Paul B Mahol
10 years ago
parent
8b11e43799
commit
af70117c38
4 changed files with 183 additions and 1 deletions
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/*
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* GENH demuxer |
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* Copyright (c) 2015 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/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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typedef struct GENHDemuxContext { |
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unsigned dsp_int_type; |
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unsigned interleave_size; |
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} GENHDemuxContext; |
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static int genh_probe(AVProbeData *p) |
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{ |
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if (AV_RL32(p->buf) != MKTAG('G','E','N','H')) |
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return 0; |
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return AVPROBE_SCORE_MAX / 3 * 2; |
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} |
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static int genh_read_header(AVFormatContext *s) |
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{ |
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unsigned start_offset, header_size, codec, coef_type, coef[2]; |
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GENHDemuxContext *c = s->priv_data; |
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unsigned coef_splitted[2]; |
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int align, ch; |
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AVStream *st; |
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avio_skip(s->pb, 4); |
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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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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->channels = avio_rl32(s->pb); |
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if (st->codec->channels <= 0) |
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return AVERROR_INVALIDDATA; |
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if (st->codec->channels == 1) |
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st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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else if (st->codec->channels == 2) |
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st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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align = |
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c->interleave_size = avio_rl32(s->pb); |
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if (align < 0 || align > INT_MAX / st->codec->channels) |
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return AVERROR_INVALIDDATA; |
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st->codec->block_align = align * st->codec->channels; |
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st->codec->sample_rate = avio_rl32(s->pb); |
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avio_skip(s->pb, 4); |
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st->duration = avio_rl32(s->pb); |
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codec = avio_rl32(s->pb); |
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switch (codec) { |
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case 0: st->codec->codec_id = AV_CODEC_ID_ADPCM_PSX; break; |
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case 1: |
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case 11: st->codec->bits_per_coded_sample = 4; |
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st->codec->block_align = 36 * st->codec->channels; |
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st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break; |
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case 2: st->codec->codec_id = AV_CODEC_ID_ADPCM_DTK; break; |
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case 3: st->codec->codec_id = st->codec->block_align > 0 ? |
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AV_CODEC_ID_PCM_S16BE_PLANAR : |
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AV_CODEC_ID_PCM_S16BE; break; |
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case 4: st->codec->codec_id = st->codec->block_align > 0 ? |
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AV_CODEC_ID_PCM_S16LE_PLANAR : |
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AV_CODEC_ID_PCM_S16LE; break; |
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case 5: st->codec->codec_id = st->codec->block_align > 0 ? |
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AV_CODEC_ID_PCM_S8_PLANAR : |
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AV_CODEC_ID_PCM_S8; break; |
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case 12: st->codec->codec_id = AV_CODEC_ID_ADPCM_THP; break; |
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case 13: st->codec->codec_id = AV_CODEC_ID_PCM_U8; break; |
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case 17: st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break; |
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default: |
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avpriv_request_sample(s, "codec %d", codec); |
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return AVERROR_PATCHWELCOME; |
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} |
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start_offset = avio_rl32(s->pb); |
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header_size = avio_rl32(s->pb); |
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if (header_size > start_offset) |
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return AVERROR_INVALIDDATA; |
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if (header_size == 0) |
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start_offset = 0x800; |
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coef[0] = avio_rl32(s->pb); |
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coef[1] = avio_rl32(s->pb); |
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c->dsp_int_type = avio_rl32(s->pb); |
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coef_type = avio_rl32(s->pb); |
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coef_splitted[0] = avio_rl32(s->pb); |
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coef_splitted[1] = avio_rl32(s->pb); |
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if (st->codec->codec_id == AV_CODEC_ID_ADPCM_THP) { |
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if (st->codec->channels > 2) { |
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avpriv_request_sample(s, "channels %d>2", st->codec->channels); |
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return AVERROR_PATCHWELCOME; |
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} |
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ff_alloc_extradata(st->codec, 32 * st->codec->channels); |
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for (ch = 0; ch < st->codec->channels; ch++) { |
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if (coef_type & 1) { |
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avpriv_request_sample(s, "coef_type & 1"); |
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return AVERROR_PATCHWELCOME; |
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} else { |
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avio_seek(s->pb, coef[ch], SEEK_SET); |
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avio_read(s->pb, st->codec->extradata + 32 * ch, 32); |
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} |
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} |
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if (c->dsp_int_type == 1) { |
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st->codec->block_align = 8 * st->codec->channels; |
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if (c->interleave_size != 1 && |
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c->interleave_size != 2 && |
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c->interleave_size != 4) |
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return AVERROR_INVALIDDATA; |
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} |
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} |
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avio_skip(s->pb, start_offset - avio_tell(s->pb)); |
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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return 0; |
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} |
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static int genh_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVCodecContext *codec = s->streams[0]->codec; |
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GENHDemuxContext *c = s->priv_data; |
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int ret; |
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if (c->dsp_int_type == 1 && codec->codec_id == AV_CODEC_ID_ADPCM_THP && |
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codec->channels > 1) { |
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int i, ch; |
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if (avio_feof(s->pb)) |
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return AVERROR_EOF; |
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av_new_packet(pkt, 8 * codec->channels); |
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for (i = 0; i < 8 / c->interleave_size; i++) { |
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for (ch = 0; ch < codec->channels; ch++) { |
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pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb); |
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pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb); |
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} |
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} |
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ret = 0; |
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} else { |
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ret = av_get_packet(s->pb, pkt, codec->block_align ? codec->block_align : 1024 * codec->channels); |
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} |
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pkt->stream_index = 0; |
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return ret; |
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} |
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AVInputFormat ff_genh_demuxer = { |
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.name = "genh", |
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.long_name = NULL_IF_CONFIG_SMALL("GENeric Header"), |
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.priv_data_size = sizeof(GENHDemuxContext), |
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.read_probe = genh_probe, |
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.read_header = genh_read_header, |
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.read_packet = genh_read_packet, |
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.extensions = "genh", |
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}; |
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