Merge commit 'e02de9df4b218bd6e1e927b67fd4075741545688'

* commit 'e02de9df4b218bd6e1e927b67fd4075741545688':
  lavc: export Dirac parsing API used by the ogg demuxer as public

Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

7 files changed, 226 insertions, 120 deletions

diff --git a/configure b/configure
index ed219e4d5c..7662f37133 100755
--- a/configure
+++ b/configure
@@ -1982,6 +1982,7 @@ CONFIG_EXTRA="
     blockdsp
     bswapdsp
     cabac
+    dirac_parse
     dvprofile
     exif
     faandct
@@ -2216,6 +2217,7 @@ threads_if_any="$THREADS_LIST"
 
 # subsystems
 dct_select="rdft"
+dirac_parse_select="golomb"
 error_resilience_select="me_cmp"
 faandct_deps="faan fdctdsp"
 faanidct_deps="faan idctdsp"
@@ -2272,7 +2274,7 @@ cscd_decoder_select="lzo"
 cscd_decoder_suggest="zlib"
 dca_decoder_select="fmtconvert mdct"
 dds_decoder_select="texturedsp"
-dirac_decoder_select="dwt golomb videodsp mpegvideoenc"
+dirac_decoder_select="dirac_parse dwt golomb videodsp mpegvideoenc"
 dnxhd_decoder_select="blockdsp idctdsp"
 dnxhd_encoder_select="aandcttables blockdsp fdctdsp idctdsp mpegvideoenc pixblockdsp"
 dvvideo_decoder_select="dvprofile idctdsp"
@@ -2706,7 +2708,7 @@ mxf_opatom_muxer_select="mxf_muxer"
 nut_muxer_select="riffenc"
 nuv_demuxer_select="riffdec"
 oga_muxer_select="ogg_muxer"
-ogg_demuxer_select="golomb"
+ogg_demuxer_select="dirac_parse"
 opus_muxer_select="ogg_muxer"
 psp_muxer_select="mov_muxer"
 rtp_demuxer_select="sdp_demuxer"
diff --git a/doc/APIchanges b/doc/APIchanges
index 02cb643f64..fb15411e6c 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -14,10 +14,12 @@ libavutil:     2015-08-28
 
 
 API changes, most recent first:
-2015-12-17 - lavc 57.18.100 / 57.11.0 - avcodec.h
+2015-12-17 - lavc 57.18.100 / 57.11.0 - avcodec.h dirac.h
   xxxxxxx - Add av_packet_add_side_data().
   xxxxxxx - Add AVCodecContext.coded_side_data.
   xxxxxxx - Add AVCPBProperties API.
+  xxxxxxx - Add a new public header dirac.h containing
+            av_dirac_parse_sequence_header()
 
 2015-12-11 - xxxxxxx - lavf 57.20.100 - avformat.h
   Add av_program_add_stream_index()
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index c169135020..44b199e248 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -7,6 +7,7 @@ HEADERS = avcodec.h                                                     \
           avfft.h                                                       \
           dv_profile.h                                                  \
           d3d11va.h                                                     \
+          dirac.h                                                       \
           dxva2.h                                                       \
           qsv.h                                                         \
           vaapi.h                                                       \
@@ -26,6 +27,7 @@ OBJS = allcodecs.o                                                      \
        bitstream_filter.o                                               \
        codec_desc.o                                                     \
        d3d11va.o                                                        \
+       dirac.o                                                          \
        dv_profile.o                                                     \
        imgconvert.o                                                     \
        mathtables.o                                                     \
diff --git a/libavcodec/dirac.c b/libavcodec/dirac.c
index 9bf0fd4302..33cc96098c 100644
--- a/libavcodec/dirac.c
+++ b/libavcodec/dirac.c
@@ -34,6 +34,28 @@
 #include "internal.h"
 #include "mpeg12data.h"
 
