Re: [FFmpeg-devel] [PATCH] libavcodec/qsvdec.c: extract frame packing arrangement data

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

On Tue, 2022-04-26 at 18:00 +0800, Wenbin Chen wrote:
> Use h264_sei to parse SEI data got from MediaSDK. Extract frame
> packing arrangement information from SEI data and config AVStereo3D
> side data for decoded frame.
> 
> Signed-off-by: Wenbin Chen <wenbin.chen@intel.com>
> Signed-off-by: Tong Wu <tong1.wu@intel.com>
> ---
>  libavcodec/qsv_internal.h |   2 +
>  libavcodec/qsvdec.c       | 160 ++++++++++++++++++++++++++++++++++++++
>  2 files changed, 162 insertions(+)
> 
> diff --git a/libavcodec/qsv_internal.h b/libavcodec/qsv_internal.h
> index e2aecdcbd6..a804c392c1 100644
> --- a/libavcodec/qsv_internal.h
> +++ b/libavcodec/qsv_internal.h
> @@ -54,6 +54,8 @@
>  
>  #define QSV_MAX_FRAME_EXT_PARAMS 4
>  
> +#define QSV_PAYLOAD_SIZE 1024
> +
>  #define QSV_VERSION_ATLEAST(MAJOR, MINOR)   \
>      (MFX_VERSION_MAJOR > (MAJOR) ||         \
>       MFX_VERSION_MAJOR == (MAJOR) && MFX_VERSION_MINOR >= (MINOR))
> diff --git a/libavcodec/qsvdec.c b/libavcodec/qsvdec.c
> index 5fc5bed4c8..26fa178b4d 100644
> --- a/libavcodec/qsvdec.c
> +++ b/libavcodec/qsvdec.c
> @@ -41,13 +41,16 @@
>  #include "libavutil/time.h"
>  #include "libavutil/imgutils.h"
>  #include "libavutil/film_grain_params.h"
> +#include "libavutil/stereo3d.h"
>  
>  #include "avcodec.h"
>  #include "codec_internal.h"
>  #include "internal.h"
>  #include "decode.h"
>  #include "hwconfig.h"
> +#include "get_bits.h"
>  #include "qsv.h"
> +#include "h264_sei.h"
>  #include "qsv_internal.h"
>  
>  static const AVRational mfx_tb = { 1, 90000 };
> @@ -101,6 +104,10 @@ typedef struct QSVContext {
>  
>      mfxExtBuffer **ext_buffers;
>      int         nb_ext_buffers;
> +
> +    mfxPayload payload;
> +    H264SEIContext sei;
> +    H264ParamSets ps;
>  } QSVContext;
>  
>  static const AVCodecHWConfigInternal *const qsv_hw_configs[] = {
> @@ -600,6 +607,150 @@ static int qsv_export_film_grain(AVCodecContext *avctx,
> mfxExtAV1FilmGrainParam
>  }
>  #endif
>  
> +static int h264_decode_fpa(H264SEIFramePacking *fpa, AVFrame *frame)
> +{
> +    if (!fpa || !frame)
> +        return AVERROR(EINVAL);
> +
> +    if (!fpa->arrangement_cancel_flag &&
> +        fpa->arrangement_type <= 6 &&
> +        fpa->content_interpretation_type > 0 &&
> +        fpa->content_interpretation_type < 3) {
> +        AVStereo3D *stereo = av_stereo3d_create_side_data(frame);
> +        if (stereo) {
> +            switch (fpa->arrangement_type) {
> +            case 0:
> +                stereo->type = AV_STEREO3D_CHECKERBOARD;
> +                break;
> +            case 1:
> +                stereo->type = AV_STEREO3D_COLUMNS;
> +                break;
> +            case 2:
> +                stereo->type = AV_STEREO3D_LINES;
> +                break;
> +            case 3:
> +                if (fpa->quincunx_sampling_flag)
> +                    stereo->type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
> +                else
> +                    stereo->type = AV_STEREO3D_SIDEBYSIDE;
> +                break;
> +            case 4:
> +                stereo->type = AV_STEREO3D_TOPBOTTOM;
> +                break;
> +            case 5:
> +                stereo->type = AV_STEREO3D_FRAMESEQUENCE;
> +                if (fpa->current_frame_is_frame0_flag)
> +                    stereo->view = AV_STEREO3D_VIEW_LEFT;
> +                else
> +                    stereo->view = AV_STEREO3D_VIEW_RIGHT;
> +                break;
> +            case 6:
> +                stereo->type = AV_STEREO3D_2D;
> +                break;
> +            }
> +
> +            if (fpa->content_interpretation_type == 2)
> +                stereo->flags = AV_STEREO3D_FLAG_INVERT;
> +        }
> +    }
> +    return 0;
> +}
> +
> +static int h264_parse_side_data(AVCodecContext *avctx, QSVContext *q, AVFrame
> *frame)
> +{
> +    GetBitContext gb_payload;
> +    uint8_t *sei_buffer;
> +    int sei_buffer_index;
> +    int ret;
> +
> +    if (q->payload.Type != SEI_TYPE_FRAME_PACKING_ARRANGEMENT)
> +        return 0;
> +
> +    sei_buffer = (uint8_t *)av_mallocz(q->payload.NumBit / 8);
> +    if (!sei_buffer) {
