libavfilter/buffersrc.c

   1 /*
   2  * Copyright (c) 2008 Vitor Sessak
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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  * memory buffer source filter
  24  */
  25
  26 #include <float.h>
  27
  28 #include "libavutil/channel_layout.h"
  29 #include "libavutil/common.h"
  30 #include "libavutil/fifo.h"
  31 #include "libavutil/frame.h"
  32 #include "libavutil/imgutils.h"
  33 #include "libavutil/internal.h"
  34 #include "libavutil/opt.h"
  35 #include "libavutil/samplefmt.h"
  36 #include "audio.h"
  37 #include "avfilter.h"
  38 #include "buffersrc.h"
  39 #include "formats.h"
  40 #include "internal.h"
  41 #include "video.h"
  42
  43 typedef struct {
  44     const AVClass    *class;
  45     AVFifoBuffer     *fifo;
  46     AVRational        time_base;     ///< time_base to set in the output link
  47
  48     /* video only */
  49     int               h, w;
  50     enum AVPixelFormat  pix_fmt;
  51     char               *pix_fmt_str;
  52     AVRational        pixel_aspect;
  53
  54     /* audio only */
  55     int sample_rate;
  56     enum AVSampleFormat sample_fmt;
  57     char               *sample_fmt_str;
  58     uint64_t channel_layout;
  59     char    *channel_layout_str;
  60
  61     int eof;
  62 } BufferSourceContext;
  63
  64 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
  65     if (c->w != width || c->h != height || c->pix_fmt != format) {\
  66         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
  67         return AVERROR(EINVAL);\
  68     }
  69
  70 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
  71     if (c->sample_fmt != format || c->sample_rate != srate ||\
  72         c->channel_layout != ch_layout) {\
  73         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
  74         return AVERROR(EINVAL);\
  75     }
  76
  77 int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)
  78 {
  79     AVFrame *copy;
  80     int ret = 0;
  81
  82     if (!(copy = av_frame_alloc()))
  83         return AVERROR(ENOMEM);
  84     ret = av_frame_ref(copy, frame);
  85     if (ret >= 0)
  86         ret = av_buffersrc_add_frame(ctx, copy);
  87
  88     av_frame_free(&copy);
  89     return ret;
  90 }
  91
  92 int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx,
  93                                                AVFrame *frame)
  94 {
  95     BufferSourceContext *s = ctx->priv;
  96     AVFrame *copy;
  97     int refcounted, ret;
  98
  99     if (!frame) {
 100         s->eof = 1;
 101         return 0;
 102     } else if (s->eof)
 103         return AVERROR(EINVAL);
 104
 105     refcounted = !!frame->buf[0];
 106
 107     switch (ctx->outputs[0]->type) {
 108     case AVMEDIA_TYPE_VIDEO:
 109         CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,
 110                                  frame->format);
 111         break;
 112     case AVMEDIA_TYPE_AUDIO:
 113         CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,
 114                                  frame->format);
 115         break;
 116     default:
 117         return AVERROR(EINVAL);
 118     }
 119
 120     if (!av_fifo_space(s->fifo) &&
 121         (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +
 122                                          sizeof(copy))) < 0)
 123         return ret;
 124
 125     if (!(copy = av_frame_alloc()))
 126         return AVERROR(ENOMEM);
 127
 128     if (refcounted) {
 129         av_frame_move_ref(copy, frame);
 130     } else {
 131         ret = av_frame_ref(copy, frame);
 132         if (ret < 0) {
 133             av_frame_free(&copy);
 134             return ret;
 135         }
 136     }
 137
 138     if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {
 139         if (refcounted)
 140             av_frame_move_ref(frame, copy);
 141         av_frame_free(&copy);
 142         return ret;
 143     }
 144
 145     return 0;
 146 }
 147
 148 #if FF_API_AVFILTERBUFFER
 149 FF_DISABLE_DEPRECATION_WARNINGS
 150 static void compat_free_buffer(void *opaque, uint8_t *data)
 151 {
 152     AVFilterBufferRef *buf = opaque;
 153     avfilter_unref_buffer(buf);
