* Musepack SV8 demuxer
* Copyright (c) 2007 Konstantin Shishkov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/get_bits.h"
#include "libavcodec/unary.h"
#include "avformat.h"
+#include "avio_internal.h"
/// Two-byte MPC tag
#define MKMPCTAG(a, b) (a | (b << 8))
int64_t samples;
} MPCContext;
+static inline int64_t bs_get_v(uint8_t **bs)
+{
+ int64_t v = 0;
+ int br = 0;
+ int c;
+
+ do {
+ c = **bs; (*bs)++;
+ v <<= 7;
+ v |= c & 0x7F;
+ br++;
+ if (br > 10)
+ return -1;
+ } while (c & 0x80);
+
+ return v - br;
+}
+
static int mpc8_probe(AVProbeData *p)
{
+ uint8_t *bs = p->buf + 4;
+ uint8_t *bs_end = bs + p->buf_size;
+ int64_t size;
+
if (p->buf_size < 16)
return 0;
if (AV_RL32(p->buf) != TAG_MPCK)
return 0;
- if (p->buf[4] == 'S' && p->buf[5] == 'H') {
- int size = p->buf[6];
-
- if (size < 12 || size > 30)
- return 0;
- if (!AV_RL32(&p->buf[7])) //zero CRC is invalid
- return 0;
- //check whether some tag follows stream header or not
- if (p->buf[4 + size] < 'A' || p->buf[4 + size] > 'Z')
- return 0;
- if (p->buf[5 + size] < 'A' || p->buf[5 + size] > 'Z')
+ while (bs < bs_end + 3) {
+ int header_found = (bs[0] == 'S' && bs[1] == 'H');
+ if (bs[0] < 'A' || bs[0] > 'Z' || bs[1] < 'A' || bs[1] > 'Z')
return 0;
- if (p->buf[6 + size] < 3)
+ bs += 2;
+ size = bs_get_v(&bs);
+ if (size < 2)
return 0;
- return AVPROBE_SCORE_MAX;
+ if (bs + size - 2 >= bs_end)
+ return AVPROBE_SCORE_MAX / 4 - 1; //seems to be valid MPC but no header yet
+ if (header_found) {
+ if (size < 11 || size > 28)
+ return 0;
+ if (!AV_RL32(bs)) //zero CRC is invalid
+ return 0;
+ return AVPROBE_SCORE_MAX;
+ } else {
+ bs += size - 2;
+ }
}
- /* file magic number should be followed by tag name which consists of
- two uppercase letters */
- if (p->buf[4] < 'A' || p->buf[4] > 'Z' || p->buf[5] < 'A' || p->buf[5] > 'Z')
- return 0;
- // tag size should be >= 3
- if (p->buf[6] < 3)
- return 0;
- // if first tag is not stream header, that's suspicious
- return AVPROBE_SCORE_MAX / 4;
+ return 0;
}
static inline int64_t gb_get_v(GetBitContext *gb)
return v;
}
-static void mpc8_get_chunk_header(ByteIOContext *pb, int *tag, int64_t *size)
+static void mpc8_get_chunk_header(AVIOContext *pb, int *tag, int64_t *size)
{
int64_t pos;
- pos = url_ftell(pb);
- *tag = get_le16(pb);
- *size = ff_get_v(pb);
- *size -= url_ftell(pb) - pos;
+ pos = avio_tell(pb);
+ *tag = avio_rl16(pb);
+ *size = ffio_read_varlen(pb);
+ *size -= avio_tell(pb) - pos;
}
static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
int i, t, seekd;
GetBitContext gb;
- url_fseek(s->pb, off, SEEK_SET);
+ avio_seek(s->pb, off, SEEK_SET);
mpc8_get_chunk_header(s->pb, &tag, &size);
if(tag != TAG_SEEKTABLE){
av_log(s, AV_LOG_ERROR, "No seek table at given position\n");
}
if(!(buf = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE)))
return;
- get_buffer(s->pb, buf, size);
+ avio_read(s->pb, buf, size);
init_get_bits(&gb, buf, size * 8);
size = gb_get_v(&gb);
if(size > UINT_MAX/4 || size > c->samples/1152){
