On Mon, Jul 6, 2020 at 10:56 AM Yongle Lin <yongle.lin...@gmail.com> wrote:
>
>
> On Thu, Jun 25, 2020 at 12:09 PM Yongle Lin <yongle.lin...@gmail.com>
> wrote:
>
>> Add qp visualization in codecview filter which supports H264 and VP9
>> codecs. Add options for luma/chroma qp and AC/DC qp as well. There is a old
>> way to visualize it but it's deprecated since version 58.
>> example command line to visualize qp:
>> ./ffmpeg -export_side_data +venc_params -i input.mp4 -vf
>> codecview=qp=true output.mp4
>> ---
>> doc/filters.texi | 6 ++++
>> libavfilter/vf_codecview.c | 69 +++++++++++++++++++++++++++++++++++++-
>> 2 files changed, 74 insertions(+), 1 deletion(-)
>>
>> diff --git a/doc/filters.texi b/doc/filters.texi
>> index 84567dec16..f4a57e993f 100644
>> --- a/doc/filters.texi
>> +++ b/doc/filters.texi
>> @@ -7285,6 +7285,12 @@ backward predicted MVs of B-frames
>> @item qp
>> Display quantization parameters using the chroma planes.
>>
>> +@item chroma_qp
>> +Display chroma quantization parameters (default luma qp) using the
>> chroma planes. Should use with qp option. (e.g.
>> codecview=qp=true:chroma_qp=true)
>> +
>> +@item dc_qp
>> +Display DC quantization parameters (default AC qp) using the chroma
>> planes. Should use with qp option. (e.g. codecview=qp=true:dc_qp=true)
>> +
>> @item mv_type, mvt
>> Set motion vectors type to visualize. Includes MVs from all frames
>> unless specified by @var{frame_type} option.
>>
>> diff --git a/libavfilter/vf_codecview.c b/libavfilter/vf_codecview.c
>> index 331bfba777..f585dfe28e 100644
>> --- a/libavfilter/vf_codecview.c
>> +++ b/libavfilter/vf_codecview.c
>> @@ -34,6 +34,7 @@
>> #include "libavutil/opt.h"
>> #include "avfilter.h"
>> #include "internal.h"
>> +#include "libavutil/video_enc_params.h"
>>
>> #define MV_P_FOR (1<<0)
>> #define MV_B_FOR (1<<1)
>> @@ -51,6 +52,8 @@ typedef struct CodecViewContext {
>> unsigned mv_type;
>> int hsub, vsub;
>> int qp;
>> + int chroma_qp;
>> + int dc_qp;
>> } CodecViewContext;
>>
>> #define OFFSET(x) offsetof(CodecViewContext, x)
>> @@ -63,6 +66,8 @@ static const AVOption codecview_options[] = {
>> CONST("bf", "forward predicted MVs of B-frames", MV_B_FOR,
>> "mv"),
>> CONST("bb", "backward predicted MVs of B-frames", MV_B_BACK,
>> "mv"),
>> { "qp", NULL, OFFSET(qp), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags =
>> FLAGS },
>> + { "chroma_qp", NULL, OFFSET(chroma_qp), AV_OPT_TYPE_BOOL, {.i64=0},
>> 0, 1, .flags = FLAGS },
>> + { "dc_qp", NULL, OFFSET(dc_qp), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,
>> .flags = FLAGS },
>> { "mv_type", "set motion vectors type", OFFSET(mv_type),
>> AV_OPT_TYPE_FLAGS, {.i64=0}, 0, INT_MAX, FLAGS, "mv_type" },
>> { "mvt", "set motion vectors type", OFFSET(mv_type),
>> AV_OPT_TYPE_FLAGS, {.i64=0}, 0, INT_MAX, FLAGS, "mv_type" },
>> CONST("fp", "forward predicted MVs", MV_TYPE_FOR, "mv_type"),
>> @@ -212,6 +217,52 @@ static void draw_arrow(uint8_t *buf, int sx, int sy,
>> int ex,
>> draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
>> }
>>
>> +static int qp_color_calculate(int qp, enum AVVideoEncParamsType type) {
