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 "libavutil/channel_layout.h"
  27 #include "libavutil/common.h"
  28 #include "libavutil/fifo.h"
  29 #include "libavutil/imgutils.h"
  30 #include "libavutil/opt.h"
  31 #include "libavutil/samplefmt.h"
  32 #include "audio.h"
  33 #include "avfilter.h"
  34 #include "buffersrc.h"
  35 #include "formats.h"
  36 #include "internal.h"
  37 #include "video.h"
  38
  39 typedef struct {
  40     const AVClass    *class;
  41     AVFifoBuffer     *fifo;
  42     AVRational        time_base;     ///< time_base to set in the output link
  43
  44     /* video only */
  45     int               h, w;
  46     enum AVPixelFormat  pix_fmt;
  47     AVRational        pixel_aspect;
  48
  49     /* audio only */
  50     int sample_rate;
  51     enum AVSampleFormat sample_fmt;
  52     char               *sample_fmt_str;
  53     uint64_t channel_layout;
  54     char    *channel_layout_str;
  55
  56     int eof;
  57 } BufferSourceContext;
  58
  59 #define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
  60     if (c->w != width || c->h != height || c->pix_fmt != format) {\
  61         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
  62         return AVERROR(EINVAL);\
  63     }
  64
  65 #define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
  66     if (c->sample_fmt != format || c->sample_rate != srate ||\
  67         c->channel_layout != ch_layout) {\
  68         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
  69         return AVERROR(EINVAL);\
  70     }
  71
  72 int av_buffersrc_write_frame(AVFilterContext *buffer_filter, const AVFrame *frame)
  73 {
  74     BufferSourceContext *c = buffer_filter->priv;
  75     AVFilterBufferRef *buf;
  76     int ret;
  77
  78     if (!frame) {
  79         c->eof = 1;
  80         return 0;
  81     } else if (c->eof)
  82         return AVERROR(EINVAL);
  83
  84     if (!av_fifo_space(c->fifo) &&
  85         (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
  86                                          sizeof(buf))) < 0)
  87         return ret;
  88
  89     switch (buffer_filter->outputs[0]->type) {
  90     case AVMEDIA_TYPE_VIDEO:
  91         CHECK_VIDEO_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height,
  92                                  frame->format);
  93         buf = ff_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
  94                                   c->w, c->h);
  95         if (!buf)
  96             return AVERROR(ENOMEM);
  97
  98         av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
  99                       c->pix_fmt, c->w, c->h);
 100         break;
 101     case AVMEDIA_TYPE_AUDIO:
 102         CHECK_AUDIO_PARAM_CHANGE(buffer_filter, c, frame->sample_rate, frame->channel_layout,
 103                                  frame->format);
 104         buf = ff_get_audio_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
 105                                   frame->nb_samples);
 106         if (!buf)
 107             return AVERROR(ENOMEM);
 108
 109         av_samples_copy(buf->extended_data, frame->extended_data,
 110                         0, 0, frame->nb_samples,
 111                         av_get_channel_layout_nb_channels(frame->channel_layout),
 112                         frame->format);
 113         break;
 114     default:
 115         return AVERROR(EINVAL);
 116     }
 117
 118     avfilter_copy_frame_props(buf, frame);
 119
 120     if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
 121         avfilter_unref_buffer(buf);
 122         return ret;
 123     }
 124
 125     return 0;
 126 }
 127
 128 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
 129 {
 130     BufferSourceContext *c = s->priv;
 131     int ret;
 132
 133     if (!buf) {
 134         c->eof = 1;
 135         return 0;
 136     } else if (c->eof)
 137         return AVERROR(EINVAL);
 138
 139     if (!av_fifo_space(c->fifo) &&
 140         (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
 141                                          sizeof(buf))) < 0)
 142         return ret;
 143
 144     switch (s->outputs[0]->type) {
 145     case AVMEDIA_TYPE_VIDEO:
 146         CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
 147         break;
 148     case AVMEDIA_TYPE_AUDIO:
 149         CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
 150                                  buf->format);
 151         break;
 152     default:
 153         return AVERROR(EINVAL);
 154     }
 155
 156     if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0)
 157         return ret;
 158
 159     return 0;
 160 }
 161
 162 static av_cold int init_video(AVFilterContext *ctx, const char *args)
 163 {
 164     BufferSourceContext *c = ctx->priv;
 165     char pix_fmt_str[128];
 166     int n = 0;
 167
 168     if (!args ||
 169         (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
 170                     &c->time_base.num, &c->time_base.den,
 171                     &c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
 172         av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
 173         return AVERROR(EINVAL);
 174     }
 175     if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == AV_PIX_FMT_NONE) {
 176         char *tail;
 177         c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
 178         if (*tail || c->pix_fmt < 0 || c->pix_fmt >= AV_PIX_FMT_NB) {
 179             av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
 180             return AVERROR(EINVAL);
 181         }
 182     }
 183
 184     if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
 185         return AVERROR(ENOMEM);
 186
 187     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));
 188     return 0;
 189 }
 190
 191 #define OFFSET(x) offsetof(BufferSourceContext, x)
 192 #define A AV_OPT_FLAG_AUDIO_PARAM
 193 static const AVOption audio_options[] = {
 194     { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
 195     { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
