Etheora

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(initial info about etheora.)
m (minor visual changes.)
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An encoding process is made by these steps:
An encoding process is made by these steps:
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<nowiki>
 
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/*a context declaration.*/
 
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etheora_ctx *ec;
 
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/*encoder configuration.*/
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/* a context declaration. */
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etheora_enc_configure(&ec, width, height, ETHEORA_ASPECT_NORMAL,
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etheora_ctx *ec;
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fopen("output-video.ogg"), fopen("debug_info.txt"));
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/*encoder start.*/
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/* encoder configuration. */
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etheora_enc_start(&ec);
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etheora_enc_configure(&ec, width, height, ETHEORA_ASPECT_NORMAL,
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fopen("output-video.ogg"), fopen("debug_info.txt"));
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/*drawing next frame, by puting a r,g,b or y,u,v pixel in (i,j) coordinate*/
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/* encoder start. */
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etheora_enc_rgb_draw(&ec, i, j, r, g, b) (alternative: etheora_enc_yuv_draw()),
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etheora_enc_start(&ec);
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/*submiting frame to encoding.*/
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/* drawing next frame, by puting a r,g,b or y,u,v pixel in (i,j) coordinate */
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etheora_enc_nextframe(&ec);
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etheora_enc_rgb_draw(&ec, i, j, r, g, b);
 +
/* alternative: etheora_enc_yuv_draw()) */
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/*submiting last frame to encoding by finishing the process.*/
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/* submiting frame to encoding. */
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etheora_enc_finish(&ec);
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etheora_enc_nextframe(&ec);
 +
 
 +
/* submiting last frame to encoding by finishing the process. */
 +
etheora_enc_finish(&ec);
The decoding process is quite similar.
The decoding process is quite similar.
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/*a context declaration.*/
 
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etheora_ctx *ec;
 
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/*decoder configuration.*/
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/* a context declaration. */
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etheora_dec_configure(&ec, fopen("input-video.ogg"), fopen("debug_info.txt"));
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etheora_ctx *ec;
 +
 
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/* decoder configuration. */
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etheora_dec_configure(&ec, fopen("input-video.ogg"), fopen("debug_info.txt"));  
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/*decoder start.*/
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/* decoder start. */
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etheora_dec_start(&ec);
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etheora_dec_start(&ec);  
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/*reading video data.*/
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/* reading video data. */
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etheora_get_width(&ec);
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etheora_get_width(&ec);
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etheora_get_heigth(&ec);
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etheora_get_heigth(&ec);
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etheora_get_fps_numerator(&ec);
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etheora_get_fps_numerator(&ec);
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etheora_get_fps_denominator(&ec);
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etheora_get_fps_denominator(&ec);
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etheora_get_aspect_numerator(&ec);
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etheora_get_aspect_numerator(&ec);
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etheora_get_aspect_denominator(&ec);
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etheora_get_aspect_denominator(&ec);
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/*getting next frame by decoding it.*/
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/* getting next frame by decoding it. */
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etheora_dec_nextframe(&ec);
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etheora_dec_nextframe(&ec);  
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/*getting frame data, by reading a r,g,b or y,u,v pixel in (i,j) coordinate*/
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/* getting frame data, by reading a r,g,b or y,u,v pixel in (i,j) coordinate*/
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etheora_dec_rgb_read(&ec, i, j, &r, &g, &b) (alternative:
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etheora_dec_rgb_read(&ec, i, j, &r, &g, &b)
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etheora_dec_yuv_read()),
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/* alternative: etheora_dec_yuv_read()) */
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/* finishing the process.*/
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/* finishing the process. */
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etheora_dec_finish(&ec);
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etheora_dec_finish(&ec);
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the functions _yuv_ and _rgb_ works transparently with OC_PF_420,
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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.
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OC_PF_422 and OC_PF_PF_444, having the libtheora version used support
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for them or not.
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</nowiki>
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Etheora is documented here:
Etheora is documented here:

Revision as of 16:54, 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.

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 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.

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 examples are 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).

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