Etheora

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'''Etheora''' is a a simplified API to programming theora video encoding/decoding applications with ogg containers. It uses and  encapsulates libtheora + libogg API and structures, so users need to know very few  about video and data containers.
'''Etheora''' is a a simplified API to programming theora video encoding/decoding applications with ogg containers. It uses and  encapsulates libtheora + libogg API and structures, so users need to know very few  about video and data containers.
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 +
 +
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== Overview - Encoding ==
An encoding process is made by these steps:
An encoding process is made by these steps:
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  etheora_enc_finish(&ec);
  etheora_enc_finish(&ec);
 +
The functions _yuv_ and _rgb_ works transparently with OC_PF_420, OC_PF_422 and OC_PF_PF_444, having the libtheora version used support for them or not.
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== Overview - Decoding ==
The decoding process is quite similar.
The decoding process is quite similar.
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  etheora_dec_finish(&ec);
  etheora_dec_finish(&ec);
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the functions _yuv_ and _rgb_ works transparently with OC_PF_420, OC_PF_422 and OC_PF_PF_444, having the libtheora version used support for them or not.
+
The functions _yuv_ and _rgb_ works transparently with OC_PF_420, OC_PF_422 and OC_PF_PF_444, having the libtheora version used support for them or not.
 +
 
 +
== Overview - Going Futher ==
Etheora is documented here:
Etheora is documented here:
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http://svn.xiph.org/branches/etheora-0.1/src/
http://svn.xiph.org/branches/etheora-0.1/src/
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Etheora examples are here:
+
Etheora very simple examples are found here:
http://svn.xiph.org/branches/etheora-0.1/examples/
http://svn.xiph.org/branches/etheora-0.1/examples/
Etheora still doesn't have audio/speech support. (Although it can get video data from videos with audio). And uses internally the old libtheora API (ie, not the theora-exp).
Etheora still doesn't have audio/speech support. (Although it can get video data from videos with audio). And uses internally the old libtheora API (ie, not the theora-exp).
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 +
== TODO ==
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* Vorbis support
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* Speex support
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* Skeleton support
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 +
== See also ==
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{{Template:Theora}}

Revision as of 17:09, 20 November 2007

Etheora is a a simplified API to programming theora video encoding/decoding applications with ogg containers. It uses and encapsulates libtheora + libogg API and structures, so users need to know very few about video and data containers.


Contents

Overview - Encoding

An encoding process is made by these steps:

/* a context declaration. */
etheora_ctx *ec;
/* encoder configuration. */
etheora_enc_configure(&ec, width, height, ETHEORA_ASPECT_NORMAL,
fopen("output-video.ogg"), fopen("debug_info.txt"));
/* encoder start. */
etheora_enc_start(&ec);
/* drawing next frame, by puting a r,g,b or y,u,v pixel in (i,j) coordinate */
etheora_enc_rgb_draw(&ec, i, j, r, g, b);
/* alternative: etheora_enc_yuv_draw()) */
/* submiting frame to encoding. */
etheora_enc_nextframe(&ec);
/* submiting last frame to encoding by finishing the process. */
etheora_enc_finish(&ec);
The functions _yuv_ and _rgb_ works transparently with OC_PF_420, OC_PF_422 and OC_PF_PF_444, having the libtheora version used support for them or not.

Overview - Decoding

The decoding process is quite similar.

/* a context declaration. */
etheora_ctx *ec;
/* decoder configuration. */
etheora_dec_configure(&ec, fopen("input-video.ogg"), fopen("debug_info.txt")); 
/* decoder start. */
etheora_dec_start(&ec); 
/* reading video data. */
etheora_get_width(&ec);
etheora_get_heigth(&ec);
etheora_get_fps_numerator(&ec);
etheora_get_fps_denominator(&ec);
etheora_get_aspect_numerator(&ec);
etheora_get_aspect_denominator(&ec);
/* getting next frame by decoding it. */
etheora_dec_nextframe(&ec); 
/* getting frame data, by reading a r,g,b or y,u,v pixel in (i,j) coordinate*/
etheora_dec_rgb_read(&ec, i, j, &r, &g, &b)
/* alternative: etheora_dec_yuv_read()) */
/* finishing the process. */
etheora_dec_finish(&ec);

The functions _yuv_ and _rgb_ works transparently with OC_PF_420, OC_PF_422 and OC_PF_PF_444, having the libtheora version used support for them or not.

Overview - Going Futher

Etheora is documented here: http://svn.xiph.org/branches/etheora-0.1/doc/etheora_documentation.pdf

Etheora code is here: http://svn.xiph.org/branches/etheora-0.1/src/

Etheora very simple examples are found here: http://svn.xiph.org/branches/etheora-0.1/examples/

Etheora still doesn't have audio/speech support. (Although it can get video data from videos with audio). And uses internally the old libtheora API (ie, not the theora-exp).

TODO

  • Vorbis support
  • Speex support
  • Skeleton support

See also

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