voc: Split ff_voc_get_packet into a separate file

1 files changed, 119 insertions, 0 deletions

diff --git a/libavformat/voc_packet.c b/libavformat/voc_packet.c
new file mode 100644
index 0000000000..9e1c7469da
--- /dev/null
+++ b/libavformat/voc_packet.c
@@ -0,0 +1,119 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#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;
+
+    while (!voc->remaining_size) {
+        type = avio_r8(pb);
+        if (type == VOC_TYPE_EOF)
+            return AVERROR(EIO);
+        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->bits_per_coded_sample;
+
+    if (max_size <= 0)
+        max_size = 2048;
+    size = FFMIN(voc->remaining_size, max_size);
+    voc->remaining_size -= size;
+    return av_get_packet(pb, pkt, size);
+}