[FFmpeg-devel] [PATCH 6/7] libavfilter/vf_sr.c: Removes uint8 -> float and float -> uint8 conversions.
Sergey Lavrushkin
dualfal at gmail.com
Tue Aug 7 00:20:21 EEST 2018
Updated patch.
2018-08-02 21:52 GMT+03:00 Sergey Lavrushkin <dualfal at gmail.com>:
> This patch removes conversions, declared inside the sr filter, and uses
> libswscale inside
> the filter to perform them for only Y channel of input. The sr filter
> still has uint
> formats as input, as it does not use chroma channels in models and these
> channels are
> upscaled using libswscale, float formats for input would cause unnecessary
> conversions
> during scaling for these channels.
>
> ---
> libavfilter/vf_sr.c | 134 +++++++++++++++++++-----------
> ----------------------
> 1 file changed, 48 insertions(+), 86 deletions(-)
>
> diff --git a/libavfilter/vf_sr.c b/libavfilter/vf_sr.c
> index 944a0e28e7..5ad1baa4c0 100644
> --- a/libavfilter/vf_sr.c
> +++ b/libavfilter/vf_sr.c
> @@ -45,8 +45,8 @@ typedef struct SRContext {
> DNNModel *model;
> DNNData input, output;
> int scale_factor;
> - struct SwsContext *sws_context;
> - int sws_slice_h;
> + struct SwsContext *sws_contexts[3];
> + int sws_slice_h, sws_input_linesize, sws_output_linesize;
> } SRContext;
>
> #define OFFSET(x) offsetof(SRContext, x)
> @@ -95,6 +95,10 @@ static av_cold int init(AVFilterContext *context)
> return AVERROR(EIO);
> }
>
> + sr_context->sws_contexts[0] = NULL;
> + sr_context->sws_contexts[1] = NULL;
> + sr_context->sws_contexts[2] = NULL;
> +
> return 0;
> }
>
> @@ -110,6 +114,7 @@ static int query_formats(AVFilterContext *context)
> av_log(context, AV_LOG_ERROR, "could not create formats list\n");
> return AVERROR(ENOMEM);
> }
> +
> return ff_set_common_formats(context, formats_list);
> }
>
> @@ -140,21 +145,31 @@ static int config_props(AVFilterLink *inlink)
> else{
> outlink->h = sr_context->output.height;
> outlink->w = sr_context->output.width;
> + sr_context->sws_contexts[1] = sws_getContext(sr_context->input.width,
> sr_context->input.height, AV_PIX_FMT_GRAY8,
> +
> sr_context->input.width, sr_context->input.height, AV_PIX_FMT_GRAYF32,
> + 0, NULL, NULL, NULL);
> + sr_context->sws_input_linesize = sr_context->input.width << 2;
> + sr_context->sws_contexts[2] = sws_getContext(sr_context->output.width,
> sr_context->output.height, AV_PIX_FMT_GRAYF32,
> +
> sr_context->output.width, sr_context->output.height, AV_PIX_FMT_GRAY8,
> + 0, NULL, NULL, NULL);
> + sr_context->sws_output_linesize = sr_context->output.width << 2;
> + if (!sr_context->sws_contexts[1] || !sr_context->sws_contexts[2]){
> + av_log(context, AV_LOG_ERROR, "could not create SwsContext
> for conversions\n");
> + return AVERROR(ENOMEM);
> + }
> switch (sr_context->model_type){
> case SRCNN:
> - sr_context->sws_context = sws_getContext(inlink->w,
> inlink->h, inlink->format,
> - outlink->w,
> outlink->h, outlink->format, SWS_BICUBIC, NULL, NULL, NULL);
> - if (!sr_context->sws_context){
> - av_log(context, AV_LOG_ERROR, "could not create
> SwsContext\n");
> + sr_context->sws_contexts[0] = sws_getContext(inlink->w,
> inlink->h, inlink->format,
> + outlink->w,
> outlink->h, outlink->format,
> + SWS_BICUBIC,
> NULL, NULL, NULL);
