yading@10: /*
yading@10:  * VDA H264 HW acceleration.
yading@10:  *
yading@10:  * copyright (c) 2011 Sebastien Zwickert
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <CoreFoundation/CFDictionary.h>
yading@10: #include <CoreFoundation/CFNumber.h>
yading@10: #include <CoreFoundation/CFData.h>
yading@10: 
yading@10: #include "vda.h"
yading@10: #include "libavutil/avutil.h"
yading@10: #include "h264.h"
yading@10: 
yading@10: 
yading@10: /* Decoder callback that adds the vda frame to the queue in display order. */
yading@10: static void vda_decoder_callback (void *vda_hw_ctx,
yading@10:                                   CFDictionaryRef user_info,
yading@10:                                   OSStatus status,
yading@10:                                   uint32_t infoFlags,
yading@10:                                   CVImageBufferRef image_buffer)
yading@10: {
yading@10:     struct vda_context *vda_ctx = vda_hw_ctx;
yading@10: 
yading@10:     if (!image_buffer)
yading@10:         return;
yading@10: 
yading@10:     if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
yading@10:         return;
yading@10: 
yading@10:     vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
yading@10: }
yading@10: 
yading@10: static int vda_sync_decode(struct vda_context *vda_ctx)
yading@10: {
yading@10:     OSStatus status;
yading@10:     CFDataRef coded_frame;
yading@10:     uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
yading@10: 
yading@10:     coded_frame = CFDataCreate(kCFAllocatorDefault,
yading@10:                                vda_ctx->priv_bitstream,
yading@10:                                vda_ctx->priv_bitstream_size);
yading@10: 
yading@10:     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
yading@10: 
yading@10:     if (kVDADecoderNoErr == status)
yading@10:         status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
yading@10: 
yading@10:     CFRelease(coded_frame);
yading@10: 
yading@10:     return status;
yading@10: }
yading@10: 
yading@10: 
yading@10: static int vda_h264_start_frame(AVCodecContext *avctx,
yading@10:                                 av_unused const uint8_t *buffer,
yading@10:                                 av_unused uint32_t size)
yading@10: {
yading@10:     struct vda_context *vda_ctx = avctx->hwaccel_context;
yading@10: 
yading@10:     if (!vda_ctx->decoder)
yading@10:         return -1;
yading@10: 
yading@10:     vda_ctx->priv_bitstream_size = 0;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int vda_h264_decode_slice(AVCodecContext *avctx,
yading@10:                                  const uint8_t *buffer,
yading@10:                                  uint32_t size)
yading@10: {
yading@10:     struct vda_context *vda_ctx = avctx->hwaccel_context;
yading@10:     void *tmp;
yading@10: 
yading@10:     if (!vda_ctx->decoder)
yading@10:         return -1;
yading@10: 
yading@10:     tmp = av_fast_realloc(vda_ctx->priv_bitstream,
yading@10:                           &vda_ctx->priv_allocated_size,
yading@10:                           vda_ctx->priv_bitstream_size + size + 4);
yading@10:     if (!tmp)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     vda_ctx->priv_bitstream = tmp;
yading@10: 
yading@10:     AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
yading@10:     memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
yading@10: 
yading@10:     vda_ctx->priv_bitstream_size += size + 4;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int vda_h264_end_frame(AVCodecContext *avctx)
yading@10: {
yading@10:     H264Context *h                      = avctx->priv_data;
yading@10:     struct vda_context *vda_ctx         = avctx->hwaccel_context;
yading@10:     AVFrame *frame                      = &h->cur_pic_ptr->f;
yading@10:     int status;
yading@10: 
yading@10:     if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
yading@10:         return -1;
yading@10: 
yading@10:     status = vda_sync_decode(vda_ctx);
yading@10:     frame->data[3] = (void*)vda_ctx->cv_buffer;
yading@10: 
yading@10:     if (status)
yading@10:         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
yading@10: 
yading@10:     return status;
yading@10: }
yading@10: 
yading@10: int ff_vda_create_decoder(struct vda_context *vda_ctx,
yading@10:                           uint8_t *extradata,
yading@10:                           int extradata_size)
yading@10: {
yading@10:     OSStatus status;
yading@10:     CFNumberRef height;
yading@10:     CFNumberRef width;
yading@10:     CFNumberRef format;
yading@10:     CFDataRef avc_data;
yading@10:     CFMutableDictionaryRef config_info;
yading@10:     CFMutableDictionaryRef buffer_attributes;
yading@10:     CFMutableDictionaryRef io_surface_properties;
yading@10:     CFNumberRef cv_pix_fmt;
yading@10: 
yading@10:     vda_ctx->priv_bitstream = NULL;
yading@10:     vda_ctx->priv_allocated_size = 0;
yading@10: 
yading@10:     /* Each VCL NAL in the bitstream sent to the decoder
yading@10:      * is preceded by a 4 bytes length header.
