/* * SoX native format demuxer * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu> * * Based on libSoX sox-fmt.c * Copyright (c) 2008 robs@users.sourceforge.net * * 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 */ /** * @file * SoX native format demuxer * @author Daniel Verkamp * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format */ #include "libavutil/intreadwrite.h" #include "libavutil/intfloat.h" #include "libavutil/dict.h" #include "avformat.h" #include "internal.h" #include "pcm.h" #include "sox.h" static int sox_probe(AVProbeData *p) { if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG) return AVPROBE_SCORE_MAX; return 0; } static int sox_read_header(AVFormatContext *s) { AVIOContext *pb = s->pb; unsigned header_size, comment_size; double sample_rate, sample_rate_frac; AVStream *st; st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; if (avio_rl32(pb) == SOX_TAG) { st->codec->codec_id = CODEC_ID_PCM_S32LE; header_size = avio_rl32(pb); avio_skip(pb, 8); /* sample count */ sample_rate = av_int2double(avio_rl64(pb)); st->codec->channels = avio_rl32(pb); comment_size = avio_rl32(pb); } else { st->codec->codec_id = CODEC_ID_PCM_S32BE; header_size = avio_rb32(pb); avio_skip(pb, 8); /* sample count */ sample_rate = av_int2double(avio_rb64(pb)); st->codec->channels = avio_rb32(pb); comment_size = avio_rb32(pb); } if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) { av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size); return -1; } if (sample_rate <= 0 || sample_rate > INT_MAX) { av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate); return -1; } sample_rate_frac = sample_rate - floor(sample_rate); if (sample_rate_frac) av_log(s, AV_LOG_WARNING, "truncating fractional part of sample rate (%f)\n", sample_rate_frac); if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size || st->codec->channels > 65535) /* Reserve top 16 bits */ { av_log(s, AV_LOG_ERROR, "invalid header\n"); return -1; } if (comment_size && comment_size < UINT_MAX) { char *comment = av_malloc(comment_size+1); if(!comment) return AVERROR(ENOMEM); if (avio_read(pb, comment, comment_size) != comment_size) { av_freep(&comment); return AVERROR(EIO); } comment[comment_size] = 0; av_dict_set(&s->metadata, "comment", comment, AV_DICT_DONT_STRDUP_VAL); } avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size); st->codec->sample_rate = sample_rate; st->codec->bits_per_coded_sample = 32; st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels; st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); return 0; } #define SOX_SAMPLES 1024 static int sox_read_packet(AVFormatContext *s, AVPacket *pkt) { int ret, size; if (url_feof(s->pb)) return AVERROR_EOF; size = SOX_SAMPLES*s->streams[0]->codec->block_align; ret = av_get_packet(s->pb, pkt, size); if (ret < 0) return AVERROR(EIO); pkt->flags &= ~AV_PKT_FLAG_CORRUPT; pkt->stream_index = 0; return 0; } AVInputFormat ff_sox_demuxer = { .name = "sox", .long_name = NULL_IF_CONFIG_SMALL("SoX native format"), .read_probe = sox_probe, .read_header = sox_read_header, .read_packet = sox_read_packet, .read_seek = ff_pcm_read_seek, };