vda: use hwaccel private data for internal bitstream buffer
[ffmpeg.git] / libavcodec / vda_h264.c
1 /*
2  * VDA H.264 hardware acceleration
3  *
4  * copyright (c) 2011 Sebastien Zwickert
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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/CFNumber.h>
24 #include <CoreFoundation/CFData.h>
25 #include <CoreFoundation/CFString.h>
26
27 #include "libavutil/avutil.h"
28 #include "h264.h"
29 #include "vda.h"
30
31 typedef struct VDAContext {
32     // The current bitstream buffer.
33     uint8_t             *bitstream;
34
35     // The current size of the bitstream.
36     int                  bitstream_size;
37
38     // The reference size used for fast reallocation.
39     int                  allocated_size;
40 } VDAContext;
41
42 /* Decoder callback that adds the VDA frame to the queue in display order. */
43 static void vda_decoder_callback(void *vda_hw_ctx,
44                                  CFDictionaryRef user_info,
45                                  OSStatus status,
46                                  uint32_t infoFlags,
47                                  CVImageBufferRef image_buffer)
48 {
49     struct vda_context *vda_ctx = vda_hw_ctx;
50
51     if (!image_buffer)
52         return;
53
54     if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
55         return;
56
57     vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
58 }
59
60 static int vda_sync_decode(VDAContext *ctx, struct vda_context *vda_ctx)
61 {
62     OSStatus status;
63     CFDataRef coded_frame;
64     uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
65
66     coded_frame = CFDataCreate(kCFAllocatorDefault,
67                                ctx->bitstream,
68                                ctx->bitstream_size);
69
70     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
71
72     if (kVDADecoderNoErr == status)
73         status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
74
75     CFRelease(coded_frame);
76
77     return status;
78 }
79
80
81 static int vda_h264_start_frame(AVCodecContext *avctx,
82                                 av_unused const uint8_t *buffer,
83                                 av_unused uint32_t size)
84 {
85     VDAContext *vda = avctx->internal->hwaccel_priv_data;
86     struct vda_context *vda_ctx         = avctx->hwaccel_context;
87
88     if (!vda_ctx->decoder)
89         return -1;
90
91     vda->bitstream_size = 0;
92
93     return 0;
94 }
95
96 static int vda_h264_decode_slice(AVCodecContext *avctx,
97                                  const uint8_t *buffer,
98                                  uint32_t size)
99 {
100     VDAContext *vda                     = avctx->internal->hwaccel_priv_data;
101     struct vda_context *vda_ctx         = avctx->hwaccel_context;
102     void *tmp;
103
104     if (!vda_ctx->decoder)
105         return -1;
106
107     tmp = av_fast_realloc(vda->bitstream,
108                           &vda->allocated_size,
109                           vda->bitstream_size + size + 4);
110     if (!tmp)
111         return AVERROR(ENOMEM);
112
113     vda->bitstream = tmp;
114
115     AV_WB32(vda->bitstream + vda->bitstream_size, size);
116     memcpy(vda->bitstream + vda->bitstream_size + 4, buffer, size);
117
118     vda->bitstream_size += size + 4;
119
120     return 0;
121 }
122
123 static int vda_h264_end_frame(AVCodecContext *avctx)
124 {
125     H264Context *h                      = avctx->priv_data;
126     VDAContext *vda                     = avctx->internal->hwaccel_priv_data;
127     struct vda_context *vda_ctx         = avctx->hwaccel_context;
128     AVFrame *frame                      = &h->cur_pic_ptr->f;
129     int status;
130
131     if (!vda_ctx->decoder || !vda->bitstream)
132         return -1;
133
134     status = vda_sync_decode(vda, vda_ctx);
135     frame->data[3] = (void*)vda_ctx->cv_buffer;
136
137     if (status)
138         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
139
140     return status;
141 }
142
143 int ff_vda_create_decoder(struct vda_context *vda_ctx,
144                           uint8_t *extradata,
145                           int extradata_size)
146 {
147     OSStatus status = kVDADecoderNoErr;
148     CFNumberRef height;
149     CFNumberRef width;
150     CFNumberRef format;
151     CFDataRef avc_data;
152     CFMutableDictionaryRef config_info;
153     CFMutableDictionaryRef buffer_attributes;
154     CFMutableDictionaryRef io_surface_properties;
155     CFNumberRef cv_pix_fmt;
156
157     /* Each VCL NAL in the bistream sent to the decoder
158      * is preceded by a 4 bytes length header.
159      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
160     if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
161         uint8_t *rw_extradata;
162
163         if (!(rw_extradata = av_malloc(extradata_size)))
164             return AVERROR(ENOMEM);
165
166         memcpy(rw_extradata, extradata, extradata_size);
167
168         rw_extradata[4] |= 0x03;
169
170         avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
171
172         av_freep(&rw_extradata);
173     } else {
174         avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
175     }
176
177     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
178                                             4,
179                                             &kCFTypeDictionaryKeyCallBacks,
180                                             &kCFTypeDictionaryValueCallBacks);
181
182     height   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
183     width    = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
184     format   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
185
186     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
187     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
188     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
189     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
190
191     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
192                                                   2,
193                                                   &kCFTypeDictionaryKeyCallBacks,
194                                                   &kCFTypeDictionaryValueCallBacks);
195     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
196                                                       0,
197                                                       &kCFTypeDictionaryKeyCallBacks,
198                                                       &kCFTypeDictionaryValueCallBacks);
199     cv_pix_fmt      = CFNumberCreate(kCFAllocatorDefault,
200                                      kCFNumberSInt32Type,
201                                      &vda_ctx->cv_pix_fmt_type);
202     CFDictionarySetValue(buffer_attributes,
203                          kCVPixelBufferPixelFormatTypeKey,
204                          cv_pix_fmt);
205     CFDictionarySetValue(buffer_attributes,
206                          kCVPixelBufferIOSurfacePropertiesKey,
207                          io_surface_properties);
208
209     status = VDADecoderCreate(config_info,
210                               buffer_attributes,
211                               vda_decoder_callback,
212                               vda_ctx,
213                               &vda_ctx->decoder);
214
215     CFRelease(height);
216     CFRelease(width);
217     CFRelease(format);
218     CFRelease(avc_data);
219     CFRelease(config_info);
220     CFRelease(io_surface_properties);
221     CFRelease(cv_pix_fmt);
222     CFRelease(buffer_attributes);
223
224     return status;
225 }
226
227 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
228 {
229     OSStatus status = kVDADecoderNoErr;
230
231     if (vda_ctx->decoder)
232         status = VDADecoderDestroy(vda_ctx->decoder);
233
234     return status;
235 }
236
237 static void vda_h264_uninit(AVCodecContext *avctx)
238 {
239     VDAContext *vda = avctx->internal->priv_data;
240     av_freep(&vda->bitstream);
241 }
242
243 AVHWAccel ff_h264_vda_hwaccel = {
244     .name           = "h264_vda",
245     .type           = AVMEDIA_TYPE_VIDEO,
246     .id             = AV_CODEC_ID_H264,
247     .pix_fmt        = AV_PIX_FMT_VDA_VLD,
248     .start_frame    = vda_h264_start_frame,
249     .decode_slice   = vda_h264_decode_slice,
250     .end_frame      = vda_h264_end_frame,
251     .uninit         = vda_h264_uninit,
252     .priv_data_size = sizeof(VDAContext),
253 };