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

 /*
  * Copyright (c) 2015 Derek Buitenhuis
  *
  * 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/opt.h"
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"

 #define DEFAULT_LENGTH 300

 typedef struct ReverseContext {
     int nb_frames;
     AVFrame **frames;
     unsigned int frames_size;
     unsigned int pts_size;
     int64_t *pts;
     int flush_idx;
 } ReverseContext;

 static av_cold int init(AVFilterContext *ctx)
 {
     ReverseContext *s = ctx->priv;

     s->pts = av_fast_realloc(NULL, &s->pts_size,
                              DEFAULT_LENGTH * sizeof(*(s->pts)));
     if (!s->pts)
         return AVERROR(ENOMEM);

     s->frames = av_fast_realloc(NULL, &s->frames_size,
                                 DEFAULT_LENGTH * sizeof(*(s->frames)));
     if (!s->frames) {
         av_freep(&s->pts);
         return AVERROR(ENOMEM);
     }

     return 0;
 }

 static av_cold void uninit(AVFilterContext *ctx)
 {
     ReverseContext *s = ctx->priv;

     while (s->nb_frames > 0) {
         av_frame_free(&s->frames[s->nb_frames - 1]);
         s->nb_frames--;
     }

     av_freep(&s->pts);
     av_freep(&s->frames);
 }

 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
     AVFilterContext *ctx = inlink->dst;
     ReverseContext *s    = ctx->priv;
     void *ptr;

     if (s->nb_frames + 1 > s->pts_size / sizeof(*(s->pts))) {
         ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
         if (!ptr)
             return AVERROR(ENOMEM);
         s->pts = ptr;
     }

     if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
         ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
         if (!ptr)
             return AVERROR(ENOMEM);
         s->frames = ptr;
     }

     s->frames[s->nb_frames] = in;
     s->pts[s->nb_frames]    = in->pts;
     s->nb_frames++;

     return 0;
 }

 #if CONFIG_REVERSE_FILTER

 static int request_frame(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     ReverseContext *s = ctx->priv;
     int ret;

     ret = ff_request_frame(ctx->inputs[0]);

     if (ret == AVERROR_EOF && s->nb_frames > 0) {
         AVFrame *out = s->frames[s->nb_frames - 1];
         out->pts     = s->pts[s->flush_idx++];
         ret          = ff_filter_frame(outlink, out);
         s->frames[s->nb_frames - 1] = NULL;
         s->nb_frames--;
     }

     return ret;
 }

 static const AVFilterPad reverse_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
     },
     { NULL }
 };

 static const AVFilterPad reverse_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
         .request_frame = request_frame,
     },
     { NULL }
 };

 AVFilter ff_vf_reverse = {
     .name        = "reverse",
     .description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
     .priv_size   = sizeof(ReverseContext),
     .init        = init,
     .uninit      = uninit,
     .inputs      = reverse_inputs,
     .outputs     = reverse_outputs,
 };

 #endif /* CONFIG_REVERSE_FILTER */

 #if CONFIG_AREVERSE_FILTER

 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *formats;
     AVFilterChannelLayouts *layouts;
     int ret;

     layouts = ff_all_channel_counts();
     if (!layouts)
         return AVERROR(ENOMEM);
     ret = ff_set_common_channel_layouts(ctx, layouts);
     if (ret < 0)
         return ret;

     ret = ff_set_common_formats(ctx, ff_all_formats(AVMEDIA_TYPE_AUDIO));
     if (ret < 0)
         return ret;

     formats = ff_all_samplerates();
     if (!formats)
         return AVERROR(ENOMEM);
     return ff_set_common_samplerates(ctx, formats);
 }