+#if CONFIG_DIRAC_PARSE
+
+typedef struct dirac_source_params {
+    unsigned width;
+    unsigned height;
+    uint8_t chroma_format;          ///< 0: 444  1: 422  2: 420
+
+    uint8_t interlaced;
+    uint8_t top_field_first;
+
+    uint8_t frame_rate_index;       ///< index into dirac_frame_rate[]
+    uint8_t aspect_ratio_index;     ///< index into dirac_aspect_ratio[]
+
+    uint16_t clean_width;
+    uint16_t clean_height;
+    uint16_t clean_left_offset;
+    uint16_t clean_right_offset;
+
+    uint8_t pixel_range_index;      ///< index into dirac_pixel_range_presets[]
+    uint8_t color_spec_index;       ///< index into dirac_color_spec_presets[]
+} dirac_source_params;
+
 /* defaults for source parameters */
 static const dirac_source_params dirac_source_parameters_defaults[] = {
     {  640,  480, 2, 0, 0,  1, 1,  640,  480, 0, 0, 1, 0 },
@@ -118,8 +140,8 @@ static const enum AVPixelFormat dirac_pix_fmt[][3] = {
 
 /* [DIRAC_STD] 10.3 Parse Source Parameters.
  * source_parameters(base_video_format) */
-static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
-                                   dirac_source_params *source, int *bit_depth)
+static int parse_source_parameters(AVDiracSeqHeader *dsh, GetBitContext *gb,
+                                   void *log_ctx)
 {
     AVRational frame_rate = { 0, 0 };
     unsigned luma_depth = 8, luma_offset = 16;
@@ -129,8 +151,8 @@ static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
     /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
     /* [DIRAC_STD] custom_dimensions_flag */
     if (get_bits1(gb)) {
-        source->width  = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH  */
-        source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
+        dsh->width  = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH  */
+        dsh->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
     }
 
     /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
@@ -138,10 +160,11 @@ static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
     /* [DIRAC_STD] custom_chroma_format_flag */
     if (get_bits1(gb))
         /* [DIRAC_STD] CHROMA_FORMAT_INDEX */
-        source->chroma_format = svq3_get_ue_golomb(gb);
-    if (source->chroma_format > 2U) {
-        av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
-               source->chroma_format);
+        dsh->chroma_format = svq3_get_ue_golomb(gb);
+    if (dsh->chroma_format > 2U) {
+        if (log_ctx)
+            av_log(log_ctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
+                   dsh->chroma_format);
         return AVERROR_INVALIDDATA;
     }
 
@@ -149,18 +172,18 @@ static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
     /* [DIRAC_STD] custom_scan_format_flag */
     if (get_bits1(gb))
         /* [DIRAC_STD] SOURCE_SAMPLING */
-        source->interlaced = svq3_get_ue_golomb(gb);
-    if (source->interlaced > 1U)
+        dsh->interlaced = svq3_get_ue_golomb(gb);
+    if (dsh->interlaced > 1U)
         return AVERROR_INVALIDDATA;
 
     /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
-        source->frame_rate_index = svq3_get_ue_golomb(gb);
+        dsh->frame_rate_index = svq3_get_ue_golomb(gb);
 
-        if (source->frame_rate_index > 10U)
+        if (dsh->frame_rate_index > 10U)
             return AVERROR_INVALIDDATA;
 
-        if (!source->frame_rate_index) {
+        if (!dsh->frame_rate_index) {
             /* [DIRAC_STD] FRAME_RATE_NUMER */
             frame_rate.num = svq3_get_ue_golomb(gb);
             /* [DIRAC_STD] FRAME_RATE_DENOM */
@@ -168,45 +191,45 @@ static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
         }
     }
     /* [DIRAC_STD] preset_frame_rate(video_params, index) */
-    if (source->frame_rate_index > 0) {
-        if (source->frame_rate_index <= 8)
-            frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index];
+    if (dsh->frame_rate_index > 0) {
+        if (dsh->frame_rate_index <= 8)
+            frame_rate = ff_mpeg12_frame_rate_tab[dsh->frame_rate_index];
         else
             /* [DIRAC_STD] Table 10.3 values 9-10 */
-            frame_rate = dirac_frame_rate[source->frame_rate_index - 9];
+            frame_rate = dirac_frame_rate[dsh->frame_rate_index - 9];
     }
-    avctx->framerate = frame_rate;
+    dsh->framerate = frame_rate;
 
     /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
      * pixel_aspect_ratio(video_params) */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
         /* [DIRAC_STD] index */
-        source->aspect_ratio_index = svq3_get_ue_golomb(gb);
+        dsh->aspect_ratio_index = svq3_get_ue_golomb(gb);
 
