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/*

 * Copyright (c) 2008 Vitor Sessak

 *

 * 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

 */

/**

 * @file

 * memory buffer source filter

 */

#include 

#include "libavutil/channel_layout.h"

#include "libavutil/common.h"

#include "libavutil/fifo.h"

#include "libavutil/frame.h"

#include "libavutil/imgutils.h"

#include "libavutil/internal.h"

#include "libavutil/opt.h"

#include "libavutil/samplefmt.h"

#include "audio.h"

#include "avfilter.h"

#include "buffersrc.h"

#include "formats.h"

#include "internal.h"

#include "video.h"

#include "avcodec.h"

typedef struct {

    const AVClass    *class;

    AVFifoBuffer     *fifo;

    AVRational        time_base;     ///< time_base to set in the output link

    AVRational        frame_rate;    ///< frame_rate to set in the output link

    unsigned          nb_failed_requests;

    unsigned          warning_limit;

    /* video only */

    int               w, h;

    enum AVPixelFormat  pix_fmt;

    AVRational        pixel_aspect;

    char              *sws_param;

    /* audio only */

    int sample_rate;

    enum AVSampleFormat sample_fmt;

    char               *sample_fmt_str;

    int channels;

    uint64_t channel_layout;

    char    *channel_layout_str;

    int eof;

} BufferSourceContext;

#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\

    if (c->w != width || c->h != height || c->pix_fmt != format) {\

        av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\

    }

#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)\

    if (c->sample_fmt != format || c->sample_rate != srate ||\

        c->channel_layout != ch_layout || c->channels != ch_count) {\

        av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\

        return AVERROR(EINVAL);\

    }

int attribute_align_arg av_buffersrc_write_frame(AVFilterContext *ctx, const AVFrame *frame)

{

    return av_buffersrc_add_frame_flags(ctx, (AVFrame *)frame,

                                        AV_BUFFERSRC_FLAG_KEEP_REF);

}

int attribute_align_arg av_buffersrc_add_frame(AVFilterContext *ctx, AVFrame *frame)

{

    return av_buffersrc_add_frame_flags(ctx, frame, 0);

}

static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,

                                           AVFrame *frame, int flags);

int attribute_align_arg av_buffersrc_add_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)

{

    AVFrame *copy = NULL;

    int ret = 0;

    if (frame && frame->channel_layout &&

        av_get_channel_layout_nb_channels(frame->channel_layout) != av_frame_get_channels(frame)) {

        av_log(0, AV_LOG_ERROR, "Layout indicates a different number of channels than actually present\n");

        return AVERROR(EINVAL);

    }

    if (!(flags & AV_BUFFERSRC_FLAG_KEEP_REF) || !frame)

        return av_buffersrc_add_frame_internal(ctx, frame, flags);

    if (!(copy = av_frame_alloc()))

        return AVERROR(ENOMEM);

    ret = av_frame_ref(copy, frame);

    if (ret >= 0)

        ret = av_buffersrc_add_frame_internal(ctx, copy, flags);

    av_frame_free(©);

    return ret;

}

static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,

                                           AVFrame *frame, int flags)

{

    BufferSourceContext *s = ctx->priv;

    AVFrame *copy;

    int ret;

    s->nb_failed_requests = 0;

    if (!frame) {

        s->eof = 1;

        return 0;

    } else if (s->eof)

        return AVERROR(EINVAL);

    if (!(flags & AV_BUFFERSRC_FLAG_NO_CHECK_FORMAT)) {

    switch (ctx->outputs[0]->type) {

    case AVMEDIA_TYPE_VIDEO:

        CHECK_VIDEO_PARAM_CHANGE(ctx, s, frame->width, frame->height,

                                 frame->format);

        break;

    case AVMEDIA_TYPE_AUDIO:

        /* For layouts unknown on input but known on link after negotiation. */

        if (!frame->channel_layout)

            frame->channel_layout = s->channel_layout;

        CHECK_AUDIO_PARAM_CHANGE(ctx, s, frame->sample_rate, frame->channel_layout,

                                 av_frame_get_channels(frame), frame->format);

        break;

    default:

        return AVERROR(EINVAL);

