1/* 2 * Copyright (c) 2012, Xidorn Quan 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * H.264 decoder via VDA 24 * @author Xidorn Quan <quanxunzhen@gmail.com> 25 */ 26 27#include <string.h> 28#include <CoreFoundation/CoreFoundation.h> 29 30#include "vda.h" 31#include "h264.h" 32#include "avcodec.h" 33 34#ifndef kCFCoreFoundationVersionNumber10_7 35#define kCFCoreFoundationVersionNumber10_7 635.00 36#endif 37 38extern AVCodec ff_h264_decoder, ff_h264_vda_decoder; 39 40static const enum AVPixelFormat vda_pixfmts_prior_10_7[] = { 41 AV_PIX_FMT_UYVY422, 42 AV_PIX_FMT_YUV420P, 43 AV_PIX_FMT_NONE 44}; 45 46static const enum AVPixelFormat vda_pixfmts[] = { 47 AV_PIX_FMT_UYVY422, 48 AV_PIX_FMT_YUYV422, 49 AV_PIX_FMT_NV12, 50 AV_PIX_FMT_YUV420P, 51 AV_PIX_FMT_NONE 52}; 53 54typedef struct { 55 H264Context h264ctx; 56 int h264_initialized; 57 struct vda_context vda_ctx; 58 enum AVPixelFormat pix_fmt; 59 60 /* for backing-up fields set by user. 61 * we have to gain full control of such fields here */ 62 void *hwaccel_context; 63 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt); 64 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags); 65#if FF_API_GET_BUFFER 66 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic); 67#endif 68} VDADecoderContext; 69 70static enum AVPixelFormat get_format(struct AVCodecContext *avctx, 71 const enum AVPixelFormat *fmt) 72{ 73 return AV_PIX_FMT_VDA_VLD; 74} 75 76typedef struct { 77 CVPixelBufferRef cv_buffer; 78} VDABufferContext; 79 80static void release_buffer(void *opaque, uint8_t *data) 81{ 82 VDABufferContext *context = opaque; 83 CVPixelBufferUnlockBaseAddress(context->cv_buffer, 0); 84 CVPixelBufferRelease(context->cv_buffer); 85 av_free(context); 86} 87 88static int get_buffer2(AVCodecContext *avctx, AVFrame *pic, int flag) 89{ 90 VDABufferContext *context = av_mallocz(sizeof(VDABufferContext)); 91 AVBufferRef *buffer = av_buffer_create(NULL, 0, release_buffer, context, 0); 92 if (!context || !buffer) { 93 av_free(context); 94 return AVERROR(ENOMEM); 95 } 96 97 pic->buf[0] = buffer; 98 pic->data[0] = (void *)1; 99 return 0; 100} 101 102static inline void set_context(AVCodecContext *avctx) 103{ 104 VDADecoderContext *ctx = avctx->priv_data; 105 ctx->hwaccel_context = avctx->hwaccel_context; 106 avctx->hwaccel_context = &ctx->vda_ctx; 107 ctx->get_format = avctx->get_format; 108 avctx->get_format = get_format; 109 ctx->get_buffer2 = avctx->get_buffer2; 110 avctx->get_buffer2 = get_buffer2; 111#if FF_API_GET_BUFFER 112 ctx->get_buffer = avctx->get_buffer; 113 avctx->get_buffer = NULL; 114#endif 115} 116 117static inline void restore_context(AVCodecContext *avctx) 118{ 119 VDADecoderContext *ctx = avctx->priv_data; 120 avctx->hwaccel_context = ctx->hwaccel_context; 121 avctx->get_format = ctx->get_format; 122 avctx->get_buffer2 = ctx->get_buffer2; 123#if FF_API_GET_BUFFER 124 avctx->get_buffer = ctx->get_buffer; 125#endif 126} 127 128static int vdadec_decode(AVCodecContext *avctx, 129 void *data, int *got_frame, AVPacket *avpkt) 130{ 131 VDADecoderContext *ctx = avctx->priv_data; 132 AVFrame *pic = data; 133 int ret; 134 135 set_context(avctx); 136 ret = ff_h264_decoder.decode(avctx, data, got_frame, avpkt); 137 restore_context(avctx); 138 if (*got_frame) { 139 AVBufferRef *buffer = pic->buf[0]; 140 VDABufferContext *context = av_buffer_get_opaque(buffer); 141 CVPixelBufferRef cv_buffer = (CVPixelBufferRef)pic->data[3]; 142 143 CVPixelBufferRetain(cv_buffer); 144 CVPixelBufferLockBaseAddress(cv_buffer, 0); 145 context->cv_buffer = cv_buffer; 146 pic->format = ctx->pix_fmt; 