-        if (source->aspect_ratio_index > 6U)
+        if (dsh->aspect_ratio_index > 6U)
             return AVERROR_INVALIDDATA;
 
-        if (!source->aspect_ratio_index) {
-            avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
-            avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
+        if (!dsh->aspect_ratio_index) {
+            dsh->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
+            dsh->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
         }
     }
     /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
      *  aspect ratio values */
-    if (source->aspect_ratio_index > 0)
-        avctx->sample_aspect_ratio =
-            dirac_preset_aspect_ratios[source->aspect_ratio_index - 1];
+    if (dsh->aspect_ratio_index > 0)
+        dsh->sample_aspect_ratio =
+            dirac_preset_aspect_ratios[dsh->aspect_ratio_index - 1];
 
     /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
         /* [DIRAC_STD] CLEAN_WIDTH */
-        source->clean_width = svq3_get_ue_golomb(gb);
+        dsh->clean_width = svq3_get_ue_golomb(gb);
         /* [DIRAC_STD] CLEAN_HEIGHT */
-        source->clean_height = svq3_get_ue_golomb(gb);
+        dsh->clean_height = svq3_get_ue_golomb(gb);
         /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
-        source->clean_left_offset = svq3_get_ue_golomb(gb);
+        dsh->clean_left_offset = svq3_get_ue_golomb(gb);
         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
-        source->clean_right_offset = svq3_get_ue_golomb(gb);
+        dsh->clean_right_offset = svq3_get_ue_golomb(gb);
     }
 
     /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
@@ -214,127 +237,160 @@ static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
      * AVCOL_RANGE_MPEG/JPEG values */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
         /* [DIRAC_STD] index */
-        source->pixel_range_index = svq3_get_ue_golomb(gb);
+        dsh->pixel_range_index = svq3_get_ue_golomb(gb);
 
-        if (source->pixel_range_index > 4U)
+        if (dsh->pixel_range_index > 4U)
             return AVERROR_INVALIDDATA;
 
         /* This assumes either fullrange or MPEG levels only */
-        if (!source->pixel_range_index) {
+        if (!dsh->pixel_range_index) {
             luma_offset = svq3_get_ue_golomb(gb);
             luma_depth  = av_log2(svq3_get_ue_golomb(gb)) + 1;
             svq3_get_ue_golomb(gb); /* chroma offset    */
             svq3_get_ue_golomb(gb); /* chroma excursion */
-            avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG
-                                             : AVCOL_RANGE_JPEG;
+            dsh->color_range = luma_offset ? AVCOL_RANGE_MPEG
+                                           : AVCOL_RANGE_JPEG;
         }
     }
     /* [DIRAC_STD] Table 10.5
      * Available signal range presets <--> pixel_range_presets */
-    if (source->pixel_range_index > 0) {
-        idx                = source->pixel_range_index - 1;
+    if (dsh->pixel_range_index > 0) {
+        idx                = dsh->pixel_range_index - 1;
         luma_depth         = pixel_range_presets[idx].bitdepth;
-        avctx->color_range = pixel_range_presets[idx].color_range;
+        dsh->color_range   = pixel_range_presets[idx].color_range;
     }
 
-    *bit_depth = luma_depth;
+    dsh->bit_depth = luma_depth;
 
-    avctx->pix_fmt = dirac_pix_fmt[source->chroma_format][source->pixel_range_index-2];
-    avcodec_get_chroma_sub_sample(avctx->pix_fmt, &chroma_x_shift, &chroma_y_shift);
-    if ((source->width % (1<<chroma_x_shift)) || (source->height % (1<<chroma_y_shift))) {
-        av_log(avctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");
+    dsh->pix_fmt = dirac_pix_fmt[dsh->chroma_format][dsh->pixel_range_index-2];
+    avcodec_get_chroma_sub_sample(dsh->pix_fmt, &chroma_x_shift, &chroma_y_shift);
+    if ((dsh->width % (1<<chroma_x_shift)) || (dsh->height % (1<<chroma_y_shift))) {
+        if (log_ctx)
+            av_log(log_ctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");
         return AVERROR_INVALIDDATA;
     }
 
