lavf: data muxer and demuxer.

Allow to use tools designed to work with demuxers, muxers
and packets (for example ffmpeg itself) to process raw byte
streams (like aviocat).

libavformat/Makefile

@@ -103,6 +103,8 @@ OBJS-$(CONFIG_CDG_DEMUXER)               += cdg.o
 OBJS-$(CONFIG_CDXL_DEMUXER)              += cdxl.o
 OBJS-$(CONFIG_CONCAT_DEMUXER)            += concatdec.o
 OBJS-$(CONFIG_CRC_MUXER)                 += crcenc.o
+OBJS-$(CONFIG_DATA_DEMUXER)              += rawdec.o
+OBJS-$(CONFIG_DATA_MUXER)                += rawdec.o
 OBJS-$(CONFIG_DAUD_DEMUXER)              += daud.o
 OBJS-$(CONFIG_DAUD_MUXER)                += daud.o
 OBJS-$(CONFIG_DFA_DEMUXER)               += dfa.o

libavformat/allformats.c

@@ -100,6 +100,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (CDXL,             cdxl);
     REGISTER_DEMUXER (CONCAT,           concat);
     REGISTER_MUXER   (CRC,              crc);
+    REGISTER_MUXDEMUX(DATA,             data);
     REGISTER_MUXDEMUX(DAUD,             daud);
     REGISTER_DEMUXER (DFA,              dfa);
     REGISTER_MUXDEMUX(DIRAC,            dirac);

libavformat/rawdec.c

@@ -90,6 +90,17 @@ fail:
     return ret;
 }
 
+static int ff_raw_data_read_header(AVFormatContext *s)
+{
+    AVStream *st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->codec->codec_type = AVMEDIA_TYPE_DATA;
+    st->codec->codec_id = s->iformat->raw_codec_id;
+    st->start_time = 0;
+    return 0;
+}
+
 /* Note: Do not forget to add new entries to the Makefile as well. */
 
 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
@@ -99,6 +110,16 @@ const AVOption ff_rawvideo_options[] = {
     { NULL },
 };
 
+#if CONFIG_DATA_DEMUXER
+AVInputFormat ff_data_demuxer = {
+    .name           = "data",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw data"),
+    .read_header    = ff_raw_data_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .raw_codec_id   = AV_CODEC_ID_NONE,
+};
+#endif
+
 #if CONFIG_LATM_DEMUXER
 AVInputFormat ff_latm_demuxer = {
     .name           = "latm",

libavformat/rawenc.c

@@ -68,6 +68,15 @@ AVOutputFormat ff_cavsvideo_muxer = {
 };
 #endif
 
+#if CONFIG_DATA_MUXER
+AVOutputFormat ff_data_muxer = {
+    .name              = "data",
+    .long_name         = NULL_IF_CONFIG_SMALL("raw data"),
+    .write_packet      = ff_raw_write_packet,
+    .flags             = AVFMT_NOTIMESTAMPS,
+};
+#endif
+
 #if CONFIG_DIRAC_MUXER
 AVOutputFormat ff_dirac_muxer = {
     .name              = "dirac",

libavformat/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 55
-#define LIBAVFORMAT_VERSION_MINOR  3
+#define LIBAVFORMAT_VERSION_MINOR  4
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \