3 * Copyright (c) 2007 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "bitstream.h"
26 #define MKMPCTAG(a, b) (a | (b << 8))
28 #define TAG_MPCK MKTAG('M','P','C','K')
32 TAG_STREAMHDR = MKMPCTAG('S','H'),
33 TAG_STREAMEND = MKMPCTAG('S','E'),
35 TAG_AUDIOPACKET = MKMPCTAG('A','P'),
37 TAG_SEEKTBLOFF = MKMPCTAG('S','O'),
38 TAG_SEEKTABLE = MKMPCTAG('S','T'),
40 TAG_REPLAYGAIN = MKMPCTAG('R','G'),
41 TAG_ENCINFO = MKMPCTAG('E','I'),
44 static const int mpc8_rate[8] = { 44100, 48000, 37800, 32000, -1, -1, -1, -1 };
53 static int mpc8_probe(AVProbeData *p)
55 if (AV_RL32(p->buf) == TAG_MPCK)
56 return AVPROBE_SCORE_MAX;
60 static inline int64_t gb_get_v(GetBitContext *gb)
64 while(get_bits1(gb) && bits < 64-7){
75 static void mpc8_get_chunk_header(ByteIOContext *pb, int *tag, int64_t *size)
81 *size -= url_ftell(pb) - pos;
84 static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
86 MPCContext *c = s->priv_data;
88 int64_t size, pos, ppos[2];
93 url_fseek(s->pb, off, SEEK_SET);
94 mpc8_get_chunk_header(s->pb, &tag, &size);
95 if(tag != TAG_SEEKTABLE){
96 av_log(s, AV_LOG_ERROR, "No seek table at given position\n");
99 if(!(buf = av_malloc(size)))
101 get_buffer(s->pb, buf, size);
102 init_get_bits(&gb, buf, size * 8);
103 size = gb_get_v(&gb);
104 if(size > UINT_MAX/4 || size > c->samples/1152){
105 av_log(s, AV_LOG_ERROR, "Seek table is too big\n");
108 seekd = get_bits(&gb, 4);
109 for(i = 0; i < 2; i++){
110 pos = gb_get_v(&gb) + c->header_pos;
112 av_add_index_entry(s->streams[0], pos, i, 0, 0, AVINDEX_KEYFRAME);
114 for(; i < size; i++){
115 t = get_unary(&gb, 1, 33) << 12;
116 t += get_bits(&gb, 12);
119 pos = (t >> 1) + ppos[0]*2 - ppos[1];
120 av_add_index_entry(s->streams[0], pos, i << seekd, 0, 0, AVINDEX_KEYFRAME);
127 static void mpc8_handle_chunk(AVFormatContext *s, int tag, int64_t chunk_pos, int64_t size)
129 ByteIOContext *pb = s->pb;
134 pos = url_ftell(pb) + size;
136 mpc8_parse_seektable(s, chunk_pos + off);
137 url_fseek(pb, pos, SEEK_SET);
144 static int mpc8_read_header(AVFormatContext *s, AVFormatParameters *ap)
146 MPCContext *c = s->priv_data;
147 ByteIOContext *pb = s->pb;
152 c->header_pos = url_ftell(pb);
153 if(get_le32(pb) != TAG_MPCK){
154 av_log(s, AV_LOG_ERROR, "Not a Musepack8 file\n");
158 while(!url_feof(pb)){
160 mpc8_get_chunk_header(pb, &tag, &size);
161 if(tag == TAG_STREAMHDR)
163 mpc8_handle_chunk(s, tag, pos, size);
165 if(tag != TAG_STREAMHDR){
166 av_log(s, AV_LOG_ERROR, "Stream header not found\n");
170 url_fskip(pb, 4); //CRC
171 c->ver = get_byte(pb);
173 av_log(s, AV_LOG_ERROR, "Unknown stream version %d\n", c->ver);
176 c->samples = ff_get_v(pb);
177 ff_get_v(pb); //silence samples at the beginning
179 st = av_new_stream(s, 0);
181 return AVERROR(ENOMEM);
182 st->codec->codec_type = CODEC_TYPE_AUDIO;
183 st->codec->codec_id = CODEC_ID_MUSEPACK8;
184 st->codec->bits_per_sample = 16;
186 st->codec->extradata_size = 2;
187 st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
188 get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
190 st->codec->channels = (st->codec->extradata[1] >> 4) + 1;
191 st->codec->sample_rate = mpc8_rate[st->codec->extradata[0] >> 5];
192 av_set_pts_info(st, 32, 1152 << (st->codec->extradata[1]&3)*2, st->codec->sample_rate);
193 st->duration = c->samples / (1152 << (st->codec->extradata[1]&3)*2);
194 size -= url_ftell(pb) - pos;
199 static int mpc8_read_packet(AVFormatContext *s, AVPacket *pkt)
201 MPCContext *c = s->priv_data;
205 while(!url_feof(s->pb)){
206 pos = url_ftell(s->pb);
207 mpc8_get_chunk_header(s->pb, &tag, &size);
208 if(tag == TAG_AUDIOPACKET){
209 if(av_get_packet(s->pb, pkt, size) < 0)
210 return AVERROR(ENOMEM);
211 pkt->stream_index = 0;
215 if(tag == TAG_STREAMEND)
217 mpc8_handle_chunk(s, tag, pos, size);
222 static int mpc8_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
224 AVStream *st = s->streams[stream_index];
225 MPCContext *c = s->priv_data;
226 int index = av_index_search_timestamp(st, timestamp, flags);
228 if(index < 0) return -1;
229 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
230 c->frame = st->index_entries[index].timestamp;
235 AVInputFormat mpc8_demuxer = {