147 if (CVPixelBufferIsPlanar(cv_buffer)) { 148 int i, count = CVPixelBufferGetPlaneCount(cv_buffer); 149 av_assert0(count < 4); 150 for (i = 0; i < count; i++) { 151 pic->data[i] = CVPixelBufferGetBaseAddressOfPlane(cv_buffer, i); 152 pic->linesize[i] = CVPixelBufferGetBytesPerRowOfPlane(cv_buffer, i); 153 } 154 } else { 155 pic->data[0] = CVPixelBufferGetBaseAddress(cv_buffer); 156 pic->linesize[0] = CVPixelBufferGetBytesPerRow(cv_buffer); 157 } 158 } 159 avctx->pix_fmt = ctx->pix_fmt; 160 161 return ret; 162} 163 164static av_cold int vdadec_close(AVCodecContext *avctx) 165{ 166 VDADecoderContext *ctx = avctx->priv_data; 167 /* release buffers and decoder */ 168 ff_vda_destroy_decoder(&ctx->vda_ctx); 169 /* close H.264 decoder */ 170 if (ctx->h264_initialized) { 171 set_context(avctx); 172 ff_h264_decoder.close(avctx); 173 restore_context(avctx); 174 } 175 return 0; 176} 177 178static av_cold int vdadec_init(AVCodecContext *avctx) 179{ 180 VDADecoderContext *ctx = avctx->priv_data; 181 struct vda_context *vda_ctx = &ctx->vda_ctx; 182 OSStatus status; 183 int ret, i; 184 185 ctx->h264_initialized = 0; 186 187 /* init pix_fmts of codec */ 188 if (!ff_h264_vda_decoder.pix_fmts) { 189 if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber10_7) 190 ff_h264_vda_decoder.pix_fmts = vda_pixfmts_prior_10_7; 191 else 192 ff_h264_vda_decoder.pix_fmts = vda_pixfmts; 193 } 194 195 /* init vda */ 196 memset(vda_ctx, 0, sizeof(struct vda_context)); 197 vda_ctx->width = avctx->width; 198 vda_ctx->height = avctx->height; 199 vda_ctx->format = 'avc1'; 200 vda_ctx->use_sync_decoding = 1; 201 vda_ctx->use_ref_buffer = 1; 202 ctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts); 203 switch (ctx->pix_fmt) { 204 case AV_PIX_FMT_UYVY422: 205 vda_ctx->cv_pix_fmt_type = '2vuy'; 206 break; 207 case AV_PIX_FMT_YUYV422: 208 vda_ctx->cv_pix_fmt_type = 'yuvs'; 209 break; 210 case AV_PIX_FMT_NV12: 211 vda_ctx->cv_pix_fmt_type = '420v'; 212 break; 213 case AV_PIX_FMT_YUV420P: 214 vda_ctx->cv_pix_fmt_type = 'y420'; 215 break; 216 default: 217 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format: %d\n", avctx->pix_fmt); 218 goto failed; 219 } 220 status = ff_vda_create_decoder(vda_ctx, 221 avctx->extradata, avctx->extradata_size); 222 if (status != kVDADecoderNoErr) { 223 av_log(avctx, AV_LOG_ERROR, 224 "Failed to init VDA decoder: %d.\n", status); 225 goto failed; 226 } 227 228 /* init H.264 decoder */ 229 set_context(avctx); 230 ret = ff_h264_decoder.init(avctx); 231 restore_context(avctx); 232 if (ret < 0) { 233 av_log(avctx, AV_LOG_ERROR, "Failed to open H.264 decoder.\n"); 234 goto failed; 235 } 236 ctx->h264_initialized = 1; 237 238 for (i = 0; i < MAX_SPS_COUNT; i++) { 239 SPS *sps = ctx->h264ctx.sps_buffers[i]; 240 if (sps && (sps->bit_depth_luma != 8 || 241 sps->chroma_format_idc == 2 || 242 sps->chroma_format_idc == 3)) { 243 av_log(avctx, AV_LOG_ERROR, "Format is not supported.\n"); 244 goto failed; 245 } 246 } 247 248 return 0; 249 250failed: 251 vdadec_close(avctx); 252 return -1; 253} 254 255static void vdadec_flush(AVCodecContext *avctx) 256{ 257 set_context(avctx); 258 ff_h264_decoder.flush(avctx); 259 restore_context(avctx); 260} 261 262AVCodec ff_h264_vda_decoder = { 263 .name = "h264_vda", 264 .type = AVMEDIA_TYPE_VIDEO, 265 .id = AV_CODEC_ID_H264, 266 .priv_data_size = sizeof(VDADecoderContext), 267 .init = vdadec_init, 268 .close = vdadec_close, 269 .decode = vdadec_decode, 270 .capabilities = CODEC_CAP_DELAY, 271 .flush = vdadec_flush, 272 .long_name = NULL_IF_CONFIG_SMALL("H.264 (VDA acceleration)"), 273}; 274