static void mpc8_handle_chunk(AVFormatContext *s, int tag, int64_t chunk_pos, int64_t size)
{
- ByteIOContext *pb = s->pb;
+ AVIOContext *pb = s->pb;
int64_t pos, off;
switch(tag){
case TAG_SEEKTBLOFF:
- pos = url_ftell(pb) + size;
- off = ff_get_v(pb);
+ pos = avio_tell(pb) + size;
+ off = ffio_read_varlen(pb);
mpc8_parse_seektable(s, chunk_pos + off);
- url_fseek(pb, pos, SEEK_SET);
+ avio_seek(pb, pos, SEEK_SET);
break;
default:
- url_fskip(pb, size);
+ avio_skip(pb, size);
}
}
static int mpc8_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
MPCContext *c = s->priv_data;
- ByteIOContext *pb = s->pb;
+ AVIOContext *pb = s->pb;
AVStream *st;
int tag = 0;
int64_t size, pos;
- c->header_pos = url_ftell(pb);
- if(get_le32(pb) != TAG_MPCK){
+ c->header_pos = avio_tell(pb);
+ if(avio_rl32(pb) != TAG_MPCK){
av_log(s, AV_LOG_ERROR, "Not a Musepack8 file\n");
return -1;
}
- while(!url_feof(pb)){
- pos = url_ftell(pb);
+ while(!pb->eof_reached){
+ pos = avio_tell(pb);
mpc8_get_chunk_header(pb, &tag, &size);
if(tag == TAG_STREAMHDR)
break;
av_log(s, AV_LOG_ERROR, "Stream header not found\n");
return -1;
}
- pos = url_ftell(pb);
- url_fskip(pb, 4); //CRC
- c->ver = get_byte(pb);
+ pos = avio_tell(pb);
+ avio_skip(pb, 4); //CRC
+ c->ver = avio_r8(pb);
if(c->ver != 8){
av_log(s, AV_LOG_ERROR, "Unknown stream version %d\n", c->ver);
return -1;
}
- c->samples = ff_get_v(pb);
- ff_get_v(pb); //silence samples at the beginning
+ c->samples = ffio_read_varlen(pb);
+ ffio_read_varlen(pb); //silence samples at the beginning
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
- st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_MUSEPACK8;
st->codec->bits_per_coded_sample = 16;
st->codec->extradata_size = 2;
st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
- get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
+ avio_read(pb, st->codec->extradata, st->codec->extradata_size);
st->codec->channels = (st->codec->extradata[1] >> 4) + 1;
st->codec->sample_rate = mpc8_rate[st->codec->extradata[0] >> 5];
av_set_pts_info(st, 32, 1152 << (st->codec->extradata[1]&3)*2, st->codec->sample_rate);
st->duration = c->samples / (1152 << (st->codec->extradata[1]&3)*2);
- size -= url_ftell(pb) - pos;
+ size -= avio_tell(pb) - pos;
return 0;
}
int tag;
int64_t pos, size;
- while(!url_feof(s->pb)){
- pos = url_ftell(s->pb);
+ while(!s->pb->eof_reached){
+ pos = avio_tell(s->pb);
mpc8_get_chunk_header(s->pb, &tag, &size);
+ if (size < 0)
+ return -1;
if(tag == TAG_AUDIOPACKET){
if(av_get_packet(s->pb, pkt, size) < 0)
return AVERROR(ENOMEM);
int index = av_index_search_timestamp(st, timestamp, flags);
if(index < 0) return -1;
- url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
+ avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
c->frame = st->index_entries[index].timestamp;
return 0;
}
-AVInputFormat mpc8_demuxer = {
+AVInputFormat ff_mpc8_demuxer = {
"mpc8",
NULL_IF_CONFIG_SMALL("Musepack SV8"),
sizeof(MPCContext),
projects / ffmpeg / blobdiff