1/* 2 * Yamaha SMAF format 3 * Copyright (c) 2005 Vidar Madsen 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21#include "avformat.h" 22#include "raw.h" 23#include "riff.h" 24 25typedef struct { 26 int64_t atrpos, atsqpos, awapos; 27 int64_t data_size; 28} MMFContext; 29 30static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 }; 31 32static int mmf_rate(int code) 33{ 34 if((code < 0) || (code > 4)) 35 return -1; 36 return mmf_rates[code]; 37} 38 39#if CONFIG_MMF_MUXER 40static int mmf_rate_code(int rate) 41{ 42 int i; 43 for(i = 0; i < 5; i++) 44 if(mmf_rates[i] == rate) 45 return i; 46 return -1; 47} 48 49/* Copy of end_tag() from avienc.c, but for big-endian chunk size */ 50static void end_tag_be(ByteIOContext *pb, int64_t start) 51{ 52 int64_t pos; 53 54 pos = url_ftell(pb); 55 url_fseek(pb, start - 4, SEEK_SET); 56 put_be32(pb, (uint32_t)(pos - start)); 57 url_fseek(pb, pos, SEEK_SET); 58} 59 60static int mmf_write_header(AVFormatContext *s) 61{ 62 MMFContext *mmf = s->priv_data; 63 ByteIOContext *pb = s->pb; 64 int64_t pos; 65 int rate; 66 67 rate = mmf_rate_code(s->streams[0]->codec->sample_rate); 68 if(rate < 0) { 69 av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate); 70 return -1; 71 } 72 73 put_tag(pb, "MMMD"); 74 put_be32(pb, 0); 75 pos = start_tag(pb, "CNTI"); 76 put_byte(pb, 0); /* class */ 77 put_byte(pb, 0); /* type */ 78 put_byte(pb, 0); /* code type */ 79 put_byte(pb, 0); /* status */ 80 put_byte(pb, 0); /* counts */ 81 put_tag(pb, "VN:libavcodec,"); /* metadata ("ST:songtitle,VN:version,...") */ 82 end_tag_be(pb, pos); 83 84 put_buffer(pb, "ATR\x00", 4); 85 put_be32(pb, 0); 86 mmf->atrpos = url_ftell(pb); 87 put_byte(pb, 0); /* format type */ 88 put_byte(pb, 0); /* sequence type */ 89 put_byte(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */ 90 put_byte(pb, 0); /* wave base bit */ 91 put_byte(pb, 2); /* time base d */ 92 put_byte(pb, 2); /* time base g */ 93 94 put_tag(pb, "Atsq"); 95 put_be32(pb, 16); 96 mmf->atsqpos = url_ftell(pb); 97 /* Will be filled on close */ 98 put_buffer(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); 99 100 mmf->awapos = start_tag(pb, "Awa\x01"); 101 102 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate); 103 104 put_flush_packet(pb); 105 106 return 0; 107} 108 109static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt) 110{ 111 ByteIOContext *pb = s->pb; 112 put_buffer(pb, pkt->data, pkt->size); 113 return 0; 114} 115 116/* Write a variable-length symbol */ 117static void put_varlength(ByteIOContext *pb, int val) 118{ 119 if(val < 128) 120 put_byte(pb, val); 121 else { 122 val -= 128; 123 put_byte(pb, 0x80 | val >> 7); 124 put_byte(pb, 0x7f & val); 125 } 126} 127 128static int mmf_write_trailer(AVFormatContext *s) 129{ 130 ByteIOContext *pb = s->pb; 131 MMFContext *mmf = s->priv_data; 132 int64_t pos, size; 133 int gatetime; 134 135 if (!url_is_streamed(s->pb)) { 136 /* Fill in length fields */ 137 end_tag_be(pb, mmf->awapos); 138 end_tag_be(pb, mmf->atrpos); 139 end_tag_be(pb, 8); 140 141 pos = url_ftell(pb); 142 size = pos - mmf->awapos; 143 144 /* Fill Atsq chunk */ 145 url_fseek(pb, mmf->atsqpos, SEEK_SET); 146 147 /* "play wav" */ 148 put_byte(pb, 0); /* start time */ 149 put_byte(pb, 1); /* (channel << 6) | wavenum */ 150 gatetime = size * 500 / s->streams[0]->codec->sample_rate; 151 put_varlength(pb, gatetime); /* duration */ 152 153 /* "nop" */ 154 put_varlength(pb, gatetime); /* start time */ 155 put_buffer(pb, "\xff\x00", 2); /* nop */ 156 157 /* "end of sequence" */ 158 put_buffer(pb, "\x00\x00\x00\x00", 4); 159 160 url_fseek(pb, pos, SEEK_SET); 161 162 put_flush_packet(pb); 163 } 164 return 0; 165} 166#endif /* CONFIG_MMF_MUXER */ 167 168static int mmf_probe(AVProbeData *p) 169{ 170 /* check file header */ 171 if (p->buf[0] == 'M' && p->buf[1] == 'M' && 172 p->buf[2] == 'M' && p->buf[3] == 'D' && 173 p->buf[8] == 'C' && p->buf[9] == 'N' && 174 p->buf[10] == 'T' && p->buf[11] == 'I') 175 return AVPROBE_SCORE_MAX; 176 else 177 return 0; 178} 179 180/* mmf input */ 181static int mmf_read_header(AVFormatContext *s, 182 AVFormatParameters *ap) 183{ 184 MMFContext *mmf = s->priv_data; 185 unsigned int tag; 186 ByteIOContext *pb = s->pb; 187 AVStream *st; 188 int64_t file_size, size; 189 int rate, params; 190 191 tag = get_le32(pb); 192 if (tag != MKTAG('M', 'M', 'M', 'D')) 193 return -1; 194 file_size = get_be32(pb); 195 196 /* Skip some unused chunks that may or may not be present */ 197 for(;; url_fseek(pb, size, SEEK_CUR)) { 198 tag = get_le32(pb); 199 size = get_be32(pb); 200 if(tag == MKTAG('C','N','T','I')) continue; 201 if(tag == MKTAG('O','P','D','A')) continue; 202 break; 203 } 204 205 /* Tag = "ATRx", where "x" = track number */ 206 if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) { 207 av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n"); 208 return -1; 209 } 210 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) { 211 av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag); 212 return -1; 213 } 214 215 get_byte(pb); /* format type */ 216 get_byte(pb); /* sequence type */ 217 params = get_byte(pb); /* (channel << 7) | (format << 4) | rate */ 218 rate = mmf_rate(params & 0x0f); 219 if(rate < 0) { 220 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n"); 221 return -1; 222 } 223 get_byte(pb); /* wave base bit */ 224 get_byte(pb); /* time base d */ 225 get_byte(pb); /* time base g */ 226 227 /* Skip some unused chunks that may or may not be present */ 228 for(;; url_fseek(pb, size, SEEK_CUR)) { 229 tag = get_le32(pb); 230 size = get_be32(pb); 231 if(tag == MKTAG('A','t','s','q')) continue; 232 if(tag == MKTAG('A','s','p','I')) continue; 233 break; 234 } 235 236 /* Make sure it's followed by an Awa chunk, aka wave data */ 237 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) { 238 av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag); 239 return -1; 240 } 241 mmf->data_size = size; 242 243 st = av_new_stream(s, 0); 244 if (!st) 245 return AVERROR(ENOMEM); 246 247 st->codec->codec_type = CODEC_TYPE_AUDIO; 248 st->codec->codec_id = CODEC_ID_ADPCM_YAMAHA; 249 st->codec->sample_rate = rate; 250 st->codec->channels = 1; 251 st->codec->bits_per_coded_sample = 4; 252 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample; 253 254 av_set_pts_info(st, 64, 1, st->codec->sample_rate); 255 256 return 0; 257} 258 259#define MAX_SIZE 4096 260 261static int mmf_read_packet(AVFormatContext *s, 262 AVPacket *pkt) 263{ 264 MMFContext *mmf = s->priv_data; 265 AVStream *st; 266 int ret, size; 267 268 if (url_feof(s->pb)) 269 return AVERROR(EIO); 270 st = s->streams[0]; 271 272 size = MAX_SIZE; 273 if(size > mmf->data_size) 274 size = mmf->data_size; 275 276 if(!size) 277 return AVERROR(EIO); 278 279 if (av_new_packet(pkt, size)) 280 return AVERROR(EIO); 281 pkt->stream_index = 0; 282 283 ret = get_buffer(s->pb, pkt->data, pkt->size); 284 if (ret < 0) 285 av_free_packet(pkt); 286 287 mmf->data_size -= ret; 288 289 pkt->size = ret; 290 return ret; 291} 292 293#if CONFIG_MMF_DEMUXER 294AVInputFormat mmf_demuxer = { 295 "mmf", 296 NULL_IF_CONFIG_SMALL("Yamaha SMAF"), 297 sizeof(MMFContext), 298 mmf_probe, 299 mmf_read_header, 300 mmf_read_packet, 301 NULL, 302 pcm_read_seek, 303}; 304#endif 305#if CONFIG_MMF_MUXER 306AVOutputFormat mmf_muxer = { 307 "mmf", 308 NULL_IF_CONFIG_SMALL("Yamaha SMAF"), 309 "application/vnd.smaf", 310 "mmf", 311 sizeof(MMFContext), 312 CODEC_ID_ADPCM_YAMAHA, 313 CODEC_ID_NONE, 314 mmf_write_header, 315 mmf_write_packet, 316 mmf_write_trailer, 317}; 318#endif 319