> + if (!sr_context->sws_contexts[0]){
> + av_log(context, AV_LOG_ERROR, "could not create
> SwsContext for scaling\n");
> return AVERROR(ENOMEM);
> }
> sr_context->sws_slice_h = inlink->h;
> break;
> case ESPCN:
> - if (inlink->format == AV_PIX_FMT_GRAY8){
> - sr_context->sws_context = NULL;
> - }
> - else{
> + if (inlink->format != AV_PIX_FMT_GRAY8){
> sws_src_h = sr_context->input.height;
> sws_src_w = sr_context->input.width;
> sws_dst_h = sr_context->output.height;
> @@ -184,13 +199,14 @@ static int config_props(AVFilterLink *inlink)
> sws_dst_w = AV_CEIL_RSHIFT(sws_dst_w, 2);
> break;
> default:
> - av_log(context, AV_LOG_ERROR, "could not create
> SwsContext for input pixel format");
> + av_log(context, AV_LOG_ERROR, "could not create
> SwsContext for scaling for given input pixel format");
> return AVERROR(EIO);
> }
> - sr_context->sws_context = sws_getContext(sws_src_w,
> sws_src_h, AV_PIX_FMT_GRAY8,
> - sws_dst_w,
> sws_dst_h, AV_PIX_FMT_GRAY8, SWS_BICUBIC, NULL, NULL, NULL);
> - if (!sr_context->sws_context){
> - av_log(context, AV_LOG_ERROR, "could not create
> SwsContext\n");
> + sr_context->sws_contexts[0] = sws_getContext(sws_src_w,
> sws_src_h, AV_PIX_FMT_GRAY8,
> + sws_dst_w,
> sws_dst_h, AV_PIX_FMT_GRAY8,
> + SWS_BICUBIC,
> NULL, NULL, NULL);
> + if (!sr_context->sws_contexts[0]){
> + av_log(context, AV_LOG_ERROR, "could not create
> SwsContext for scaling\n");
> return AVERROR(ENOMEM);
> }
> sr_context->sws_slice_h = sws_src_h;
> @@ -201,61 +217,12 @@ static int config_props(AVFilterLink *inlink)
> }
> }
>
> -typedef struct ThreadData{
> - uint8_t *data;
> - int data_linesize, height, width;
> -} ThreadData;
> -
> -static int uint8_to_float(AVFilterContext *context, void *arg, int jobnr,
> int nb_jobs)
> -{
> - SRContext *sr_context = context->priv;
> - const ThreadData *td = arg;
> - const int slice_start = (td->height * jobnr ) / nb_jobs;
> - const int slice_end = (td->height * (jobnr + 1)) / nb_jobs;
> - const uint8_t *src = td->data + slice_start * td->data_linesize;
> - float *dst = sr_context->input.data + slice_start * td->width;
> - int y, x;
> -
> - for (y = slice_start; y < slice_end; ++y){
> - for (x = 0; x < td->width; ++x){
> - dst[x] = (float)src[x] / 255.0f;
> - }
> - src += td->data_linesize;
> - dst += td->width;
> - }
> -
> - return 0;
> -}
> -
> -static int float_to_uint8(AVFilterContext *context, void *arg, int jobnr,
> int nb_jobs)
> -{
> - SRContext *sr_context = context->priv;
> - const ThreadData *td = arg;
> - const int slice_start = (td->height * jobnr ) / nb_jobs;
> - const int slice_end = (td->height * (jobnr + 1)) / nb_jobs;
> - const float *src = sr_context->output.data + slice_start * td->width;
> - uint8_t *dst = td->data + slice_start * td->data_linesize;
> - int y, x;
> -
> - for (y = slice_start; y < slice_end; ++y){
> - for (x = 0; x < td->width; ++x){
> - dst[x] = (uint8_t)(255.0f * FFMIN(src[x], 1.0f));
> - }
> - src += td->width;
> - dst += td->data_linesize;
> - }
> -
> - return 0;
> -}
> -
> static int filter_frame(AVFilterLink *inlink, AVFrame *in)
> {
> AVFilterContext *context = inlink->dst;
> SRContext *sr_context = context->priv;
> AVFilterLink *outlink = context->outputs[0];
> AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
> - ThreadData td;
> - int nb_threads;
> DNNReturnType dnn_result;
>
> if (!out){
> @@ -268,28 +235,23 @@ static int filter_frame(AVFilterLink *inlink,
> AVFrame *in)
> out->width = sr_context->output.width;
> switch (sr_context->model_type){
> case SRCNN:
> - sws_scale(sr_context->sws_context, (const uint8_t **)in->data,
> in->linesize,
> + sws_scale(sr_context->sws_contexts[0], (const uint8_t
> **)in->data, in->linesize,
> 0, sr_context->sws_slice_h, out->data, out->linesize);
> - td.data = out->data[0];
> - td.data_linesize = out->linesize[0];
> - td.height = out->height;
> - td.width = out->width;
> +
> + sws_scale(sr_context->sws_contexts[1], (const uint8_t
> **)out->data, out->linesize,
> + 0, out->height, (uint8_t * const*)(&sr_context->input.data),
> &sr_context->sws_input_linesize);
> break;
> case ESPCN:
> - if (sr_context->sws_context){
> - sws_scale(sr_context->sws_context, (const uint8_t
> **)(in->data + 1), in->linesize + 1,
> + if (sr_context->sws_contexts[0]){
> + sws_scale(sr_context->sws_contexts[0], (const uint8_t
> **)(in->data + 1), in->linesize + 1,
> 0, sr_context->sws_slice_h, out->data + 1,
> out->linesize + 1);
> - sws_scale(sr_context->sws_context, (const uint8_t
> **)(in->data + 2), in->linesize + 2,
> + sws_scale(sr_context->sws_contexts[0], (const uint8_t
> **)(in->data + 2), in->linesize + 2,
> 0, sr_context->sws_slice_h, out->data + 2,
> out->linesize + 2);
> }
> - td.data = in->data[0];
> - td.data_linesize = in->linesize[0];
> - td.height = in->height;
> - td.width = in->width;
> - }
>
> - nb_threads = ff_filter_get_nb_threads(context);
> - context->internal->execute(context, uint8_to_float, &td, NULL,
> FFMIN(td.height, nb_threads));
> + sws_scale(sr_context->sws_contexts[1], (const uint8_t
> **)in->data, in->linesize,
> + 0, in->height, (uint8_t * const*)(&sr_context->input.data),
> &sr_context->sws_input_linesize);
> + }
> av_frame_free(&in);
>
> dnn_result = (sr_context->dnn_module->execute_model)(sr_context->
> model);
> @@ -298,17 +260,15 @@ static int filter_frame(AVFilterLink *inlink,
> AVFrame *in)
> return AVERROR(EIO);
> }
>
> - td.data = out->data[0];
> - td.data_linesize = out->linesize[0];
> - td.height = out->height;
> - td.width = out->width;
> - context->internal->execute(context, float_to_uint8, &td, NULL,
> FFMIN(td.height, nb_threads));
> + sws_scale(sr_context->sws_contexts[2], (const uint8_t
> **)(&sr_context->output.data), &sr_context->sws_output_linesize,
> + 0, out->height, (uint8_t * const*)out->data, out->linesize);
>
> return ff_filter_frame(outlink, out);
> }
>
> static av_cold void uninit(AVFilterContext *context)
> {
> + int i;
> SRContext *sr_context = context->priv;
>
> if (sr_context->dnn_module){
> @@ -316,8 +276,10 @@ static av_cold void uninit(AVFilterContext *context)
> av_freep(&sr_context->dnn_module);
> }
>
> - if (sr_context->sws_context){
> - sws_freeContext(sr_context->sws_context);
> + for (i = 0; i < 3; ++i){
> + if (sr_context->sws_contexts[i]){
> + sws_freeContext(sr_context->sws_contexts[i]);
> + }
> }
> }
>
> --
> 2.14.1
>
>
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