-
     /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
     if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
         /* [DIRAC_STD] index */
-        idx = source->color_spec_index = svq3_get_ue_golomb(gb);
+        idx = dsh->color_spec_index = svq3_get_ue_golomb(gb);
 
-        if (source->color_spec_index > 4U)
+        if (dsh->color_spec_index > 4U)
             return AVERROR_INVALIDDATA;
 
-        avctx->color_primaries = dirac_color_presets[idx].color_primaries;
-        avctx->colorspace      = dirac_color_presets[idx].colorspace;
-        avctx->color_trc       = dirac_color_presets[idx].color_trc;
+        dsh->color_primaries = dirac_color_presets[idx].color_primaries;
+        dsh->colorspace      = dirac_color_presets[idx].colorspace;
+        dsh->color_trc       = dirac_color_presets[idx].color_trc;
 
-        if (!source->color_spec_index) {
+        if (!dsh->color_spec_index) {
             /* [DIRAC_STD] 10.3.9.1 Colour primaries */
             if (get_bits1(gb)) {
                 idx = svq3_get_ue_golomb(gb);
                 if (idx < 3U)
-                    avctx->color_primaries = dirac_primaries[idx];
+                    dsh->color_primaries = dirac_primaries[idx];
             }
             /* [DIRAC_STD] 10.3.9.2 Colour matrix */
             if (get_bits1(gb)) {
                 idx = svq3_get_ue_golomb(gb);
                 if (!idx)
-                    avctx->colorspace = AVCOL_SPC_BT709;
+                    dsh->colorspace = AVCOL_SPC_BT709;
                 else if (idx == 1)
-                    avctx->colorspace = AVCOL_SPC_BT470BG;
+                    dsh->colorspace = AVCOL_SPC_BT470BG;
             }
             /* [DIRAC_STD] 10.3.9.3 Transfer function */
             if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
-                avctx->color_trc = AVCOL_TRC_BT709;
+                dsh->color_trc = AVCOL_TRC_BT709;
         }
     } else {
-        idx                    = source->color_spec_index;
-        avctx->color_primaries = dirac_color_presets[idx].color_primaries;
-        avctx->colorspace      = dirac_color_presets[idx].colorspace;
-        avctx->color_trc       = dirac_color_presets[idx].color_trc;
+        idx                    = dsh->color_spec_index;
+        dsh->color_primaries = dirac_color_presets[idx].color_primaries;
+        dsh->colorspace      = dirac_color_presets[idx].colorspace;
+        dsh->color_trc       = dirac_color_presets[idx].color_trc;
     }
 
     return 0;
 }
 
 /* [DIRAC_STD] 10. Sequence Header. sequence_header() */
-int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
-                                       dirac_source_params *source,
-                                       DiracVersionInfo *version,
-                                       int *bit_depth)
+int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
+                                   const uint8_t *buf, size_t buf_size,
+                                   void *log_ctx)
 {
+    AVDiracSeqHeader *dsh;
+    GetBitContext gb;
     unsigned video_format, picture_coding_mode;
     int ret;
 
+    dsh = av_mallocz(sizeof(*dsh));
+    if (!dsh)
+        return AVERROR(ENOMEM);
+
+    ret = init_get_bits8(&gb, buf, buf_size);
+    if (ret < 0)
+        goto fail;
+
     /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
-    version->major  = svq3_get_ue_golomb(gb);
-    version->minor  = svq3_get_ue_golomb(gb);
-    avctx->profile  = svq3_get_ue_golomb(gb);
-    avctx->level    = svq3_get_ue_golomb(gb);
+    dsh->version.major = svq3_get_ue_golomb(&gb);
+    dsh->version.minor = svq3_get_ue_golomb(&gb);
+    dsh->profile   = svq3_get_ue_golomb(&gb);
+    dsh->level     = svq3_get_ue_golomb(&gb);
     /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
      * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */
-    video_format    = svq3_get_ue_golomb(gb);
+    video_format   = svq3_get_ue_golomb(&gb);
 
-    if (version->major < 2)
-        av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
-    else if (version->major > 2)
-        av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
+    if (dsh->version.major < 2 && log_ctx)
+        av_log(log_ctx, AV_LOG_WARNING, "Stream is old and may not work\n");
+    else if (dsh->version.major > 2 && log_ctx)
+        av_log(log_ctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
 
     if (video_format > 20U)
         return AVERROR_INVALIDDATA;
 
