mirror of https://github.com/FFmpeg/FFmpeg.git
Adds support for the APM file format used by Ubisoft's Rayman 2. Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>pull/334/head
Zane van Iperen
5 years ago
committed by
Paul B Mahol
parent
af65357207
commit
55af03dbb5
5 changed files with 194 additions and 2 deletions
@ -0,0 +1,188 @@ |
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/*
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* Rayman 2 APM Demuxer |
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* |
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* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com) |
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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 "avformat.h" |
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#include "internal.h" |
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#include "riff.h" |
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#include "libavutil/internal.h" |
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#include "libavutil/intreadwrite.h" |
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#define APM_FILE_HEADER_SIZE 20 |
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#define APM_VS12_CHUNK_SIZE 76 |
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#define APM_MAX_READ_SIZE 4096 |
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#define APM_TAG_VS12 MKTAG('v', 's', '1', '2') |
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#define APM_TAG_DATA MKTAG('D', 'A', 'T', 'A') |
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typedef struct APMState { |
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int32_t has_saved; |
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int32_t predictor_r; |
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int32_t step_index_r; |
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int32_t saved_r; |
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int32_t predictor_l; |
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int32_t step_index_l; |
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int32_t saved_l; |
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} APMState; |
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typedef struct APMVS12Chunk { |
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uint32_t magic; |
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uint32_t file_size; |
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uint32_t data_size; |
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uint32_t unk1; |
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uint32_t unk2; |
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APMState state; |
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uint32_t pad[7]; |
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} APMVS12Chunk; |
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static void apm_parse_vs12(APMVS12Chunk *vs12, const uint8_t *buf) |
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{ |
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vs12->magic = AV_RL32(buf + 0); |
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vs12->file_size = AV_RL32(buf + 4); |
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vs12->data_size = AV_RL32(buf + 8); |
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vs12->unk1 = AV_RL32(buf + 12); |
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vs12->unk2 = AV_RL32(buf + 16); |
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vs12->state.has_saved = AV_RL32(buf + 20); |
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vs12->state.predictor_r = AV_RL32(buf + 24); |
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vs12->state.step_index_r = AV_RL32(buf + 28); |
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vs12->state.saved_r = AV_RL32(buf + 32); |
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vs12->state.predictor_l = AV_RL32(buf + 36); |
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vs12->state.step_index_l = AV_RL32(buf + 40); |
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vs12->state.saved_l = AV_RL32(buf + 44); |
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for (int i = 0; i < FF_ARRAY_ELEMS(vs12->pad); i++) |
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vs12->pad[i] = AV_RL32(buf + 48 + (i * 4)); |
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} |
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static int apm_probe(const AVProbeData *p) |
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{ |
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if (p->buf_size < 100) |
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return 0; |
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if (AV_RL32(p->buf + 20) != APM_TAG_VS12) |
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return 0; |
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if (AV_RL32(p->buf + 96) != APM_TAG_DATA) |
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return 0; |
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return AVPROBE_SCORE_MAX - 1; |
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} |
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static int apm_read_header(AVFormatContext *s) |
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{ |
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int64_t ret; |
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AVStream *st; |
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APMVS12Chunk vs12; |
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uint8_t buf[APM_VS12_CHUNK_SIZE]; |
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if (!(st = avformat_new_stream(s, NULL))) |
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return AVERROR(ENOMEM); |
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/* The header starts with a WAVEFORMATEX */ |
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if ((ret = ff_get_wav_header(s, s->pb, st->codecpar, APM_FILE_HEADER_SIZE, 0)) < 0) |
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return ret; |
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if (st->codecpar->bits_per_coded_sample != 4) |
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return AVERROR_INVALIDDATA; |
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if (st->codecpar->codec_tag != 0x2000) |
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return AVERROR_INVALIDDATA; |
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/* ff_get_wav_header() does most of the work, but we need to fix a few things. */ |
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APM; |
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st->codecpar->codec_tag = 0; |
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if (st->codecpar->channels == 2) |
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st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
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else if (st->codecpar->channels == 1) |
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
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else |
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return AVERROR_INVALIDDATA; |
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st->codecpar->format = AV_SAMPLE_FMT_S16; |
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st->codecpar->bits_per_raw_sample = 16; |
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st->codecpar->bit_rate = st->codecpar->channels * |
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st->codecpar->sample_rate * |
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st->codecpar->bits_per_coded_sample; |
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if ((ret = avio_read(s->pb, buf, APM_VS12_CHUNK_SIZE)) < 0) |
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return ret; |
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else if (ret != APM_VS12_CHUNK_SIZE) |
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return AVERROR(EIO); |
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apm_parse_vs12(&vs12, buf); |
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if (vs12.magic != APM_TAG_VS12) { |
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return AVERROR_INVALIDDATA; |
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} |
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if (vs12.state.has_saved) { |
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avpriv_request_sample(s, "Saved Samples"); |
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return AVERROR_PATCHWELCOME; |
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} |
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if (avio_rl32(s->pb) != APM_TAG_DATA) |
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return AVERROR_INVALIDDATA; |
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if ((ret = ff_alloc_extradata(st->codecpar, 16)) < 0) |
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return ret; |
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AV_WL32(st->codecpar->extradata + 0, vs12.state.predictor_l); |
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AV_WL32(st->codecpar->extradata + 4, vs12.state.step_index_l); |
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AV_WL32(st->codecpar->extradata + 8, vs12.state.predictor_r); |
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AV_WL32(st->codecpar->extradata + 12, vs12.state.step_index_r); |
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
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st->start_time = 0; |
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st->duration = vs12.data_size * |
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(8 / st->codecpar->bits_per_coded_sample) / |
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st->codecpar->channels; |
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return 0; |
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} |
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static int apm_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int ret; |
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AVCodecParameters *par = s->streams[0]->codecpar; |
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/*
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* For future reference: if files with the `has_saved` field set ever |
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* surface, `saved_l`, and `saved_r` will each contain 8 "saved" samples |
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* that should be sent to the decoder before the actual data. |
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*/ |
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if ((ret = av_get_packet(s->pb, pkt, APM_MAX_READ_SIZE)) < 0) |
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return ret; |
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
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pkt->stream_index = 0; |
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pkt->duration = ret * (8 / par->bits_per_coded_sample) / par->channels; |
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return 0; |
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} |
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AVInputFormat ff_apm_demuxer = { |
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.name = "apm", |
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.long_name = NULL_IF_CONFIG_SMALL("Ubisoft Rayman 2 APM"), |
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.read_probe = apm_probe, |
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.read_header = apm_read_header, |
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.read_packet = apm_read_packet |
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}; |
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