ImxVpuDecReturnCodes imx_vpu_jpeg_dec_decode(ImxVpuJPEGDecoder *jpeg_decoder, uint8_t const *jpeg_data, size_t const jpeg_data_size)
{
unsigned int output_code;
ImxVpuDecReturnCodes ret;
ImxVpuEncodedFrame encoded_frame;
assert(jpeg_data != NULL);
assert(jpeg_data_size > 0);
assert(jpeg_decoder != NULL);
assert(jpeg_decoder->decoder != NULL);
memset(&encoded_frame, 0, sizeof(encoded_frame));
encoded_frame.data = (uint8_t *)jpeg_data;
encoded_frame.data_size = jpeg_data_size;
if ((ret = imx_vpu_dec_decode(jpeg_decoder->decoder, &encoded_frame, &output_code)) != IMX_VPU_DEC_RETURN_CODE_OK)
return ret;
if (output_code & IMX_VPU_DEC_OUTPUT_CODE_DECODED_FRAME_AVAILABLE)
{
if ((ret = imx_vpu_dec_get_decoded_frame(jpeg_decoder->decoder, &(jpeg_decoder->raw_frame))) != IMX_VPU_DEC_RETURN_CODE_OK)
return ret;
}
else
{
jpeg_decoder->raw_frame.framebuffer = NULL;
}
return IMX_VPU_DEC_RETURN_CODE_OK;
}
Retval run(Context *ctx)
{
unsigned int output_code;
{
long size;
void *buf;
fseek(ctx->fin, 0, SEEK_END);
size = ftell(ctx->fin);
fseek(ctx->fin, 0, SEEK_SET);
buf = malloc(size);
fread(buf, 1, size, ctx->fin);
ImxVpuEncodedFrame encoded_frame;
encoded_frame.data.virtual_address = buf;
encoded_frame.data_size = size;
/* Codec data is out-of-band data that is typically stored in a separate space
* in containers for each elementary stream; JPEG data does not need it */
encoded_frame.codec_data = NULL;
encoded_frame.codec_data_size = 0;
fprintf(stderr, "encoded input frame: size: %u byte\n", encoded_frame.data_size);
/* Perform the actual decoding */
imx_vpu_dec_decode(ctx->vpudec, &encoded_frame, &output_code);
free(buf);
}
/* Initial info is now available; this usually happens right after the
* first frame is decoded, and this is the situation where one must register
* output framebuffers, which the decoder then uses like a buffer pool for
* picking buffers to decode frame into */
if (output_code & IMX_VPU_DEC_OUTPUT_CODE_INITIAL_INFO_AVAILABLE)
{
unsigned int i;
imx_vpu_dec_get_initial_info(ctx->vpudec, &(ctx->initial_info));
fprintf(
stderr,
"initial info: size: %ux%u pixel rate: %u/%u min num required framebuffers: %u interlacing: %d framebuffer alignment: %u color format: ",
ctx->initial_info.frame_width,
ctx->initial_info.frame_height,
ctx->initial_info.frame_rate_numerator,
ctx->initial_info.frame_rate_denominator,
ctx->initial_info.min_num_required_framebuffers,
ctx->initial_info.interlacing,
ctx->initial_info.framebuffer_alignment
);
switch (ctx->initial_info.color_format)
{
case IMX_VPU_COLOR_FORMAT_YUV420: fprintf(stderr, "YUV 4:2:0"); break;
case IMX_VPU_COLOR_FORMAT_YUV422_HORIZONTAL: fprintf(stderr, "YUV 4:2:2 horizontal"); break;
case IMX_VPU_COLOR_FORMAT_YUV422_VERTICAL: fprintf(stderr, "YUV 4:2:2 vertical"); break;
case IMX_VPU_COLOR_FORMAT_YUV444: fprintf(stderr, "YUV 4:4:4"); break;
case IMX_VPU_COLOR_FORMAT_YUV400: fprintf(stderr, "YUV 4:0:0 (8-bit grayscale)"); break;
}
fprintf(stderr, "\n");
ctx->num_framebuffers = ctx->initial_info.min_num_required_framebuffers;
imx_vpu_calc_framebuffer_sizes(ctx->initial_info.color_format, ctx->initial_info.frame_width, ctx->initial_info.frame_height, ctx->initial_info.framebuffer_alignment, ctx->initial_info.interlacing, &(ctx->calculated_sizes));
fprintf(
stderr,
"calculated sizes: frame width&height: %dx%d Y stride: %u CbCr stride: %u Y size: %u CbCr size: %u MvCol size: %u total size: %u\n",
