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https://github.com/FFmpeg/FFmpeg.git
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cea7c19cda
Those are private fields, no reason to have them exposed in a public header. Since there are some (semi-)public fields located after these, even though this section is supposed to be private, keep some dummy padding there until the next major bump to preserve ABI compatibility.
231 lines
6.8 KiB
C
231 lines
6.8 KiB
C
/*
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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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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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#include "apetag.h"
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#include "id3v1.h"
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#include "libavutil/dict.h"
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#define MPC_FRAMESIZE 1152
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#define DELAY_FRAMES 32
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static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
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typedef struct MPCFrame {
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int64_t pos;
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int size, skip;
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}MPCFrame;
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typedef struct MPCContext {
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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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static int mpc_probe(const AVProbeData *p)
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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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static int mpc_read_header(AVFormatContext *s)
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{
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MPCContext *c = s->priv_data;
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AVStream *st;
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int ret;
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if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
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av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
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return AVERROR_INVALIDDATA;
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}
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c->ver = avio_r8(s->pb);
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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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return AVERROR_INVALIDDATA;
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}
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c->fcount = avio_rl32(s->pb);
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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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return AVERROR_INVALIDDATA;
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}
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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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c->frames_noted = 0;
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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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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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st->priv_data = c->frames;
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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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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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if ((ret = ff_get_extradata(s, st->codecpar, s->pb, 16)) < 0)
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return ret;
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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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/* scan for seekpoints */
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st->start_time = 0;
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st->duration = c->fcount;
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/* try to read APE tags */
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if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
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int64_t pos = avio_tell(s->pb);
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ff_ape_parse_tag(s);
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if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
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ff_id3v1_read(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 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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unsigned tmp;
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int64_t pos;
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if (c->curframe >= c->fcount && c->fcount)
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return AVERROR_EOF;
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if(c->curframe != c->lastframe + 1){
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avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET);
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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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pos = avio_tell(s->pb);
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tmp = avio_rl32(s->pb);
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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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size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF;
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}
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curbits += 20;
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avio_seek(s->pb, pos, SEEK_SET);
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size = ((size2 + curbits + 31) & ~31) >> 3;
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if(cur == c->frames_noted && c->fcount){
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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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if ((ret = av_new_packet(pkt, size + 4)) < 0)
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return ret;
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pkt->data[0] = curbits;
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pkt->data[1] = (c->curframe > c->fcount) && c->fcount;
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pkt->data[2] = 0;
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pkt->data[3] = 0;
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pkt->stream_index = 0;
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pkt->pts = cur;
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ret = avio_read(s->pb, pkt->data + 4, size);
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if(c->curbits)
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avio_seek(s->pb, -4, SEEK_CUR);
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if(ret < size){
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return ret < 0 ? ret : AVERROR(EIO);
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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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/**
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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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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;
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AVPacket pkt1, *pkt = &pkt1;
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int ret;
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int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags);
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uint32_t lastframe;
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/* if found, seek there */
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if (index >= 0 && st->internal->index_entries[st->internal->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES){
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c->curframe = st->internal->index_entries[index].pos;
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return 0;
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}
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/* if timestamp is out of bounds, return error */
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if(timestamp < 0 || timestamp >= c->fcount)
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return -1;
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timestamp -= DELAY_FRAMES;
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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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if(c->frames_noted) c->curframe = c->frames_noted - 1;
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while(c->curframe < timestamp){
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ret = av_read_frame(s, pkt);
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if (ret < 0){
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c->curframe = lastframe;
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return ret;
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}
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av_packet_unref(pkt);
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}
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return 0;
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}
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AVInputFormat ff_mpc_demuxer = {
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.name = "mpc",
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.long_name = NULL_IF_CONFIG_SMALL("Musepack"),
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.priv_data_size = sizeof(MPCContext),
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.read_probe = mpc_probe,
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.read_header = mpc_read_header,
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.read_packet = mpc_read_packet,
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.read_seek = mpc_read_seek,
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.extensions = "mpc",
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};
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