| /* |
| * Yamaha SMAF format |
| * Copyright (c) 2005 Vidar Madsen |
| * |
| * 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/channel_layout.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "internal.h" |
| #include "pcm.h" |
| #include "rawenc.h" |
| #include "riff.h" |
| |
| typedef struct MMFContext { |
| int64_t atrpos, atsqpos, awapos; |
| int64_t data_end; |
| int stereo; |
| } MMFContext; |
| |
| static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 }; |
| |
| static int mmf_rate(int code) |
| { |
| if ((code < 0) || (code > 4)) |
| return -1; |
| return mmf_rates[code]; |
| } |
| |
| #if CONFIG_MMF_MUXER |
| static int mmf_rate_code(int rate) |
| { |
| int i; |
| for (i = 0; i < 5; i++) |
| if (mmf_rates[i] == rate) |
| return i; |
| return -1; |
| } |
| |
| /* Copy of end_tag() from avienc.c, but for big-endian chunk size */ |
| static void end_tag_be(AVIOContext *pb, int64_t start) |
| { |
| int64_t pos; |
| |
| pos = avio_tell(pb); |
| avio_seek(pb, start - 4, SEEK_SET); |
| avio_wb32(pb, (uint32_t)(pos - start)); |
| avio_seek(pb, pos, SEEK_SET); |
| } |
| |
| static int mmf_write_header(AVFormatContext *s) |
| { |
| MMFContext *mmf = s->priv_data; |
| AVIOContext *pb = s->pb; |
| int64_t pos; |
| int rate; |
| const char *version = s->flags & AVFMT_FLAG_BITEXACT ? |
| "VN:Lavf," : |
| "VN:"LIBAVFORMAT_IDENT","; |
| |
| rate = mmf_rate_code(s->streams[0]->codecpar->sample_rate); |
| if (rate < 0) { |
| av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n", |
| s->streams[0]->codecpar->sample_rate); |
| return AVERROR(EINVAL); |
| } |
| |
| mmf->stereo = s->streams[0]->codecpar->channels > 1; |
| if (mmf->stereo && |
| s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) { |
| av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, " |
| "add '-strict %d' if you want to use it.\n", |
| FF_COMPLIANCE_EXPERIMENTAL); |
| return AVERROR(EINVAL); |
| } |
| |
| ffio_wfourcc(pb, "MMMD"); |
| avio_wb32(pb, 0); |
| pos = ff_start_tag(pb, "CNTI"); |
| avio_w8(pb, 0); /* class */ |
| avio_w8(pb, 1); /* type */ |
| avio_w8(pb, 1); /* code type */ |
| avio_w8(pb, 0); /* status */ |
| avio_w8(pb, 0); /* counts */ |
| end_tag_be(pb, pos); |
| |
| pos = ff_start_tag(pb, "OPDA"); |
| avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */ |
| end_tag_be(pb, pos); |
| |
| avio_write(pb, "ATR\x00", 4); |
| avio_wb32(pb, 0); |
| mmf->atrpos = avio_tell(pb); |
| avio_w8(pb, 0); /* format type */ |
| avio_w8(pb, 0); /* sequence type */ |
| avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */ |
| avio_w8(pb, 0); /* wave base bit */ |
| avio_w8(pb, 2); /* time base d */ |
| avio_w8(pb, 2); /* time base g */ |
| |
| ffio_wfourcc(pb, "Atsq"); |
| avio_wb32(pb, 16); |
| mmf->atsqpos = avio_tell(pb); |
| /* Will be filled on close */ |
| avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); |
| |
| mmf->awapos = ff_start_tag(pb, "Awa\x01"); |
| |
| avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate); |
| |
| return 0; |
| } |
| |
| /* Write a variable-length symbol */ |
| static void put_varlength(AVIOContext *pb, int val) |
| { |
| if (val < 128) |
| avio_w8(pb, val); |
| else { |
| val -= 128; |
| avio_w8(pb, 0x80 | val >> 7); |
| avio_w8(pb, 0x7f & val); |
| } |
| } |
| |
| static int mmf_write_trailer(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| MMFContext *mmf = s->priv_data; |
| int64_t pos, size; |
| int gatetime; |
| |
| if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) { |
| /* Fill in length fields */ |
| end_tag_be(pb, mmf->awapos); |
| end_tag_be(pb, mmf->atrpos); |
| end_tag_be(pb, 8); |
| |
| pos = avio_tell(pb); |
| size = pos - mmf->awapos; |
| |
| /* Fill Atsq chunk */ |
| avio_seek(pb, mmf->atsqpos, SEEK_SET); |
| |
| /* "play wav" */ |
| avio_w8(pb, 0); /* start time */ |
| avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */ |
| gatetime = size * 500 / s->streams[0]->codecpar->sample_rate; |
| put_varlength(pb, gatetime); /* duration */ |
| |
| /* "nop" */ |
| put_varlength(pb, gatetime); /* start time */ |
| avio_write(pb, "\xff\x00", 2); /* nop */ |
| |
| /* "end of sequence" */ |
| avio_write(pb, "\x00\x00\x00\x00", 4); |
