| /* |
| * GENH demuxer |
| * Copyright (c) 2015 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| typedef struct GENHDemuxContext { |
| unsigned dsp_int_type; |
| unsigned interleave_size; |
| } GENHDemuxContext; |
| |
| static int genh_probe(AVProbeData *p) |
| { |
| if (AV_RL32(p->buf) != MKTAG('G','E','N','H')) |
| return 0; |
| if (AV_RL32(p->buf+4) <= 0 || AV_RL32(p->buf+4) > 0xFFFF) // channels |
| return 0; |
| |
| return AVPROBE_SCORE_MAX / 3 * 2; |
| } |
| |
| static int genh_read_header(AVFormatContext *s) |
| { |
| unsigned start_offset, header_size, codec, coef_type, coef[2]; |
| GENHDemuxContext *c = s->priv_data; |
| av_unused unsigned coef_splitted[2]; |
| int align, ch, ret; |
| AVStream *st; |
| |
| avio_skip(s->pb, 4); |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->channels = avio_rl32(s->pb); |
| if (st->codec->channels <= 0) |
| return AVERROR_INVALIDDATA; |
| if (st->codec->channels == 1) |
| st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| else if (st->codec->channels == 2) |
| st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
| align = |
| c->interleave_size = avio_rl32(s->pb); |
| if (align < 0 || align > INT_MAX / st->codec->channels) |
| return AVERROR_INVALIDDATA; |
| st->codec->block_align = align * st->codec->channels; |
| st->codec->sample_rate = avio_rl32(s->pb); |
| avio_skip(s->pb, 4); |
| st->duration = avio_rl32(s->pb); |
| |
| codec = avio_rl32(s->pb); |
| switch (codec) { |
| case 0: st->codec->codec_id = AV_CODEC_ID_ADPCM_PSX; break; |
| case 1: |
| case 11: st->codec->bits_per_coded_sample = 4; |
| st->codec->block_align = 36 * st->codec->channels; |
| st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break; |
| case 2: st->codec->codec_id = AV_CODEC_ID_ADPCM_DTK; break; |
| case 3: st->codec->codec_id = st->codec->block_align > 0 ? |
| AV_CODEC_ID_PCM_S16BE_PLANAR : |
| AV_CODEC_ID_PCM_S16BE; break; |
| case 4: st->codec->codec_id = st->codec->block_align > 0 ? |
| AV_CODEC_ID_PCM_S16LE_PLANAR : |
| AV_CODEC_ID_PCM_S16LE; break; |
| case 5: st->codec->codec_id = st->codec->block_align > 0 ? |
| AV_CODEC_ID_PCM_S8_PLANAR : |
| AV_CODEC_ID_PCM_S8; break; |
| case 6: st->codec->codec_id = AV_CODEC_ID_SDX2_DPCM; break; |
| case 7: ret = ff_alloc_extradata(st->codec, 2); |
| if (ret < 0) |
| return ret; |
| AV_WL16(st->codec->extradata, 3); |
| st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break; |
| case 10: st->codec->codec_id = AV_CODEC_ID_ADPCM_AICA; break; |
| case 12: st->codec->codec_id = AV_CODEC_ID_ADPCM_THP; break; |
| case 13: st->codec->codec_id = AV_CODEC_ID_PCM_U8; break; |
| case 17: st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break; |
| default: |
| avpriv_request_sample(s, "codec %d", codec); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| start_offset = avio_rl32(s->pb); |
| header_size = avio_rl32(s->pb); |
| |
| if (header_size > start_offset) |
| return AVERROR_INVALIDDATA; |
| |
| if (header_size == 0) |
| start_offset = 0x800; |
| |
| coef[0] = avio_rl32(s->pb); |
| coef[1] = avio_rl32(s->pb); |
| c->dsp_int_type = avio_rl32(s->pb); |
| coef_type = avio_rl32(s->pb); |
| coef_splitted[0] = avio_rl32(s->pb); |
| coef_splitted[1] = avio_rl32(s->pb); |
| |
| if (st->codec->codec_id == AV_CODEC_ID_ADPCM_THP) { |
| if (st->codec->channels > 2) { |
| avpriv_request_sample(s, "channels %d>2", st->codec->channels); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| ff_alloc_extradata(st->codec, 32 * st->codec->channels); |
| for (ch = 0; ch < st->codec->channels; ch++) { |
| if (coef_type & 1) { |
| avpriv_request_sample(s, "coef_type & 1"); |
| return AVERROR_PATCHWELCOME; |
| } else { |
| avio_seek(s->pb, coef[ch], SEEK_SET); |
| avio_read(s->pb, st->codec->extradata + 32 * ch, 32); |
| } |
| } |
| |
| if (c->dsp_int_type == 1) { |
| st->codec->block_align = 8 * st->codec->channels; |
| if (c->interleave_size != 1 && |
| c->interleave_size != 2 && |
| c->interleave_size != 4) |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| avio_skip(s->pb, start_offset - avio_tell(s->pb)); |
| |
| avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| |
| return 0; |
| } |
| |
| static int genh_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AVCodecContext *codec = s->streams[0]->codec; |
| GENHDemuxContext *c = s->priv_data; |
| int ret; |
| |
| if (c->dsp_int_type == 1 && codec->codec_id == AV_CODEC_ID_ADPCM_THP && |
| codec->channels > 1) { |
| int i, ch; |
| |
| if (avio_feof(s->pb)) |
| return AVERROR_EOF; |
| ret = av_new_packet(pkt, 8 * codec->channels); |
| if (ret < 0) |
| return ret; |
| for (i = 0; i < 8 / c->interleave_size; i++) { |
| for (ch = 0; ch < codec->channels; ch++) { |
| pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb); |
| pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb); |
| } |
| } |
| ret = 0; |
| } else if (codec->codec_id == AV_CODEC_ID_SDX2_DPCM) { |
| ret = av_get_packet(s->pb, pkt, codec->block_align * 1024); |
| |
| } else { |
| ret = av_get_packet(s->pb, pkt, codec->block_align ? codec->block_align : 1024 * codec->channels); |
| } |
| |
| pkt->stream_index = 0; |
| return ret; |
| } |
| |
| AVInputFormat ff_genh_demuxer = { |
| .name = "genh", |
| .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"), |
| .priv_data_size = sizeof(GENHDemuxContext), |
| .read_probe = genh_probe, |
| .read_header = genh_read_header, |
| .read_packet = genh_read_packet, |
| .extensions = "genh", |
| }; |
