* 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 "apetag.h"
#include "avformat.h"
-#include "bitstream.h"
-#include "unary.h"
+#include "internal.h"
+#include "avio_internal.h"
/// Two-byte MPC tag
#define MKMPCTAG(a, b) (a | (b << 8))
typedef struct {
int ver;
- int frame;
int64_t header_pos;
int64_t samples;
+
+ int64_t apetag_start;
} 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)
{
- if (AV_RL32(p->buf) == TAG_MPCK)
- return AVPROBE_SCORE_MAX;
+ 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;
+ 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;
+ bs += 2;
+ size = bs_get_v(&bs);
+ if (size < 2)
+ return 0;
+ if (bs + size - 2 >= bs_end)
+ return AVPROBE_SCORE_EXTENSION - 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;
+ }
+ }
return 0;
}
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);
- mpc8_get_chunk_header(&s->pb, &tag, &size);
+ if (s->nb_streams == 0) {
+ av_log(s, AV_LOG_ERROR, "No stream added before parsing seek table\n");
+ return;
+ }
+
+ 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");
return;
}
- if(!(buf = av_malloc(size)))
+ if (size < 0 || size >= INT_MAX / 2) {
+ av_log(s, AV_LOG_ERROR, "Bad seek table size\n");
+ return;
+ }
+ 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)
+static int mpc8_read_header(AVFormatContext *s)
{
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;
+ return AVERROR_INVALIDDATA;
}
- 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;
}
if(tag != TAG_STREAMHDR){
av_log(s, AV_LOG_ERROR, "Stream header not found\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- 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;
+ return AVERROR_PATCHWELCOME;
}
- 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);
+ st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_MUSEPACK8;
- st->codec->bits_per_sample = 16;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = AV_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);
+ avpriv_set_pts_info(st, 32, 1152 << (st->codec->extradata[1]&3)*2, st->codec->sample_rate);
+ st->start_time = 0;
st->duration = c->samples / (1152 << (st->codec->extradata[1]&3)*2);
- size -= url_ftell(pb) - pos;
+ size -= avio_tell(pb) - pos;
+
+ if (pb->seekable) {
+ int64_t pos = avio_tell(s->pb);
+ c->apetag_start = ff_ape_parse_tag(s);
+ avio_seek(s->pb, pos, SEEK_SET);
+ }
return 0;
}
int tag;
int64_t pos, size;
- while(!url_feof(&s->pb)){
- pos = url_ftell(&s->pb);
- mpc8_get_chunk_header(&s->pb, &tag, &size);
+ while(!s->pb->eof_reached){
+ pos = avio_tell(s->pb);
+
+ /* don't return bogus packets with the ape tag data */
+ if (c->apetag_start && pos >= c->apetag_start)
+ return AVERROR_EOF;
+
+ 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)
+ if(av_get_packet(s->pb, pkt, size) < 0)
return AVERROR(ENOMEM);
pkt->stream_index = 0;
- pkt->pts = c->frame;
+ pkt->duration = 1;
return 0;
}
if(tag == TAG_STREAMEND)
return AVERROR(EIO);
mpc8_handle_chunk(s, tag, pos, size);
}
- return 0;
+ return AVERROR_EOF;
}
static int mpc8_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
- MPCContext *c = s->priv_data;
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);
- c->frame = st->index_entries[index].timestamp;
+ if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
+ return -1;
+ ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
return 0;
}
-AVInputFormat mpc8_demuxer = {
- "mpc8",
- "musepack8",
- sizeof(MPCContext),
- mpc8_probe,
- mpc8_read_header,
- mpc8_read_packet,
- NULL,
- mpc8_read_seek,
+AVInputFormat ff_mpc8_demuxer = {
+ .name = "mpc8",
+ .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
+ .priv_data_size = sizeof(MPCContext),
+ .read_probe = mpc8_probe,
+ .read_header = mpc8_read_header,
+ .read_packet = mpc8_read_packet,
+ .read_seek = mpc8_read_seek,
};
projects / ffmpeg / blobdiff