973b1a6b90
Some of context fields which must be overrided by this wrapper decoder may be set and used by user, so we have to save and restore them before and after invoking the inner decoder to secure user.
264 lines
7.6 KiB
C
264 lines
7.6 KiB
C
/*
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* Copyright (c) 2012, Xidorn Quan
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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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/**
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* @file
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* H.264 decoder via VDA
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* @author Xidorn Quan <quanxunzhen@gmail.com>
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*/
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#include <string.h>
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#include <CoreFoundation/CoreFoundation.h>
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#include "vda.h"
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#include "h264.h"
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#include "avcodec.h"
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#ifndef kCFCoreFoundationVersionNumber10_7
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#define kCFCoreFoundationVersionNumber10_7 635.00
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#endif
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extern AVCodec ff_h264_decoder, ff_h264_vda_decoder;
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static const enum AVPixelFormat vda_pixfmts_prior_10_7[] = {
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AV_PIX_FMT_UYVY422,
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_NONE
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};
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static const enum AVPixelFormat vda_pixfmts[] = {
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AV_PIX_FMT_UYVY422,
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AV_PIX_FMT_YUYV422,
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AV_PIX_FMT_NV12,
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_NONE
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};
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typedef struct {
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H264Context h264ctx;
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int h264_initialized;
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struct vda_context vda_ctx;
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enum AVPixelFormat pix_fmt;
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/* for backing-up fields set by user.
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* we have to gain full control of such fields here */
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void *hwaccel_context;
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enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
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int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
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#if FF_API_GET_BUFFER
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int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
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#endif
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} VDADecoderContext;
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static enum AVPixelFormat get_format(struct AVCodecContext *avctx,
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const enum AVPixelFormat *fmt)
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{
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return AV_PIX_FMT_VDA_VLD;
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}
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typedef struct {
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CVPixelBufferRef cv_buffer;
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} VDABufferContext;
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static void release_buffer(void *opaque, uint8_t *data)
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{
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VDABufferContext *context = opaque;
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CVPixelBufferUnlockBaseAddress(context->cv_buffer, 0);
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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 get_buffer2(AVCodecContext *avctx, AVFrame *pic, int flag)
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{
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VDABufferContext *context = av_mallocz(sizeof(VDABufferContext));
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AVBufferRef *buffer = av_buffer_create(NULL, 0, release_buffer, context, 0);
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if (!context || !buffer) {
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av_free(context);
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return AVERROR(ENOMEM);
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}
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pic->buf[0] = buffer;
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pic->data[0] = (void *)1;
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return 0;
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}
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static inline void set_context(AVCodecContext *avctx)
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{
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VDADecoderContext *ctx = avctx->priv_data;
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ctx->hwaccel_context = avctx->hwaccel_context;
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avctx->hwaccel_context = &ctx->vda_ctx;
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ctx->get_format = avctx->get_format;
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avctx->get_format = get_format;
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ctx->get_buffer2 = avctx->get_buffer2;
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avctx->get_buffer2 = get_buffer2;
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#if FF_API_GET_BUFFER
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ctx->get_buffer = avctx->get_buffer;
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avctx->get_buffer = NULL;
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#endif
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}
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static inline void restore_context(AVCodecContext *avctx)
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{
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VDADecoderContext *ctx = avctx->priv_data;
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avctx->hwaccel_context = ctx->hwaccel_context;
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avctx->get_format = ctx->get_format;
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avctx->get_buffer2 = ctx->get_buffer2;
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#if FF_API_GET_BUFFER
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avctx->get_buffer = ctx->get_buffer;
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#endif
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}
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static int vdadec_decode(AVCodecContext *avctx,
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void *data, int *got_frame, AVPacket *avpkt)
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{
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VDADecoderContext *ctx = avctx->priv_data;
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AVFrame *pic = data;
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int ret;
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set_context(avctx);
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ret = ff_h264_decoder.decode(avctx, data, got_frame, avpkt);
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restore_context(avctx);
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if (*got_frame) {
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AVBufferRef *buffer = pic->buf[0];
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VDABufferContext *context = av_buffer_get_opaque(buffer);