     /* Fill in defaults for the source parameters. */
-    *source = dirac_source_parameters_defaults[video_format];
+    dsh->width              = dirac_source_parameters_defaults[video_format].width;
+    dsh->height             = dirac_source_parameters_defaults[video_format].height;
+    dsh->chroma_format      = dirac_source_parameters_defaults[video_format].chroma_format;
+    dsh->interlaced         = dirac_source_parameters_defaults[video_format].interlaced;
+    dsh->top_field_first    = dirac_source_parameters_defaults[video_format].top_field_first;
+    dsh->frame_rate_index   = dirac_source_parameters_defaults[video_format].frame_rate_index;
+    dsh->aspect_ratio_index = dirac_source_parameters_defaults[video_format].aspect_ratio_index;
+    dsh->clean_width        = dirac_source_parameters_defaults[video_format].clean_width;
+    dsh->clean_height       = dirac_source_parameters_defaults[video_format].clean_height;
+    dsh->clean_left_offset  = dirac_source_parameters_defaults[video_format].clean_left_offset;
+    dsh->clean_right_offset = dirac_source_parameters_defaults[video_format].clean_right_offset;
+    dsh->pixel_range_index  = dirac_source_parameters_defaults[video_format].pixel_range_index;
+    dsh->color_spec_index   = dirac_source_parameters_defaults[video_format].color_spec_index;
 
     /* [DIRAC_STD] 10.3 Source Parameters
      * Override the defaults. */
-    if (ret = parse_source_parameters(avctx, gb, source, bit_depth))
-        return ret;
-
-    ret = ff_set_dimensions(avctx, source->width, source->height);
+    ret = parse_source_parameters(dsh, &gb, log_ctx);
     if (ret < 0)
-        return ret;
-
-    ff_set_sar(avctx, avctx->sample_aspect_ratio);
+        goto fail;
 
     /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
      * currently only used to signal field coding */
-    picture_coding_mode = svq3_get_ue_golomb(gb);
+    picture_coding_mode = svq3_get_ue_golomb(&gb);
     if (picture_coding_mode != 0) {
-        av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d\n",
-               picture_coding_mode);
-        return AVERROR_INVALIDDATA;
+        if (log_ctx) {
+            av_log(log_ctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
+                   picture_coding_mode);
+        }
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
     }
+
+    *pdsh = dsh;
     return 0;
+fail:
+    av_freep(&dsh);
+    *pdsh = NULL;
+    return ret;
+}
+#else
+int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
+                                   const uint8_t *buf, size_t buf_size,
+                                   void *log_ctx)
+{
+    return AVERROR(ENOSYS);
 }
+#endif
diff --git a/libavcodec/dirac.h b/libavcodec/dirac.h
index b4982f89ce..8d7953d9b4 100644
--- a/libavcodec/dirac.h
+++ b/libavcodec/dirac.h
@@ -32,7 +32,6 @@
  */
 
 #include "avcodec.h"
-#include "get_bits.h"
 
 /**
  * Parse code values:
@@ -61,7 +60,7 @@ typedef struct DiracVersionInfo {
     int minor;
 } DiracVersionInfo;
 
-typedef struct dirac_source_params {
+typedef struct AVDiracSeqHeader {
     unsigned width;
     unsigned height;
     uint8_t chroma_format;          ///< 0: 444  1: 422  2: 420
@@ -79,11 +78,36 @@ typedef struct dirac_source_params {
 
     uint8_t pixel_range_index;      ///< index into dirac_pixel_range_presets[]
     uint8_t color_spec_index;       ///< index into dirac_color_spec_presets[]
-} dirac_source_params;
 
