lavf: add functions for accessing the fourcc<->CodecID mapping tables.

Fixes bug 212.

4 files changed, 63 insertions, 27 deletions

diff --git a/doc/APIchanges b/doc/APIchanges
index 87de464ebb..0d4cb596a7 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,9 @@ libavutil:   2011-04-18
 
 API changes, most recent first:
 
+2012-01-31 - xxxxxxx - lavf 54.01.0
+  Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().
+
 2012-01-31 - xxxxxxx - lavc 54.01.0
   Add avcodec_is_open() function.
 
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 45f757690d..06718d2485 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -10,6 +10,7 @@ OBJS = allformats.o         \
        metadata.o           \
        options.o            \
        os_support.o         \
+       riff.o               \
        sdp.o                \
        seek.o               \
        utils.o              \
@@ -25,8 +26,8 @@ OBJS-$(CONFIG_ADX_DEMUXER)               += adxdec.o
 OBJS-$(CONFIG_ADX_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_ADTS_MUXER)                += adtsenc.o
 OBJS-$(CONFIG_AEA_DEMUXER)               += aea.o pcm.o
-OBJS-$(CONFIG_AIFF_DEMUXER)              += aiffdec.o riff.o pcm.o
-OBJS-$(CONFIG_AIFF_MUXER)                += aiffenc.o riff.o
+OBJS-$(CONFIG_AIFF_DEMUXER)              += aiffdec.o pcm.o
+OBJS-$(CONFIG_AIFF_MUXER)                += aiffenc.o
 OBJS-$(CONFIG_AMR_DEMUXER)               += amr.o
 OBJS-$(CONFIG_AMR_MUXER)                 += amr.o
 OBJS-$(CONFIG_ANM_DEMUXER)               += anm.o
@@ -34,14 +35,14 @@ OBJS-$(CONFIG_APC_DEMUXER)               += apc.o
 OBJS-$(CONFIG_APE_DEMUXER)               += ape.o apetag.o
 OBJS-$(CONFIG_APPLEHTTP_DEMUXER)         += applehttp.o
 OBJS-$(CONFIG_ASF_DEMUXER)               += asfdec.o asf.o asfcrypt.o \
-                                            riff.o avlanguage.o
-OBJS-$(CONFIG_ASF_MUXER)                 += asfenc.o asf.o riff.o
+                                            avlanguage.o
+OBJS-$(CONFIG_ASF_MUXER)                 += asfenc.o asf.o
 OBJS-$(CONFIG_ASS_DEMUXER)               += assdec.o
 OBJS-$(CONFIG_ASS_MUXER)                 += assenc.o
 OBJS-$(CONFIG_AU_DEMUXER)                += au.o pcm.o
 OBJS-$(CONFIG_AU_MUXER)                  += au.o
-OBJS-$(CONFIG_AVI_DEMUXER)               += avidec.o riff.o
-OBJS-$(CONFIG_AVI_MUXER)                 += avienc.o riff.o
+OBJS-$(CONFIG_AVI_DEMUXER)               += avidec.o
+OBJS-$(CONFIG_AVI_MUXER)                 += avienc.o
 OBJS-$(CONFIG_AVISYNTH)                  += avisynth.o
 OBJS-$(CONFIG_AVM2_MUXER)                += swfenc.o
 OBJS-$(CONFIG_AVS_DEMUXER)               += avs.o vocdec.o voc.o
@@ -51,7 +52,7 @@ OBJS-$(CONFIG_BINK_DEMUXER)              += bink.o
 OBJS-$(CONFIG_BMV_DEMUXER)               += bmv.o
 OBJS-$(CONFIG_C93_DEMUXER)               += c93.o vocdec.o voc.o
 OBJS-$(CONFIG_CAF_DEMUXER)               += cafdec.o caf.o mov.o mov_chan.o \
-                                            riff.o isom.o
+                                            isom.o
 OBJS-$(CONFIG_CAVSVIDEO_DEMUXER)         += cavsvideodec.o rawdec.o
 OBJS-$(CONFIG_CAVSVIDEO_MUXER)           += rawenc.o
 OBJS-$(CONFIG_CDG_DEMUXER)               += cdg.o
@@ -68,7 +69,7 @@ OBJS-$(CONFIG_DTS_DEMUXER)               += dtsdec.o rawdec.o
 OBJS-$(CONFIG_DTS_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_DV_DEMUXER)                += dv.o
 OBJS-$(CONFIG_DV_MUXER)                  += dvenc.o
-OBJS-$(CONFIG_DXA_DEMUXER)               += dxa.o riff.o
+OBJS-$(CONFIG_DXA_DEMUXER)               += dxa.o
 OBJS-$(CONFIG_EA_CDATA_DEMUXER)          += eacdata.o
 OBJS-$(CONFIG_EA_DEMUXER)                += electronicarts.o
 OBJS-$(CONFIG_EAC3_DEMUXER)              += ac3dec.o rawdec.o
@@ -112,7 +113,7 @@ OBJS-$(CONFIG_INGENIENT_DEMUXER)         += ingenientdec.o rawdec.o
 OBJS-$(CONFIG_IPMOVIE_DEMUXER)           += ipmovie.o
 OBJS-$(CONFIG_ISS_DEMUXER)               += iss.o
 OBJS-$(CONFIG_IV8_DEMUXER)               += iv8.o
-OBJS-$(CONFIG_IVF_DEMUXER)               += ivfdec.o riff.o
+OBJS-$(CONFIG_IVF_DEMUXER)               += ivfdec.o
 OBJS-$(CONFIG_IVF_MUXER)                 += ivfenc.o
 OBJS-$(CONFIG_JV_DEMUXER)                += jvdec.o
 OBJS-$(CONFIG_LATM_DEMUXER)              += rawdec.o
@@ -122,9 +123,9 @@ OBJS-$(CONFIG_LXF_DEMUXER)               += lxfdec.o
 OBJS-$(CONFIG_M4V_DEMUXER)               += m4vdec.o rawdec.o
 OBJS-$(CONFIG_M4V_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_MATROSKA_DEMUXER)          += matroskadec.o matroska.o \