 static void reverse_samples_planar(AVFrame *out)
 {
     for (int p = 0; p < out->channels; p++) {
         switch (out->format) {
         case AV_SAMPLE_FMT_U8P: {
             uint8_t *dst = (uint8_t *)out->extended_data[p];
             for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                 FFSWAP(uint8_t, dst[i], dst[j]);
         }
             break;
         case AV_SAMPLE_FMT_S16P: {
             int16_t *dst = (int16_t *)out->extended_data[p];
             for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                 FFSWAP(int16_t, dst[i], dst[j]);
         }
             break;
         case AV_SAMPLE_FMT_S32P: {
             int32_t *dst = (int32_t *)out->extended_data[p];
             for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                 FFSWAP(int32_t, dst[i], dst[j]);
         }
             break;
         case AV_SAMPLE_FMT_FLTP: {
             float *dst = (float *)out->extended_data[p];
             for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                 FFSWAP(float, dst[i], dst[j]);
         }
             break;
         case AV_SAMPLE_FMT_DBLP: {
             double *dst = (double *)out->extended_data[p];
             for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
                 FFSWAP(double, dst[i], dst[j]);
         }
             break;
         }
     }
 }

 static void reverse_samples_packed(AVFrame *out)
 {
     const int channels = out->channels;

     switch (out->format) {
     case AV_SAMPLE_FMT_U8: {
         uint8_t *dst = (uint8_t *)out->extended_data[0];
         for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
             for (int p = 0; p < channels; p++)
                 FFSWAP(uint8_t, dst[i * channels + p], dst[j * channels + p]);
     }
         break;
     case AV_SAMPLE_FMT_S16: {
         int16_t *dst = (int16_t *)out->extended_data[0];
         for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
             for (int p = 0; p < channels; p++)
                 FFSWAP(int16_t, dst[i * channels + p], dst[j * channels + p]);
     }
         break;
     case AV_SAMPLE_FMT_S32: {
         int32_t *dst = (int32_t *)out->extended_data[0];
         for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
             for (int p = 0; p < channels; p++)
                 FFSWAP(int32_t, dst[i * channels + p], dst[j * channels + p]);
     }
         break;
     case AV_SAMPLE_FMT_FLT: {
         float *dst = (float *)out->extended_data[0];
         for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
             for (int p = 0; p < channels; p++)
                 FFSWAP(float, dst[i * channels + p], dst[j * channels + p]);
     }
         break;
     case AV_SAMPLE_FMT_DBL: {
         double *dst = (double *)out->extended_data[0];
         for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
             for (int p = 0; p < channels; p++)
                 FFSWAP(double, dst[i * channels + p], dst[j * channels + p]);
     }
         break;
     }
 }

 static int areverse_request_frame(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     ReverseContext *s = ctx->priv;
     int ret;

     ret = ff_request_frame(ctx->inputs[0]);

     if (ret == AVERROR_EOF && s->nb_frames > 0) {
         AVFrame *out = s->frames[s->nb_frames - 1];
         out->pts     = s->pts[s->flush_idx++];

         if (av_sample_fmt_is_planar(out->format))
             reverse_samples_planar(out);
         else
             reverse_samples_packed(out);
         ret = ff_filter_frame(outlink, out);
         s->frames[s->nb_frames - 1] = NULL;
         s->nb_frames--;
     }

     return ret;
 }

 static const AVFilterPad areverse_inputs[] = {
     {
         .name           = "default",
         .type           = AVMEDIA_TYPE_AUDIO,
         .filter_frame   = filter_frame,
         .needs_writable = 1,
     },
     { NULL }
 };

 static const AVFilterPad areverse_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_AUDIO,
         .request_frame = areverse_request_frame,
     },
     { NULL }
 };

 AVFilter ff_af_areverse = {
     .name          = "areverse",
     .description   = NULL_IF_CONFIG_SMALL("Reverse an audio clip."),
     .query_formats = query_formats,
     .priv_size     = sizeof(ReverseContext),
     .init          = init,
     .uninit        = uninit,
     .inputs        = areverse_inputs,
     .outputs       = areverse_outputs,
 };

 #endif /* CONFIG_AREVERSE_FILTER */
	/*
	* Copyright (c) 2015 Derek Buitenhuis
	*
	* 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/opt.h"
	#include "avfilter.h"
	#include "formats.h"
	#include "internal.h"
	#include "video.h"

