mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-28 20:26:14 +02:00
163 lines
4.5 KiB
C
163 lines
4.5 KiB
C
/*
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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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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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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(const 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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key = data ^ 0x52656453;
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data ^= key;
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AV_WB32(header, data);
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key = rol(key, 11);
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key += rol(key, 3);
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data = AV_RB32(p->buf + 4) ^ 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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AVCodecParameters *par;
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GetByteContext gbc;
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int i, coef_off, ret = 0;
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uint32_t key, data;
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uint8_t header[HEADER_SIZE];
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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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par = st->codecpar;
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/* Decrypt header */
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data = avio_rb32(pb);
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key = data ^ 0x52656453;
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data ^= key;
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AV_WB32(header, data);
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key = rol(key, 11);
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for (i = 4; i < HEADER_SIZE; i += 4) {
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key += rol(key, 3);
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data = avio_rb32(pb) ^ key;
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AV_WB32(header + i, data);
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}
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par->codec_id = AV_CODEC_ID_ADPCM_THP;
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par->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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par->sample_rate = bytestream2_get_be32u(&gbc);
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if (par->sample_rate <= 0 || par->sample_rate > 96000) {
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av_log(s, AV_LOG_ERROR, "Invalid sample rate: %d\n", par->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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par->channels = bytestream2_get_byteu(&gbc);
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if (!par->channels) {
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return AVERROR_INVALIDDATA;
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}
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coef_off = 0x54 + par->channels * 8;
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if (bytestream2_get_byteu(&gbc)) // Loop flag
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coef_off += 16;
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if (coef_off + par->channels * (32 + 14) > HEADER_SIZE) {
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return AVERROR_INVALIDDATA;
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}
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if (ff_alloc_extradata(par, 32 * par->channels)) {
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return AVERROR_INVALIDDATA;
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}
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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 < par->channels; i++) {
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if (bytestream2_get_bufferu(&gbc, par->extradata + i * 32, 32) != 32) {
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return AVERROR_INVALIDDATA;
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}
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bytestream2_skipu(&gbc, 14);
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}
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avpriv_set_pts_info(st, 64, 1, par->sample_rate);
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return ret;
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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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AVCodecParameters *par = s->streams[0]->codecpar;
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RedSparkContext *redspark = s->priv_data;
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uint32_t size = 8 * par->channels;
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int ret;
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if (avio_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_packet_unref(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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