add SMJPEG muxer

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>

1 files changed, 149 insertions, 0 deletions

diff --git a/libavformat/smjpegenc.c b/libavformat/smjpegenc.c
new file mode 100644
index 0000000000..45ba20b643
--- /dev/null
+++ b/libavformat/smjpegenc.c
@@ -0,0 +1,149 @@
+/*
+ * SMJPEG muxer
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * This is a muxer for Loki SDL Motion JPEG files
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "riff.h"
+#include "smjpeg.h"
+
+typedef struct SMJPEGMuxContext {
+    uint32_t duration;
+} SMJPEGMuxContext;
+
+static int smjpeg_write_header(AVFormatContext *s)
+{
+    AVDictionaryEntry *t = NULL;
+    AVIOContext *pb = s->pb;
+    int n, tag;
+
+    if (s->nb_streams > 2) {
+        av_log(s, AV_LOG_ERROR, "more than >2 streams are not supported\n");
+        return AVERROR(EINVAL);
+    }
+    avio_write(pb, SMJPEG_MAGIC, 8);
+    avio_wb32(pb, 0);
+    avio_wb32(pb, 0);
+
+    while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
+        avio_wl32(pb, SMJPEG_TXT);
+        avio_wb32(pb, strlen(t->key) + strlen(t->value) + 3);
+        avio_write(pb, t->key, strlen(t->key));
+        avio_write(pb, " = ", 3);
+        avio_write(pb, t->value, strlen(t->value));
+    }
+
+    for (n = 0; n < s->nb_streams; n++) {
+        AVStream *st = s->streams[n];
+        AVCodecContext *codec = st->codec;
+        if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
+            tag = ff_codec_get_tag(ff_codec_smjpeg_audio_tags, codec->codec_id);
+            if (!tag) {
+                av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
+                return AVERROR(EINVAL);
+            }
+            avio_wl32(pb, SMJPEG_SND);
+            avio_wb32(pb, 8);
+            avio_wb16(pb, codec->sample_rate);
+            avio_w8(pb, av_get_bits_per_sample(codec->codec_id));
+            avio_w8(pb, codec->channels);
+            avio_wl32(pb, tag);
+            avpriv_set_pts_info(st, 32, 1, 1000);
+        } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
+            tag = ff_codec_get_tag(ff_codec_smjpeg_video_tags, codec->codec_id);
+            if (!tag) {
+                av_log(s, AV_LOG_ERROR, "unsupported video codec\n");
+                return AVERROR(EINVAL);
+            }
+            avio_wl32(pb, SMJPEG_VID);
+            avio_wb32(pb, 12);
+            avio_wb32(pb, 0);
+            avio_wb16(pb, codec->width);
+            avio_wb16(pb, codec->height);
+            avio_wl32(pb, tag);
+            avpriv_set_pts_info(st, 32, 1, 1000);
+        }
+    }
+
+    avio_wl32(pb, SMJPEG_HEND);
+    avio_flush(pb);
+
+    return 0;
+}
+
+static int smjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    SMJPEGMuxContext *smc = s->priv_data;
+    AVIOContext *pb = s->pb;
+    AVStream *st = s->streams[pkt->stream_index];
+    AVCodecContext *codec = st->codec;
+
+    if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
+        avio_wl32(pb, SMJPEG_SNDD);
+    else if (codec->codec_type == AVMEDIA_TYPE_VIDEO)
+        avio_wl32(pb, SMJPEG_VIDD);
+    else
+        return 0;
+
+    avio_wb32(pb, pkt->pts);
+    avio_wb32(pb, pkt->size);
+    avio_write(pb, pkt->data, pkt->size);
+    avio_flush(pb);
+
+    smc->duration = FFMAX(smc->duration, pkt->pts + pkt->duration);
+    return 0;
+}
+
+static int smjpeg_write_trailer(AVFormatContext *s)
+{
+    SMJPEGMuxContext *smc = s->priv_data;
+    AVIOContext *pb = s->pb;
+    int64_t currentpos;
+
+    if (pb->seekable) {
+        currentpos = avio_tell(pb);
+        avio_seek(pb, 12, SEEK_SET);
+        avio_wb32(pb, smc->duration);
+        avio_seek(pb, currentpos, SEEK_SET);
+    }
+
+    avio_wl32(pb, SMJPEG_DONE);
+    avio_flush(pb);
+
+    return 0;
+}
+
+AVOutputFormat ff_smjpeg_muxer = {
+    .name           = "smjpeg",
+    .long_name      = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
+    .priv_data_size = sizeof(SMJPEGMuxContext),
+    .audio_codec    = CODEC_ID_PCM_S16LE,
+    .video_codec    = CODEC_ID_MJPEG,
+    .write_header   = smjpeg_write_header,
+    .write_packet   = smjpeg_write_packet,
+    .write_trailer  = smjpeg_write_trailer,
+    .flags          = AVFMT_GLOBALHEADER,
+    .codec_tag      = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
+};