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matroska-demux: Play ProRes video streams

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Generate video/x-prores caps for ProRes video streams.
Every frame needs an 8 byte header prepended, as described in
http://wiki.multimedia.cx/index.php?title=Apple_ProRes#Frame_layout
so do that in a post-processing callback.

https://bugzilla.gnome.org/show_bug.cgi?id=758258
This commit is contained in:
Jan Schmidt 2015-11-18 16:20:38 +11:00
parent 58fcc0a0ab
commit 71d43327a3
2 changed files with 70 additions and 0 deletions
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69
gst/matroska/matroska-demux.c
View file

@ -2971,6 +2971,33 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
return GST_FLOW_OK;
}
static GstFlowReturn
gst_matroska_demux_add_prores_header (GstElement * element,
GstMatroskaTrackContext * stream, GstBuffer ** buf)
{
GstBuffer *newbuf = gst_buffer_new_allocate (NULL, 8, NULL);
GstMapInfo map;
guint32 frame_size;
if (!gst_buffer_map (newbuf, &map, GST_MAP_WRITE)) {
GST_ERROR ("Failed to map newly allocated buffer");
return GST_FLOW_ERROR;
}
frame_size = gst_buffer_get_size (*buf);
GST_WRITE_UINT32_BE (map.data, frame_size);
map.data[4] = 'i';
map.data[5] = 'c';
map.data[6] = 'p';
map.data[7] = 'f';
gst_buffer_unmap (newbuf, &map);
*buf = gst_buffer_append (newbuf, *buf);
return GST_FLOW_OK;
}
/* @text must be null-terminated */
static gboolean
gst_matroska_demux_subtitle_chunk_has_tag (GstElement * element,
@ -5228,6 +5255,48 @@ gst_matroska_demux_video_caps (GstMatroskaTrackVideoContext *
} else if (!strcmp (codec_id, GST_MATROSKA_CODEC_ID_VIDEO_VP9)) {
caps = gst_caps_new_empty_simple ("video/x-vp9");
*codec_name = g_strdup_printf ("On2 VP9");
} else if (!strcmp (codec_id, GST_MATROSKA_CODEC_ID_VIDEO_PRORES)) {
guint32 fourcc;
const gchar *variant, *variant_descr = "";
/* Expect a fourcc in the codec private data */
if (size < 4) {
GST_WARNING ("Too small PRORESS fourcc (%d bytes)", size);
return NULL;
}
fourcc = GST_STR_FOURCC (data);
switch (fourcc) {
case GST_MAKE_FOURCC ('a', 'p', 'c', 's'):
variant_descr = " 4:2:2 LT";
variant = "lt";
break;
case GST_MAKE_FOURCC ('a', 'p', 'c', 'h'):
variant = "hq";
variant_descr = " 4:2:2 HQ";
break;
case GST_MAKE_FOURCC ('a', 'p', '4', 'h'):
variant = "4444";
variant_descr = " 4:4:4:4";
break;
case GST_MAKE_FOURCC ('a', 'p', 'c', 'o'):
variant = "proxy";
variant_descr = " 4:2:2 Proxy";
break;
case GST_MAKE_FOURCC ('a', 'p', 'c', 'n'):
default:
variant = "standard";
variant_descr = " 4:2:2 SD";
break;
}
GST_LOG ("Prores video, codec fourcc %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fourcc));
caps = gst_caps_new_simple ("video/x-prores",
"format", G_TYPE_STRING, variant, NULL);
*codec_name = g_strdup_printf ("Apple ProRes%s", variant_descr);
context->postprocess_frame = gst_matroska_demux_add_prores_header;
} else {
GST_WARNING ("Unknown codec '%s', cannot build Caps", codec_id);
return NULL;

1
gst/matroska/matroska-ids.h
View file

@ -351,6 +351,7 @@
#define GST_MATROSKA_CODEC_ID_VIDEO_VP8 "V_VP8"
#define GST_MATROSKA_CODEC_ID_VIDEO_VP9 "V_VP9"
#define GST_MATROSKA_CODEC_ID_VIDEO_MPEGH_HEVC "V_MPEGH/ISO/HEVC"
#define GST_MATROSKA_CODEC_ID_VIDEO_PRORES "V_PRORES"
#define GST_MATROSKA_CODEC_ID_AUDIO_MPEG1_L1 "A_MPEG/L1"
#define GST_MATROSKA_CODEC_ID_AUDIO_MPEG1_L2 "A_MPEG/L2"