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-rw-r--r--libavformat/genh.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/libavformat/genh.c b/libavformat/genh.c
new file mode 100644
index 0000000000..dd4e76d3d9
--- /dev/null
+++ b/libavformat/genh.c
@@ -0,0 +1,195 @@
+/*
+ * 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 "libavcodec/internal.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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->channels = avio_rl32(s->pb);
+ if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS)
+ return AVERROR_INVALIDDATA;
+ if (st->codecpar->channels == 1)
+ st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
+ else if (st->codecpar->channels == 2)
+ st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
+ align =
+ c->interleave_size = avio_rl32(s->pb);
+ if (align < 0 || align > INT_MAX / st->codecpar->channels)
+ return AVERROR_INVALIDDATA;
+ st->codecpar->block_align = align * st->codecpar->channels;
+ st->codecpar->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->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;
+ case 1:
+ case 11: st->codecpar->bits_per_coded_sample = 4;
+ st->codecpar->block_align = 36 * st->codecpar->channels;
+ st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break;
+ case 2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; break;
+ case 3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
+ AV_CODEC_ID_PCM_S16BE_PLANAR :
+ AV_CODEC_ID_PCM_S16BE; break;
+ case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
+ AV_CODEC_ID_PCM_S16LE_PLANAR :
+ AV_CODEC_ID_PCM_S16LE; break;
+ case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
+ AV_CODEC_ID_PCM_S8_PLANAR :
+ AV_CODEC_ID_PCM_S8; break;
+ case 6: st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
+ case 7: ret = ff_alloc_extradata(st->codecpar, 2);
+ if (ret < 0)
+ return ret;
+ AV_WL16(st->codecpar->extradata, 3);
+ st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
+ case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
+ case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
+ case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
+ case 17: st->codecpar->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->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
+ if (st->codecpar->channels > 2) {
+ avpriv_request_sample(s, "channels %d>2", st->codecpar->channels);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ ff_alloc_extradata(st->codecpar, 32 * st->codecpar->channels);
+ for (ch = 0; ch < st->codecpar->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->codecpar->extradata + 32 * ch, 32);
+ }
+ }
+
+ if (c->dsp_int_type == 1) {
+ st->codecpar->block_align = 8 * st->codecpar->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->codecpar->sample_rate);
+
+ return 0;
+}
+
+static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ AVCodecParameters *par = s->streams[0]->codecpar;
+ GENHDemuxContext *c = s->priv_data;
+ int ret;
+
+ if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
+ par->channels > 1) {
+ int i, ch;
+
+ if (avio_feof(s->pb))
+ return AVERROR_EOF;
+ ret = av_new_packet(pkt, 8 * par->channels);
+ if (ret < 0)
+ return ret;
+ for (i = 0; i < 8 / c->interleave_size; i++) {
+ for (ch = 0; ch < par->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 (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
+ ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
+
+ } else {
+ ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->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",
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-28 11:05:18 +0000