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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
361 lines
10 KiB
C
361 lines
10 KiB
C
/*
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* Musepack SV8 demuxer
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* Copyright (c) 2007 Konstantin Shishkov
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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 "libavutil/mem.h"
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#include "libavcodec/get_bits.h"
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#include "libavcodec/unary.h"
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#include "apetag.h"
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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#include "avio_internal.h"
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/// Two-byte MPC tag
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#define MKMPCTAG(a, b) ((a) | ((b) << 8))
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#define TAG_MPCK MKTAG('M','P','C','K')
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/// Reserved MPC tags
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enum MPCPacketTags{
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TAG_STREAMHDR = MKMPCTAG('S','H'),
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TAG_STREAMEND = MKMPCTAG('S','E'),
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TAG_AUDIOPACKET = MKMPCTAG('A','P'),
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TAG_SEEKTBLOFF = MKMPCTAG('S','O'),
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TAG_SEEKTABLE = MKMPCTAG('S','T'),
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TAG_REPLAYGAIN = MKMPCTAG('R','G'),
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TAG_ENCINFO = MKMPCTAG('E','I'),
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};
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static const int mpc8_rate[8] = { 44100, 48000, 37800, 32000, -1, -1, -1, -1 };
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typedef struct MPCContext {
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int ver;
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int64_t header_pos;
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int64_t samples;
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int64_t apetag_start;
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} MPCContext;
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static inline int64_t bs_get_v(const uint8_t **bs)
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{
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uint64_t v = 0;
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int br = 0;
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int c;
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do {
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c = **bs; (*bs)++;
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v <<= 7;
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v |= c & 0x7F;
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br++;
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if (br > 10)
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return -1;
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} while (c & 0x80);
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return v - br;
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}
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static int mpc8_probe(const AVProbeData *p)
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{
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const uint8_t *bs = p->buf + 4;
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const uint8_t *bs_end = bs + p->buf_size;
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int64_t size;
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if (p->buf_size < 16)
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return 0;
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if (AV_RL32(p->buf) != TAG_MPCK)
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return 0;
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while (bs < bs_end + 3) {
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int header_found = (bs[0] == 'S' && bs[1] == 'H');
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if (bs[0] < 'A' || bs[0] > 'Z' || bs[1] < 'A' || bs[1] > 'Z')
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return 0;
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bs += 2;
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size = bs_get_v(&bs);
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if (size < 2)
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return 0;
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if (size >= bs_end - bs + 2)
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return AVPROBE_SCORE_EXTENSION - 1; // seems to be valid MPC but no header yet
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if (header_found) {
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if (size < 11 || size > 28)
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return 0;
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if (!AV_RL32(bs)) //zero CRC is invalid
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return 0;
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return AVPROBE_SCORE_MAX;
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} else {
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bs += size - 2;
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}
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}
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return 0;
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}
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static inline int64_t gb_get_v(GetBitContext *gb)
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{
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uint64_t v = 0;
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int bits = 0;
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while(get_bits1(gb) && bits < 64-7){
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v <<= 7;
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v |= get_bits(gb, 7);
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bits += 7;
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}
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v <<= 7;
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v |= get_bits(gb, 7);
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return v;
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}
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static void mpc8_get_chunk_header(AVIOContext *pb, int *tag, int64_t *size)
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{
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int64_t pos;
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pos = avio_tell(pb);
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*tag = avio_rl16(pb);
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*size = ffio_read_varlen(pb);
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pos -= avio_tell(pb);
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if (av_sat_add64(*size, pos) != (uint64_t)*size + pos) {
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*size = -1;
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} else
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*size += pos;
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}
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static int mpc8_parse_seektable(AVFormatContext *s, int64_t off)
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{
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MPCContext *c = s->priv_data;
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int tag;
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int64_t size, pos, ppos[2];
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uint8_t *buf;
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int i, t, seekd, ret;
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int64_t ret64;
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GetBitContext gb;
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if (s->nb_streams == 0) {
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av_log(s, AV_LOG_ERROR, "No stream added before parsing seek table\n");
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return AVERROR_INVALIDDATA;
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}
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ret64 = avio_seek(s->pb, off, SEEK_SET);
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if (ret64 < 0)
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return AVERROR_INVALIDDATA;
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mpc8_get_chunk_header(s->pb, &tag, &size);
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if(tag != TAG_SEEKTABLE || avio_feof(s->pb)){
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av_log(s, AV_LOG_ERROR, "No seek table at given position\n");
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return AVERROR_INVALIDDATA;
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}
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if (size > INT_MAX/10 || size<=0) {
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av_log(s, AV_LOG_ERROR, "Bad seek table size\n");
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return AVERROR_INVALIDDATA;
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}
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if(!(buf = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE)))
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return AVERROR(ENOMEM);
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ret = avio_read(s->pb, buf, size);
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if (ret != size) {
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av_log(s, AV_LOG_ERROR, "seek table truncated\n");
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av_free(buf);
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return AVERROR_INVALIDDATA;
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}
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memset(buf+size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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init_get_bits(&gb, buf, size * 8);
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size = gb_get_v(&gb);
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if(size > UINT_MAX/4 || size > c->samples/1152){
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av_log(s, AV_LOG_ERROR, "Seek table is too big\n");
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av_free(buf);
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return AVERROR_INVALIDDATA;
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}
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seekd = get_bits(&gb, 4);
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for(i = 0; i < 2; i++){
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pos = gb_get_v(&gb);
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if (av_sat_add64(pos, c->header_pos) != pos + (uint64_t)c->header_pos) {
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av_free(buf);
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return AVERROR_INVALIDDATA;
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}
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pos += c->header_pos;
