| /* |
| * 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 "avformat.h" |
| #include "raw.h" |
| #include "riff.h" |
| |
| typedef struct { |
| int64_t atrpos, atsqpos, awapos; |
| int64_t data_size; |
| } 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(ByteIOContext *pb, int64_t start) |
| { |
| int64_t pos; |
| |
| pos = url_ftell(pb); |
| url_fseek(pb, start - 4, SEEK_SET); |
| put_be32(pb, (uint32_t)(pos - start)); |
| url_fseek(pb, pos, SEEK_SET); |
| } |
| |
| static int mmf_write_header(AVFormatContext *s) |
| { |
| MMFContext *mmf = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| int64_t pos; |
| int rate; |
| |
| rate = mmf_rate_code(s->streams[0]->codec->sample_rate); |
| if(rate < 0) { |
| av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate); |
| return -1; |
| } |
| |
| put_tag(pb, "MMMD"); |
| put_be32(pb, 0); |
| pos = start_tag(pb, "CNTI"); |
| put_byte(pb, 0); /* class */ |
| put_byte(pb, 0); /* type */ |
| put_byte(pb, 0); /* code type */ |
| put_byte(pb, 0); /* status */ |
| put_byte(pb, 0); /* counts */ |
| put_tag(pb, "VN:libavcodec,"); /* metadata ("ST:songtitle,VN:version,...") */ |
| end_tag_be(pb, pos); |
| |
| put_buffer(pb, "ATR\x00", 4); |
| put_be32(pb, 0); |
| mmf->atrpos = url_ftell(pb); |
| put_byte(pb, 0); /* format type */ |
| put_byte(pb, 0); /* sequence type */ |
| put_byte(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */ |
| put_byte(pb, 0); /* wave base bit */ |
| put_byte(pb, 2); /* time base d */ |
| put_byte(pb, 2); /* time base g */ |
| |
| put_tag(pb, "Atsq"); |
| put_be32(pb, 16); |
| mmf->atsqpos = url_ftell(pb); |
| /* Will be filled on close */ |
| put_buffer(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); |
| |
| mmf->awapos = start_tag(pb, "Awa\x01"); |
| |
| av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate); |
| |
| put_flush_packet(pb); |
| |
| return 0; |
| } |
| |
| static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| ByteIOContext *pb = s->pb; |
| put_buffer(pb, pkt->data, pkt->size); |
| return 0; |
| } |
| |
| /* Write a variable-length symbol */ |
| static void put_varlength(ByteIOContext *pb, int val) |
| { |
| if(val < 128) |
| put_byte(pb, val); |
| else { |
| val -= 128; |
| put_byte(pb, 0x80 | val >> 7); |
| put_byte(pb, 0x7f & val); |
| } |
| } |
| |
| static int mmf_write_trailer(AVFormatContext *s) |
| { |
| ByteIOContext *pb = s->pb; |
| MMFContext *mmf = s->priv_data; |
| int64_t pos, size; |
| int gatetime; |
| |
| if (!url_is_streamed(s->pb)) { |
| /* Fill in length fields */ |
| end_tag_be(pb, mmf->awapos); |
| end_tag_be(pb, mmf->atrpos); |
| end_tag_be(pb, 8); |
| |
| pos = url_ftell(pb); |
| size = pos - mmf->awapos; |
| |
| /* Fill Atsq chunk */ |
| url_fseek(pb, mmf->atsqpos, SEEK_SET); |
| |
| /* "play wav" */ |
| put_byte(pb, 0); /* start time */ |
| put_byte(pb, 1); /* (channel << 6) | wavenum */ |
| gatetime = size * 500 / s->streams[0]->codec->sample_rate; |
| put_varlength(pb, gatetime); /* duration */ |
| |
| /* "nop" */ |
| put_varlength(pb, gatetime); /* start time */ |
| put_buffer(pb, "\xff\x00", 2); /* nop */ |
| |
| /* "end of sequence" */ |
| put_buffer(pb, "\x00\x00\x00\x00", 4); |
| |
| url_fseek(pb, pos, SEEK_SET); |
| |
| put_flush_packet(pb); |
| } |
| return 0; |
| } |
| #endif /* CONFIG_MMF_MUXER */ |
| |
| static int mmf_probe(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, |
| AVFormatParameters *ap) |
| { |
| MMFContext *mmf = s->priv_data; |
| unsigned int tag; |
| ByteIOContext *pb = s->pb; |
| AVStream *st; |
| int64_t file_size, size; |
| int rate, params; |
| |
| tag = get_le32(pb); |
| if (tag != MKTAG('M', 'M', 'M', 'D')) |
| return -1; |
| file_size = get_be32(pb); |
| |
| /* Skip some unused chunks that may or may not be present */ |
| for(;; url_fseek(pb, size, SEEK_CUR)) { |
| tag = get_le32(pb); |
| size = get_be32(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 -1; |
| } |
| if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) { |
| av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag); |
| return -1; |
| } |
| |
| get_byte(pb); /* format type */ |
| get_byte(pb); /* sequence type */ |
| params = get_byte(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 -1; |
| } |
| get_byte(pb); /* wave base bit */ |
| get_byte(pb); /* time base d */ |
| get_byte(pb); /* time base g */ |
| |
| /* Skip some unused chunks that may or may not be present */ |
| for(;; url_fseek(pb, size, SEEK_CUR)) { |
| tag = get_le32(pb); |
| size = get_be32(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 -1; |
| } |
| mmf->data_size = size; |
| |
| st = av_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codec->codec_type = CODEC_TYPE_AUDIO; |
| st->codec->codec_id = CODEC_ID_ADPCM_YAMAHA; |
| st->codec->sample_rate = rate; |
| st->codec->channels = 1; |
| st->codec->bits_per_coded_sample = 4; |
| st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample; |
| |
| av_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| |
| return 0; |
| } |
| |
| #define MAX_SIZE 4096 |
| |
| static int mmf_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| MMFContext *mmf = s->priv_data; |
| AVStream *st; |
| int ret, size; |
| |
| if (url_feof(s->pb)) |
| return AVERROR(EIO); |
| st = s->streams[0]; |
| |
| size = MAX_SIZE; |
| if(size > mmf->data_size) |
| size = mmf->data_size; |
| |
| if(!size) |
| return AVERROR(EIO); |
| |
| if (av_new_packet(pkt, size)) |
| return AVERROR(EIO); |
| pkt->stream_index = 0; |
| |
| ret = get_buffer(s->pb, pkt->data, pkt->size); |
| if (ret < 0) |
| av_free_packet(pkt); |
| |
| mmf->data_size -= ret; |
| |
| pkt->size = ret; |
| return ret; |
| } |
| |
| #if CONFIG_MMF_DEMUXER |
| AVInputFormat mmf_demuxer = { |
| "mmf", |
| NULL_IF_CONFIG_SMALL("Yamaha SMAF"), |
| sizeof(MMFContext), |
| mmf_probe, |
| mmf_read_header, |
| mmf_read_packet, |
| NULL, |
| pcm_read_seek, |
| }; |
| #endif |
| #if CONFIG_MMF_MUXER |
| AVOutputFormat mmf_muxer = { |
| "mmf", |
| NULL_IF_CONFIG_SMALL("Yamaha SMAF"), |
| "application/vnd.smaf", |
| "mmf", |
| sizeof(MMFContext), |
| CODEC_ID_ADPCM_YAMAHA, |
| CODEC_ID_NONE, |
| mmf_write_header, |
| mmf_write_packet, |
| mmf_write_trailer, |
| }; |
| #endif |