yading@10:      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
yading@10:     if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
yading@10:         uint8_t *rw_extradata;
yading@10: 
yading@10:         if (!(rw_extradata = av_malloc(extradata_size)))
yading@10:             return AVERROR(ENOMEM);
yading@10: 
yading@10:         memcpy(rw_extradata, extradata, extradata_size);
yading@10: 
yading@10:         rw_extradata[4] |= 0x03;
yading@10: 
yading@10:         avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
yading@10: 
yading@10:         av_freep(&rw_extradata);
yading@10:     } else {
yading@10:         avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
yading@10:     }
yading@10: 
yading@10:     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
yading@10:                                             4,
yading@10:                                             &kCFTypeDictionaryKeyCallBacks,
yading@10:                                             &kCFTypeDictionaryValueCallBacks);
yading@10: 
yading@10:     height   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
yading@10:     width    = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
yading@10:     format   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
yading@10: 
yading@10:     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
yading@10:     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
yading@10:     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
yading@10:     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
yading@10: 
yading@10:     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
yading@10:                                                   2,
yading@10:                                                   &kCFTypeDictionaryKeyCallBacks,
yading@10:                                                   &kCFTypeDictionaryValueCallBacks);
yading@10:     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
yading@10:                                                       0,
yading@10:                                                       &kCFTypeDictionaryKeyCallBacks,
yading@10:                                                       &kCFTypeDictionaryValueCallBacks);
yading@10:     cv_pix_fmt  = CFNumberCreate(kCFAllocatorDefault,
yading@10:                                  kCFNumberSInt32Type,
yading@10:                                  &vda_ctx->cv_pix_fmt_type);
yading@10:     CFDictionarySetValue(buffer_attributes,
yading@10:                          kCVPixelBufferPixelFormatTypeKey,
yading@10:                          cv_pix_fmt);
yading@10:     CFDictionarySetValue(buffer_attributes,
yading@10:                          kCVPixelBufferIOSurfacePropertiesKey,
yading@10:                          io_surface_properties);
yading@10: 
yading@10:     status = VDADecoderCreate(config_info,
yading@10:                               buffer_attributes,
yading@10:                               vda_decoder_callback,
yading@10:                               vda_ctx,
yading@10:                               &vda_ctx->decoder);
yading@10: 
yading@10:     CFRelease(height);
yading@10:     CFRelease(width);
yading@10:     CFRelease(format);
yading@10:     CFRelease(avc_data);
yading@10:     CFRelease(config_info);
yading@10:     CFRelease(io_surface_properties);
yading@10:     CFRelease(cv_pix_fmt);
yading@10:     CFRelease(buffer_attributes);
yading@10: 
yading@10:     return status;
yading@10: }
yading@10: 
yading@10: int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
yading@10: {
yading@10:     OSStatus status = kVDADecoderNoErr;
yading@10: 
yading@10:     if (vda_ctx->decoder)
yading@10:         status = VDADecoderDestroy(vda_ctx->decoder);
yading@10: 
yading@10:     av_freep(&vda_ctx->priv_bitstream);
yading@10: 
yading@10:     return status;
yading@10: }
yading@10: 
yading@10: AVHWAccel ff_h264_vda_hwaccel = {
yading@10:     .name           = "h264_vda",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_H264,
yading@10:     .pix_fmt        = AV_PIX_FMT_VDA_VLD,
yading@10:     .start_frame    = vda_h264_start_frame,
yading@10:     .decode_slice   = vda_h264_decode_slice,
yading@10:     .end_frame      = vda_h264_end_frame,
yading@10: };