mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
2 years ago
parent
b8c0802156
commit
a13210ab39
6 changed files with 178 additions and 2 deletions
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/*
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* RKA demuxer |
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* Copyright (c) 2023 Paul B Mahol |
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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/dict.h" |
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#include "libavutil/intreadwrite.h" |
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#include "apetag.h" |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "demux.h" |
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#include "internal.h" |
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typedef struct RKAContext { |
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int total_frames, currentframe; |
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int frame_size; |
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int last_frame_size; |
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} RKAContext; |
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static int rka_probe(const AVProbeData *p) |
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{ |
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if (AV_RL32(&p->buf[0]) == MKTAG('R', 'K', 'A', '7') && |
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AV_RL32(&p->buf[4]) > 0 && |
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AV_RL32(&p->buf[8]) > 0 && |
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p->buf[12] > 0 && |
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p->buf[12] <= 2 && |
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(p->buf[13] == 8 || p->buf[13] == 16) && |
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p->buf[15] & 2 != 0) |
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return AVPROBE_SCORE_EXTENSION + 30; |
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return 0; |
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} |
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static int rka_read_header(AVFormatContext *s) |
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{ |
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int64_t nb_samples, size_offset; |
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RKAContext *c = s->priv_data; |
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int channels, bps, samplerate; |
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AVCodecParameters *par; |
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int64_t framepos; |
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AVStream *st; |
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int ret; |
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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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ret = ff_get_extradata(s, par, s->pb, 16); |
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if (ret < 0) |
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return ret; |
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nb_samples = AV_RL32(par->extradata + 4); |
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samplerate = AV_RL32(par->extradata + 8); |
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channels = par->extradata[12]; |
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if (channels == 0) |
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return AVERROR_INVALIDDATA; |
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bps = par->extradata[13]; |
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if (bps == 0) |
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return AVERROR_INVALIDDATA; |
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size_offset = avio_rl32(s->pb); |
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framepos = avio_tell(s->pb); |
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c->frame_size = 131072; |
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avpriv_set_pts_info(st, 64, 1, samplerate); |
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st->start_time = 0; |
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avio_seek(s->pb, size_offset, SEEK_SET); |
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c->total_frames = (nb_samples + c->frame_size - 1) / c->frame_size; |
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c->last_frame_size = nb_samples % c->frame_size; |
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for (int i = 0; i < c->total_frames; i++) { |
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int r, end = 0; |
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int64_t size; |
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if (avio_feof(s->pb)) |
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break; |
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size = avio_rl24(s->pb); |
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if (size == 0) { |
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end = 1; |
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size = size_offset - framepos; |
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if (size <= 0) |
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break; |
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} |
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if ((r = av_add_index_entry(st, framepos, (i * 131072LL) / (channels * (bps >> 3)), |
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size, 0, AVINDEX_KEYFRAME)) < 0) |
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return r; |
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framepos += size; |
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if (end) |
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break; |
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} |
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par->codec_type = AVMEDIA_TYPE_AUDIO; |
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par->codec_id = AV_CODEC_ID_RKA; |
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par->ch_layout.nb_channels = channels; |
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par->sample_rate = samplerate; |
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par->bits_per_raw_sample = bps; |
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st->duration = nb_samples / (channels * (bps >> 3)); |
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if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) |
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ff_ape_parse_tag(s); |
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avio_seek(s->pb, 20, SEEK_SET); |
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return 0; |
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} |
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static int rka_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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RKAContext *c = s->priv_data; |
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AVStream *st = s->streams[0]; |
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FFStream *const sti = ffstream(st); |
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int size, ret; |
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if (avio_feof(s->pb)) |
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return AVERROR_EOF; |
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if (c->currentframe >= sti->nb_index_entries) |
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return AVERROR_EOF; |
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size = sti->index_entries[c->currentframe].size; |
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ret = av_get_packet(s->pb, pkt, size); |
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pkt->dts = sti->index_entries[c->currentframe++].timestamp; |
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pkt->duration = c->currentframe == c->total_frames ? c->last_frame_size : |
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131072; |
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return ret; |
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} |
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static int rka_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
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{ |
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RKAContext *c = s->priv_data; |
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AVStream *st = s->streams[stream_index]; |
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int index = av_index_search_timestamp(st, timestamp, flags); |
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if (index < 0) |
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return -1; |
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if (avio_seek(s->pb, ffstream(st)->index_entries[index].pos, SEEK_SET) < 0) |
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return -1; |
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c->currentframe = index; |
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return 0; |
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} |
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const AVInputFormat ff_rka_demuxer = { |
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.name = "rka", |
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.long_name = NULL_IF_CONFIG_SMALL("RKA (RK Audio)"), |
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.priv_data_size = sizeof(RKAContext), |
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.read_probe = rka_probe, |
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.read_header = rka_read_header, |
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.read_packet = rka_read_packet, |
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.read_seek = rka_read_seek, |
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.extensions = "rka", |
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}; |
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