    }

    }

    if (!av_fifo_space(s->fifo) &&

        (ret = av_fifo_realloc2(s->fifo, av_fifo_size(s->fifo) +

                                         sizeof(copy))) < 0)

        return ret;

    if (!(copy = av_frame_alloc()))

        return AVERROR(ENOMEM);

    av_frame_move_ref(copy, frame);

    if ((ret = av_fifo_generic_write(s->fifo, ©, sizeof(copy), NULL)) < 0) {

        av_frame_move_ref(frame, copy);

        av_frame_free(©);

        return ret;

    }

    if ((flags & AV_BUFFERSRC_FLAG_PUSH))

        if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)

            return ret;

    return 0;

}

#if FF_API_AVFILTERBUFFER

FF_DISABLE_DEPRECATION_WARNINGS

static void compat_free_buffer(void *opaque, uint8_t *data)

{

    AVFilterBufferRef *buf = opaque;

    AV_NOWARN_DEPRECATED(

    avfilter_unref_buffer(buf);

    )

}

static void compat_unref_buffer(void *opaque, uint8_t *data)

{

    AVBufferRef *buf = opaque;

    AV_NOWARN_DEPRECATED(

    av_buffer_unref(&buf);

    )

}

int av_buffersrc_add_ref(AVFilterContext *ctx, AVFilterBufferRef *buf,

                         int flags)

{

    BufferSourceContext *s = ctx->priv;

    AVFrame *frame = NULL;

    AVBufferRef *dummy_buf = NULL;

    int ret = 0, planes, i;

    if (!buf) {

        s->eof = 1;

        return 0;

    } else if (s->eof)

        return AVERROR(EINVAL);

    frame = av_frame_alloc();

    if (!frame)

        return AVERROR(ENOMEM);

    dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, buf,

                                 (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);

    if (!dummy_buf) {

        ret = AVERROR(ENOMEM);

        goto fail;

    }

    AV_NOWARN_DEPRECATED(

    if ((ret = avfilter_copy_buf_props(frame, buf)) < 0)

        goto fail;

    )

#define WRAP_PLANE(ref_out, data, data_size)                            \

do {                                                                    \

    AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf);                  \

    if (!dummy_ref) {                                                   \

        ret = AVERROR(ENOMEM);                                          \

        goto fail;                                                      \

    }                                                                   \

    ref_out = av_buffer_create(data, data_size, compat_unref_buffer,    \

                               dummy_ref, (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);                           \

    if (!ref_out) {                                                     \

        av_frame_unref(frame);                                          \

        ret = AVERROR(ENOMEM);                                          \

        goto fail;                                                      \

    }                                                                   \

} while (0)

    if (ctx->outputs[0]->type  == AVMEDIA_TYPE_VIDEO) {

        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);

        planes = av_pix_fmt_count_planes(frame->format);

        if (!desc || planes <= 0) {

            ret = AVERROR(EINVAL);

            goto fail;

        }

        for (i = 0; i < planes; i++) {

            int v_shift    = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;

            int plane_size = (frame->height >> v_shift) * frame->linesize[i];

            WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);

        }

    } else {

        int planar = av_sample_fmt_is_planar(frame->format);

        int channels = av_get_channel_layout_nb_channels(frame->channel_layout);

        planes = planar ? channels : 1;

        if (planes > FF_ARRAY_ELEMS(frame->buf)) {

            frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);

            frame->extended_buf = av_mallocz(sizeof(*frame->extended_buf) *

                                             frame->nb_extended_buf);

            if (!frame->extended_buf) {

                ret = AVERROR(ENOMEM);

                goto fail;

            }

        }

        for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)

            WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);

        for (i = 0; i < planes - FF_ARRAY_ELEMS(frame->buf); i++)

            WRAP_PLANE(frame->extended_buf[i],

                       frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],

                       frame->linesize[0]);

    }

    ret = av_buffersrc_add_frame_flags(ctx, frame, flags);

fail:

    av_buffer_unref(&dummy_buf);

    av_frame_free(&frame);

    return ret;

}

FF_ENABLE_DEPRECATION_WARNINGS

int av_buffersrc_buffer(AVFilterContext *ctx, AVFilterBufferRef *buf)

{

    return av_buffersrc_add_ref(ctx, buf, 0);

}

#endif

static av_cold int init_video(AVFilterContext *ctx)

