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-rw-r--r--libavformat/voc_packet.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/libavformat/voc_packet.c b/libavformat/voc_packet.c
new file mode 100644
index 0000000000..f4b82312f7
--- /dev/null
+++ b/libavformat/voc_packet.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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"
+#include "voc.h"
+
+int
+ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
+{
+ VocDecContext *voc = s->priv_data;
+ AVCodecContext *dec = st->codec;
+ AVIOContext *pb = s->pb;
+ VocType type;
+ int size, tmp_codec=-1;
+ int sample_rate = 0;
+ int channels = 1;
+ int64_t duration;
+ int ret;
+
+ av_add_index_entry(st,
+ avio_tell(pb),
+ voc->pts,
+ voc->remaining_size,
+ 0,
+ AVINDEX_KEYFRAME);
+
+ while (!voc->remaining_size) {
+ type = avio_r8(pb);
+ if (type == VOC_TYPE_EOF)
+ return AVERROR_EOF;
+ voc->remaining_size = avio_rl24(pb);
+ if (!voc->remaining_size) {
+ if (!s->pb->seekable)
+ return AVERROR(EIO);
+ voc->remaining_size = avio_size(pb) - avio_tell(pb);
+ }
+ max_size -= 4;
+
+ switch (type) {
+ case VOC_TYPE_VOICE_DATA:
+ if (!dec->sample_rate) {
+ dec->sample_rate = 1000000 / (256 - avio_r8(pb));
+ if (sample_rate)
+ dec->sample_rate = sample_rate;
+ avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
+ dec->channels = channels;
+ dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id);
+ } else
+ avio_skip(pb, 1);
+ tmp_codec = avio_r8(pb);
+ voc->remaining_size -= 2;
+ max_size -= 2;
+ channels = 1;
+ break;
+
+ case VOC_TYPE_VOICE_DATA_CONT:
+ break;
+
+ case VOC_TYPE_EXTENDED:
+ sample_rate = avio_rl16(pb);
+ avio_r8(pb);
+ channels = avio_r8(pb) + 1;
+ sample_rate = 256000000 / (channels * (65536 - sample_rate));
+ voc->remaining_size = 0;
+ max_size -= 4;
+ break;
+
+ case VOC_TYPE_NEW_VOICE_DATA:
+ if (!dec->sample_rate) {
+ dec->sample_rate = avio_rl32(pb);
+ avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
+ dec->bits_per_coded_sample = avio_r8(pb);
+ dec->channels = avio_r8(pb);
+ } else
+ avio_skip(pb, 6);
+ tmp_codec = avio_rl16(pb);
+ avio_skip(pb, 4);
+ voc->remaining_size -= 12;
+ max_size -= 12;
+ break;
+
+ default:
+ avio_skip(pb, voc->remaining_size);
+ max_size -= voc->remaining_size;
+ voc->remaining_size = 0;
+ break;
+ }
+ }
+
+ if (tmp_codec >= 0) {
+ tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
+ if (dec->codec_id == AV_CODEC_ID_NONE)
+ dec->codec_id = tmp_codec;
+ else if (dec->codec_id != tmp_codec)
+ av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
+ if (dec->codec_id == AV_CODEC_ID_NONE) {
+ if (s->audio_codec_id == AV_CODEC_ID_NONE) {
+ av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
+ return AVERROR(EINVAL);
+ }
+ av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
+ }
+ }
+
+ dec->bit_rate = dec->sample_rate * dec->channels * dec->bits_per_coded_sample;
+
+ if (max_size <= 0)
+ max_size = 2048;
+ size = FFMIN(voc->remaining_size, max_size);
+ voc->remaining_size -= size;
+
+ ret = av_get_packet(pb, pkt, size);
+ pkt->dts = pkt->pts = voc->pts;
+
+ duration = av_get_audio_frame_duration(st->codec, size);
+ if (duration > 0 && voc->pts != AV_NOPTS_VALUE)
+ voc->pts += duration;
+ else
+ voc->pts = AV_NOPTS_VALUE;
+
+ return ret;
+}