2006-12-24 04:51:43 +00:00
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/*
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* Musepack demuxer
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* Copyright (c) 2006 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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2007-07-05 10:40:25 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2006-12-24 04:51:43 +00:00
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*/
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2008-05-09 11:56:36 +00:00
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2012-04-07 21:03:19 +00:00
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#include "libavutil/channel_layout.h"
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2016-04-23 14:44:11 +00:00
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2006-12-24 04:51:43 +00:00
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#include "avformat.h"
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2011-11-29 18:28:15 +00:00
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#include "internal.h"
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2009-08-11 17:18:10 +00:00
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#include "apetag.h"
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2010-12-02 09:56:15 +00:00
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#include "id3v1.h"
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2011-05-22 10:46:29 +00:00
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#include "libavutil/dict.h"
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2006-12-24 04:51:43 +00:00
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#define MPC_FRAMESIZE 1152
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2007-01-01 05:32:27 +00:00
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#define DELAY_FRAMES 32
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2006-12-24 04:51:43 +00:00
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static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
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2014-09-22 07:19:33 +00:00
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typedef struct MPCFrame {
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2006-12-24 04:51:43 +00:00
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int64_t pos;
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int size, skip;
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}MPCFrame;
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2014-09-22 07:19:33 +00:00
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typedef struct MPCContext {
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2006-12-24 04:51:43 +00:00
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int ver;
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uint32_t curframe, lastframe;
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uint32_t fcount;
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MPCFrame *frames;
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int curbits;
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int frames_noted;
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} MPCContext;
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2019-03-21 00:18:37 +00:00
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static int mpc_probe(const AVProbeData *p)
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2006-12-24 04:51:43 +00:00
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{
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const uint8_t *d = p->buf;
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if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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2012-01-12 12:20:36 +00:00
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static int mpc_read_header(AVFormatContext *s)
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2006-12-24 04:51:43 +00:00
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{
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MPCContext *c = s->priv_data;
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AVStream *st;
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2011-02-21 15:43:01 +00:00
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if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
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2010-10-06 20:21:07 +00:00
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av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
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2012-07-29 20:19:35 +00:00
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return AVERROR_INVALIDDATA;
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2006-12-24 04:51:43 +00:00
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}
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2011-02-21 15:43:01 +00:00
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c->ver = avio_r8(s->pb);
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2006-12-24 04:51:43 +00:00
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if(c->ver != 0x07 && c->ver != 0x17){
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av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver);
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2012-07-29 20:19:35 +00:00
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return AVERROR_INVALIDDATA;
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2006-12-24 04:51:43 +00:00
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}
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2011-02-21 15:43:01 +00:00
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c->fcount = avio_rl32(s->pb);
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2006-12-24 04:51:43 +00:00
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if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){
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av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
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2012-07-29 20:19:35 +00:00
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return AVERROR_INVALIDDATA;
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2006-12-24 04:51:43 +00:00
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}
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2011-07-11 13:13:39 +00:00
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if(c->fcount){
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c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
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if(!c->frames){
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av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n");
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return AVERROR(ENOMEM);
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}
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}else{
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av_log(s, AV_LOG_WARNING, "Container reports no frames\n");
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}
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2006-12-24 04:51:43 +00:00
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c->curframe = 0;
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c->lastframe = -1;
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c->curbits = 8;
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2006-12-28 05:33:31 +00:00
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c->frames_noted = 0;
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2006-12-24 04:51:43 +00:00
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2011-06-18 09:43:24 +00:00
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st = avformat_new_stream(s, NULL);
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2006-12-24 04:51:43 +00:00
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if (!st)
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2019-07-24 21:11:50 +00:00
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goto mem_error;
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lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 18:42:52 +00:00
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_MUSEPACK7;
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st->codecpar->channels = 2;
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st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
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st->codecpar->bits_per_coded_sample = 16;
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2006-12-24 04:51:43 +00:00
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2016-04-14 16:21:08 +00:00
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if (ff_get_extradata(s, st->codecpar, s->pb, 16) < 0)
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2019-07-24 21:11:50 +00:00
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goto mem_error;
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lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 18:42:52 +00:00
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st->codecpar->sample_rate = mpc_rate[st->codecpar->extradata[2] & 3];
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avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codecpar->sample_rate);
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2006-12-24 04:51:43 +00:00
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/* scan for seekpoints */
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2010-01-21 09:47:02 +00:00
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st->start_time = 0;
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st->duration = c->fcount;
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2006-12-24 04:51:43 +00:00
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2009-08-11 17:18:10 +00:00
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/* try to read APE tags */
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2016-09-27 14:26:37 +00:00
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if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
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2011-03-03 19:11:45 +00:00
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int64_t pos = avio_tell(s->pb);
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2009-08-11 17:18:10 +00:00
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ff_ape_parse_tag(s);
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2011-05-22 10:46:29 +00:00
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if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
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2010-12-02 09:56:15 +00:00
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ff_id3v1_read(s);
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2011-02-28 13:57:54 +00:00
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avio_seek(s->pb, pos, SEEK_SET);
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2009-08-11 17:18:10 +00:00
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}
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2006-12-24 04:51:43 +00:00
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return 0;
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2019-07-24 21:11:50 +00:00
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mem_error:
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av_freep(&c->frames);
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return AVERROR(ENOMEM);
