From 150c9823e71a161e97003849cf8b2f55b21520bd Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Mon, 26 Aug 2013 15:10:18 +0100 Subject: adding ffmpeg specific version --- ffmpeg1/libavformat/mpc.c | 237 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 237 insertions(+) create mode 100644 ffmpeg1/libavformat/mpc.c (limited to 'ffmpeg1/libavformat/mpc.c') diff --git a/ffmpeg1/libavformat/mpc.c b/ffmpeg1/libavformat/mpc.c new file mode 100644 index 0000000..b0f6f53 --- /dev/null +++ b/ffmpeg1/libavformat/mpc.c @@ -0,0 +1,237 @@ +/* + * Musepack demuxer + * Copyright (c) 2006 Konstantin Shishkov + * + * This file is part of FFmpeg. + * + * FFmpeg 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, + * 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 + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/channel_layout.h" +#include "libavcodec/get_bits.h" +#include "avformat.h" +#include "internal.h" +#include "apetag.h" +#include "id3v1.h" +#include "libavutil/dict.h" + +#define MPC_FRAMESIZE 1152 +#define DELAY_FRAMES 32 + +static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 }; +typedef struct { + int64_t pos; + int size, skip; +}MPCFrame; + +typedef struct { + int ver; + uint32_t curframe, lastframe; + uint32_t fcount; + MPCFrame *frames; + int curbits; + int frames_noted; +} MPCContext; + +static int mpc_probe(AVProbeData *p) +{ + const uint8_t *d = p->buf; + if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7)) + return AVPROBE_SCORE_MAX; + return 0; +} + +static int mpc_read_header(AVFormatContext *s) +{ + MPCContext *c = s->priv_data; + AVStream *st; + + if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){ + av_log(s, AV_LOG_ERROR, "Not a Musepack file\n"); + return AVERROR_INVALIDDATA; + } + c->ver = avio_r8(s->pb); + if(c->ver != 0x07 && c->ver != 0x17){ + av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver); + return AVERROR_INVALIDDATA; + } + c->fcount = avio_rl32(s->pb); + if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){ + av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n"); + return AVERROR_INVALIDDATA; + } + if(c->fcount){ + c->frames = av_malloc(c->fcount * sizeof(MPCFrame)); + if(!c->frames){ + av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n"); + return AVERROR(ENOMEM); + } + }else{ + av_log(s, AV_LOG_WARNING, "Container reports no frames\n"); + } + c->curframe = 0; + c->lastframe = -1; + c->curbits = 8; + c->frames_noted = 0; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = AV_CODEC_ID_MUSEPACK7; + st->codec->channels = 2; + st->codec->channel_layout = AV_CH_LAYOUT_STEREO; + st->codec->bits_per_coded_sample = 16; + + st->codec->extradata_size = 16; + st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE); + avio_read(s->pb, st->codec->extradata, 16); + st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3]; + avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate); + /* scan for seekpoints */ + st->start_time = 0; + st->duration = c->fcount; + + /* try to read APE tags */ + if (s->pb->seekable) { + int64_t pos = avio_tell(s->pb); + ff_ape_parse_tag(s); + if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) + ff_id3v1_read(s); + avio_seek(s->pb, pos, SEEK_SET); + } + + return 0; +} + +static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + MPCContext *c = s->priv_data; + int ret, size, size2, curbits, cur = c->curframe; + unsigned tmp; + int64_t pos; + + if (c->curframe >= c->fcount && c->fcount) + return AVERROR_EOF; + + if(c->curframe != c->lastframe + 1){ + avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET); + c->curbits = c->frames[c->curframe].skip; + } + c->lastframe = c->curframe; + c->curframe++; + curbits = c->curbits; + pos = avio_tell(s->pb); + tmp = avio_rl32(s->pb); + if(curbits <= 12){ + size2 = (tmp >> (12 - curbits)) & 0xFFFFF; + }else{ + size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF; + } + curbits += 20; + avio_seek(s->pb, pos, SEEK_SET); + + size = ((size2 + curbits + 31) & ~31) >> 3; + if(cur == c->frames_noted && c->fcount){ + c->frames[cur].pos = pos; + c->frames[cur].size = size; + c->frames[cur].skip = curbits - 20; + av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME); + c->frames_noted++; + } + c->curbits = (curbits + size2) & 0x1F; + + if ((ret = av_new_packet(pkt, size)) < 0) + return ret; + + pkt->data[0] = curbits; + pkt->data[1] = (c->curframe > c->fcount) && c->fcount; + pkt->data[2] = 0; + pkt->data[3] = 0; + + pkt->stream_index = 0; + pkt->pts = cur; + ret = avio_read(s->pb, pkt->data + 4, size); + if(c->curbits) + avio_seek(s->pb, -4, SEEK_CUR); + if(ret < size){ + av_free_packet(pkt); + return ret < 0 ? ret : AVERROR(EIO); + } + pkt->size = ret + 4; + + return 0; +} + +static int mpc_read_close(AVFormatContext *s) +{ + MPCContext *c = s->priv_data; + + av_freep(&c->frames); + return 0; +} + +/** + * Seek to the given position + * If position is unknown but is within the limits of file + * then packets are skipped unless desired position is reached + * + * Also this function makes use of the fact that timestamp == frameno + */ +static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) +{ + AVStream *st = s->streams[stream_index]; + MPCContext *c = s->priv_data; + AVPacket pkt1, *pkt = &pkt1; + int ret; + int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags); + uint32_t lastframe; + + /* if found, seek there */ + if (index >= 0 && st->index_entries[st->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES){ + c->curframe = st->index_entries[index].pos; + return 0; + } + /* if timestamp is out of bounds, return error */ + if(timestamp < 0 || timestamp >= c->fcount) + return -1; + timestamp -= DELAY_FRAMES; + /* seek to the furthest known position and read packets until + we reach desired position */ + lastframe = c->curframe; + if(c->frames_noted) c->curframe = c->frames_noted - 1; + while(c->curframe < timestamp){ + ret = av_read_frame(s, pkt); + if (ret < 0){ + c->curframe = lastframe; + return ret; + } + av_free_packet(pkt); + } + return 0; +} + + +AVInputFormat ff_mpc_demuxer = { + .name = "mpc", + .long_name = NULL_IF_CONFIG_SMALL("Musepack"), + .priv_data_size = sizeof(MPCContext), + .read_probe = mpc_probe, + .read_header = mpc_read_header, + .read_packet = mpc_read_packet, + .read_close = mpc_read_close, + .read_seek = mpc_read_seek, + .extensions = "mpc", +}; -- cgit v1.2.3