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Diffstat (limited to 'ffmpeg/libavformat/xa.c')
| -rw-r--r-- | ffmpeg/libavformat/xa.c | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/ffmpeg/libavformat/xa.c b/ffmpeg/libavformat/xa.c deleted file mode 100644 index 43661de..0000000 --- a/ffmpeg/libavformat/xa.c +++ /dev/null @@ -1,131 +0,0 @@ -/* - * Maxis XA (.xa) File Demuxer - * Copyright (c) 2008 Robert Marston - * - * 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 - */ - -/** - * @file - * Maxis XA File Demuxer - * by Robert Marston (rmarston@gmail.com) - * for more information on the XA audio format see - * http://wiki.multimedia.cx/index.php?title=Maxis_XA - */ - -#include "libavutil/intreadwrite.h" -#include "avformat.h" -#include "internal.h" - -#define XA00_TAG MKTAG('X', 'A', 0, 0) -#define XAI0_TAG MKTAG('X', 'A', 'I', 0) -#define XAJ0_TAG MKTAG('X', 'A', 'J', 0) - -typedef struct MaxisXADemuxContext { - uint32_t out_size; - uint32_t sent_bytes; -} MaxisXADemuxContext; - -static int xa_probe(AVProbeData *p) -{ - int channels, srate, bits_per_sample; - if (p->buf_size < 24) - return 0; - switch(AV_RL32(p->buf)) { - case XA00_TAG: - case XAI0_TAG: - case XAJ0_TAG: - break; - default: - return 0; - } - channels = AV_RL16(p->buf + 10); - srate = AV_RL32(p->buf + 12); - bits_per_sample = AV_RL16(p->buf + 22); - if (!channels || channels > 8 || !srate || srate > 192000 || - bits_per_sample < 4 || bits_per_sample > 32) - return 0; - return AVPROBE_SCORE_EXTENSION; -} - -static int xa_read_header(AVFormatContext *s) -{ - MaxisXADemuxContext *xa = s->priv_data; - AVIOContext *pb = s->pb; - AVStream *st; - - /*Set up the XA Audio Decoder*/ - 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_ADPCM_EA_MAXIS_XA; - avio_skip(pb, 4); /* Skip the XA ID */ - xa->out_size = avio_rl32(pb); - avio_skip(pb, 2); /* Skip the tag */ - st->codec->channels = avio_rl16(pb); - st->codec->sample_rate = avio_rl32(pb); - avio_skip(pb, 4); /* Skip average byte rate */ - avio_skip(pb, 2); /* Skip block align */ - avio_skip(pb, 2); /* Skip bits-per-sample */ - - if (!st->codec->channels || !st->codec->sample_rate) - return AVERROR_INVALIDDATA; - - st->codec->bit_rate = av_clip(15LL * st->codec->channels * 8 * - st->codec->sample_rate / 28, 0, INT_MAX); - - avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); - st->start_time = 0; - - return 0; -} - -static int xa_read_packet(AVFormatContext *s, - AVPacket *pkt) -{ - MaxisXADemuxContext *xa = s->priv_data; - AVStream *st = s->streams[0]; - AVIOContext *pb = s->pb; - unsigned int packet_size; - int ret; - - if (xa->sent_bytes >= xa->out_size) - return AVERROR_EOF; - /* 1 byte header and 14 bytes worth of samples * number channels per block */ - packet_size = 15*st->codec->channels; - - ret = av_get_packet(pb, pkt, packet_size); - if(ret < 0) - return ret; - - pkt->stream_index = st->index; - xa->sent_bytes += packet_size; - pkt->duration = 28; - - return ret; -} - -AVInputFormat ff_xa_demuxer = { - .name = "xa", - .long_name = NULL_IF_CONFIG_SMALL("Maxis XA"), - .priv_data_size = sizeof(MaxisXADemuxContext), - .read_probe = xa_probe, - .read_header = xa_read_header, - .read_packet = xa_read_packet, -}; |