/* * VDA H.264 hardware acceleration * * copyright (c) 2011 Sebastien Zwickert * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <CoreFoundation/CFNumber.h> #include <CoreFoundation/CFData.h> #include <CoreFoundation/CFString.h> #include "libavutil/avutil.h" #include "h264.h" #include "vda.h" /* Decoder callback that adds the VDA frame to the queue in display order. */ static void vda_decoder_callback(void *vda_hw_ctx, CFDictionaryRef user_info, OSStatus status, uint32_t infoFlags, CVImageBufferRef image_buffer) { struct vda_context *vda_ctx = vda_hw_ctx; if (!image_buffer) return; if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer)) return; vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer); } static int vda_sync_decode(struct vda_context *vda_ctx) { OSStatus status; CFDataRef coded_frame; uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames coded_frame = CFDataCreate(kCFAllocatorDefault, vda_ctx->priv_bitstream, vda_ctx->priv_bitstream_size); status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL); if (kVDADecoderNoErr == status) status = VDADecoderFlush(vda_ctx->decoder, flush_flags); CFRelease(coded_frame); return status; } static int vda_h264_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size) { struct vda_context *vda_ctx = avctx->hwaccel_context; if (!vda_ctx->decoder) return -1; vda_ctx->priv_bitstream_size = 0; return 0; } static int vda_h264_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) { struct vda_context *vda_ctx = avctx->hwaccel_context; void *tmp; if (!vda_ctx->decoder) return -1; tmp = av_fast_realloc(vda_ctx->priv_bitstream, &vda_ctx->priv_allocated_size, vda_ctx->priv_bitstream_size + size + 4); if (!tmp) return AVERROR(ENOMEM); vda_ctx->priv_bitstream = tmp; AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size); memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size); vda_ctx->priv_bitstream_size += size + 4; return 0; } static int vda_h264_end_frame(AVCodecContext *avctx) { H264Context *h = avctx->priv_data; struct vda_context *vda_ctx = avctx->hwaccel_context; AVFrame *frame = &h->cur_pic_ptr->f; int status; if (!vda_ctx->decoder || !vda_ctx->priv_bitstream) return -1; status = vda_sync_decode(vda_ctx); frame->data[3] = (void*)vda_ctx->cv_buffer; if (status) av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status); return status; } int ff_vda_create_decoder(struct vda_context *vda_ctx, uint8_t *extradata, int extradata_size) { OSStatus status = kVDADecoderNoErr; CFNumberRef height; CFNumberRef width; CFNumberRef format; CFDataRef avc_data; CFMutableDictionaryRef config_info; CFMutableDictionaryRef buffer_attributes; CFMutableDictionaryRef io_surface_properties; CFNumberRef cv_pix_fmt; /* Each VCL NAL in the bistream sent to the decoder * is preceded by a 4 bytes length header. * Change the avcC atom header if needed, to signal headers of 4 bytes. */ if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) { uint8_t *rw_extradata; if (!(rw_extradata = av_malloc(extradata_size))) return AVERROR(ENOMEM); memcpy(rw_extradata, extradata, extradata_size); rw_extradata[4] |= 0x03; avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size); av_freep(&rw_extradata); } else { avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size); } config_info = CFDictionaryCreateMutable(kCFAllocatorDefault, 4, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height); width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width); format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format); CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height); CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width); CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format); CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data); buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->cv_pix_fmt_type); CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt); CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties); status = VDADecoderCreate(config_info, buffer_attributes, vda_decoder_callback, vda_ctx, &vda_ctx->decoder); CFRelease(height); CFRelease(width); CFRelease(format); CFRelease(avc_data); CFRelease(config_info); CFRelease(io_surface_properties); CFRelease(cv_pix_fmt); CFRelease(buffer_attributes); return status; } int ff_vda_destroy_decoder(struct vda_context *vda_ctx) { OSStatus status = kVDADecoderNoErr; if (vda_ctx->decoder) status = VDADecoderDestroy(vda_ctx->decoder); av_freep(&vda_ctx->priv_bitstream); return status; } AVHWAccel ff_h264_vda_hwaccel = { .name = "h264_vda", .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_H264, .pix_fmt = AV_PIX_FMT_VDA_VLD, .start_frame = vda_h264_start_frame, .decode_slice = vda_h264_decode_slice, .end_frame = vda_h264_end_frame, };