{

    BufferSourceContext *c = ctx->priv;

    if (c->pix_fmt == AV_PIX_FMT_NONE || !c->w || !c->h || av_q2d(c->time_base) <= 0) {

        av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");

        return AVERROR(EINVAL);

    }

    if (!(c->fifo = av_fifo_alloc(sizeof(AVFrame*))))

        return AVERROR(ENOMEM);

    av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s tb:%d/%d fr:%d/%d sar:%d/%d sws_param:%s\n",

           c->w, c->h, av_get_pix_fmt_name(c->pix_fmt),

           c->time_base.num, c->time_base.den, c->frame_rate.num, c->frame_rate.den,

           c->pixel_aspect.num, c->pixel_aspect.den, (char *)av_x_if_null(c->sws_param, ""));

    c->warning_limit = 100;

    return 0;

}

unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src)

{

    return ((BufferSourceContext *)buffer_src->priv)->nb_failed_requests;

}

#define OFFSET(x) offsetof(BufferSourceContext, x)

#define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

#define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

static const AVOption buffer_options[] = {

    { "width",         NULL,                     OFFSET(w),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },

    { "video_size",    NULL,                     OFFSET(w),                AV_OPT_TYPE_IMAGE_SIZE,                .flags = V },

    { "height",        NULL,                     OFFSET(h),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },

    { "pix_fmt",       NULL,                     OFFSET(pix_fmt),          AV_OPT_TYPE_PIXEL_FMT,                 .flags = V },

#if FF_API_OLD_FILTER_OPTS

    /* those 4 are for compatibility with the old option passing system where each filter

     * did its own parsing */

    { "time_base_num", "deprecated, do not use", OFFSET(time_base.num),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },

    { "time_base_den", "deprecated, do not use", OFFSET(time_base.den),    AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },

    { "sar_num",       "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },

    { "sar_den",       "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },

#endif

    { "sar",           "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },

    { "pixel_aspect",  "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },

    { "time_base",     NULL,                     OFFSET(time_base),        AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },

    { "frame_rate",    NULL,                     OFFSET(frame_rate),       AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },

    { "sws_param",     NULL,                     OFFSET(sws_param),        AV_OPT_TYPE_STRING,                    .flags = V },

    { NULL },

};

AVFILTER_DEFINE_CLASS(buffer);

static const AVOption abuffer_options[] = {

    { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },

    { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },

    { "sample_fmt",     NULL, OFFSET(sample_fmt_str),      AV_OPT_TYPE_STRING,             .flags = A },

    { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },

    { "channels",       NULL, OFFSET(channels),            AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },

    { NULL },

};

AVFILTER_DEFINE_CLASS(abuffer);

static av_cold int init_audio(AVFilterContext *ctx)

{

    BufferSourceContext *s = ctx->priv;

    int ret = 0;

    s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);

    if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {

        av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s\n",

               s->sample_fmt_str);

        return AVERROR(EINVAL);

    }

    if (s->channel_layout_str) {

        int n;

        /* TODO reindent */

    s->channel_layout = av_get_channel_layout(s->channel_layout_str);

    if (!s->channel_layout) {

        av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",

               s->channel_layout_str);

        return AVERROR(EINVAL);

    }

        n = av_get_channel_layout_nb_channels(s->channel_layout);

        if (s->channels) {

            if (n != s->channels) {

                av_log(ctx, AV_LOG_ERROR,

                       "Mismatching channel count %d and layout '%s' "

                       "(%d channels)\n",

                       s->channels, s->channel_layout_str, n);

                return AVERROR(EINVAL);

            }

        }

        s->channels = n;

    } else if (!s->channels) {

        av_log(ctx, AV_LOG_ERROR, "Neither number of channels nor "

                                  "channel layout specified\n");

        return AVERROR(EINVAL);

    }

    if (!(s->fifo = av_fifo_alloc(sizeof(AVFrame*))))

        return AVERROR(ENOMEM);

    if (!s->time_base.num)

        s->time_base = (AVRational){1, s->sample_rate};

    av_log(ctx, AV_LOG_VERBOSE,

           "tb:%d/%d samplefmt:%s samplerate:%d chlayout:%s\n",

           s->time_base.num, s->time_base.den, s->sample_fmt_str,

           s->sample_rate, s->channel_layout_str);

    s->warning_limit = 100;

    return ret;

