summaryrefslogtreecommitdiffstats
path: root/media/ffvpx/libavcodec/get_buffer.c
blob: 647f8a3df7e5d163db928efb6cbdc4c7c8d6375b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
 * The default get_buffer2() implementation
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdint.h>

#include "libavutil/avassert.h"
#include "libavutil/avutil.h"
#include "libavutil/buffer.h"
#include "libavutil/frame.h"
#include "libavutil/hwcontext.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/samplefmt.h"
#include "libavutil/version.h"

#include "avcodec.h"
#include "internal.h"
#include "refstruct.h"

typedef struct FramePool {
    /**
     * Pools for each data plane. For audio all the planes have the same size,
     * so only pools[0] is used.
     */
    AVBufferPool *pools[4];

    /*
     * Pool parameters
     */
    int format;
    int width, height;
    int stride_align[AV_NUM_DATA_POINTERS];
    int linesize[4];
    int planes;
    int channels;
    int samples;
} FramePool;

static void frame_pool_free(FFRefStructOpaque unused, void *obj)
{
    FramePool *pool = obj;
    int i;

    for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)
        av_buffer_pool_uninit(&pool->pools[i]);
}

static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
{
    FramePool *pool = avctx->internal->pool;
    int i, ret, ch, planes;

    if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
        int planar = av_sample_fmt_is_planar(frame->format);
        ch     = frame->ch_layout.nb_channels;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
        if (!ch)
            ch = frame->channels;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
        planes = planar ? ch : 1;
    }

    if (pool && pool->format == frame->format) {
        if (avctx->codec_type == AVMEDIA_TYPE_VIDEO &&
            pool->width == frame->width && pool->height == frame->height)
            return 0;
        if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && pool->planes == planes &&
            pool->channels == ch && frame->nb_samples == pool->samples)
            return 0;
    }

    pool = ff_refstruct_alloc_ext(sizeof(*pool), 0, NULL, frame_pool_free);
    if (!pool)
        return AVERROR(ENOMEM);

    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_VIDEO: {
        int linesize[4];
        int w = frame->width;
        int h = frame->height;
        int unaligned;
        ptrdiff_t linesize1[4];
        size_t size[4];

        avcodec_align_dimensions2(avctx, &w, &h, pool->stride_align);

        do {
            // NOTE: do not align linesizes individually, this breaks e.g. assumptions
            // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
            ret = av_image_fill_linesizes(linesize, avctx->pix_fmt, w);
            if (ret < 0)
                goto fail;
            // increase alignment of w for next try (rhs gives the lowest bit set in w)
            w += w & ~(w - 1);

            unaligned = 0;
            for (i = 0; i < 4; i++)
                unaligned |= linesize[i] % pool->stride_align[i];
        } while (unaligned);

        for (i = 0; i < 4; i++)
            linesize1[i] = linesize[i];
        ret = av_image_fill_plane_sizes(size, avctx->pix_fmt, h, linesize1);
        if (ret < 0)
            goto fail;

        for (i = 0; i < 4; i++) {
            pool->linesize[i] = linesize[i];
            if (size[i]) {
                if (size[i] > INT_MAX - (16 + STRIDE_ALIGN - 1)) {
                    ret = AVERROR(EINVAL);
                    goto fail;
                }
                pool->pools[i] = av_buffer_pool_init(size[i] + 16 + STRIDE_ALIGN - 1,
                                                     CONFIG_MEMORY_POISONING ?
                                                        NULL :
                                                        av_buffer_allocz);
                if (!pool->pools[i]) {
                    ret = AVERROR(ENOMEM);
                    goto fail;
                }
            }
        }
        pool->format = frame->format;
        pool->width  = frame->width;
        pool->height = frame->height;

        break;
        }
    case AVMEDIA_TYPE_AUDIO: {
        ret = av_samples_get_buffer_size(&pool->linesize[0], ch,
                                         frame->nb_samples, frame->format, 0);
        if (ret < 0)
            goto fail;

        pool->pools[0] = av_buffer_pool_init(pool->linesize[0], NULL);
        if (!pool->pools[0]) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }

        pool->format     = frame->format;
        pool->planes     = planes;
        pool->channels   = ch;
        pool->samples = frame->nb_samples;
        break;
        }
    default: av_assert0(0);
    }

    ff_refstruct_unref(&avctx->internal->pool);
    avctx->internal->pool = pool;

    return 0;
fail:
    ff_refstruct_unref(&pool);
    return ret;
}

static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
{
    FramePool *pool = avctx->internal->pool;
    int planes = pool->planes;
    int i;

    frame->linesize[0] = pool->linesize[0];

    if (planes > AV_NUM_DATA_POINTERS) {
        frame->extended_data = av_calloc(planes, sizeof(*frame->extended_data));
        frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
        frame->extended_buf  = av_calloc(frame->nb_extended_buf,
                                          sizeof(*frame->extended_buf));
        if (!frame->extended_data || !frame->extended_buf) {
            av_freep(&frame->extended_data);
            av_freep(&frame->extended_buf);
            return AVERROR(ENOMEM);
        }
    } else {
        frame->extended_data = frame->data;
        av_assert0(frame->nb_extended_buf == 0);
    }

    for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
        frame->buf[i] = av_buffer_pool_get(pool->pools[0]);
        if (!frame->buf[i])
            goto fail;
        frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
    }
    for (i = 0; i < frame->nb_extended_buf; i++) {
        frame->extended_buf[i] = av_buffer_pool_get(pool->pools[0]);
        if (!frame->extended_buf[i])
            goto fail;
        frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
    }

    if (avctx->debug & FF_DEBUG_BUFFERS)
        av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p", frame);

    return 0;
fail:
    av_frame_unref(frame);
    return AVERROR(ENOMEM);
}

static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
{
    FramePool *pool = s->internal->pool;
    int i;

    if (pic->data[0] || pic->data[1] || pic->data[2] || pic->data[3]) {
        av_log(s, AV_LOG_ERROR, "pic->data[*]!=NULL in avcodec_default_get_buffer\n");
        return -1;
    }

    memset(pic->data, 0, sizeof(pic->data));
    pic->extended_data = pic->data;

    for (i = 0; i < 4 && pool->pools[i]; i++) {
        pic->linesize[i] = pool->linesize[i];

        pic->buf[i] = av_buffer_pool_get(pool->pools[i]);
        if (!pic->buf[i])
            goto fail;

        pic->data[i] = pic->buf[i]->data;
    }
    for (; i < AV_NUM_DATA_POINTERS; i++) {
        pic->data[i] = NULL;
        pic->linesize[i] = 0;
    }

    if (s->debug & FF_DEBUG_BUFFERS)
        av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p\n", pic);

    return 0;
fail:
    av_frame_unref(pic);
    return AVERROR(ENOMEM);
}

int avcodec_default_get_buffer2(AVCodecContext *avctx, AVFrame *frame, int flags)
{
    int ret;

    if (avctx->hw_frames_ctx) {
        ret = av_hwframe_get_buffer(avctx->hw_frames_ctx, frame, 0);
        frame->width  = avctx->coded_width;
        frame->height = avctx->coded_height;
        return ret;
    }

    if ((ret = update_frame_pool(avctx, frame)) < 0)
        return ret;

    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        return video_get_buffer(avctx, frame);
    case AVMEDIA_TYPE_AUDIO:
        return audio_get_buffer(avctx, frame);
    default:
        return -1;
    }
}