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n3.4.14
libavformat/fsb.c
210 строк
6 KB
Derek Buitenhuis
Merge commit '9200514ad8717c63f82101dc394f4378854325bf'
10 апр 2016, 22:59
10 апр 2016, 22:59
6f69f7a
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/* * FSB demuxer * Copyright (c) 2015 Paul B Mahol * * 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/avassert.h" #include "libavutil/intreadwrite.h" #include "avformat.h" #include "avio.h" #include "internal.h" static int fsb_probe(AVProbeData *p) { if (memcmp(p->buf, "FSB", 3) || p->buf[3] - '0' < 1 || p->buf[3] - '0' > 5) return 0; if (AV_RL32(p->buf + 4) != 1) return 0; return AVPROBE_SCORE_MAX; } static int fsb_read_header(AVFormatContext *s) { AVIOContext *pb = s->pb; unsigned format, version, c; int64_t offset; AVCodecParameters *par; AVStream *st = avformat_new_stream(s, NULL); avio_skip(pb, 3); // "FSB" version = avio_r8(pb) - '0'; if (version != 4 && version != 3) { avpriv_request_sample(s, "version %d", version); return AVERROR_PATCHWELCOME; } avio_skip(pb, 4); if (!st) return AVERROR(ENOMEM); par = st->codecpar; par->codec_type = AVMEDIA_TYPE_AUDIO; par->codec_tag = 0; if (version == 3) { offset = avio_rl32(pb) + 0x18; avio_skip(pb, 44); st->duration = avio_rl32(pb); avio_skip(pb, 12); format = avio_rl32(pb); par->sample_rate = avio_rl32(pb); if (par->sample_rate <= 0) return AVERROR_INVALIDDATA; avio_skip(pb, 6); par->channels = avio_rl16(pb); if (!par->channels) return AVERROR_INVALIDDATA; if (format & 0x00000100) { par->codec_id = AV_CODEC_ID_PCM_S16LE; par->block_align = 4096 * par->channels; } else if (format & 0x00400000) { par->bits_per_coded_sample = 4; par->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; par->block_align = 36 * par->channels; } else if (format & 0x00800000) { par->codec_id = AV_CODEC_ID_ADPCM_PSX; par->block_align = 16 * par->channels; } else if (format & 0x02000000) { par->codec_id = AV_CODEC_ID_ADPCM_THP; par->block_align = 8 * par->channels; if (par->channels > INT_MAX / 32) return AVERROR_INVALIDDATA; ff_alloc_extradata(par, 32 * par->channels); if (!par->extradata) return AVERROR(ENOMEM); avio_seek(pb, 0x68, SEEK_SET); for (c = 0; c < par->channels; c++) { avio_read(pb, par->extradata + 32 * c, 32); avio_skip(pb, 14); } } else { avpriv_request_sample(s, "format 0x%X", format); return AVERROR_PATCHWELCOME; } } else if (version == 4) { offset = avio_rl32(pb) + 0x30; avio_skip(pb, 80); st->duration = avio_rl32(pb); format = avio_rb32(pb); switch(format) { case 0x40001001: case 0x00001005: case 0x40001081: case 0x40200001: par->codec_id = AV_CODEC_ID_XMA2; break; case 0x40000802: par->codec_id = AV_CODEC_ID_ADPCM_THP; break; default: avpriv_request_sample(s, "format 0x%X", format); return AVERROR_PATCHWELCOME; } par->sample_rate = avio_rl32(pb); if (par->sample_rate <= 0) return AVERROR_INVALIDDATA; avio_skip(pb, 6); par->channels = avio_rl16(pb); if (!par->channels) return AVERROR_INVALIDDATA; switch (par->codec_id) { case AV_CODEC_ID_XMA2: ff_alloc_extradata(par, 34); if (!par->extradata) return AVERROR(ENOMEM); memset(par->extradata, 0, 34); par->block_align = 2048; break; case AV_CODEC_ID_ADPCM_THP: if (par->channels > INT_MAX / 32) return AVERROR_INVALIDDATA; ff_alloc_extradata(par, 32 * par->channels); if (!par->extradata) return AVERROR(ENOMEM); avio_seek(pb, 0x80, SEEK_SET); for (c = 0; c < par->channels; c++) { avio_read(pb, par->extradata + 32 * c, 32); avio_skip(pb, 14); } par->block_align = 8 * par->channels; break; } } else { av_assert0(0); } avio_skip(pb, offset - avio_tell(pb)); s->internal->data_offset = avio_tell(pb); avpriv_set_pts_info(st, 64, 1, par->sample_rate); return 0; } static int fsb_read_packet(AVFormatContext *s, AVPacket *pkt) { AVCodecParameters *par = s->streams[0]->codecpar; int64_t pos; int ret; if (avio_feof(s->pb)) return AVERROR_EOF; pos = avio_tell(s->pb); if (par->codec_id == AV_CODEC_ID_ADPCM_THP && par->channels > 1) { int i, ch; ret = av_new_packet(pkt, par->block_align); if (ret < 0) return ret; for (i = 0; i < 4; i++) { for (ch = 0; ch < par->channels; ch++) { pkt->data[ch * 8 + i * 2 + 0] = avio_r8(s->pb); pkt->data[ch * 8 + i * 2 + 1] = avio_r8(s->pb); } } ret = 0; } else { ret = av_get_packet(s->pb, pkt, par->block_align); } if (par->codec_id == AV_CODEC_ID_XMA2 && pkt->size >= 1) pkt->duration = (pkt->data[0] >> 2) * 512; pkt->pos = pos; pkt->stream_index = 0; return ret; } AVInputFormat ff_fsb_demuxer = { .name = "fsb", .long_name = NULL_IF_CONFIG_SMALL("FMOD Sample Bank"), .read_probe = fsb_probe, .read_header = fsb_read_header, .read_packet = fsb_read_packet, .extensions = "fsb", .flags = AVFMT_GENERIC_INDEX, };