	#define DEFAULT_LENGTH 300

	typedef struct ReverseContext {
	int nb_frames;
	AVFrame **frames;
	unsigned int frames_size;
	unsigned int pts_size;
	int64_t *pts;
	int flush_idx;
	} ReverseContext;

	static av_cold int init(AVFilterContext *ctx)
	{
	ReverseContext *s = ctx->priv;

	s->pts = av_fast_realloc(NULL, &s->pts_size,
	DEFAULT_LENGTH * sizeof(*(s->pts)));
	if (!s->pts)
	return AVERROR(ENOMEM);

	s->frames = av_fast_realloc(NULL, &s->frames_size,
	DEFAULT_LENGTH * sizeof(*(s->frames)));
	if (!s->frames) {
	av_freep(&s->pts);
	return AVERROR(ENOMEM);
	}

	return 0;
	}

	static av_cold void uninit(AVFilterContext *ctx)
	{
	ReverseContext *s = ctx->priv;

	while (s->nb_frames > 0) {
	av_frame_free(&s->frames[s->nb_frames - 1]);
	s->nb_frames--;
	}

	av_freep(&s->pts);
	av_freep(&s->frames);
	}

	static int filter_frame(AVFilterLink inlink, AVFrame in)
	{
	AVFilterContext *ctx = inlink->dst;
	ReverseContext *s = ctx->priv;
	void *ptr;

	if (s->nb_frames + 1 > s->pts_size / sizeof(*(s->pts))) {
	ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
	if (!ptr)
	return AVERROR(ENOMEM);
	s->pts = ptr;
	}

	if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
	ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
	if (!ptr)
	return AVERROR(ENOMEM);
	s->frames = ptr;
	}

	s->frames[s->nb_frames] = in;
	s->pts[s->nb_frames] = in->pts;
	s->nb_frames++;

	return 0;
	}

	#if CONFIG_REVERSE_FILTER

	static int request_frame(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	ReverseContext *s = ctx->priv;
	int ret;

	ret = ff_request_frame(ctx->inputs[0]);

	if (ret == AVERROR_EOF && s->nb_frames > 0) {
	AVFrame *out = s->frames[s->nb_frames - 1];
	out->pts = s->pts[s->flush_idx++];
	ret = ff_filter_frame(outlink, out);
	s->frames[s->nb_frames - 1] = NULL;
	s->nb_frames--;
	}

	return ret;
	}

	static const AVFilterPad reverse_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.filter_frame = filter_frame,
	},
	{ NULL }
	};

	static const AVFilterPad reverse_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_VIDEO,
	.request_frame = request_frame,
	},
	{ NULL }
	};

	AVFilter ff_vf_reverse = {
	.name = "reverse",
	.description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
	.priv_size = sizeof(ReverseContext),
	.init = init,
	.uninit = uninit,
	.inputs = reverse_inputs,
	.outputs = reverse_outputs,
	};

	#endif /* CONFIG_REVERSE_FILTER */

	#if CONFIG_AREVERSE_FILTER

	static int query_formats(AVFilterContext *ctx)
	{
	AVFilterFormats *formats;
	AVFilterChannelLayouts *layouts;
	int ret;

	layouts = ff_all_channel_counts();
	if (!layouts)
	return AVERROR(ENOMEM);
	ret = ff_set_common_channel_layouts(ctx, layouts);
	if (ret < 0)
	return ret;

	ret = ff_set_common_formats(ctx, ff_all_formats(AVMEDIA_TYPE_AUDIO));
	if (ret < 0)
	return ret;

	formats = ff_all_samplerates();
	if (!formats)
	return AVERROR(ENOMEM);
	return ff_set_common_samplerates(ctx, formats);
	}