>> + return type == AV_VIDEO_ENC_PARAMS_H264 ? qp * 128 / 31 : qp;
>> +}
>> +
>> +static void get_block_color(AVVideoEncParams *par, AVVideoBlockParams
>> *b, CodecViewContext *s, enum AVColorRange color_range, int *cu, int *cv)
>> +{
>> + const int plane_qp_cu_index = s->chroma_qp ? 1 : 0;
>> + const int plane_qp_cv_index = s->chroma_qp ? 2 : 0;
>> + const int ac_dc_index = s->dc_qp ? 0 : 1;
>> + *cu = qp_color_calculate(par->qp +
>> par->delta_qp[plane_qp_cu_index][ac_dc_index] + b->delta_qp, par->type);
>> + *cv = qp_color_calculate(par->qp +
>> par->delta_qp[plane_qp_cv_index][ac_dc_index] + b->delta_qp, par->type);
>> + if (color_range == AVCOL_RANGE_MPEG) {
>> + // map jpeg color range(0-255) to mpeg color range(16-235)
>> + *cu = av_rescale(*cu, 73, 85) + 16;
>> + *cv = av_rescale(*cv, 73, 85) + 16;
>> + }
>> +}
>> +
>> +static void color_block(AVFrame *frame, CodecViewContext *s, const int
>> src_x, const int src_y, const int b_w, const int b_h, const int cu, const
>> int cv)
>> +{
>> + const int w = AV_CEIL_RSHIFT(frame->width, s->hsub);
>> + const int h = AV_CEIL_RSHIFT(frame->height, s->vsub);
>> + const int lzu = frame->linesize[1];
>> + const int lzv = frame->linesize[2];
>> +
>> + const int plane_src_x = src_x >> s->hsub;
>> + const int plane_src_y = src_y >> s->vsub;
>> + const int plane_b_w = b_w >> s->hsub;
>> + const int plane_b_h = b_h >> s->vsub;
>> + uint8_t *pu = frame->data[1] + plane_src_y * lzu;
>> + uint8_t *pv = frame->data[2] + plane_src_y * lzv;
>> +
>> + for (int y = plane_src_y; y < plane_src_y + plane_b_h; y++) {
>> + for (int x = plane_src_x; x < plane_src_x + plane_b_w; x++) {
>> + if (x >= w)
>> + break;
>> + pu[x] = cu;
>> + pv[x] = cv;
>> + }
>> + if (y >= h)
>> + break;
>> + pu += lzu;
>> + pv += lzv;
>> + }
>> +}
>> +
>> static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
>> {
>> AVFilterContext *ctx = inlink->dst;
>> @@ -240,8 +291,24 @@ static int filter_frame(AVFilterLink *inlink,
>> AVFrame *frame)
>> pv += lzv;
>> }
>> }
>> - }
>>
>> + AVFrameSideData *sd = av_frame_get_side_data(frame,
>> AV_FRAME_DATA_VIDEO_ENC_PARAMS);
>> + if (sd) {
>> + AVVideoEncParams *par = (AVVideoEncParams*)sd->data;
>> +
>> + if (par->nb_blocks) {
>> + for (int i = 0; i < par->nb_blocks; i++) {
>> + AVVideoBlockParams *b =
>> av_video_enc_params_block(par, i);
>> + int cu, cv;
>> + get_block_color(par, b, s, frame->color_range, &cu,
>> &cv);
>> + color_block(frame, s, b->src_x, b->src_y, b->w,
>> b->h, cu, cv);
>> + }
>> + } else {
>> + const c = qp_color_calculate(par->qp, par->type);
>> + color_block(frame, s, 0, 0, frame->width, frame->height,
>> c, c);
>> + }
>> + }
>> + }
>> if (s->mv || s->mv_type) {
>> AVFrameSideData *sd = av_frame_get_side_data(frame,
>> AV_FRAME_DATA_MOTION_VECTORS);
>> if (sd) {
>> --
>> 2.27.0.111.gc72c7da667-goog
>>
>>
> Dear FFmpeg Developers,
>
> Could you please review this patch when you have time. Thanks.
>
> Best,
> Yongle
>
Dear FFmpeg Developers,
I think it is helpful to enable quantization parameters visualization in
FFmpeg. Could you please review this patch, thanks a lot.
Best Regards,
Yongle
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