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CVPixelBufferRef cv_buffer = (CVPixelBufferRef)pic->data[3];
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CVPixelBufferRetain(cv_buffer);
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CVPixelBufferLockBaseAddress(cv_buffer, 0);
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context->cv_buffer = cv_buffer;
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pic->format = ctx->pix_fmt;
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if (CVPixelBufferIsPlanar(cv_buffer)) {
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int i, count = CVPixelBufferGetPlaneCount(cv_buffer);
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av_assert0(count < 4);
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for (i = 0; i < count; i++) {
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pic->data[i] = CVPixelBufferGetBaseAddressOfPlane(cv_buffer, i);
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pic->linesize[i] = CVPixelBufferGetBytesPerRowOfPlane(cv_buffer, i);
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}
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} else {
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pic->data[0] = CVPixelBufferGetBaseAddress(cv_buffer);
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pic->linesize[0] = CVPixelBufferGetBytesPerRow(cv_buffer);
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}
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}
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avctx->pix_fmt = ctx->pix_fmt;
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return ret;
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}
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static av_cold int vdadec_close(AVCodecContext *avctx)
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{
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VDADecoderContext *ctx = avctx->priv_data;
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/* release buffers and decoder */
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ff_vda_destroy_decoder(&ctx->vda_ctx);
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/* close H.264 decoder */
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if (ctx->h264_initialized) {
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set_context(avctx);
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ff_h264_decoder.close(avctx);
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restore_context(avctx);
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}
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return 0;
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}
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static av_cold int vdadec_init(AVCodecContext *avctx)
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{
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VDADecoderContext *ctx = avctx->priv_data;
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struct vda_context *vda_ctx = &ctx->vda_ctx;
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OSStatus status;
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int ret;
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ctx->h264_initialized = 0;
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/* init pix_fmts of codec */
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if (!ff_h264_vda_decoder.pix_fmts) {
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if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber10_7)
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ff_h264_vda_decoder.pix_fmts = vda_pixfmts_prior_10_7;
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else
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ff_h264_vda_decoder.pix_fmts = vda_pixfmts;
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}
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/* init vda */
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memset(vda_ctx, 0, sizeof(struct vda_context));
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vda_ctx->width = avctx->width;
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vda_ctx->height = avctx->height;
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vda_ctx->format = 'avc1';
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vda_ctx->use_sync_decoding = 1;
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vda_ctx->use_ref_buffer = 1;
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ctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
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switch (ctx->pix_fmt) {
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case AV_PIX_FMT_UYVY422:
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vda_ctx->cv_pix_fmt_type = '2vuy';
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break;
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case AV_PIX_FMT_YUYV422:
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vda_ctx->cv_pix_fmt_type = 'yuvs';
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break;
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case AV_PIX_FMT_NV12:
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vda_ctx->cv_pix_fmt_type = '420v';
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break;
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case AV_PIX_FMT_YUV420P:
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vda_ctx->cv_pix_fmt_type = 'y420';
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format: %d\n", avctx->pix_fmt);
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goto failed;
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}
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status = ff_vda_create_decoder(vda_ctx,
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avctx->extradata, avctx->extradata_size);
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if (status != kVDADecoderNoErr) {
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av_log(avctx, AV_LOG_ERROR,
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"Failed to init VDA decoder: %d.\n", status);
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goto failed;
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}
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/* init H.264 decoder */
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set_context(avctx);
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ret = ff_h264_decoder.init(avctx);
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restore_context(avctx);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Failed to open H.264 decoder.\n");
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goto failed;
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}
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ctx->h264_initialized = 1;
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return 0;
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failed:
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vdadec_close(avctx);
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return -1;
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}
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static void vdadec_flush(AVCodecContext *avctx)
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{
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set_context(avctx);
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ff_h264_decoder.flush(avctx);
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restore_context(avctx);
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}
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AVCodec ff_h264_vda_decoder = {
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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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.priv_data_size = sizeof(VDADecoderContext),
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.init = vdadec_init,
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.close = vdadec_close,
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.decode = vdadec_decode,
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.capabilities = CODEC_CAP_DELAY,
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.flush = vdadec_flush,
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.long_name = NULL_IF_CONFIG_SMALL("H.264 (VDA acceleration)"),
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};
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