| |
| avio_seek(pb, pos, SEEK_SET); |
| } |
| return 0; |
| } |
| #endif /* CONFIG_MMF_MUXER */ |
| |
| static int mmf_probe(const AVProbeData *p) |
| { |
| /* check file header */ |
| if (p->buf[0] == 'M' && p->buf[1] == 'M' && |
| p->buf[2] == 'M' && p->buf[3] == 'D' && |
| p->buf[8] == 'C' && p->buf[9] == 'N' && |
| p->buf[10] == 'T' && p->buf[11] == 'I') |
| return AVPROBE_SCORE_MAX; |
| else |
| return 0; |
| } |
| |
| /* mmf input */ |
| static int mmf_read_header(AVFormatContext *s) |
| { |
| MMFContext *mmf = s->priv_data; |
| unsigned int tag; |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| int64_t size; |
| int rate, params; |
| |
| tag = avio_rl32(pb); |
| if (tag != MKTAG('M', 'M', 'M', 'D')) |
| return AVERROR_INVALIDDATA; |
| avio_skip(pb, 4); /* file_size */ |
| |
| /* Skip some unused chunks that may or may not be present */ |
| for (;; avio_skip(pb, size)) { |
| tag = avio_rl32(pb); |
| size = avio_rb32(pb); |
| if (tag == MKTAG('C', 'N', 'T', 'I')) |
| continue; |
| if (tag == MKTAG('O', 'P', 'D', 'A')) |
| continue; |
| break; |
| } |
| |
| /* Tag = "ATRx", where "x" = track number */ |
| if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) { |
| av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n"); |
| return AVERROR_PATCHWELCOME; |
| } |
| if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) { |
| av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| avio_r8(pb); /* format type */ |
| avio_r8(pb); /* sequence type */ |
| params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */ |
| rate = mmf_rate(params & 0x0f); |
| if (rate < 0) { |
| av_log(s, AV_LOG_ERROR, "Invalid sample rate\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| avio_r8(pb); /* wave base bit */ |
| avio_r8(pb); /* time base d */ |
| avio_r8(pb); /* time base g */ |
| |
| /* Skip some unused chunks that may or may not be present */ |
| for (;; avio_skip(pb, size)) { |
| tag = avio_rl32(pb); |
| size = avio_rb32(pb); |
| if (tag == MKTAG('A', 't', 's', 'q')) |
| continue; |
| if (tag == MKTAG('A', 's', 'p', 'I')) |
| continue; |
| break; |
| } |
| |
| /* Make sure it's followed by an Awa chunk, aka wave data */ |
| if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) { |
| av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag); |
| return AVERROR_INVALIDDATA; |
| } |
| mmf->data_end = avio_tell(pb) + size; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = AV_CODEC_ID_ADPCM_YAMAHA; |
| st->codecpar->sample_rate = rate; |
| st->codecpar->channels = (params >> 7) + 1; |
| st->codecpar->channel_layout = params >> 7 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; |
| st->codecpar->bits_per_coded_sample = 4; |
| st->codecpar->bit_rate = st->codecpar->sample_rate * |
| st->codecpar->bits_per_coded_sample; |
| |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| return 0; |
| } |
| |
| #define MAX_SIZE 4096 |
| |
| static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| MMFContext *mmf = s->priv_data; |
| int64_t left, size; |
| int ret; |
| |
| left = mmf->data_end - avio_tell(s->pb); |
| size = FFMIN(left, MAX_SIZE); |
| if (avio_feof(s->pb) || size <= 0) |
| return AVERROR_EOF; |
| |
| ret = av_get_packet(s->pb, pkt, size); |
| if (ret < 0) |
| return ret; |
| |
| pkt->stream_index = 0; |
| |
| return ret; |
| } |
| |
| #if CONFIG_MMF_DEMUXER |
| AVInputFormat ff_mmf_demuxer = { |
| .name = "mmf", |
| .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"), |
| .priv_data_size = sizeof(MMFContext), |
| .read_probe = mmf_probe, |
| .read_header = mmf_read_header, |
| .read_packet = mmf_read_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |
| #endif |
| |
| #if CONFIG_MMF_MUXER |
| AVOutputFormat ff_mmf_muxer = { |
| .name = "mmf", |
| .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"), |
| .mime_type = "application/vnd.smaf", |
| .extensions = "mmf", |
| .priv_data_size = sizeof(MMFContext), |
| .audio_codec = AV_CODEC_ID_ADPCM_YAMAHA, |
| .video_codec = AV_CODEC_ID_NONE, |
| .write_header = mmf_write_header, |
| .write_packet = ff_raw_write_packet, |
| .write_trailer = mmf_write_trailer, |
| }; |
| #endif |