_frames>=1) return 1; - else return 0; -} - -#if CONFIG_AC3_DEMUXER -static int ac3_probe(AVProbeData *p) -{ - return ac3_eac3_probe(p, AV_CODEC_ID_AC3); -} - -AVInputFormat ff_ac3_demuxer = { - .name = "ac3", - .long_name = NULL_IF_CONFIG_SMALL("raw AC-3"), - .read_probe = ac3_probe, - .read_header = ff_raw_audio_read_header, - .read_packet = ff_raw_read_partial_packet, - .flags= AVFMT_GENERIC_INDEX, - .extensions = "ac3", - .raw_codec_id = AV_CODEC_ID_AC3, -}; -#endif - -#if CONFIG_EAC3_DEMUXER -static int eac3_probe(AVProbeData *p) -{ - return ac3_eac3_probe(p, AV_CODEC_ID_EAC3); -} - -AVInputFormat ff_eac3_demuxer = { - .name = "eac3", - .long_name = NULL_IF_CONFIG_SMALL("raw E-AC-3"), - .read_probe = eac3_probe, - .read_header = ff_raw_audio_read_header, - .read_packet = ff_raw_read_partial_packet, - .flags = AVFMT_GENERIC_INDEX, - .extensions = "eac3", - .raw_codec_id = AV_CODEC_ID_EAC3, -}; -#endif |