	static void reverse_samples_planar(AVFrame *out)
	{
	for (int p = 0; p < out->channels; p++) {
	switch (out->format) {
	case AV_SAMPLE_FMT_U8P: {
	uint8_t dst = (uint8_t )out->extended_data[p];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	FFSWAP(uint8_t, dst[i], dst[j]);
	}
	break;
	case AV_SAMPLE_FMT_S16P: {
	int16_t dst = (int16_t )out->extended_data[p];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	FFSWAP(int16_t, dst[i], dst[j]);
	}
	break;
	case AV_SAMPLE_FMT_S32P: {
	int32_t dst = (int32_t )out->extended_data[p];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	FFSWAP(int32_t, dst[i], dst[j]);
	}
	break;
	case AV_SAMPLE_FMT_FLTP: {
	float dst = (float )out->extended_data[p];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	FFSWAP(float, dst[i], dst[j]);
	}
	break;
	case AV_SAMPLE_FMT_DBLP: {
	double dst = (double )out->extended_data[p];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	FFSWAP(double, dst[i], dst[j]);
	}
	break;
	}
	}
	}

	static void reverse_samples_packed(AVFrame *out)
	{
	const int channels = out->channels;

	switch (out->format) {
	case AV_SAMPLE_FMT_U8: {
	uint8_t dst = (uint8_t )out->extended_data[0];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	for (int p = 0; p < channels; p++)
	FFSWAP(uint8_t, dst[i * channels + p], dst[j * channels + p]);
	}
	break;
	case AV_SAMPLE_FMT_S16: {
	int16_t dst = (int16_t )out->extended_data[0];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	for (int p = 0; p < channels; p++)
	FFSWAP(int16_t, dst[i * channels + p], dst[j * channels + p]);
	}
	break;
	case AV_SAMPLE_FMT_S32: {
	int32_t dst = (int32_t )out->extended_data[0];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	for (int p = 0; p < channels; p++)
	FFSWAP(int32_t, dst[i * channels + p], dst[j * channels + p]);
	}
	break;
	case AV_SAMPLE_FMT_FLT: {
	float dst = (float )out->extended_data[0];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	for (int p = 0; p < channels; p++)
	FFSWAP(float, dst[i * channels + p], dst[j * channels + p]);
	}
	break;
	case AV_SAMPLE_FMT_DBL: {
	double dst = (double )out->extended_data[0];
	for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)
	for (int p = 0; p < channels; p++)
	FFSWAP(double, dst[i * channels + p], dst[j * channels + p]);
	}
	break;
	}
	}

	static int areverse_request_frame(AVFilterLink *outlink)
	{
	AVFilterContext *ctx = outlink->src;
	ReverseContext *s = ctx->priv;
	int ret;

	ret = ff_request_frame(ctx->inputs[0]);

	if (ret == AVERROR_EOF && s->nb_frames > 0) {
	AVFrame *out = s->frames[s->nb_frames - 1];
	out->pts = s->pts[s->flush_idx++];

	if (av_sample_fmt_is_planar(out->format))
	reverse_samples_planar(out);
	else
	reverse_samples_packed(out);
	ret = ff_filter_frame(outlink, out);
	s->frames[s->nb_frames - 1] = NULL;
	s->nb_frames--;
	}

	return ret;
	}

	static const AVFilterPad areverse_inputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_AUDIO,
	.filter_frame = filter_frame,
	.needs_writable = 1,
	},
	{ NULL }
	};

	static const AVFilterPad areverse_outputs[] = {
	{
	.name = "default",
	.type = AVMEDIA_TYPE_AUDIO,
	.request_frame = areverse_request_frame,
	},
	{ NULL }
	};

	AVFilter ff_af_areverse = {
	.name = "areverse",
	.description = NULL_IF_CONFIG_SMALL("Reverse an audio clip."),
	.query_formats = query_formats,
	.priv_size = sizeof(ReverseContext),
	.init = init,
	.uninit = uninit,
	.inputs = areverse_inputs,
	.outputs = areverse_outputs,
	};

	#endif /* CONFIG_AREVERSE_FILTER */