| /* |
| * 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 |
| */ |
| |
| /** |
| * SoX native format demuxer |
| * @file |
| * @author Daniel Verkamp |
| * @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/dict.h" |
| #include "avformat.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, |
| AVFormatParameters *ap) |
| { |
| AVIOContext *pb = s->pb; |
| unsigned header_size, comment_size; |
| double sample_rate, sample_rate_frac; |
| AVStream *st; |
| |
| st = av_new_stream(s, 0); |
| 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_int2dbl(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_int2dbl(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 (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; |
| |
| av_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->stream_index = 0; |
| pkt->size = ret; |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_sox_demuxer = { |
| "sox", |
| NULL_IF_CONFIG_SMALL("SoX native format"), |
| 0, |
| sox_probe, |
| sox_read_header, |
| sox_read_packet, |
| NULL, |
| pcm_read_seek, |
| }; |