ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavformat/adxdec.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2011 Justin Ruggles
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * CRI ADX demuxer
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define BLOCK_SIZE    18
+#define BLOCK_SAMPLES 32
+
+typedef struct ADXDemuxerContext {
+    int header_size;
+} ADXDemuxerContext;
+
+static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ADXDemuxerContext *c = s->priv_data;
+    AVCodecContext *avctx = s->streams[0]->codec;
+    int ret, size;
+
+    if (avctx->channels <= 0) {
+        av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", avctx->channels);
+        return AVERROR_INVALIDDATA;
+    }
+
+    size = BLOCK_SIZE * avctx->channels;
+
+    pkt->pos = avio_tell(s->pb);
+    pkt->stream_index = 0;
+
+    ret = av_get_packet(s->pb, pkt, size);
+    if (ret != size) {
+        av_free_packet(pkt);
+        return ret < 0 ? ret : AVERROR(EIO);
+    }
+    if (AV_RB16(pkt->data) & 0x8000) {
+        av_free_packet(pkt);
+        return AVERROR_EOF;
+    }
+    pkt->size     = size;
+    pkt->duration = 1;
+    pkt->pts      = (pkt->pos - c->header_size) / size;
+
+    return 0;
+}
+
+static int adx_read_header(AVFormatContext *s)
+{
+    ADXDemuxerContext *c = s->priv_data;
+    AVCodecContext *avctx;
+
+    AVStream *st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    avctx = s->streams[0]->codec;
+
+    if (avio_rb16(s->pb) != 0x8000)
+        return AVERROR_INVALIDDATA;
+    c->header_size = avio_rb16(s->pb) + 4;
+    avio_seek(s->pb, -4, SEEK_CUR);
+
+    if (ff_get_extradata(avctx, s->pb, c->header_size) < 0)
+        return AVERROR(ENOMEM);
+
+    if (avctx->extradata_size < 12) {
+        av_log(s, AV_LOG_ERROR, "Invalid extradata size.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    avctx->channels    = AV_RB8(avctx->extradata + 7);
+    avctx->sample_rate = AV_RB32(avctx->extradata + 8);
+
+    if (avctx->channels <= 0) {
+        av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", avctx->channels);
+        return AVERROR_INVALIDDATA;
+    }
+
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id    = s->iformat->raw_codec_id;
+
+    avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
+
+    return 0;
+}
+
+AVInputFormat ff_adx_demuxer = {
+    .name           = "adx",
+    .long_name      = NULL_IF_CONFIG_SMALL("CRI ADX"),
+    .priv_data_size = sizeof(ADXDemuxerContext),
+    .read_header    = adx_read_header,
+    .read_packet    = adx_read_packet,
+    .extensions     = "adx",
+    .raw_codec_id   = AV_CODEC_ID_ADPCM_ADX,
+    .flags          = AVFMT_GENERIC_INDEX,
+};