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318 lines
8.2 KiB
318 lines
8.2 KiB
/* |
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* Yamaha SMAF format |
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* Copyright (c) 2005 Vidar Madsen |
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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 "avformat.h" |
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#include "raw.h" |
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#include "riff.h" |
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typedef struct { |
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offset_t atrpos, atsqpos, awapos; |
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offset_t data_size; |
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} MMFContext; |
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static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 }; |
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static int mmf_rate(int code) |
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{ |
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if((code < 0) || (code > 4)) |
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return -1; |
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return mmf_rates[code]; |
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} |
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#ifdef CONFIG_MMF_MUXER |
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static int mmf_rate_code(int rate) |
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{ |
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int i; |
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for(i = 0; i < 5; i++) |
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if(mmf_rates[i] == rate) |
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return i; |
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return -1; |
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} |
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/* Copy of end_tag() from avienc.c, but for big-endian chunk size */ |
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static void end_tag_be(ByteIOContext *pb, offset_t start) |
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{ |
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offset_t pos; |
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pos = url_ftell(pb); |
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url_fseek(pb, start - 4, SEEK_SET); |
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put_be32(pb, (uint32_t)(pos - start)); |
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url_fseek(pb, pos, SEEK_SET); |
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} |
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static int mmf_write_header(AVFormatContext *s) |
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{ |
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MMFContext *mmf = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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offset_t pos; |
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int rate; |
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rate = mmf_rate_code(s->streams[0]->codec->sample_rate); |
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if(rate < 0) { |
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av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate); |
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return -1; |
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} |
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put_tag(pb, "MMMD"); |
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put_be32(pb, 0); |
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pos = start_tag(pb, "CNTI"); |
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put_byte(pb, 0); /* class */ |
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put_byte(pb, 0); /* type */ |
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put_byte(pb, 0); /* code type */ |
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put_byte(pb, 0); /* status */ |
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put_byte(pb, 0); /* counts */ |
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put_tag(pb, "VN:libavcodec,"); /* metadata ("ST:songtitle,VN:version,...") */ |
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end_tag_be(pb, pos); |
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put_buffer(pb, "ATR\x00", 4); |
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put_be32(pb, 0); |
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mmf->atrpos = url_ftell(pb); |
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put_byte(pb, 0); /* format type */ |
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put_byte(pb, 0); /* sequence type */ |
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put_byte(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */ |
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put_byte(pb, 0); /* wave base bit */ |
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put_byte(pb, 2); /* time base d */ |
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put_byte(pb, 2); /* time base g */ |
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put_tag(pb, "Atsq"); |
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put_be32(pb, 16); |
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mmf->atsqpos = url_ftell(pb); |
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/* Will be filled on close */ |
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put_buffer(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); |
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mmf->awapos = start_tag(pb, "Awa\x01"); |
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av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate); |
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put_flush_packet(pb); |
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return 0; |
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} |
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static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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ByteIOContext *pb = s->pb; |
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put_buffer(pb, pkt->data, pkt->size); |
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return 0; |
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} |
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/* Write a variable-length symbol */ |
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static void put_varlength(ByteIOContext *pb, int val) |
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{ |
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if(val < 128) |
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put_byte(pb, val); |
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else { |
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val -= 128; |
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put_byte(pb, 0x80 | val >> 7); |
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put_byte(pb, 0x7f & val); |
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} |
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} |
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static int mmf_write_trailer(AVFormatContext *s) |
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{ |
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ByteIOContext *pb = s->pb; |
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MMFContext *mmf = s->priv_data; |
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offset_t pos, size; |
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int gatetime; |
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if (!url_is_streamed(s->pb)) { |
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/* Fill in length fields */ |
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end_tag_be(pb, mmf->awapos); |
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end_tag_be(pb, mmf->atrpos); |
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end_tag_be(pb, 8); |
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pos = url_ftell(pb); |
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size = pos - mmf->awapos; |
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/* Fill Atsq chunk */ |
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url_fseek(pb, mmf->atsqpos, SEEK_SET); |
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/* "play wav" */ |
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put_byte(pb, 0); /* start time */ |
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put_byte(pb, 1); /* (channel << 6) | wavenum */ |
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gatetime = size * 500 / s->streams[0]->codec->sample_rate; |
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put_varlength(pb, gatetime); /* duration */ |
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/* "nop" */ |
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put_varlength(pb, gatetime); /* start time */ |
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put_buffer(pb, "\xff\x00", 2); /* nop */ |
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/* "end of sequence" */ |
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put_buffer(pb, "\x00\x00\x00\x00", 4); |
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url_fseek(pb, pos, SEEK_SET); |
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put_flush_packet(pb); |
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} |
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return 0; |
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} |
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#endif /* CONFIG_MMF_MUXER */ |
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static int mmf_probe(AVProbeData *p) |
