e0561e2914de3efd7b1ca782c6faecf1955c2520
[ffmpeg.git] / libavcodec / vda_h264.c
1 /*
2  * VDA H264 HW acceleration.
3  *
4  * copyright (c) 2011 Sebastien Zwickert
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #include <CoreFoundation/CFDictionary.h>
24 #include <CoreFoundation/CFNumber.h>
25 #include <CoreFoundation/CFData.h>
26
27 #include "vda.h"
28 #include "libavutil/avutil.h"
29 #include "h264.h"
30
31 struct vda_buffer {
32     CVPixelBufferRef cv_buffer;
33 };
34
35 /* Decoder callback that adds the vda frame to the queue in display order. */
36 static void vda_decoder_callback(void *vda_hw_ctx,
37                                  CFDictionaryRef user_info,
38                                  OSStatus status,
39                                  uint32_t infoFlags,
40                                  CVImageBufferRef image_buffer)
41 {
42     struct vda_context *vda_ctx = vda_hw_ctx;
43
44     if (!image_buffer)
45         return;
46
47     if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
48         return;
49
50     vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
51 }
52
53 static int vda_sync_decode(struct vda_context *vda_ctx)
54 {
55     OSStatus status;
56     CFDataRef coded_frame;
57     uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
58
59     coded_frame = CFDataCreate(kCFAllocatorDefault,
60                                vda_ctx->priv_bitstream,
61                                vda_ctx->priv_bitstream_size);
62
63     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
64
65     if (kVDADecoderNoErr == status)
66         status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
67
68     CFRelease(coded_frame);
69
70     return status;
71 }
72
73
74 static int vda_h264_start_frame(AVCodecContext *avctx,
75                                 av_unused const uint8_t *buffer,
76                                 av_unused uint32_t size)
77 {
78     struct vda_context *vda_ctx = avctx->hwaccel_context;
79
80     if (!vda_ctx->decoder)
81         return -1;
82
83     vda_ctx->priv_bitstream_size = 0;
84
85     return 0;
86 }
87
88 static int vda_h264_decode_slice(AVCodecContext *avctx,
89                                  const uint8_t *buffer,
90                                  uint32_t size)
91 {
92     struct vda_context *vda_ctx = avctx->hwaccel_context;
93     void *tmp;
94
95     if (!vda_ctx->decoder)
96         return -1;
97
98     tmp = av_fast_realloc(vda_ctx->priv_bitstream,
99                           &vda_ctx->priv_allocated_size,
100                           vda_ctx->priv_bitstream_size + size + 4);
101     if (!tmp)
102         return AVERROR(ENOMEM);
103
104     vda_ctx->priv_bitstream = tmp;
105
106     AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
107     memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
108
109     vda_ctx->priv_bitstream_size += size + 4;
110
111     return 0;
112 }
113
114 static void vda_h264_release_buffer(void *opaque, uint8_t *data)
115 {
116     struct vda_buffer *context = opaque;
117     CVPixelBufferRelease(context->cv_buffer);
118     av_free(context);
119 }
120
121 static int vda_h264_end_frame(AVCodecContext *avctx)
122 {
123     H264Context *h                      = avctx->priv_data;
124     struct vda_context *vda_ctx         = avctx->hwaccel_context;
125     AVFrame *frame                      = &h->cur_pic_ptr->f;
126     struct vda_buffer *context;
127     AVBufferRef *buffer;
128     int status;
129
130     if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
131         return -1;
132
133     status = vda_sync_decode(vda_ctx);
134     frame->data[3] = (void*)vda_ctx->cv_buffer;
135
136     if (status)
137         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
138
139     if (!vda_ctx->use_ref_buffer || status)
140         return status;
141
142     context = av_mallocz(sizeof(*context));
143     buffer = av_buffer_create(NULL, 0, vda_h264_release_buffer, context, 0);
144     if (!context || !buffer) {
145         CVPixelBufferRelease(vda_ctx->cv_buffer);
146         av_free(context);
147         return -1;
148     }
149
150     context->cv_buffer = vda_ctx->cv_buffer;
151     frame->buf[3] = buffer;
152
153     return status;
154 }
155
156 int ff_vda_create_decoder(struct vda_context *vda_ctx,
157                           uint8_t *extradata,
158                           int extradata_size)
159 {
160     OSStatus status;
161     CFNumberRef height;
162     CFNumberRef width;
163     CFNumberRef format;
164     CFDataRef avc_data;
165     CFMutableDictionaryRef config_info;
166     CFMutableDictionaryRef buffer_attributes;
167     CFMutableDictionaryRef io_surface_properties;
168     CFNumberRef cv_pix_fmt;
169
170     vda_ctx->priv_bitstream = NULL;
171     vda_ctx->priv_allocated_size = 0;
172
173     /* Each VCL NAL in the bitstream sent to the decoder
174      * is preceded by a 4 bytes length header.
175      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
176     if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
177         uint8_t *rw_extradata;
178
179         if (!(rw_extradata = av_malloc(extradata_size)))
180             return AVERROR(ENOMEM);
181
182         memcpy(rw_extradata, extradata, extradata_size);
183
184         rw_extradata[4] |= 0x03;
185
186         avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
187
188         av_freep(&rw_extradata);
189     } else {
190         avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
191     }
192
193     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
194                                             4,
195                                             &kCFTypeDictionaryKeyCallBacks,
196                                             &kCFTypeDictionaryValueCallBacks);
197
198     height   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
199     width    = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
200     format   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
201
202     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
203     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
204     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
205     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
206
207     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
208                                                   2,
209                                                   &kCFTypeDictionaryKeyCallBacks,
210                                                   &kCFTypeDictionaryValueCallBacks);
211     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
212                                                       0,
213                                                       &kCFTypeDictionaryKeyCallBacks,
214                                                       &kCFTypeDictionaryValueCallBacks);
215     cv_pix_fmt  = CFNumberCreate(kCFAllocatorDefault,
216                                  kCFNumberSInt32Type,
217                                  &vda_ctx->cv_pix_fmt_type);
218     CFDictionarySetValue(buffer_attributes,
219                          kCVPixelBufferPixelFormatTypeKey,
220                          cv_pix_fmt);
221     CFDictionarySetValue(buffer_attributes,
222                          kCVPixelBufferIOSurfacePropertiesKey,
223                          io_surface_properties);
224
225     status = VDADecoderCreate(config_info,
226                               buffer_attributes,
227                               vda_decoder_callback,
228                               vda_ctx,
229                               &vda_ctx->decoder);
230
231     CFRelease(height);
232     CFRelease(width);
233     CFRelease(format);
234     CFRelease(avc_data);
235     CFRelease(config_info);
236     CFRelease(io_surface_properties);
237     CFRelease(cv_pix_fmt);
238     CFRelease(buffer_attributes);
239
240     return status;
241 }
242
243 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
244 {
245     OSStatus status = kVDADecoderNoErr;
246
247     if (vda_ctx->decoder)
248         status = VDADecoderDestroy(vda_ctx->decoder);
249
250     av_freep(&vda_ctx->priv_bitstream);
251
252     return status;
253 }
254
255 AVHWAccel ff_h264_vda_hwaccel = {
256     .name           = "h264_vda",
257     .type           = AVMEDIA_TYPE_VIDEO,
258     .id             = AV_CODEC_ID_H264,
259     .pix_fmt        = AV_PIX_FMT_VDA_VLD,
260     .start_frame    = vda_h264_start_frame,
261     .decode_slice   = vda_h264_decode_slice,
262     .end_frame      = vda_h264_end_frame,
263 };