> +        av_freep(&sei_buffer);
> +        return AVERROR(ENOMEM);
> +    }
> +    /* remove emulation prevention bytes */
> +    sei_buffer_index = 0;
> +    for (int i = 0; i < q->payload.NumBit / 8; i++) {
> +        if (q->payload.Data[i] == 3)
> +            i++;
> +        sei_buffer[sei_buffer_index] = q->payload.Data[i];
> +        sei_buffer_index += 1;
> +    }
> +
> +    ret = init_get_bits8(&gb_payload, sei_buffer, sei_buffer_index+1);
> +    if (ret < 0) {
> +        av_freep(&sei_buffer);
> +        return ret;
> +    }
> +
> +    ret = ff_h264_sei_decode(&q->sei, &gb_payload, &q->ps, avctx);
> +    if (ret < 0) {
> +        av_freep(&sei_buffer);
> +        return ret;
> +    }
> +
> +    switch (q->payload.Type) {
> +    case SEI_TYPE_FRAME_PACKING_ARRANGEMENT:
> +        ret = h264_decode_fpa(&q->sei.frame_packing, frame);
> +        break;
> +    default:
> +        break;
> +    }
> +
> +    av_freep(&sei_buffer);
> +    return ret;
> +}
> +
> +static int extract_frame_side_data(AVCodecContext *avctx, QSVContext *q,
> AVFrame *frame)
> +{
> +    mfxU64 ts;
> +    mfxStatus sts;
> +    int ret = 0;
> +
> +    if (q->payload.BufSize == 0) {
> +        q->payload.Data = av_mallocz(QSV_PAYLOAD_SIZE);
> +        if (!q->payload.Data)
> +            return AVERROR(ENOMEM);
> +        q->payload.BufSize = QSV_PAYLOAD_SIZE;
> +    }
> +
> +    sts = MFX_ERR_NONE;
> +    while (sts == MFX_ERR_NONE) {
> +
> +        sts = MFXVideoDECODE_GetPayload(q->session, &ts, &q->payload);
> +        if (sts == MFX_ERR_NOT_ENOUGH_BUFFER) {
> +            av_log(avctx, AV_LOG_WARNING, "Space for SEI is not enough."
> +                                          "Realloc buffer\n");
> +            if (q->payload.BufSize >= INT16_MAX / 2)
> +                return AVERROR(ENOMEM);
> +            q->payload.BufSize = q->payload.BufSize * 2;
> +            av_freep(&q->payload.Data);
> +            q->payload.Data = av_mallocz(q->payload.BufSize);
> +            if (!q->payload.Data)
> +                return AVERROR(ENOMEM);
> +            continue;
> +        } else if (sts != MFX_ERR_NONE || q->payload.NumBit == 0) {
> +            break;
> +        }
> +
> +        switch (avctx->codec_id) {
> +        case AV_CODEC_ID_H264:
> +            ret = h264_parse_side_data(avctx, q, frame);
> +            break;
> +        default:
> +            break;
> +        }
> +        if (ret < 0) {
> +            av_log(avctx, AV_LOG_WARNING, "parse side data failed\n");
> +            break;
> +        }
> +    }
> +    return ret;
> +}
> +
>  static int qsv_decode(AVCodecContext *avctx, QSVContext *q,
>                        AVFrame *frame, int *got_frame,
>                        const AVPacket *avpkt)
> @@ -709,6 +860,14 @@ static int qsv_decode(AVCodecContext *avctx, QSVContext
> *q,
>  
>          outsurf = &aframe.frame->surface;
>  
> +        ret = extract_frame_side_data(avctx, q, frame);
> +        if (ret == AVERROR_INVALIDDATA)
> +            av_log(avctx, AV_LOG_WARNING, "Side data is invalid\n");
> +        else if (ret < 0) {
> +            av_log(avctx, AV_LOG_ERROR, "Error extracting side data from
> packet\n");
> +            return ret;
> +        }
> +

The payload got from the SDK is in encoding order, however the frame returned
from MFXVideoDECODE_DecodeFrameAsync() is in display order, see the discussion
about MFXVideoDECODE_GetPayload() in 
https://github.com/Intel-Media-SDK/MediaSDK/issues/2597 . I think it would be
better to ask the SDK returns the corresponding info, like what they did in 
https://github.com/Intel-Media-SDK/MediaSDK/pull/2726 .

Thanks
Haihao



>          frame->pts = MFX_PTS_TO_PTS(outsurf->Data.TimeStamp, avctx-
> >pkt_timebase);
>  #if QSV_VERSION_ATLEAST(1, 34)
>          if ((avctx->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN) &&
> @@ -770,6 +929,7 @@ static void qsv_decode_close_qsvcontext(QSVContext *q)
>      av_buffer_unref(&q->frames_ctx.hw_frames_ctx);
>      av_buffer_unref(&q->frames_ctx.mids_buf);
>      av_buffer_pool_uninit(&q->pool);
> +    av_freep(&q->payload.Data);
>  }
>  
>  static int qsv_process_data(AVCodecContext *avctx, QSVContext *q,
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