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libavfilter/vsrc_buffer.c

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00001 /*
00002  * Copyright (c) 2008 Vitor Sessak
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00026 #include "avfilter.h"
00027 #include "avcodec.h"
00028 #include "vsrc_buffer.h"
00029 #include "libavutil/imgutils.h"
00030 
00031 typedef struct {
00032     AVFilterBufferRef *picref;
00033     int               h, w;
00034     enum PixelFormat  pix_fmt;
00035     AVRational        time_base;     
00036     AVRational        sample_aspect_ratio;
00037     char              sws_param[256];
00038 } BufferSourceContext;
00039 
00040 int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter,
00041                                         AVFilterBufferRef *picref, int flags)
00042 {
00043     BufferSourceContext *c = buffer_filter->priv;
00044     AVFilterLink *outlink = buffer_filter->outputs[0];
00045     int ret;
00046 
00047     if (c->picref) {
00048         if (flags & AV_VSRC_BUF_FLAG_OVERWRITE) {
00049             avfilter_unref_buffer(c->picref);
00050             c->picref = NULL;
00051         } else {
00052             av_log(buffer_filter, AV_LOG_ERROR,
00053                    "Buffering several frames is not supported. "
00054                    "Please consume all available frames before adding a new one.\n");
00055             return AVERROR(EINVAL);
00056         }
00057     }
00058 
00059     if (picref->video->w != c->w || picref->video->h != c->h || picref->format != c->pix_fmt) {
00060         AVFilterContext *scale = buffer_filter->outputs[0]->dst;
00061         AVFilterLink *link;
00062         char scale_param[1024];
00063 
00064         av_log(buffer_filter, AV_LOG_INFO,
00065                "Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
00066                c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
00067                picref->video->w, picref->video->h, av_pix_fmt_descriptors[picref->format].name);
00068 
00069         if (!scale || strcmp(scale->filter->name, "scale")) {
00070             AVFilter *f = avfilter_get_by_name("scale");
00071 
00072             av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
00073             if ((ret = avfilter_open(&scale, f, "Input equalizer")) < 0)
00074                 return ret;
00075 
00076             snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s", c->w, c->h, c->sws_param);
00077             if ((ret = avfilter_init_filter(scale, scale_param, NULL)) < 0) {
00078                 avfilter_free(scale);
00079                 return ret;
00080             }
00081 
00082             if ((ret = avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0)) < 0) {
00083                 avfilter_free(scale);
00084                 return ret;
00085             }
00086             scale->outputs[0]->time_base = scale->inputs[0]->time_base;
00087 
00088             scale->outputs[0]->format= c->pix_fmt;
00089         } else if (!strcmp(scale->filter->name, "scale")) {
00090             snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s",
00091                      scale->outputs[0]->w, scale->outputs[0]->h, c->sws_param);
00092             scale->filter->init(scale, scale_param, NULL);
00093         }
00094 
00095         c->pix_fmt = scale->inputs[0]->format = picref->format;
00096         c->w       = scale->inputs[0]->w      = picref->video->w;
00097         c->h       = scale->inputs[0]->h      = picref->video->h;
00098 
00099         link = scale->outputs[0];
00100         if ((ret =  link->srcpad->config_props(link)) < 0)
00101             return ret;
00102     }
00103 
00104     c->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
00105                                           picref->video->w, picref->video->h);
00106     av_image_copy(c->picref->data, c->picref->linesize,
00107                   picref->data, picref->linesize,
00108                   picref->format, picref->video->w, picref->video->h);
00109     avfilter_copy_buffer_ref_props(c->picref, picref);
00110 
00111     return 0;
00112 }
00113 
00114 #if CONFIG_AVCODEC
00115 #include "avcodec.h"
00116 
00117 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_src,
00118                              const AVFrame *frame, int flags)
00119 {
00120     int ret;
00121     AVFilterBufferRef *picref =
00122         avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
00123     if (!picref)
00124         return AVERROR(ENOMEM);
00125     ret = av_vsrc_buffer_add_video_buffer_ref(buffer_src, picref, flags);
00126     picref->buf->data[0] = NULL;
00127     avfilter_unref_buffer(picref);
00128 
00129     return ret;
00130 }
00131 #endif
00132 
00133 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00134 {
00135     BufferSourceContext *c = ctx->priv;
00136     char pix_fmt_str[128];
00137     int n = 0;
00138     *c->sws_param = 0;
00139 
00140     if (!args ||
00141         (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
00142                     &c->time_base.num, &c->time_base.den,
00143                     &c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den, c->sws_param)) < 7) {
00144         av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
00145         return AVERROR(EINVAL);
00146     }
00147 
00148     if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
00149         char *tail;
00150         c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
00151         if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
00152             av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
00153             return AVERROR(EINVAL);
00154         }
00155     }
00156 
00157     av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",
00158            c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
00159            c->time_base.num, c->time_base.den,
00160            c->sample_aspect_ratio.num, c->sample_aspect_ratio.den, c->sws_param);
00161     return 0;
00162 }
00163 
00164 static int query_formats(AVFilterContext *ctx)
00165 {
00166     BufferSourceContext *c = ctx->priv;
00167     enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
00168 
00169     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00170     return 0;
00171 }
00172 
00173 static int config_props(AVFilterLink *link)
00174 {
00175     BufferSourceContext *c = link->src->priv;
00176 
00177     link->w = c->w;
00178     link->h = c->h;
00179     link->sample_aspect_ratio = c->sample_aspect_ratio;
00180     link->time_base = c->time_base;
00181 
00182     return 0;
00183 }
00184 
00185 static int request_frame(AVFilterLink *link)
00186 {
00187     BufferSourceContext *c = link->src->priv;
00188 
00189     if (!c->picref) {
00190         av_log(link->src, AV_LOG_WARNING,
00191                "request_frame() called with no available frame!\n");
00192         return AVERROR(EINVAL);
00193     }
00194 
00195     avfilter_start_frame(link, avfilter_ref_buffer(c->picref, ~0));
00196     avfilter_draw_slice(link, 0, link->h, 1);
00197     avfilter_end_frame(link);
00198     avfilter_unref_buffer(c->picref);
00199     c->picref = NULL;
00200 
00201     return 0;
00202 }
00203 
00204 static int poll_frame(AVFilterLink *link)
00205 {
00206     BufferSourceContext *c = link->src->priv;
00207     return !!(c->picref);
00208 }
00209 
00210 AVFilter avfilter_vsrc_buffer = {
00211     .name      = "buffer",
00212     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
00213     .priv_size = sizeof(BufferSourceContext),
00214     .query_formats = query_formats,
00215 
00216     .init      = init,
00217 
00218     .inputs    = (AVFilterPad[]) {{ .name = NULL }},
00219     .outputs   = (AVFilterPad[]) {{ .name            = "default",
00220                                     .type            = AVMEDIA_TYPE_VIDEO,
00221                                     .request_frame   = request_frame,
00222                                     .poll_frame      = poll_frame,
00223                                     .config_props    = config_props, },
00224                                   { .name = NULL}},
00225 };

Generated on Fri Feb 22 2013 07:24:31 for FFmpeg by  doxygen 1.7.1