[Libav-user] imgutils.h decode dst buffer going from avpicture_fill to av_image_fill_arrays
linux2 at orion15.org
Wed Aug 17 21:16:08 EEST 2016
I am trying to get single frame decoding of h.264 video in an openGL
Having an issue seeing how to get from avpicture_fill to
avpicture_fill( (AVPicture *) m_avframeRGB, buffer, AV_PIX_FMT_RGB24,
m_avcodec_ctx->width, m_avcodec_ctx->height )
int av_image_fill_arrays(uint8_t *dst_data, int dst_linesize,
const uint8_t *src,
enum AVPixelFormat pix_fmt, int width, int
height, int align )
The code follows examples at:
Unable to find examples using av_image_fill_arrays.
What I would like to to do is pass in the pointer to a texture array and
have the sws_scale load the RGB data into that location.
Sample code I am finding appears to do multiple copies of the buffers.
Comments like this one:
//Manadatory function to copy the image form an AVFrame to a generic buffer.
av_image_copy_to_buffer( (uint8_t*) m_avframeRGB, m_size, (const uint8_t
* const*)rgb_buffer, &m_height, AV_PIX_FMT_RGB24, m_width, m_height,
... width height codec
m_sws_ctx = sws_getContext( m_width, m_height, AV_PIX_FMT_YUV420P,
m_width, m_height, AV_PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL );
/// I think these two calls are just setting up a common struct format
but not actually allocating buffers to hold the pixel data
m_avframe = get_alloc_picture( AV_PIX_FMT_YUV420P, m_width,
m_height, true );
m_avframeRGB = get_alloc_picture( AV_PIX_FMT_RGB24, m_width,
m_height, true );
getFrame( char * rgb_buffer, size_t size )
av_return = avcodec_send_packet( m_avcodec_context, &av_packet )
while ( ! frame_done ) gobble packets
/// use the input buffer as the output of the YUV to RGB24
sws_scale( m_sws_ctx, m_avframe->data, m_avframe->linesize, 0, m_height,
rgb_buffer, m_avframeRGB->linesize );
Am I even on the right highway here?
An even better way may to be get the YUV pointer and run a fragment
shader across it, is there a way to leave the buffer in the video ram?
Any pointers would be appreciated.
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