}

static av_cold void uninit(AVFilterContext *ctx)

{

    BufferSourceContext *s = ctx->priv;

    while (s->fifo && av_fifo_size(s->fifo)) {

        AVFrame *frame;

        av_fifo_generic_read(s->fifo, &frame, sizeof(frame), NULL);

        av_frame_free(&frame);

    }

    av_fifo_free(s->fifo);

    s->fifo = NULL;

}

static int query_formats(AVFilterContext *ctx)

{

    BufferSourceContext *c = ctx->priv;

    AVFilterChannelLayouts *channel_layouts = NULL;

    AVFilterFormats *formats = NULL;

    AVFilterFormats *samplerates = NULL;

    switch (ctx->outputs[0]->type) {

    case AVMEDIA_TYPE_VIDEO:

        ff_add_format(&formats, c->pix_fmt);

        ff_set_common_formats(ctx, formats);

        break;

    case AVMEDIA_TYPE_AUDIO:

        ff_add_format(&formats,           c->sample_fmt);

        ff_set_common_formats(ctx, formats);

        ff_add_format(&samplerates,       c->sample_rate);

        ff_set_common_samplerates(ctx, samplerates);

        ff_add_channel_layout(&channel_layouts,

                              c->channel_layout ? c->channel_layout :

                              FF_COUNT2LAYOUT(c->channels));

        ff_set_common_channel_layouts(ctx, channel_layouts);

        break;

    default:

        return AVERROR(EINVAL);

    }

    return 0;

}

static int config_props(AVFilterLink *link)

{

    BufferSourceContext *c = link->src->priv;

    switch (link->type) {

    case AVMEDIA_TYPE_VIDEO:

        link->w = c->w;

        link->h = c->h;

        link->sample_aspect_ratio = c->pixel_aspect;

        break;

    case AVMEDIA_TYPE_AUDIO:

        if (!c->channel_layout)

            c->channel_layout = link->channel_layout;

        break;

    default:

        return AVERROR(EINVAL);

    }

    link->time_base = c->time_base;

    link->frame_rate = c->frame_rate;

    return 0;

}

static int request_frame(AVFilterLink *link)

{

    BufferSourceContext *c = link->src->priv;

    AVFrame *frame;

    if (!av_fifo_size(c->fifo)) {

        if (c->eof)

            return AVERROR_EOF;

        c->nb_failed_requests++;

        return AVERROR(EAGAIN);

    }

    av_fifo_generic_read(c->fifo, &frame, sizeof(frame), NULL);

    return ff_filter_frame(link, frame);

}

static int poll_frame(AVFilterLink *link)

{

    BufferSourceContext *c = link->src->priv;

    int size = av_fifo_size(c->fifo);

    if (!size && c->eof)

        return AVERROR_EOF;

    return size/sizeof(AVFrame*);

}

static const AVFilterPad avfilter_vsrc_buffer_outputs[] = {

    {

        .name          = "default",

        .type          = AVMEDIA_TYPE_VIDEO,

        .request_frame = request_frame,

        .poll_frame    = poll_frame,

        .config_props  = config_props,

    },

    { NULL }

};

AVFilter avfilter_vsrc_buffer = {

    .name      = "buffer",

    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),

    .priv_size = sizeof(BufferSourceContext),

    .query_formats = query_formats,

    .init      = init_video,

    .uninit    = uninit,

    .inputs    = NULL,

    .outputs   = avfilter_vsrc_buffer_outputs,

    .priv_class = &buffer_class,

};

static const AVFilterPad avfilter_asrc_abuffer_outputs[] = {

    {

        .name          = "default",

        .type          = AVMEDIA_TYPE_AUDIO,

        .request_frame = request_frame,

        .poll_frame    = poll_frame,

        .config_props  = config_props,

    },

    { NULL }

};

AVFilter avfilter_asrc_abuffer = {

    .name          = "abuffer",

    .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),

    .priv_size     = sizeof(BufferSourceContext),

    .query_formats = query_formats,

    .init      = init_audio,

    .uninit    = uninit,

    .inputs    = NULL,

    .outputs   = avfilter_asrc_abuffer_outputs,

    .priv_class = &abuffer_class,

};