 196     { "sample_fmt",     NULL, OFFSET(sample_fmt_str),      AV_OPT_TYPE_STRING,             .flags = A },
 197     { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
 198     { NULL },
 199 };
 200
 201 static const AVClass abuffer_class = {
 202     .class_name = "abuffer source",
 203     .item_name  = av_default_item_name,
 204     .option     = audio_options,
 205     .version    = LIBAVUTIL_VERSION_INT,
 206 };
 207
 208 static av_cold int init_audio(AVFilterContext *ctx, const char *args)
 209 {
 210     BufferSourceContext *s = ctx->priv;
 211     int ret = 0;
 212
 213     s->class = &abuffer_class;
 214     av_opt_set_defaults(s);
 215
 216     if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
 217         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: %s.\n", args);
 218         goto fail;
 219     }
 220
 221     s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
 222     if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
 223         av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
 224                s->sample_fmt_str);
 225         ret = AVERROR(EINVAL);
 226         goto fail;
 227     }
 228
 229     s->channel_layout = av_get_channel_layout(s->channel_layout_str);
 230     if (!s->channel_layout) {
 231         av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
 232                s->channel_layout_str);
 233         ret = AVERROR(EINVAL);
 234         goto fail;
 235     }
 236
 237     if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
 238         ret = AVERROR(ENOMEM);
 239         goto fail;
 240     }
 241
 242     if (!s->time_base.num)
 243         s->time_base = (AVRational){1, s->sample_rate};
 244
 245     av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
 246            "ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
 247            s->sample_rate, s->channel_layout_str);
 248
 249 fail:
 250     av_opt_free(s);
 251     return ret;
 252 }
 253
 254 static av_cold void uninit(AVFilterContext *ctx)
 255 {
 256     BufferSourceContext *s = ctx->priv;
 257     while (s->fifo && av_fifo_size(s->fifo)) {
 258         AVFilterBufferRef *buf;
 259         av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
 260         avfilter_unref_buffer(buf);
 261     }
 262     av_fifo_free(s->fifo);
 263     s->fifo = NULL;
 264 }
 265
 266 static int query_formats(AVFilterContext *ctx)
 267 {
 268     BufferSourceContext *c = ctx->priv;
 269     AVFilterChannelLayouts *channel_layouts = NULL;
 270     AVFilterFormats *formats = NULL;
 271     AVFilterFormats *samplerates = NULL;
 272
 273     switch (ctx->outputs[0]->type) {
 274     case AVMEDIA_TYPE_VIDEO:
 275         ff_add_format(&formats, c->pix_fmt);
 276         ff_set_common_formats(ctx, formats);
 277         break;
 278     case AVMEDIA_TYPE_AUDIO:
 279         ff_add_format(&formats,           c->sample_fmt);
 280         ff_set_common_formats(ctx, formats);
 281
 282         ff_add_format(&samplerates,       c->sample_rate);
 283         ff_set_common_samplerates(ctx, samplerates);
 284
 285         ff_add_channel_layout(&channel_layouts, c->channel_layout);
 286         ff_set_common_channel_layouts(ctx, channel_layouts);
 287         break;
 288     default:
 289         return AVERROR(EINVAL);
 290     }
 291
 292     return 0;
 293 }
 294
 295 static int config_props(AVFilterLink *link)
 296 {
 297     BufferSourceContext *c = link->src->priv;
 298
 299     switch (link->type) {
 300     case AVMEDIA_TYPE_VIDEO:
 301         link->w = c->w;
 302         link->h = c->h;
 303         link->sample_aspect_ratio = c->pixel_aspect;
 304         break;
 305     case AVMEDIA_TYPE_AUDIO:
 306         link->channel_layout = c->channel_layout;
 307         link->sample_rate    = c->sample_rate;
 308         break;
 309     default:
 310         return AVERROR(EINVAL);
 311     }
 312
 313     link->time_base = c->time_base;
 314     return 0;
 315 }
 316
 317 static int request_frame(AVFilterLink *link)
 318 {
 319     BufferSourceContext *c = link->src->priv;
 320     AVFilterBufferRef *buf;
 321     int ret = 0;
 322
 323     if (!av_fifo_size(c->fifo)) {
 324         if (c->eof)
 325             return AVERROR_EOF;
 326         return AVERROR(EAGAIN);
 327     }
 328     av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
 329
 330     ff_filter_frame(link, buf);
 331
 332     return ret;
 333 }
 334
 335 static int poll_frame(AVFilterLink *link)
 336 {
 337     BufferSourceContext *c = link->src->priv;
 338     int size = av_fifo_size(c->fifo);
 339     if (!size && c->eof)
 340         return AVERROR_EOF;
 341     return size/sizeof(AVFilterBufferRef*);
 342 }
 343
 344 static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {
 345     {
 346         .name          = "default",
 347         .type          = AVMEDIA_TYPE_VIDEO,
 348         .request_frame = request_frame,
 349         .poll_frame    = poll_frame,
 350         .config_props  = config_props,
 351     },
 352     { NULL }
 353 };
 354
 355 AVFilter avfilter_vsrc_buffer = {
 356     .name      = "buffer",
 357     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
 358     .priv_size = sizeof(BufferSourceContext),
 359     .query_formats = query_formats,
 360
 361     .init      = init_video,
 362     .uninit    = uninit,
 363
 364     .inputs    = NULL,
 365     .outputs   = avfilter_vsrc_buffer_outputs,
 366 };
 367
 368 static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {
 369     {
 370         .name          = "default",
 371         .type          = AVMEDIA_TYPE_AUDIO,
 372         .request_frame = request_frame,
 373         .poll_frame    = poll_frame,
 374         .config_props  = config_props,
 375     },
 376     { NULL }
 377 };
 378
 379 AVFilter avfilter_asrc_abuffer = {
 380     .name          = "abuffer",
 381     .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
 382     .priv_size     = sizeof(BufferSourceContext),
 383     .query_formats = query_formats,
 384
 385     .init      = init_audio,
 386     .uninit    = uninit,
 387
 388     .inputs    = NULL,
 389     .outputs   = avfilter_asrc_abuffer_outputs,
 390 };