ctx->calculated_sizes.aligned_frame_width, ctx->calculated_sizes.aligned_frame_height,
ctx->calculated_sizes.y_stride, ctx->calculated_sizes.cbcr_stride,
ctx->calculated_sizes.y_size, ctx->calculated_sizes.cbcr_size, ctx->calculated_sizes.mvcol_size,
ctx->calculated_sizes.total_size
);
ctx->framebuffers = malloc(sizeof(ImxVpuFramebuffer) * ctx->num_framebuffers);
ctx->fb_dmabuffers = malloc(sizeof(ImxVpuDMABuffer*) * ctx->num_framebuffers);
for (i = 0; i < ctx->num_framebuffers; ++i)
{
/* Allocate a DMA buffer for each framebuffer. It is possible to specify alternate allocators;
* all that is required is that the allocator provides physically contiguous memory
* (necessary for DMA transfers) and respecs the alignment value. */
ctx->fb_dmabuffers[i] = imx_vpu_dma_buffer_allocate(imx_vpu_dec_get_default_allocator(), ctx->calculated_sizes.total_size, ctx->initial_info.framebuffer_alignment, 0);
imx_vpu_fill_framebuffer_params(&(ctx->framebuffers[i]), &(ctx->calculated_sizes), ctx->fb_dmabuffers[i], 0);
}
/* Actual registration is done here. From this moment on, the VPU knows which buffers to use for
* storing decoded pictures into. This call must not be done again until decoding is shut down or
* IMX_VPU_DEC_OUTPUT_CODE_INITIAL_INFO_AVAILABLE is set again. */
imx_vpu_dec_register_framebuffers(ctx->vpudec, ctx->framebuffers, ctx->num_framebuffers);
}
/* Enable drain mode. All available input data is
* inserted. Now We want one output picture. */
imx_vpu_dec_enable_drain_mode(ctx->vpudec, 1);
/* Get the decoded picture out of the VPU */
{
ImxVpuEncodedFrame encoded_frame;
/* In drain mode there is no input data */
encoded_frame.data.virtual_address = NULL;
encoded_frame.data_size = 0;
encoded_frame.codec_data = NULL;
encoded_frame.codec_data_size = 0;
encoded_frame.context = NULL;
imx_vpu_dec_decode(ctx->vpudec, &encoded_frame, &output_code);
/* A decoded picture is available for further processing. Retrieve it, do something
* with it, and once the picture is no longer needed, mark it as displayed. This
* marks it internally as available for further decoding by the VPU. */
if (output_code & IMX_VPU_DEC_OUTPUT_CODE_DECODED_PICTURE_AVAILABLE)
{
ImxVpuPicture decoded_picture;
uint8_t *mapped_virtual_address;
size_t num_out_byte = ctx->calculated_sizes.y_size + ctx->calculated_sizes.cbcr_size * 2;
/* This call retrieves information about the decoded picture, including
* a pointer to the corresponding framebuffer structure. This must not be called more
* than once after IMX_VPU_DEC_OUTPUT_CODE_DECODED_PICTURE_AVAILABLE was set. */
imx_vpu_dec_get_decoded_picture(ctx->vpudec, &decoded_picture);
fprintf(stderr, "decoded output picture: writing %u byte", num_out_byte);
/* Map buffer to the local address space, dump the decoded frame to file,
* and unmap again. The decoded frame uses the I420 color format for all
* bitstream formats (h.264, MPEG2 etc.), with one exception; with motion JPEG data,
* the format can be different. See imxvpuapi.h for details. */
mapped_virtual_address = imx_vpu_dma_buffer_map(decoded_picture.framebuffer->dma_buffer, IMX_VPU_MAPPING_FLAG_READ_ONLY);
fwrite(mapped_virtual_address, 1, num_out_byte, ctx->fout);
imx_vpu_dma_buffer_unmap(decoded_picture.framebuffer->dma_buffer);
/* Mark the framebuffer as displayed, thus returning it to the list of
*framebuffers available for decoding. */
imx_vpu_dec_mark_framebuffer_as_displayed(ctx->vpudec, decoded_picture.framebuffer);
}
}
return RETVAL_OK;
}
