mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/208/merge
Peter Ross
9 years ago
committed by
Paul B Mahol
parent
a2810d03b9
commit
10d48c63b2
5 changed files with 177 additions and 2 deletions
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/*
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* Wideband Single-bit Data (WSD) demuxer |
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* Copyright (c) 2014 Peter Ross |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/timecode.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "rawdec.h" |
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static int wsd_probe(AVProbeData *p) |
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{ |
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if (p->buf_size < 45 || memcmp(p->buf, "1bit", 4) || |
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!AV_RB32(p->buf + 36) || !p->buf[44] || |
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(p->buf[0] >= 0x10 && (AV_RB32(p->buf + 20) < 0x80 || AV_RB32(p->buf + 24) < 0x80))) |
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return 0; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int empty_string(const char *buf, unsigned size) |
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{ |
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while (size--) { |
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if (*buf++ != ' ') |
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return 0; |
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} |
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return 1; |
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} |
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static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit) |
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{ |
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switch (bit) { |
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case 2: return AV_CH_BACK_RIGHT; |
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case 3: |
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avpriv_request_sample(s, "Rr-middle"); |
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break; |
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case 4: return AV_CH_BACK_CENTER; |
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case 5: |
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avpriv_request_sample(s, "Lr-middle"); |
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break; |
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case 6: return AV_CH_BACK_LEFT; |
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case 24: return AV_CH_LOW_FREQUENCY; |
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case 26: return AV_CH_FRONT_RIGHT; |
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case 27: return AV_CH_FRONT_RIGHT_OF_CENTER; |
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case 28: return AV_CH_FRONT_CENTER; |
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case 29: return AV_CH_FRONT_LEFT_OF_CENTER; |
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case 30: return AV_CH_FRONT_LEFT; |
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default: |
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av_log(s, AV_LOG_WARNING, "reserved channel assignment\n"); |
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break; |
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} |
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return 0; |
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} |
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static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size) |
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{ |
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uint8_t *buf; |
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if (!(size + 1)) |
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return AVERROR(ENOMEM); |
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buf = av_malloc(size + 1); |
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if (!buf) |
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return AVERROR(ENOMEM); |
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if (avio_read(s->pb, buf, size) != size) { |
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av_free(buf); |
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return AVERROR(EIO); |
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} |
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if (empty_string(buf, size)) { |
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av_free(buf); |
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return 0; |
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} |
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buf[size] = 0; |
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av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL); |
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return 0; |
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} |
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static int wsd_read_header(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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AVStream *st; |
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int version; |
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uint32_t text_offset, data_offset, channel_assign; |
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char playback_time[AV_TIMECODE_STR_SIZE]; |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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avio_skip(pb, 8); |
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version = avio_r8(pb); |
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av_log(s, AV_LOG_DEBUG, "version: %i.%i\n", version >> 4, version & 0xF); |
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avio_skip(pb, 11); |
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if (version < 0x10) { |
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text_offset = 0x80; |
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data_offset = 0x800; |
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avio_skip(pb, 8); |
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} else { |
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text_offset = avio_rb32(pb); |
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data_offset = avio_rb32(pb); |
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} |
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avio_skip(pb, 4); |
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av_timecode_make_smpte_tc_string(playback_time, avio_rb32(pb), 0); |
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av_dict_set(&s->metadata, "playback_time", playback_time, 0); |
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->codec_id = s->iformat->raw_codec_id; |
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st->codecpar->sample_rate = avio_rb32(pb) / 8; |
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avio_skip(pb, 4); |
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st->codecpar->channels = avio_r8(pb) & 0xF; |
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if (!st->codecpar->channels) |
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return AVERROR_INVALIDDATA; |
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avio_skip(pb, 3); |
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channel_assign = avio_rb32(pb); |
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if (!(channel_assign & 1)) { |
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int i; |
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for (i = 1; i < 32; i++) |
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if (channel_assign & (1 << i)) |
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st->codecpar->channel_layout |= wsd_to_av_channel_layoyt(s, i); |
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} |
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avio_skip(pb, 16); |
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if (avio_rb32(pb)) |
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avpriv_request_sample(s, "emphasis"); |
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if (avio_seek(pb, text_offset, SEEK_SET) >= 0) { |
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get_metadata(s, "title", 128); |
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get_metadata(s, "composer", 128); |
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get_metadata(s, "song_writer", 128); |
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get_metadata(s, "artist", 128); |
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get_metadata(s, "album", 128); |
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get_metadata(s, "genre", 32); |
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get_metadata(s, "date", 32); |
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get_metadata(s, "location", 32); |
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get_metadata(s, "comment", 512); |
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get_metadata(s, "user", 512); |
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} |
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return avio_seek(pb, data_offset, SEEK_SET); |
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} |
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AVInputFormat ff_wsd_demuxer = { |
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.name = "wsd", |
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.long_name = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"), |
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.read_probe = wsd_probe, |
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.read_header = wsd_read_header, |
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.read_packet = ff_raw_read_partial_packet, |
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.extensions = "wsd", |
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK, |
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.raw_codec_id = AV_CODEC_ID_DSD_MSBF, |
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}; |
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