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{ |
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/* check file header */ |
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if (p->buf[0] == 'M' && p->buf[1] == 'M' && |
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p->buf[2] == 'M' && p->buf[3] == 'D' && |
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p->buf[8] == 'C' && p->buf[9] == 'N' && |
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p->buf[10] == 'T' && p->buf[11] == 'I') |
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return AVPROBE_SCORE_MAX; |
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else |
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return 0; |
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} |
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/* mmf input */ |
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static int mmf_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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MMFContext *mmf = s->priv_data; |
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unsigned int tag; |
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ByteIOContext *pb = s->pb; |
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AVStream *st; |
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offset_t file_size, size; |
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int rate, params; |
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tag = get_le32(pb); |
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if (tag != MKTAG('M', 'M', 'M', 'D')) |
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return -1; |
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file_size = get_be32(pb); |
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/* Skip some unused chunks that may or may not be present */ |
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for(;; url_fseek(pb, size, SEEK_CUR)) { |
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tag = get_le32(pb); |
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size = get_be32(pb); |
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if(tag == MKTAG('C','N','T','I')) continue; |
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if(tag == MKTAG('O','P','D','A')) continue; |
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break; |
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} |
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/* Tag = "ATRx", where "x" = track number */ |
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if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) { |
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av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n"); |
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return -1; |
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} |
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if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) { |
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av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag); |
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return -1; |
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} |
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get_byte(pb); /* format type */ |
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get_byte(pb); /* sequence type */ |
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params = get_byte(pb); /* (channel << 7) | (format << 4) | rate */ |
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rate = mmf_rate(params & 0x0f); |
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if(rate < 0) { |
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av_log(s, AV_LOG_ERROR, "Invalid sample rate\n"); |
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return -1; |
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} |
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get_byte(pb); /* wave base bit */ |
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get_byte(pb); /* time base d */ |
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get_byte(pb); /* time base g */ |
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/* Skip some unused chunks that may or may not be present */ |
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for(;; url_fseek(pb, size, SEEK_CUR)) { |
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tag = get_le32(pb); |
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size = get_be32(pb); |
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if(tag == MKTAG('A','t','s','q')) continue; |
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if(tag == MKTAG('A','s','p','I')) continue; |
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break; |
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} |
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/* Make sure it's followed by an Awa chunk, aka wave data */ |
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if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) { |
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av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag); |
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return -1; |
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} |
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mmf->data_size = size; |
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st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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st->codec->codec_id = CODEC_ID_ADPCM_YAMAHA; |
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st->codec->sample_rate = rate; |
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st->codec->channels = 1; |
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st->codec->bits_per_sample = 4; |
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st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample; |
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av_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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return 0; |
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} |
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#define MAX_SIZE 4096 |
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static int mmf_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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MMFContext *mmf = s->priv_data; |
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AVStream *st; |
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int ret, size; |
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if (url_feof(s->pb)) |
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return AVERROR(EIO); |
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st = s->streams[0]; |
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size = MAX_SIZE; |
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if(size > mmf->data_size) |
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size = mmf->data_size; |
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if(!size) |
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return AVERROR(EIO); |
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if (av_new_packet(pkt, size)) |
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return AVERROR(EIO); |
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pkt->stream_index = 0; |
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ret = get_buffer(s->pb, pkt->data, pkt->size); |
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if (ret < 0) |
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av_free_packet(pkt); |
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mmf->data_size -= ret; |
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pkt->size = ret; |
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return ret; |
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} |
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#ifdef CONFIG_MMF_DEMUXER |
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AVInputFormat mmf_demuxer = { |
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"mmf", |
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NULL_IF_CONFIG_SMALL("mmf format"), |
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sizeof(MMFContext), |
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mmf_probe, |
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mmf_read_header, |
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mmf_read_packet, |
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NULL, |
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pcm_read_seek, |
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}; |
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#endif |
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#ifdef CONFIG_MMF_MUXER |
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AVOutputFormat mmf_muxer = { |
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"mmf", |
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NULL_IF_CONFIG_SMALL("mmf format"), |
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"application/vnd.smaf", |
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"mmf", |
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sizeof(MMFContext), |
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CODEC_ID_ADPCM_YAMAHA, |
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CODEC_ID_NONE, |
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mmf_write_header, |
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mmf_write_packet, |
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mmf_write_trailer, |
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}; |
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#endif
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