-                                            riff.o isom.o rmdec.o rm.o
+                                            isom.o rmdec.o rm.o
 OBJS-$(CONFIG_MATROSKA_MUXER)            += matroskaenc.o matroska.o \
-                                            riff.o isom.o avc.o \
+                                            isom.o avc.o \
                                             flacenc_header.o avlanguage.o
 OBJS-$(CONFIG_MD5_MUXER)                 += md5enc.o
 OBJS-$(CONFIG_MJPEG_DEMUXER)             += rawdec.o
@@ -133,9 +134,9 @@ OBJS-$(CONFIG_MLP_DEMUXER)               += rawdec.o
 OBJS-$(CONFIG_MLP_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_MM_DEMUXER)                += mm.o
 OBJS-$(CONFIG_MMF_DEMUXER)               += mmf.o pcm.o
-OBJS-$(CONFIG_MMF_MUXER)                 += mmf.o riff.o
-OBJS-$(CONFIG_MOV_DEMUXER)               += mov.o riff.o isom.o mov_chan.o
-OBJS-$(CONFIG_MOV_MUXER)                 += movenc.o riff.o isom.o avc.o \
+OBJS-$(CONFIG_MMF_MUXER)                 += mmf.o
+OBJS-$(CONFIG_MOV_DEMUXER)               += mov.o isom.o mov_chan.o
+OBJS-$(CONFIG_MOV_MUXER)                 += movenc.o isom.o avc.o \
                                             movenchint.o rtpenc_chain.o \
                                             mov_chan.o
 OBJS-$(CONFIG_MP2_MUXER)                 += mp3enc.o rawenc.o
@@ -164,9 +165,9 @@ OBJS-$(CONFIG_MXG_DEMUXER)               += mxg.o
 OBJS-$(CONFIG_NC_DEMUXER)                += ncdec.o
 OBJS-$(CONFIG_NSV_DEMUXER)               += nsvdec.o
 OBJS-$(CONFIG_NULL_MUXER)                += nullenc.o
-OBJS-$(CONFIG_NUT_DEMUXER)               += nutdec.o nut.o riff.o
-OBJS-$(CONFIG_NUT_MUXER)                 += nutenc.o nut.o riff.o
-OBJS-$(CONFIG_NUV_DEMUXER)               += nuv.o riff.o
+OBJS-$(CONFIG_NUT_DEMUXER)               += nutdec.o nut.o
+OBJS-$(CONFIG_NUT_MUXER)                 += nutenc.o nut.o
+OBJS-$(CONFIG_NUV_DEMUXER)               += nuv.o
 OBJS-$(CONFIG_OGG_DEMUXER)               += oggdec.o         \
                                             oggparsecelt.o   \
                                             oggparsedirac.o  \
@@ -176,7 +177,6 @@ OBJS-$(CONFIG_OGG_DEMUXER)               += oggdec.o         \
                                             oggparsespeex.o  \
                                             oggparsetheora.o \
                                             oggparsevorbis.o \
-                                            riff.o \
                                             vorbiscomment.o
 OBJS-$(CONFIG_OGG_MUXER)                 += oggenc.o \
                                             vorbiscomment.o
@@ -301,28 +301,28 @@ OBJS-$(CONFIG_VMD_DEMUXER)               += sierravmd.o
 OBJS-$(CONFIG_VOC_DEMUXER)               += vocdec.o voc.o
 OBJS-$(CONFIG_VOC_MUXER)                 += vocenc.o voc.o
 OBJS-$(CONFIG_VQF_DEMUXER)               += vqf.o
-OBJS-$(CONFIG_W64_DEMUXER)               += wav.o riff.o pcm.o
-OBJS-$(CONFIG_WAV_DEMUXER)               += wav.o riff.o pcm.o
-OBJS-$(CONFIG_WAV_MUXER)                 += wav.o riff.o
+OBJS-$(CONFIG_W64_DEMUXER)               += wav.o pcm.o
+OBJS-$(CONFIG_WAV_DEMUXER)               += wav.o pcm.o
+OBJS-$(CONFIG_WAV_MUXER)                 += wav.o
 OBJS-$(CONFIG_WC3_DEMUXER)               += wc3movie.o
 OBJS-$(CONFIG_WEBM_MUXER)                += matroskaenc.o matroska.o \
-                                            riff.o isom.o avc.o \
+                                            isom.o avc.o \
                                             flacenc_header.o avlanguage.o
 OBJS-$(CONFIG_WSAUD_DEMUXER)             += westwood_aud.o
 OBJS-$(CONFIG_WSVQA_DEMUXER)             += westwood_vqa.o
 OBJS-$(CONFIG_WTV_DEMUXER)               += wtv.o asfdec.o asf.o asfcrypt.o \
-                                            avlanguage.o mpegts.o isom.o riff.o
+                                            avlanguage.o mpegts.o isom.o
 OBJS-$(CONFIG_WV_DEMUXER)                += wv.o apetag.o
 OBJS-$(CONFIG_XA_DEMUXER)                += xa.o
-OBJS-$(CONFIG_XMV_DEMUXER)               += xmv.o riff.o
-OBJS-$(CONFIG_XWMA_DEMUXER)              += xwma.o riff.o
+OBJS-$(CONFIG_XMV_DEMUXER)               += xmv.o
+OBJS-$(CONFIG_XWMA_DEMUXER)              += xwma.o
 OBJS-$(CONFIG_YOP_DEMUXER)               += yop.o
 OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpeg.o
 OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpeg.o
 