 154 }
 155
 156 static void compat_unref_buffer(void *opaque, uint8_t *data)
 157 {
 158     AVBufferRef *buf = opaque;
 159     av_buffer_unref(&buf);
 160 }
 161
 162 int av_buffersrc_buffer(AVFilterContext *ctx, AVFilterBufferRef *buf)
 163 {
 164     BufferSourceContext *s = ctx->priv;
 165     AVFrame *frame = NULL;
 166     AVBufferRef *dummy_buf = NULL;
 167     int ret = 0, planes, i;
 168
 169     if (!buf) {
 170         s->eof = 1;
 171         return 0;
 172     } else if (s->eof)
 173         return AVERROR(EINVAL);
 174
 175     frame = av_frame_alloc();
 176     if (!frame)
 177         return AVERROR(ENOMEM);
 178
 179     dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, buf, 0);
 180     if (!dummy_buf) {
 181         ret = AVERROR(ENOMEM);
 182         goto fail;
 183     }
 184
 185     if ((ret = avfilter_copy_buf_props(frame, buf)) < 0)
 186         goto fail;
 187
 188 #define WRAP_PLANE(ref_out, data, data_size)                            \
 189 do {                                                                    \
 190     AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf);                  \
 191     if (!dummy_ref) {                                                   \
 192         ret = AVERROR(ENOMEM);                                          \
 193         goto fail;                                                      \
 194     }                                                                   \
 195     ref_out = av_buffer_create(data, data_size, compat_unref_buffer,    \
 196                                dummy_ref, 0);                           \
 197     if (!ref_out) {                                                     \
 198         av_frame_unref(frame);                                          \
 199         ret = AVERROR(ENOMEM);                                          \
 200         goto fail;                                                      \
 201     }                                                                   \
 202 } while (0)
 203
 204     if (ctx->outputs[0]->type  == AVMEDIA_TYPE_VIDEO) {
 205         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
 206
 207         planes = av_pix_fmt_count_planes(frame->format);
 208         if (!desc || planes <= 0) {
 209             ret = AVERROR(EINVAL);
 210             goto fail;
 211         }
 212
 213         for (i = 0; i < planes; i++) {
 214             int v_shift    = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
 215             int plane_size = (frame->height >> v_shift) * frame->linesize[i];
 216
 217             WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
 218         }
 219     } else {
 220         int planar = av_sample_fmt_is_planar(frame->format);
 221         int channels = av_get_channel_layout_nb_channels(frame->channel_layout);
 222
 223         planes = planar ? channels : 1;
 224
 225         if (planes > FF_ARRAY_ELEMS(frame->buf)) {
 226             frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
 227             frame->extended_buf = av_mallocz(sizeof(*frame->extended_buf) *
 228                                              frame->nb_extended_buf);
 229             if (!frame->extended_buf) {
 230                 ret = AVERROR(ENOMEM);
 231                 goto fail;
 232             }
 233         }
 234
 235         for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
 236             WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);
 237
 238         for (i = 0; i < planes - FF_ARRAY_ELEMS(frame->buf); i++)
 239             WRAP_PLANE(frame->extended_buf[i],
 240                        frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
 241                        frame->linesize[0]);
 242     }
 243
 244     ret = av_buffersrc_add_frame(ctx, frame);
 245
 246 fail:
 247     av_buffer_unref(&dummy_buf);
 248     av_frame_free(&frame);
 249
 250     return ret;
 251 }
 252 FF_ENABLE_DEPRECATION_WARNINGS
 253 #endif
 254
 255 static av_cold int init_video(AVFilterContext *ctx)
 256 {
 257     BufferSourceContext *c = ctx->priv;
 258
 259     if (!c->pix_fmt_str || !c->w || !c->h || av_q2d(c->time_base) <= 0) {
