193 lines
6.6 KiB
C
193 lines
6.6 KiB
C
/*
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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, ret;
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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 6: st->codec->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
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case 7: ret = ff_alloc_extradata(st->codec, 2);
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if (ret < 0)
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return ret;
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AV_WL16(st->codec->extradata, 3);
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st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
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case 10: st->codec->codec_id = AV_CODEC_ID_ADPCM_AICA; 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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ret = av_new_packet(pkt, 8 * codec->channels);
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if (ret < 0)
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return ret;
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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 if (codec->codec_id == AV_CODEC_ID_SDX2_DPCM) {
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ret = av_get_packet(s->pb, pkt, codec->block_align * 1024);
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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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