 # external libraries
-OBJS-$(CONFIG_LIBNUT_DEMUXER)            += libnut.o riff.o
-OBJS-$(CONFIG_LIBNUT_MUXER)              += libnut.o riff.o
+OBJS-$(CONFIG_LIBNUT_DEMUXER)            += libnut.o
+OBJS-$(CONFIG_LIBNUT_MUXER)              += libnut.o
 
 # protocols I/O
 OBJS+= avio.o aviobuf.o
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 217d8139df..7b67889e73 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1601,6 +1601,30 @@ int av_match_ext(const char *filename, const char *extensions);
 int avformat_query_codec(AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance);
 
 /**
+ * @defgroup riff_fourcc RIFF FourCCs
+ * @{
+ * Get the tables mapping RIFF FourCCs to libavcodec CodecIDs. The tables are
+ * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
+ * following code:
+ * @code
+ * uint32_t tag = MKTAG('H', '2', '6', '4');
+ * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
+ * enum CodecID id = av_codec_get_id(table, tag);
+ * @endcode
+ */
+/**
+ * @return the table mapping RIFF FourCCs for video to libavcodec CodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_video_tags(void);
+/**
+ * @return the table mapping RIFF FourCCs for audio to CodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_audio_tags(void);
+/**
+ * @}
+ */
+
+/**
  * @}
  */
 
diff --git a/libavformat/utils.c b/libavformat/utils.c
index cf7180b3cf..e10348df60 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -3874,3 +3874,12 @@ int ff_add_param_change(AVPacket *pkt, int32_t channels,
     }
     return 0;
 }
+
+const struct AVCodecTag *avformat_get_riff_video_tags(void)
+{
+    return ff_codec_bmp_tags;
+}
+const struct AVCodecTag *avformat_get_riff_audio_tags(void)
+{
+    return ff_codec_wav_tags;
+}