libavfilter/defaults.c - third_party/ffmpeg - Git at Google

 /*
  * 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/avassert.h"
 #include "libavutil/audioconvert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/samplefmt.h"
 #include "avfilter.h"
 #include "internal.h"

 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];
     int i;
     AVFilterBufferRef *picref = NULL;
     AVFilterPool *pool = link->pool;

     if (pool) {
         for (i = 0; i < POOL_SIZE; i++) {
             picref = pool->pic[i];
             if (picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h) {
                 AVFilterBuffer *pic = picref->buf;
                 pool->pic[i] = NULL;
                 pool->count--;
                 picref->video->w = w;
                 picref->video->h = h;
                 picref->perms = perms | AV_PERM_READ;
                 picref->format = link->format;
                 pic->refcount = 1;
                 memcpy(picref->data,     pic->data,     sizeof(picref->data));
                 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
                 pool->refcount++;
                 return picref;
             }
         }
     } else {
         pool = link->pool = av_mallocz(sizeof(AVFilterPool));
         pool->refcount = 1;
     }

     // align: +2 is needed for swscaler, +16 to be SIMD-friendly
     if ((i = av_image_alloc(data, linesize, w, h, link->format, 32)) < 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;
     }
     memset(data[0], 128, i);

     picref->buf->priv = pool;
     picref->buf->free = NULL;
     pool->refcount++;

     return picref;
 }

 AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
                                                      int nb_samples)
 {
     AVFilterBufferRef *samplesref = NULL;
     int linesize[8] = {0};
     uint8_t *data[8] = {0};
     int ch, nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);

     /* right now we don't support more than 8 channels */
     av_assert0(nb_channels <= 8);

     /* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
     if (av_samples_alloc(data, linesize,
                          nb_channels, nb_samples,
                          av_get_alt_sample_fmt(link->format, link->planar),
                          16) < 0)
         return NULL;

     for (ch = 1; link->planar && ch < nb_channels; ch++)
         linesize[ch] = linesize[0];
     samplesref =
         avfilter_get_audio_buffer_ref_from_arrays(data, linesize, perms,
                                                   nb_samples, link->format,
                                                   link->channel_layout, link->planar);
     if (!samplesref) {
         av_free(data[0]);
         return NULL;
     }

     return samplesref;
 }

 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->audio->nb_samples);
         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;
 }

 static void set_common_formats(AVFilterContext *ctx, AVFilterFormats *fmts,
                                enum AVMediaType type, int offin, int offout)
 {
     int i;
     for (i = 0; i < ctx->input_count; i++)
         if (ctx->inputs[i] && ctx->inputs[i]->type == type)
             avfilter_formats_ref(fmts,
                                  (AVFilterFormats **)((uint8_t *)ctx->inputs[i]+offout));

     for (i = 0; i < ctx->output_count; i++)
         if (ctx->outputs[i] && ctx->outputs[i]->type == type)
             avfilter_formats_ref(fmts,
                                  (AVFilterFormats **)((uint8_t *)ctx->outputs[i]+offin));

     if (!fmts->refcount) {
         av_free(fmts->formats);
         av_free(fmts->refs);
         av_free(fmts);
     }
 }

 void avfilter_set_common_pixel_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 {
     set_common_formats(ctx, formats, AVMEDIA_TYPE_VIDEO,
                        offsetof(AVFilterLink, in_formats),
                        offsetof(AVFilterLink, out_formats));
 }

 void avfilter_set_common_sample_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 {
     set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
                        offsetof(AVFilterLink, in_formats),
                        offsetof(AVFilterLink, out_formats));
 }

 void avfilter_set_common_channel_layouts(AVFilterContext *ctx, AVFilterFormats *formats)
 {
     set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
                        offsetof(AVFilterLink, in_chlayouts),
                        offsetof(AVFilterLink, out_chlayouts));
 }

 void avfilter_set_common_packing_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 {
     set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
                        offsetof(AVFilterLink, in_packing),
                        offsetof(AVFilterLink, out_packing));
 }

 int avfilter_default_query_formats(AVFilterContext *ctx)
 {
     avfilter_set_common_pixel_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_VIDEO));
     avfilter_set_common_sample_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO));
     avfilter_set_common_channel_layouts(ctx, avfilter_make_all_channel_layouts());
     avfilter_set_common_packing_formats(ctx, avfilter_make_all_packing_formats());

     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,
                                                   int nb_samples)
 {
     return avfilter_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
 }
	/*
	* 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/avassert.h"
	#include "libavutil/audioconvert.h"
	#include "libavutil/imgutils.h"
	#include "libavutil/samplefmt.h"
	#include "avfilter.h"
	#include "internal.h"

	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];
	int i;
	AVFilterBufferRef *picref = NULL;
	AVFilterPool *pool = link->pool;

	if (pool) {
	for (i = 0; i < POOL_SIZE; i++) {
	picref = pool->pic[i];
	if (picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h) {
	AVFilterBuffer *pic = picref->buf;
	pool->pic[i] = NULL;
	pool->count--;
	picref->video->w = w;
	picref->video->h = h;
	picref->perms = perms \| AV_PERM_READ;
	picref->format = link->format;
	pic->refcount = 1;
	memcpy(picref->data, pic->data, sizeof(picref->data));
	memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
	pool->refcount++;
	return picref;
	}
	}
	} else {
	pool = link->pool = av_mallocz(sizeof(AVFilterPool));
	pool->refcount = 1;
	}

	// align: +2 is needed for swscaler, +16 to be SIMD-friendly
	if ((i = av_image_alloc(data, linesize, w, h, link->format, 32)) < 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;
	}
	memset(data[0], 128, i);

	picref->buf->priv = pool;
	picref->buf->free = NULL;
	pool->refcount++;

	return picref;
	}

	AVFilterBufferRef avfilter_default_get_audio_buffer(AVFilterLink link, int perms,
	int nb_samples)
	{
	AVFilterBufferRef *samplesref = NULL;
	int linesize[8] = {0};
	uint8_t *data[8] = {0};
	int ch, nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);

	/* right now we don't support more than 8 channels */
	av_assert0(nb_channels <= 8);

	/* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
	if (av_samples_alloc(data, linesize,
	nb_channels, nb_samples,
	av_get_alt_sample_fmt(link->format, link->planar),
	16) < 0)
	return NULL;

	for (ch = 1; link->planar && ch < nb_channels; ch++)
	linesize[ch] = linesize[0];
	samplesref =
	avfilter_get_audio_buffer_ref_from_arrays(data, linesize, perms,
	nb_samples, link->format,
	link->channel_layout, link->planar);
	if (!samplesref) {
	av_free(data[0]);
	return NULL;
	}

	return samplesref;
	}

	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->audio->nb_samples);
	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;
	}

	static void set_common_formats(AVFilterContext ctx, AVFilterFormats fmts,
	enum AVMediaType type, int offin, int offout)
	{
	int i;
	for (i = 0; i < ctx->input_count; i++)
	if (ctx->inputs[i] && ctx->inputs[i]->type == type)
	avfilter_formats_ref(fmts,
	(AVFilterFormats *)((uint8_t )ctx->inputs[i]+offout));

	for (i = 0; i < ctx->output_count; i++)
	if (ctx->outputs[i] && ctx->outputs[i]->type == type)
	avfilter_formats_ref(fmts,
	(AVFilterFormats *)((uint8_t )ctx->outputs[i]+offin));

	if (!fmts->refcount) {
	av_free(fmts->formats);
	av_free(fmts->refs);
	av_free(fmts);
	}
	}

	void avfilter_set_common_pixel_formats(AVFilterContext ctx, AVFilterFormats formats)
	{
	set_common_formats(ctx, formats, AVMEDIA_TYPE_VIDEO,
	offsetof(AVFilterLink, in_formats),
	offsetof(AVFilterLink, out_formats));
	}

	void avfilter_set_common_sample_formats(AVFilterContext ctx, AVFilterFormats formats)
	{
	set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
	offsetof(AVFilterLink, in_formats),
	offsetof(AVFilterLink, out_formats));
	}

	void avfilter_set_common_channel_layouts(AVFilterContext ctx, AVFilterFormats formats)
	{
	set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
	offsetof(AVFilterLink, in_chlayouts),
	offsetof(AVFilterLink, out_chlayouts));
	}

	void avfilter_set_common_packing_formats(AVFilterContext ctx, AVFilterFormats formats)
	{
	set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
	offsetof(AVFilterLink, in_packing),
	offsetof(AVFilterLink, out_packing));
	}

	int avfilter_default_query_formats(AVFilterContext *ctx)
	{
	avfilter_set_common_pixel_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_VIDEO));
	avfilter_set_common_sample_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO));
	avfilter_set_common_channel_layouts(ctx, avfilter_make_all_channel_layouts());
	avfilter_set_common_packing_formats(ctx, avfilter_make_all_packing_formats());

	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,
	int nb_samples)
	{
	return avfilter_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
	}