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ppos[1 - i] = pos;
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av_add_index_entry(s->streams[0], pos, i, 0, 0, AVINDEX_KEYFRAME);
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}
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for(; i < size; i++){
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if (get_bits_left(&gb) < 13) {
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av_free(buf);
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return AVERROR_INVALIDDATA;
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}
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t = get_unary(&gb, 1, 33) << 12;
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t += get_bits(&gb, 12);
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if(t & 1)
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t = -(t & ~1);
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pos = (t >> 1) + (uint64_t)ppos[0]*2 - ppos[1];
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av_add_index_entry(s->streams[0], pos, (int64_t)i << seekd, 0, 0, AVINDEX_KEYFRAME);
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ppos[1] = ppos[0];
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ppos[0] = pos;
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}
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av_free(buf);
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return 0;
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}
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static int mpc8_handle_chunk(AVFormatContext *s, int tag, int64_t chunk_pos, int64_t size)
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{
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AVIOContext *pb = s->pb;
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int64_t pos, off;
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int ret;
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switch(tag){
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case TAG_SEEKTBLOFF:
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pos = avio_tell(pb);
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off = ffio_read_varlen(pb);
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if (pos > INT64_MAX - size || off < 0 || off > INT64_MAX - chunk_pos)
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return AVERROR_INVALIDDATA;
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pos += size;
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ret = mpc8_parse_seektable(s, chunk_pos + off);
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if (ret < 0)
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return AVERROR_INVALIDDATA;
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avio_seek(pb, pos, SEEK_SET);
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break;
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default:
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avio_skip(pb, size);
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}
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return 0;
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}
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static int mpc8_read_header(AVFormatContext *s)
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{
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MPCContext *c = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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int tag = 0, ret;
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int channels;
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int64_t size, pos;
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c->header_pos = avio_tell(pb);
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if(avio_rl32(pb) != TAG_MPCK){
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av_log(s, AV_LOG_ERROR, "Not a Musepack8 file\n");
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return AVERROR_INVALIDDATA;
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}
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while(!avio_feof(pb)){
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pos = avio_tell(pb);
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mpc8_get_chunk_header(pb, &tag, &size);
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if (size < 0) {
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av_log(s, AV_LOG_ERROR, "Invalid chunk length\n");
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return AVERROR_INVALIDDATA;
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}
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if(tag == TAG_STREAMHDR)
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break;
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ret = mpc8_handle_chunk(s, tag, pos, size);
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if (ret < 0)
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return ret;
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}
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if(tag != TAG_STREAMHDR){
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av_log(s, AV_LOG_ERROR, "Stream header not found\n");
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return AVERROR_INVALIDDATA;
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}
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pos = avio_tell(pb);
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avio_skip(pb, 4); //CRC
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c->ver = avio_r8(pb);
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if(c->ver != 8){
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avpriv_report_missing_feature(s, "Stream version %d", c->ver);
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return AVERROR_PATCHWELCOME;
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}
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c->samples = ffio_read_varlen(pb);
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ffio_read_varlen(pb); //silence samples at the beginning
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_MUSEPACK8;
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st->codecpar->bits_per_coded_sample = 16;
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if ((ret = ff_get_extradata(s, st->codecpar, pb, 2)) < 0)
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return ret;
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channels = (st->codecpar->extradata[1] >> 4) + 1;
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st->codecpar->ch_layout.nb_channels = channels;
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st->codecpar->sample_rate = mpc8_rate[st->codecpar->extradata[0] >> 5];
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avpriv_set_pts_info(st, 64, 1152 << (st->codecpar->extradata[1]&3)*2, st->codecpar->sample_rate);
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st->start_time = 0;
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st->duration = c->samples / (1152 << (st->codecpar->extradata[1]&3)*2);
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size -= avio_tell(pb) - pos;
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if (size > 0)
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avio_skip(pb, size);
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if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
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int64_t pos = avio_tell(s->pb);
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c->apetag_start = ff_ape_parse_tag(s);
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avio_seek(s->pb, pos, SEEK_SET);
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}
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return 0;
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}
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static int mpc8_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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MPCContext *c = s->priv_data;
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int tag, ret;
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int64_t pos, size;
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while(!avio_feof(s->pb)){
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pos = avio_tell(s->pb);
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/* don't return bogus packets with the ape tag data */
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if (c->apetag_start && pos >= c->apetag_start)
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return AVERROR_EOF;
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mpc8_get_chunk_header(s->pb, &tag, &size);
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if (size < 0 || size > INT_MAX)
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return -1;
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if(tag == TAG_AUDIOPACKET){
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if ((ret = av_get_packet(s->pb, pkt, size)) < 0)
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return ret;
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pkt->stream_index = 0;
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pkt->duration = 1;
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return 0;
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}
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if(tag == TAG_STREAMEND)
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return AVERROR_EOF;
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mpc8_handle_chunk(s, tag, pos, size);
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}
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return AVERROR_EOF;
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}
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static int mpc8_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
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{
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AVStream *st = s->streams[stream_index];
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FFStream *const sti = ffstream(st);
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int index = av_index_search_timestamp(st, timestamp, flags);
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if(index < 0) return -1;
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if (avio_seek(s->pb, sti->index_entries[index].pos, SEEK_SET) < 0)
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return -1;
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avpriv_update_cur_dts(s, st, sti->index_entries[index].timestamp);
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return 0;
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}
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const FFInputFormat ff_mpc8_demuxer = {
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.p.name = "mpc8",
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.p.long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
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.priv_data_size = sizeof(MPCContext),
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.read_probe = mpc8_probe,
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.read_header = mpc8_read_header,
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.read_packet = mpc8_read_packet,
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.read_seek = mpc8_read_seek,
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};
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