libavfilter/f_interleave.c

   1 /*
   2  * Copyright (c) 2013 Stefano Sabatini
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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  * audio and video interleaver
  24  */
  25
  26 #include "config_components.h"
  27
  28 #include "libavutil/avassert.h"
  29 #include "libavutil/avstring.h"
  30 #include "libavutil/opt.h"
  31
  32 #include "avfilter.h"
  33 #include "filters.h"
  34 #include "audio.h"
  35 #include "video.h"
  36
  37 typedef struct InterleaveContext {
  38     const AVClass *class;
  39     int nb_inputs;
  40     int duration_mode;
  41     int64_t pts;
  42 } InterleaveContext;
  43
  44 #define DURATION_LONGEST  0
  45 #define DURATION_SHORTEST 1
  46 #define DURATION_FIRST    2
  47
  48 #define OFFSET(x) offsetof(InterleaveContext, x)
  49
  50 #define DEFINE_OPTIONS(filt_name, flags_)                           \
  51 static const AVOption filt_name##_options[] = {                     \
  52    { "nb_inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, .flags = flags_ }, \
  53    { "n",         "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, .flags = flags_ }, \
  54    { "duration", "how to determine the end-of-stream",              \
  55        OFFSET(duration_mode), AV_OPT_TYPE_INT, { .i64 = DURATION_LONGEST }, 0,  2, flags_, .unit = "duration" }, \
  56        { "longest",  "Duration of longest input",  0, AV_OPT_TYPE_CONST, { .i64 = DURATION_LONGEST  }, 0, 0, flags_, .unit = "duration" }, \
  57        { "shortest", "Duration of shortest input", 0, AV_OPT_TYPE_CONST, { .i64 = DURATION_SHORTEST }, 0, 0, flags_, .unit = "duration" }, \
  58        { "first",    "Duration of first input",    0, AV_OPT_TYPE_CONST, { .i64 = DURATION_FIRST    }, 0, 0, flags_, .unit = "duration" }, \
  59    { NULL }                                                         \
  60 }
  61
  62 static int activate(AVFilterContext *ctx)
  63 {
  64     AVFilterLink *outlink = ctx->outputs[0];
  65     InterleaveContext *s = ctx->priv;
  66     int64_t q_pts, pts = INT64_MAX;
  67     int i, nb_eofs = 0, input_idx = -1;
  68     int first_eof = 0;
  69     int64_t rpts;
  70     int status;
  71     int nb_inputs_with_frames = 0;
  72
  73     FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
  74
  75     for (i = 0; i < ctx->nb_inputs; i++) {
  76         int is_eof = !!ff_inlink_acknowledge_status(ctx->inputs[i], &status, &rpts);
  77
  78         nb_eofs += is_eof;
  79         if (i == 0)
  80             first_eof = is_eof;
  81     }
  82
  83     if ((nb_eofs > 0 && s->duration_mode == DURATION_SHORTEST) ||
  84         (nb_eofs == ctx->nb_inputs && s->duration_mode == DURATION_LONGEST) ||
  85         (first_eof && s->duration_mode == DURATION_FIRST)) {
  86         ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
  87         return 0;
  88     }
  89
  90     for (i = 0; i < ctx->nb_inputs; i++) {
  91         if (!ff_inlink_queued_frames(ctx->inputs[i]))
  92             continue;
  93         nb_inputs_with_frames++;
  94     }
  95
  96     if (nb_inputs_with_frames >= ctx->nb_inputs - nb_eofs) {
  97         for (i = 0; i < ctx->nb_inputs; i++) {
  98             AVFrame *frame;
  99
 100             if (ff_inlink_queued_frames(ctx->inputs[i]) == 0)
 101                 continue;
 102
 103             frame = ff_inlink_peek_frame(ctx->inputs[i], 0);
 104             if (frame->pts == AV_NOPTS_VALUE) {
 105                 int ret;
 106
 107                 av_log(ctx, AV_LOG_WARNING,
 108                        "NOPTS value for input frame cannot be accepted, frame discarded\n");
 109                 ret = ff_inlink_consume_frame(ctx->inputs[i], &frame);
 110                 if (ret < 0)
 111                     return ret;
 112                 av_frame_free(&frame);
 113                 return AVERROR_INVALIDDATA;
 114             }
 115
 116             q_pts = av_rescale_q(frame->pts, ctx->inputs[i]->time_base, AV_TIME_BASE_Q);
 117             if (q_pts < pts) {
 118                 pts = q_pts;
 119                 input_idx = i;
 120             }
 121         }
 122
 123         if (input_idx >= 0) {
 124             AVFrame *frame;
 125             int ret;
 126
 127             ret = ff_inlink_consume_frame(ctx->inputs[input_idx], &frame);
 128             if (ret < 0)
 129                 return ret;
 130
 131             frame->pts = s->pts = pts;
 132             return ff_filter_frame(outlink, frame);
 133         }
 134     }
 135
 136     for (i = 0; i < ctx->nb_inputs; i++) {
 137         if (ff_inlink_queued_frames(ctx->inputs[i]))
 138             continue;
 139         if (ff_outlink_frame_wanted(outlink) &&
 140             !ff_outlink_get_status(ctx->inputs[i])) {
