mirror of https://github.com/FFmpeg/FFmpeg.git
James Almer
12 years ago
parent
d3710c51d9
commit
e5e86db178
8 changed files with 166 additions and 1 deletions
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/*
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* RedSpark demuxer |
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* Copyright (c) 2013 James Almer |
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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 "libavcodec/bytestream.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "avio.h" |
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#include "internal.h" |
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#define HEADER_SIZE 4096 |
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typedef struct RedSparkContext { |
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int samples_count; |
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} RedSparkContext; |
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static int redspark_probe(AVProbeData *p) |
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{ |
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uint32_t key, data; |
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uint8_t header[8]; |
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/* Decrypt first 8 bytes of the header */ |
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data = AV_RB32(p->buf); |
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data = data ^ (key = data ^ 0x52656453); |
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AV_WB32(header, data); |
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key = (key << 11) | (key >> 21); |
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data = AV_RB32(p->buf + 4) ^ (((key << 3) | (key >> 29)) + key); |
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AV_WB32(header + 4, data); |
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if (AV_RB64(header) == AV_RB64("RedSpark")) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int redspark_read_header(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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RedSparkContext *redspark = s->priv_data; |
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AVCodecContext *codec; |
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GetByteContext gbc; |
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int i, coef_off; |
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uint32_t key, data; |
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uint8_t *header, *pbc; |
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AVStream *st; |
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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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codec = st->codec; |
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header = av_malloc(HEADER_SIZE); |
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if (!header) |
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return AVERROR(ENOMEM); |
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pbc = header; |
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/* Decrypt header */ |
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data = avio_rb32(pb); |
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data = data ^ (key = data ^ 0x52656453); |
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bytestream_put_be32(&pbc, data); |
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key = (key << 11) | (key >> 21); |
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for (i = 4; i < HEADER_SIZE; i += 4) { |
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data = avio_rb32(pb) ^ (key = ((key << 3) | (key >> 29)) + key); |
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bytestream_put_be32(&pbc, data); |
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} |
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codec->codec_id = AV_CODEC_ID_ADPCM_THP; |
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codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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bytestream2_init(&gbc, header, HEADER_SIZE); |
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bytestream2_seek(&gbc, 0x3c, SEEK_SET); |
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codec->sample_rate = bytestream2_get_be32u(&gbc); |
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if (codec->sample_rate <= 0 || codec->sample_rate > 96000) { |
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av_log(s, AV_LOG_ERROR, "Invalid sample rate: %d\n", codec->sample_rate); |
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return AVERROR_INVALIDDATA; |
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} |
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st->duration = bytestream2_get_be32u(&gbc) * 14; |
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redspark->samples_count = 0; |
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bytestream2_skipu(&gbc, 10); |
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codec->channels = bytestream2_get_byteu(&gbc); |
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if (!codec->channels) |
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return AVERROR_INVALIDDATA; |
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coef_off = 0x54 + codec->channels * 8; |
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if (bytestream2_get_byteu(&gbc)) // Loop flag
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coef_off += 16; |
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codec->extradata_size = 32 * codec->channels; |
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codec->extradata = av_malloc(codec->extradata_size); |
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if (!codec->extradata) |
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return AVERROR(ENOMEM); |
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/* Get the ADPCM table */ |
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bytestream2_seek(&gbc, coef_off, SEEK_SET); |
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for (i = 0; i < codec->channels; i++) { |
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if (bytestream2_get_bufferu(&gbc, codec->extradata + i * 32, 32) != 32) |
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return AVERROR_INVALIDDATA; |
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bytestream2_skipu(&gbc, 14); |
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} |
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avpriv_set_pts_info(st, 64, 1, codec->sample_rate); |
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return 0; |
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} |
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static int redspark_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVCodecContext *codec = s->streams[0]->codec; |
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RedSparkContext *redspark = s->priv_data; |
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uint32_t size = 8 * codec->channels; |
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int ret; |
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if (url_feof(s->pb) || redspark->samples_count == s->streams[0]->duration) |
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return AVERROR_EOF; |
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ret = av_get_packet(s->pb, pkt, size); |
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if (ret != size) { |
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av_free_packet(pkt); |
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return AVERROR(EIO); |
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} |
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pkt->duration = 14; |
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redspark->samples_count += pkt->duration; |
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pkt->stream_index = 0; |
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return ret; |
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} |
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AVInputFormat ff_redspark_demuxer = { |
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.name = "redspark", |
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.long_name = NULL_IF_CONFIG_SMALL("RedSpark"), |
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.priv_data_size = sizeof(RedSparkContext), |
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.read_probe = redspark_probe, |
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.read_header = redspark_read_header, |
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.read_packet = redspark_read_packet, |
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.extensions = "rsd", |
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}; |
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@ -0,0 +1 @@ |
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CRC=0xc0fd1aa2 |
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