 260         av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
 261         return AVERROR(EINVAL);
 262     }
 263
 264     if ((c->pix_fmt = av_get_pix_fmt(c->pix_fmt_str)) == AV_PIX_FMT_NONE) {
 265         char *tail;
 266         c->pix_fmt = strtol(c->pix_fmt_str, &tail, 10);
 267         if (*tail || c->pix_fmt < 0 || c->pix_fmt >= AV_PIX_FMT_NB) {
 268             av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", c->pix_fmt_str);
 269             return AVERROR(EINVAL);
 270         }
 271     }
 272
 273     if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))
 274         return AVERROR(ENOMEM);
 275
 276     av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_get_pix_fmt_name(c->pix_fmt));
 277     return 0;
 278 }
 279
 280 #define OFFSET(x) offsetof(BufferSourceContext, x)
 281 #define A AV_OPT_FLAG_AUDIO_PARAM
 282 #define V AV_OPT_FLAG_VIDEO_PARAM
 283
 284 static const AVOption video_options[] = {
 285     { "width",         NULL,                     OFFSET(w),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
 286     { "height",        NULL,                     OFFSET(h),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
 287     { "pix_fmt",       NULL,                     OFFSET(pix_fmt_str),      AV_OPT_TYPE_STRING,                    .flags = V },
 288 #if FF_API_OLD_FILTER_OPTS
 289     /* those 4 are for compatibility with the old option passing system where each filter
 290      * did its own parsing */
 291     { "time_base_num", "deprecated, do not use", OFFSET(time_base.num),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
 292     { "time_base_den", "deprecated, do not use", OFFSET(time_base.den),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
 293     { "sar_num",       "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
 294     { "sar_den",       "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
 295 #endif
 296     { "sar",           "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
 297     { "time_base",     NULL,                     OFFSET(time_base),        AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
 298     { NULL },
 299 };
 300
 301 static const AVClass buffer_class = {
 302     .class_name = "buffer source",
 303     .item_name  = av_default_item_name,
 304     .option     = video_options,
 305     .version    = LIBAVUTIL_VERSION_INT,
 306 };
 307
 308 static const AVOption audio_options[] = {
 309     { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
 310     { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
 311     { "sample_fmt",     NULL, OFFSET(sample_fmt_str),      AV_OPT_TYPE_STRING,             .flags = A },
 312     { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
 313     { NULL },
 314 };
 315
 316 static const AVClass abuffer_class = {
 317     .class_name = "abuffer source",
 318     .item_name  = av_default_item_name,
 319     .option     = audio_options,
 320     .version    = LIBAVUTIL_VERSION_INT,
 321 };
 322
 323 static av_cold int init_audio(AVFilterContext *ctx)
 324 {
 325     BufferSourceContext *s = ctx->priv;
 326     int ret = 0;
 327
 328     s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
 329     if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
 330         av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
 331                s->sample_fmt_str);
 332         return AVERROR(EINVAL);
 333     }
 334
 335     s->channel_layout = av_get_channel_layout(s->channel_layout_str);
 336     if (!s->channel_layout) {
 337         av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
 338                s->channel_layout_str);
 339         return AVERROR(EINVAL);
 340     }
 341
 342     if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))
 343         return AVERROR(ENOMEM);
 344
 345     if (!s->time_base.num)
 346         s->time_base = (AVRational){1, s->sample_rate};
 347
 348     av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
 349            "ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
 350            s->sample_rate, s->channel_layout_str);
 351
 352     return ret;
 353 }
 354
 355 static av_cold void uninit(AVFilterContext *ctx)