 141             ff_inlink_request_frame(ctx->inputs[i]);
 142             return 0;
 143         }
 144     }
 145
 146     if (i == ctx->nb_inputs - nb_eofs && ff_outlink_frame_wanted(outlink)) {
 147         ff_filter_set_ready(ctx, 100);
 148         return 0;
 149     }
 150
 151     return FFERROR_NOT_READY;
 152 }
 153
 154 static av_cold int init(AVFilterContext *ctx)
 155 {
 156     InterleaveContext *s = ctx->priv;
 157     const AVFilterPad *outpad = &ctx->filter->outputs[0];
 158     int i, ret;
 159
 160     for (i = 0; i < s->nb_inputs; i++) {
 161         AVFilterPad inpad = { 0 };
 162
 163         inpad.name = av_asprintf("input%d", i);
 164         if (!inpad.name)
 165             return AVERROR(ENOMEM);
 166         inpad.type         = outpad->type;
 167
 168         switch (outpad->type) {
 169         case AVMEDIA_TYPE_VIDEO:
 170             inpad.get_buffer.video = ff_null_get_video_buffer; break;
 171         case AVMEDIA_TYPE_AUDIO:
 172             inpad.get_buffer.audio = ff_null_get_audio_buffer; break;
 173         default:
 174             av_assert0(0);
 175         }
 176         if ((ret = ff_append_inpad_free_name(ctx, &inpad)) < 0)
 177             return ret;
 178     }
 179
 180     return 0;
 181 }
 182
 183 static int config_output(AVFilterLink *outlink)
 184 {
 185     FilterLink *l = ff_filter_link(outlink);
 186     AVFilterContext *ctx = outlink->src;
 187     AVFilterLink *inlink0 = ctx->inputs[0];
 188     int i;
 189
 190     if (outlink->type == AVMEDIA_TYPE_VIDEO) {
 191         outlink->time_base           = AV_TIME_BASE_Q;
 192         outlink->w                   = inlink0->w;
 193         outlink->h                   = inlink0->h;
 194         outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
 195         outlink->format              = inlink0->format;
 196         l->frame_rate = (AVRational) {1, 0};
 197         for (i = 1; i < ctx->nb_inputs; i++) {
 198             AVFilterLink *inlink = ctx->inputs[i];
 199
 200             if (outlink->w                       != inlink->w                       ||
 201                 outlink->h                       != inlink->h                       ||
 202                 outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num ||
 203                 outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) {
 204                 av_log(ctx, AV_LOG_ERROR, "Parameters for input link %s "
 205                        "(size %dx%d, SAR %d:%d) do not match the corresponding "
 206                        "output link parameters (%dx%d, SAR %d:%d)\n",
 207                        ctx->input_pads[i].name, inlink->w, inlink->h,
 208                        inlink->sample_aspect_ratio.num,
 209                        inlink->sample_aspect_ratio.den,
 210                        outlink->w, outlink->h,
 211                        outlink->sample_aspect_ratio.num,
 212                        outlink->sample_aspect_ratio.den);
 213                 return AVERROR(EINVAL);
 214             }
 215         }
 216     }
 217     return 0;
 218 }
 219
 220 #if CONFIG_INTERLEAVE_FILTER
 221
 222 DEFINE_OPTIONS(interleave, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
 223 AVFILTER_DEFINE_CLASS(interleave);
 224
 225 static const AVFilterPad interleave_outputs[] = {
 226     {
 227         .name          = "default",
 228         .type          = AVMEDIA_TYPE_VIDEO,
 229         .config_props  = config_output,
 230     },
 231 };
 232
 233 const FFFilter ff_vf_interleave = {
 234     .p.name        = "interleave",
 235     .p.description = NULL_IF_CONFIG_SMALL("Temporally interleave video inputs."),
 236     .p.priv_class  = &interleave_class,
 237     .p.flags       = AVFILTER_FLAG_DYNAMIC_INPUTS,
 238     .priv_size   = sizeof(InterleaveContext),
 239     .init        = init,
 240     .activate    = activate,
 241     FILTER_OUTPUTS(interleave_outputs),
 242 };
 243
 244 #endif
 245
 246 #if CONFIG_AINTERLEAVE_FILTER
 247
 248 DEFINE_OPTIONS(ainterleave, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
 249 AVFILTER_DEFINE_CLASS(ainterleave);
 250
 251 static const AVFilterPad ainterleave_outputs[] = {
 252     {
 253         .name          = "default",
 254         .type          = AVMEDIA_TYPE_AUDIO,
 255         .config_props  = config_output,
 256     },
 257 };
 258
 259 const FFFilter ff_af_ainterleave = {
 260     .p.name        = "ainterleave",
 261     .p.description = NULL_IF_CONFIG_SMALL("Temporally interleave audio inputs."),
 262     .p.priv_class  = &ainterleave_class,
 263     .p.flags       = AVFILTER_FLAG_DYNAMIC_INPUTS,
 264     .priv_size   = sizeof(InterleaveContext),
 265     .init        = init,
 266     .activate    = activate,
 267     FILTER_OUTPUTS(ainterleave_outputs),
 268 };
 269
 270 #endif