/* * Filter layer - default implementations * Copyright (c) 2007 Bobby Bingham * * 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 "libavutil/audioconvert.h"#include "libavutil/imgutils.h"#include "libavutil/samplefmt.h"#include "avfilter.h"#include "internal.h" /* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr){    av_free(ptr->data[0]);    av_free(ptr);} /* TODO: set the buffer's priv member to a context structure for the whole * filter chain.  This will allow for a buffer pool instead of the constant * alloc & free cycle currently implemented. */AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h){    int linesize[4];    uint8_t *data[4];    AVFilterBufferRef *picref = NULL;     // +2 is needed for swscaler, +16 to be SIMD-friendly    if (av_image_alloc(data, linesize, w, h, link->format, 16) < 0)        return NULL;     picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,                                                       perms, w, h, link->format);    if (!picref) {        av_free(data[0]);        return NULL;    }     return picref;} AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,                                                     enum AVSampleFormat sample_fmt, int size,                                                     int64_t channel_layout, int planar){    AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));    AVFilterBufferRef *ref = NULL;    int i, sample_size, chans_nb, bufsize, per_channel_size, step_size = 0;    char *buf;     if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))        goto fail;     ref->buf                   = samples;    ref->format                = sample_fmt;     ref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps));    if (!ref->audio)        goto fail;     ref->audio->channel_layout = channel_layout;    ref->audio->size           = size;    ref->audio->planar         = planar;     /* make sure the buffer gets read permission or it's useless for output */    ref->perms = perms | AV_PERM_READ;     samples->refcount   = 1;    samples->free       = ff_avfilter_default_free_buffer;     sample_size = av_get_bits_per_sample_fmt(sample_fmt) >>3;    chans_nb = av_get_channel_layout_nb_channels(channel_layout);     per_channel_size = size/chans_nb;    ref->audio->nb_samples = per_channel_size/sample_size;     /* Set the number of bytes to traverse to reach next sample of a particular channel:     * For planar, this is simply the sample size.     * For packed, this is the number of samples * sample_size.     */    for (i = 0; i < chans_nb; i++)        samples->linesize[i] = planar > 0 ? per_channel_size : sample_size;    memset(&samples->linesize[chans_nb], 0, (8-chans_nb) * sizeof(samples->linesize[0]));     /* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */    bufsize = (size + 15)&~15;    buf = av_malloc(bufsize);    if (!buf)        goto fail;     /* For planar, set the start point of each channel's data within the buffer     * For packed, set the start point of the entire buffer only     */    samples->data[0] = buf;    if (buf && planar) {        for (i = 1; i < chans_nb; i++) {            step_size += per_channel_size;            samples->data[i] = buf + step_size;        }    } else {        for (i = 1; i < chans_nb; i++)            samples->data[i] = buf;    }     memset(&samples->data[chans_nb], 0, (8-chans_nb) * sizeof(samples->data[0]));     memcpy(ref->data,     samples->data,     sizeof(ref->data));    memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));     return ref; fail:    if (ref)        av_free(ref->audio);    av_free(ref);    av_free(samples);    return NULL;} void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref){    AVFilterLink *outlink = NULL;     if (inlink->dst->output_count)        outlink = inlink->dst->outputs[0];     if (outlink) {        outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);        avfilter_copy_buffer_ref_props(outlink->out_buf, picref);        avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));    }} void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir){    AVFilterLink *outlink = NULL;     if (inlink->dst->output_count)        outlink = inlink->dst->outputs[0];     if (outlink)        avfilter_draw_slice(outlink, y, h, slice_dir);} void avfilter_default_end_frame(AVFilterLink *inlink){    AVFilterLink *outlink = NULL;     if (inlink->dst->output_count)        outlink = inlink->dst->outputs[0];     avfilter_unref_buffer(inlink->cur_buf);    inlink->cur_buf = NULL;     if (outlink) {        if (outlink->out_buf) {            avfilter_unref_buffer(outlink->out_buf);            outlink->out_buf = NULL;        }        avfilter_end_frame(outlink);    }} /* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref){    AVFilterLink *outlink = NULL;     if (inlink->dst->output_count)        outlink = inlink->dst->outputs[0];     if (outlink) {        outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE, samplesref->format,                                                             samplesref->audio->size,                                                             samplesref->audio->channel_layout,                                                             samplesref->audio->planar);        outlink->out_buf->pts                = samplesref->pts;        outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;        avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));        avfilter_unref_buffer(outlink->out_buf);        outlink->out_buf = NULL;    }    avfilter_unref_buffer(samplesref);    inlink->cur_buf = NULL;} /** * default config_link() implementation for output video links to simplify * the implementation of one input one output video filters */int avfilter_default_config_output_link(AVFilterLink *link){    if (link->src->input_count && link->src->inputs[0]) {        if (link->type == AVMEDIA_TYPE_VIDEO) {            link->w = link->src->inputs[0]->w;            link->h = link->src->inputs[0]->h;            link->time_base = link->src->inputs[0]->time_base;        } else if (link->type == AVMEDIA_TYPE_AUDIO) {            link->channel_layout = link->src->inputs[0]->channel_layout;            link->sample_rate    = link->src->inputs[0]->sample_rate;        }    } else {        /* XXX: any non-simple filter which would cause this branch to be taken         * really should implement its own config_props() for this link. */        return -1;    }     return 0;} /** * A helper for query_formats() which sets all links to the same list of * formats. If there are no links hooked to this filter, the list of formats is * freed. * * FIXME: this will need changed for filters with a mix of pad types * (video + audio, etc) */void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats){    int count = 0, i;     for (i = 0; i < ctx->input_count; i++) {        if (ctx->inputs[i]) {            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);            count++;        }    }    for (i = 0; i < ctx->output_count; i++) {        if (ctx->outputs[i]) {            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);            count++;        }    }     if (!count) {        av_free(formats->formats);        av_free(formats->refs);        av_free(formats);    }} int avfilter_default_query_formats(AVFilterContext *ctx){    enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :                            ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :                            AVMEDIA_TYPE_VIDEO;     avfilter_set_common_formats(ctx, avfilter_all_formats(type));    return 0;} void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref){    avfilter_start_frame(link->dst->outputs[0], picref);} void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir){    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);} void avfilter_null_end_frame(AVFilterLink *link){    avfilter_end_frame(link->dst->outputs[0]);} void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref){    avfilter_filter_samples(link->dst->outputs[0], samplesref);} AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h){    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);} AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,                                                  enum AVSampleFormat sample_fmt, int size,                                                  int64_t channel_layout, int packed){    return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,                                     size, channel_layout, packed);}