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2006-12-24 04:51:43 +00:00
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}
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static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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MPCContext *c = s->priv_data;
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int ret, size, size2, curbits, cur = c->curframe;
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2011-11-27 10:29:33 +00:00
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unsigned tmp;
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int64_t pos;
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2006-12-24 04:51:43 +00:00
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2011-07-11 13:13:39 +00:00
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if (c->curframe >= c->fcount && c->fcount)
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2012-07-29 20:19:35 +00:00
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return AVERROR_EOF;
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2006-12-24 04:51:43 +00:00
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if(c->curframe != c->lastframe + 1){
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2011-02-28 13:57:54 +00:00
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avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
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2006-12-24 04:51:43 +00:00
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c->curbits = c->frames[c->curframe].skip;
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}
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c->lastframe = c->curframe;
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c->curframe++;
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curbits = c->curbits;
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2011-03-03 19:11:45 +00:00
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pos = avio_tell(s->pb);
|
2011-02-21 15:43:01 +00:00
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tmp = avio_rl32(s->pb);
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2006-12-24 04:51:43 +00:00
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if(curbits <= 12){
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size2 = (tmp >> (12 - curbits)) & 0xFFFFF;
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}else{
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2011-11-27 10:29:33 +00:00
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size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
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2006-12-24 04:51:43 +00:00
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}
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curbits += 20;
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2011-02-28 13:57:54 +00:00
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avio_seek(s->pb, pos, SEEK_SET);
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2006-12-24 04:51:43 +00:00
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size = ((size2 + curbits + 31) & ~31) >> 3;
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2011-07-11 13:13:39 +00:00
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if(cur == c->frames_noted && c->fcount){
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2006-12-24 04:51:43 +00:00
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c->frames[cur].pos = pos;
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c->frames[cur].size = size;
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c->frames[cur].skip = curbits - 20;
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av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME);
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c->frames_noted++;
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}
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c->curbits = (curbits + size2) & 0x1F;
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2014-06-14 22:49:02 +00:00
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if ((ret = av_new_packet(pkt, size + 4)) < 0)
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2012-07-29 20:19:35 +00:00
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return ret;
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2006-12-24 04:51:43 +00:00
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pkt->data[0] = curbits;
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2011-07-11 13:13:39 +00:00
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pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
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2010-02-20 11:22:47 +00:00
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pkt->data[2] = 0;
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pkt->data[3] = 0;
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2006-12-24 04:51:43 +00:00
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pkt->stream_index = 0;
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2007-01-01 05:32:27 +00:00
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pkt->pts = cur;
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2011-02-21 15:43:01 +00:00
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ret = avio_read(s->pb, pkt->data + 4, size);
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2006-12-24 04:51:43 +00:00
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if(c->curbits)
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2011-02-28 13:57:54 +00:00
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avio_seek(s->pb, -4, SEEK_CUR);
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2006-12-24 04:51:43 +00:00
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if(ret < size){
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2012-07-29 20:19:35 +00:00
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return ret < 0 ? ret : AVERROR(EIO);
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2006-12-24 04:51:43 +00:00
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}
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pkt->size = ret + 4;
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return 0;
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}
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static int mpc_read_close(AVFormatContext *s)
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{
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MPCContext *c = s->priv_data;
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av_freep(&c->frames);
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return 0;
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}
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2006-12-28 05:33:31 +00:00
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/**
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* Seek to the given position
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* If position is unknown but is within the limits of file
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* then packets are skipped unless desired position is reached
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*
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* Also this function makes use of the fact that timestamp == frameno
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*/
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2006-12-24 04:51:43 +00:00
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static int mpc_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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MPCContext *c = s->priv_data;
|
2006-12-28 05:33:31 +00:00
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AVPacket pkt1, *pkt = &pkt1;
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int ret;
|
2012-08-27 02:51:27 +00:00
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int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags);
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2006-12-28 05:33:31 +00:00
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uint32_t lastframe;
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2006-12-24 04:51:43 +00:00
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2006-12-28 05:33:31 +00:00
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/* if found, seek there */
|
2012-08-27 03:01:51 +00:00
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if (index >= 0 && st->index_entries[st->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES){
|
2006-12-28 05:33:31 +00:00
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c->curframe = st->index_entries[index].pos;
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return 0;
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}
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|
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/* if timestamp is out of bounds, return error */
|
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|
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if(timestamp < 0 || timestamp >= c->fcount)
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return -1;
|
2007-01-01 05:32:27 +00:00
|
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timestamp -= DELAY_FRAMES;
|
2006-12-28 05:33:31 +00:00
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/* seek to the furthest known position and read packets until
|
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we reach desired position */
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lastframe = c->curframe;
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|
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if(c->frames_noted) c->curframe = c->frames_noted - 1;
|
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|
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while(c->curframe < timestamp){
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|
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ret = av_read_frame(s, pkt);
|
|
|
|
if (ret < 0){
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|
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c->curframe = lastframe;
|
2012-07-29 20:19:35 +00:00
|
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|
return ret;
|
2006-12-28 05:33:31 +00:00
|
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|
}
|
2015-10-23 09:11:31 +00:00
|
|
|
av_packet_unref(pkt);
|
2006-12-28 05:33:31 +00:00
|
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}
|
2006-12-24 04:51:43 +00:00
|
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return 0;
|
|
|
|
}
|
|
|
|
|
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|
|
2011-01-25 22:03:28 +00:00
|
|
|
AVInputFormat ff_mpc_demuxer = {
|
2011-07-16 20:18:12 +00:00
|
|
|
.name = "mpc",
|
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("Musepack"),
|
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|
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.priv_data_size = sizeof(MPCContext),
|
|
|
|
.read_probe = mpc_probe,
|
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|
|
.read_header = mpc_read_header,
|
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|
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.read_packet = mpc_read_packet,
|
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.read_close = mpc_read_close,
|
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.read_seek = mpc_read_seek,
|
2012-04-06 14:50:48 +00:00
|
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|
.extensions = "mpc",
|
2006-12-24 04:51:43 +00:00
|
|
|
};
|