 356 {
 357     BufferSourceContext *s = ctx->priv;
 358     while (s->fifo && av_fifo_size(s->fifo)) {
 359         AVFrame *frame;
 360         av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);
 361         av_frame_free(&frame);
 362     }
 363     av_fifo_free(s->fifo);
 364     s->fifo = NULL;
 365 }
 366
 367 static int query_formats(AVFilterContext *ctx)
 368 {
 369     BufferSourceContext *c = ctx->priv;
 370     AVFilterChannelLayouts *channel_layouts = NULL;
 371     AVFilterFormats *formats = NULL;
 372     AVFilterFormats *samplerates = NULL;
 373
 374     switch (ctx->outputs[0]->type) {
 375     case AVMEDIA_TYPE_VIDEO:
 376         ff_add_format(&formats, c->pix_fmt);
 377         ff_set_common_formats(ctx, formats);
 378         break;
 379     case AVMEDIA_TYPE_AUDIO:
 380         ff_add_format(&formats,           c->sample_fmt);
 381         ff_set_common_formats(ctx, formats);
 382
 383         ff_add_format(&samplerates,       c->sample_rate);
 384         ff_set_common_samplerates(ctx, samplerates);
 385
 386         ff_add_channel_layout(&channel_layouts, c->channel_layout);
 387         ff_set_common_channel_layouts(ctx, channel_layouts);
 388         break;
 389     default:
 390         return AVERROR(EINVAL);
 391     }
 392
 393     return 0;
 394 }
 395
 396 static int config_props(AVFilterLink *link)
 397 {
 398     BufferSourceContext *c = link->src->priv;
 399
 400     switch (link->type) {
 401     case AVMEDIA_TYPE_VIDEO:
 402         link->w = c->w;
 403         link->h = c->h;
 404         link->sample_aspect_ratio = c->pixel_aspect;
 405         break;
 406     case AVMEDIA_TYPE_AUDIO:
 407         link->channel_layout = c->channel_layout;
 408         link->sample_rate    = c->sample_rate;
 409         break;
 410     default:
 411         return AVERROR(EINVAL);
 412     }
 413
 414     link->time_base = c->time_base;
 415     return 0;
 416 }
 417
 418 static int request_frame(AVFilterLink *link)
 419 {
 420     BufferSourceContext *c = link->src->priv;
 421     AVFrame *frame;
 422     int ret = 0;
 423
 424     if (!av_fifo_size(c->fifo)) {
 425         if (c->eof)
 426             return AVERROR_EOF;
 427         return AVERROR(EAGAIN);
 428     }
 429     av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);
 430
 431     ff_filter_frame(link, frame);
 432
 433     return ret;
 434 }
 435
 436 static int poll_frame(AVFilterLink *link)
 437 {
 438     BufferSourceContext *c = link->src->priv;
 439     int size = av_fifo_size(c->fifo);
 440     if (!size && c->eof)
 441         return AVERROR_EOF;
 442     return size/sizeof(AVFrame*);
 443 }
 444
 445 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
 446     {
 447         .name          = "default",
 448         .type          = AVMEDIA_TYPE_VIDEO,
 449         .request_frame = request_frame,
 450         .poll_frame    = poll_frame,
 451         .config_props  = config_props,
 452     },
 453     { NULL }
 454 };
 455
 456 AVFilter ff_vsrc_buffer = {
 457     .name      = "buffer",
 458     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
 459     .priv_size = sizeof(BufferSourceContext),
 460     .priv_class = &buffer_class,
 461     .query_formats = query_formats,
 462
 463     .init      = init_video,
 464     .uninit    = uninit,
 465
 466     .inputs    = NULL,
 467     .outputs   = avfilter_vsrc_buffer_outputs,
 468 };
 469
 470 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
 471     {
 472         .name          = "default",
 473         .type          = AVMEDIA_TYPE_AUDIO,
 474         .request_frame = request_frame,
 475         .poll_frame    = poll_frame,
 476         .config_props  = config_props,
 477     },
 478     { NULL }
 479 };
 480
 481 AVFilter ff_asrc_abuffer = {
 482     .name          = "abuffer",
 483     .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
 484     .priv_size     = sizeof(BufferSourceContext),
 485     .priv_class    = &abuffer_class,
 486     .query_formats = query_formats,
 487
 488     .init      = init_audio,
 489     .uninit    = uninit,
 490
 491     .inputs    = NULL,
 492     .outputs   = avfilter_asrc_abuffer_outputs,
 493 };