267 lines
8.6 KiB
C
267 lines
8.6 KiB
C
/*
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* VDA H264 HW acceleration.
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*
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* copyright (c) 2011 Sebastien Zwickert
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <CoreFoundation/CFDictionary.h>
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#include <CoreFoundation/CFNumber.h>
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#include <CoreFoundation/CFData.h>
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#include "vda.h"
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#include "libavutil/avutil.h"
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#include "h264.h"
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struct vda_buffer {
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CVPixelBufferRef cv_buffer;
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};
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/* Decoder callback that adds the vda frame to the queue in display order. */
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static void vda_decoder_callback(void *vda_hw_ctx,
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CFDictionaryRef user_info,
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OSStatus status,
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uint32_t infoFlags,
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CVImageBufferRef image_buffer)
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{
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struct vda_context *vda_ctx = vda_hw_ctx;
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if (infoFlags & kVDADecodeInfo_FrameDropped)
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vda_ctx->cv_buffer = NULL;
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if (!image_buffer)
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return;
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if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
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return;
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vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
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}
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static int vda_sync_decode(struct vda_context *vda_ctx)
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{
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OSStatus status;
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CFDataRef coded_frame;
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uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
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coded_frame = CFDataCreate(kCFAllocatorDefault,
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vda_ctx->priv_bitstream,
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vda_ctx->priv_bitstream_size);
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status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
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if (kVDADecoderNoErr == status)
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status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
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CFRelease(coded_frame);
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return status;
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}
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static int vda_h264_start_frame(AVCodecContext *avctx,
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av_unused const uint8_t *buffer,
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av_unused uint32_t size)
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{
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struct vda_context *vda_ctx = avctx->hwaccel_context;
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if (!vda_ctx->decoder)
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return -1;
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vda_ctx->priv_bitstream_size = 0;
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return 0;
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}
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static int vda_h264_decode_slice(AVCodecContext *avctx,
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const uint8_t *buffer,
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uint32_t size)
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{
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struct vda_context *vda_ctx = avctx->hwaccel_context;
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void *tmp;
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if (!vda_ctx->decoder)
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return -1;
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tmp = av_fast_realloc(vda_ctx->priv_bitstream,
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&vda_ctx->priv_allocated_size,
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vda_ctx->priv_bitstream_size + size + 4);
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if (!tmp)
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return AVERROR(ENOMEM);
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vda_ctx->priv_bitstream = tmp;
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AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
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memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
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vda_ctx->priv_bitstream_size += size + 4;
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return 0;
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}
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static void vda_h264_release_buffer(void *opaque, uint8_t *data)
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{
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struct vda_buffer *context = opaque;
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CVPixelBufferRelease(context->cv_buffer);
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av_free(context);
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}
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static int vda_h264_end_frame(AVCodecContext *avctx)
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{
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H264Context *h = avctx->priv_data;
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struct vda_context *vda_ctx = avctx->hwaccel_context;
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AVFrame *frame = &h->cur_pic_ptr->f;
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struct vda_buffer *context;
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AVBufferRef *buffer;
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int status;
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if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
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return -1;
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status = vda_sync_decode(vda_ctx);
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frame->data[3] = (void*)vda_ctx->cv_buffer;
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if (status)
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av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
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if (!vda_ctx->use_ref_buffer || status)
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return status;
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context = av_mallocz(sizeof(*context));
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buffer = av_buffer_create(NULL, 0, vda_h264_release_buffer, context, 0);
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if (!context || !buffer) {
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CVPixelBufferRelease(vda_ctx->cv_buffer);
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av_free(context);
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return -1;
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}
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context->cv_buffer = vda_ctx->cv_buffer;
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frame->buf[3] = buffer;
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return status;
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}
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int ff_vda_create_decoder(struct vda_context *vda_ctx,
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uint8_t *extradata,
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int extradata_size)
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{
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OSStatus status;
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CFNumberRef height;
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CFNumberRef width;
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CFNumberRef format;
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CFDataRef avc_data;
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CFMutableDictionaryRef config_info;
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CFMutableDictionaryRef buffer_attributes;
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CFMutableDictionaryRef io_surface_properties;
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CFNumberRef cv_pix_fmt;
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vda_ctx->priv_bitstream = NULL;
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vda_ctx->priv_allocated_size = 0;
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/* Each VCL NAL in the bitstream sent to the decoder
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* is preceded by a 4 bytes length header.
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* Change the avcC atom header if needed, to signal headers of 4 bytes. */
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if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
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uint8_t *rw_extradata;
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if (!(rw_extradata = av_malloc(extradata_size)))
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return AVERROR(ENOMEM);
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memcpy(rw_extradata, extradata, extradata_size);
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rw_extradata[4] |= 0x03;
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avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
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av_freep(&rw_extradata);
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} else {
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avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
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}
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config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
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4,
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks);
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height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
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width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
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format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
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CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
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CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
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CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
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CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
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buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
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2,
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks);
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io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
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0,
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks);
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cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault,
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kCFNumberSInt32Type,
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&vda_ctx->cv_pix_fmt_type);
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CFDictionarySetValue(buffer_attributes,
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kCVPixelBufferPixelFormatTypeKey,
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cv_pix_fmt);
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CFDictionarySetValue(buffer_attributes,
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kCVPixelBufferIOSurfacePropertiesKey,
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io_surface_properties);
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status = VDADecoderCreate(config_info,
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buffer_attributes,
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vda_decoder_callback,
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vda_ctx,
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&vda_ctx->decoder);
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CFRelease(height);
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CFRelease(width);
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CFRelease(format);
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CFRelease(avc_data);
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CFRelease(config_info);
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CFRelease(io_surface_properties);
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CFRelease(cv_pix_fmt);
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CFRelease(buffer_attributes);
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return status;
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}
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int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
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{
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OSStatus status = kVDADecoderNoErr;
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if (vda_ctx->decoder)
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status = VDADecoderDestroy(vda_ctx->decoder);
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av_freep(&vda_ctx->priv_bitstream);
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return status;
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}
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AVHWAccel ff_h264_vda_hwaccel = {
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.name = "h264_vda",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_H264,
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.pix_fmt = AV_PIX_FMT_VDA_VLD,
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.start_frame = vda_h264_start_frame,
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.decode_slice = vda_h264_decode_slice,
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.end_frame = vda_h264_end_frame,
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};
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