-int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
-                                       dirac_source_params *source,
-                                       DiracVersionInfo *version,
-                                       int *bit_depth);
+    int profile;
+    int level;
+
+    AVRational framerate;
+    AVRational sample_aspect_ratio;
+
+    enum AVPixelFormat pix_fmt;
+    enum AVColorRange color_range;
+    enum AVColorPrimaries color_primaries;
+    enum AVColorTransferCharacteristic color_trc;
+    enum AVColorSpace colorspace;
+
+    DiracVersionInfo version;
+    int bit_depth;
+} AVDiracSeqHeader;
+
+/**
+ * Parse a Dirac sequence header.
+ *
+ * @param dsh this function will allocate and fill an AVDiracSeqHeader struct
+ *            and write it into this pointer. The caller must free it with
+ *            av_free().
+ * @param buf the data buffer
+ * @param buf_size the size of the data buffer in bytes
+ * @param log_ctx if non-NULL, this function will log errors here
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int av_dirac_parse_sequence_header(AVDiracSeqHeader **dsh,
+                                   const uint8_t *buf, size_t buf_size,
+                                   void *log_ctx);
 
 #endif /* AVCODEC_DIRAC_H */
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index 07eb512ad9..000abf7d5a 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -142,7 +142,7 @@ typedef struct DiracContext {
     DiracDSPContext diracdsp;
     DiracVersionInfo version;
     GetBitContext gb;
-    dirac_source_params source;
+    AVDiracSeqHeader seq;
     int seen_sequence_header;
     int frame_number;           /* number of the next frame to display       */
     Plane plane[3];
@@ -339,16 +339,16 @@ static int add_frame(DiracFrame *framelist[], int maxframes, DiracFrame *frame)
 
 static int alloc_sequence_buffers(DiracContext *s)
 {
-    int sbwidth  = DIVRNDUP(s->source.width,  4);
-    int sbheight = DIVRNDUP(s->source.height, 4);
+    int sbwidth  = DIVRNDUP(s->seq.width,  4);
+    int sbheight = DIVRNDUP(s->seq.height, 4);
     int i, w, h, top_padding;
 
     /* todo: think more about this / use or set Plane here */
     for (i = 0; i < 3; i++) {
         int max_xblen = MAX_BLOCKSIZE >> (i ? s->chroma_x_shift : 0);
         int max_yblen = MAX_BLOCKSIZE >> (i ? s->chroma_y_shift : 0);
-        w = s->source.width  >> (i ? s->chroma_x_shift : 0);
-        h = s->source.height >> (i ? s->chroma_y_shift : 0);
+        w = s->seq.width  >> (i ? s->chroma_x_shift : 0);
+        h = s->seq.height >> (i ? s->chroma_y_shift : 0);
 
         /* we allocate the max we support here since num decompositions can
          * change from frame to frame. Stride is aligned to 16 for SIMD, and
@@ -377,8 +377,8 @@ static int alloc_sequence_buffers(DiracContext *s)
 
 static int alloc_buffers(DiracContext *s, int stride)
 {
-    int w = s->source.width;
-    int h = s->source.height;
+    int w = s->seq.width;
+    int h = s->seq.height;
 
     av_assert0(stride >= w);
     stride += 64;
@@ -937,8 +937,8 @@ static void init_planes(DiracContext *s)
     for (i = 0; i < 3; i++) {
         Plane *p = &s->plane[i];
 
-        p->width       = s->source.width  >> (i ? s->chroma_x_shift : 0);
-        p->height      = s->source.height >> (i ? s->chroma_y_shift : 0);
+        p->width       = s->seq.width  >> (i ? s->chroma_x_shift : 0);
+        p->height      = s->seq.height >> (i ? s->chroma_y_shift : 0);
         p->idwt_width  = w = CALC_PADDING(p->width , s->wavelet_depth);
         p->idwt_height = h = CALC_PADDING(p->height, s->wavelet_depth);
         p->idwt_stride = FFALIGN(p->idwt_width << (1 + s->pshift), 8);
@@ -1370,8 +1370,8 @@ static int dirac_unpack_block_motion_data(DiracContext *s)
     align_get_bits(gb);
 
     /* [DIRAC_STD] 11.2.4 and 12.2.1 Number of blocks and superblocks */
-    s->sbwidth  = DIVRNDUP(s->source.width,  4*s->plane[0].xbsep);
-    s->sbheight = DIVRNDUP(s->source.height, 4*s->plane[0].ybsep);
+    s->sbwidth  = DIVRNDUP(s->seq.width,  4*s->plane[0].xbsep);
+    s->sbheight = DIVRNDUP(s->seq.height, 4*s->plane[0].ybsep);
     s->blwidth  = 4 * s->sbwidth;
     s->blheight = 4 * s->sbheight;
 
@@ -1966,6 +1966,7 @@ static int dirac_decode_data_unit(AVCodecContext *avctx, const uint8_t *buf, int
 {
     DiracContext *s   = avctx->priv_data;
     DiracFrame *pic   = NULL;
+    AVDiracSeqHeader *dsh;
     int ret, i;
     uint8_t parse_code;
     unsigned tmp;
@@ -1982,10 +1983,24 @@ static int dirac_decode_data_unit(AVCodecContext *avctx, const uint8_t *buf, int
             return 0;
 
         /* [DIRAC_STD] 10. Sequence header */
-        ret = avpriv_dirac_parse_sequence_header(avctx, &s->gb, &s->source,
-                                                 &s->version, &s->bit_depth);
-        if (ret < 0)
+        ret = av_dirac_parse_sequence_header(&dsh, buf + DATA_UNIT_HEADER_SIZE, size - DATA_UNIT_HEADER_SIZE, avctx);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "error parsing sequence header");
             return ret;
+        }
+
+        ff_set_dimensions(avctx, dsh->width, dsh->height);
+        avctx->pix_fmt         = dsh->pix_fmt;
+        avctx->color_range     = dsh->color_range;
+        avctx->color_trc       = dsh->color_trc;
+        avctx->color_primaries = dsh->color_primaries;
+        avctx->colorspace      = dsh->colorspace;
+        avctx->profile         = dsh->profile;
+        avctx->level           = dsh->level;
+        avctx->framerate       = dsh->framerate;
+        s->bit_depth           = dsh->bit_depth;
+        s->seq                 = *dsh;
+        av_freep(&dsh);
 
         s->pshift = s->bit_depth > 8;
 
diff --git a/libavformat/oggparsedirac.c b/libavformat/oggparsedirac.c
index ff947a04e1..a39ea4a319 100644
--- a/libavformat/oggparsedirac.c
+++ b/libavformat/oggparsedirac.c
@@ -18,7 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "libavcodec/get_bits.h"
+#include "libavutil/intreadwrite.h"
 #include "libavcodec/dirac.h"
 #include "avformat.h"
 #include "internal.h"
@@ -29,28 +29,33 @@ static int dirac_header(AVFormatContext *s, int idx)
     struct ogg *ogg = s->priv_data;
     struct ogg_stream *os = ogg->streams + idx;
     AVStream *st = s->streams[idx];
-    dirac_source_params source;
-    DiracVersionInfo version;
-    GetBitContext gb;
-    int ret, bit_depth;
+    AVDiracSeqHeader *dsh;
+    int ret;
 
     // already parsed the header
     if (st->codec->codec_id == AV_CODEC_ID_DIRAC)
         return 0;
 
-    ret = init_get_bits8(&gb, os->buf + os->pstart + 13, (os->psize - 13));
+    ret = av_dirac_parse_sequence_header(&dsh, os->buf + os->pstart + 13, (os->psize - 13), s);
     if (ret < 0)
         return ret;
 
-    ret = avpriv_dirac_parse_sequence_header(st->codec, &gb, &source, &version,
-                                             &bit_depth);
-    if (ret < 0)
-        return ret;
+    st->codec->codec_type      = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id        = AV_CODEC_ID_DIRAC;
+    st->codec->width           = dsh->width;
+    st->codec->height          = dsh->height;
+    st->codec->pix_fmt         = dsh->pix_fmt;
+    st->codec->color_range     = dsh->color_range;
+    st->codec->color_trc       = dsh->color_trc;
+    st->codec->color_primaries = dsh->color_primaries;
+    st->codec->colorspace      = dsh->colorspace;
+    st->codec->profile         = dsh->profile;
+    st->codec->level           = dsh->level;
 
-    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
-    st->codec->codec_id = AV_CODEC_ID_DIRAC;
     // dirac in ogg always stores timestamps as though the video were interlaced
-    avpriv_set_pts_info(st, 64, st->codec->framerate.den, 2*st->codec->framerate.num);
+    avpriv_set_pts_info(st, 64, dsh->framerate.den, 2 * dsh->framerate.num);
+
+    av_freep(&dsh);
     return 1;
 }