/* * 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 <float.h> #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" typedef struct BufferSourceContext {    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;     AVBufferRef *hw_frames_ctx;     /* audio only */    int sample_rate;    enum AVSampleFormat sample_fmt;    int channels;    uint64_t channel_layout;    char    *channel_layout_str;     int got_format_from_params;    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);\    } AVBufferSrcParameters *av_buffersrc_parameters_alloc(void){    AVBufferSrcParameters *par = av_mallocz(sizeof(*par));    if (!par)        return NULL;     par->format = -1;     return par;} int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *param){    BufferSourceContext *s = ctx->priv;     if (param->time_base.num > 0 && param->time_base.den > 0)        s->time_base = param->time_base;     switch (ctx->filter->outputs[0].type) {    case AVMEDIA_TYPE_VIDEO:        if (param->format != AV_PIX_FMT_NONE) {            s->got_format_from_params = 1;            s->pix_fmt = param->format;        }        if (param->width > 0)            s->w = param->width;        if (param->height > 0)            s->h = param->height;        if (param->sample_aspect_ratio.num > 0 && param->sample_aspect_ratio.den > 0)            s->pixel_aspect = param->sample_aspect_ratio;        if (param->frame_rate.num > 0 && param->frame_rate.den > 0)            s->frame_rate = param->frame_rate;        if (param->hw_frames_ctx) {            av_buffer_unref(&s->hw_frames_ctx);            s->hw_frames_ctx = av_buffer_ref(param->hw_frames_ctx);            if (!s->hw_frames_ctx)                return AVERROR(ENOMEM);        }        break;    case AVMEDIA_TYPE_AUDIO:        if (param->format != AV_SAMPLE_FMT_NONE) {            s->got_format_from_params = 1;            s->sample_fmt = param->format;        }        if (param->sample_rate > 0)            s->sample_rate = param->sample_rate;        if (param->channel_layout)            s->channel_layout = param->channel_layout;        break;    default:        return AVERROR_BUG;    }     return 0;} 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(ctx, 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(&copy);    return ret;} static int push_frame(AVFilterGraph *graph){    int ret;     while (1) {        ret = ff_filter_graph_run_once(graph);        if (ret == AVERROR(EAGAIN))            break;        if (ret < 0)            return ret;    }    return 0;} static int av_buffersrc_add_frame_internal(AVFilterContext *ctx,                                           AVFrame *frame, int flags){    BufferSourceContext *s = ctx->priv;    AVFrame *copy;    int refcounted, ret;     s->nb_failed_requests = 0;     if (!frame) {        s->eof = 1;        ff_avfilter_link_set_in_status(ctx->outputs[0], AVERROR_EOF, AV_NOPTS_VALUE);        if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {            ret = push_frame(ctx->graph);            if (ret < 0)                return ret;        }        return 0;    } else if (s->eof)        return AVERROR(EINVAL);     refcounted = !!frame->buf[0];     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);     if (refcounted) {        av_frame_move_ref(copy, frame);    } else {        ret = av_frame_ref(copy, frame);        if (ret < 0) {            av_frame_free(&copy);            return ret;        }    }     if ((ret = av_fifo_generic_write(s->fifo, &copy, sizeof(copy), NULL)) < 0) {        if (refcounted)            av_frame_move_ref(frame, copy);        av_frame_free(&copy);        return ret;    }     if ((ret = ctx->output_pads[0].request_frame(ctx->outputs[0])) < 0)        return ret;     if ((flags & AV_BUFFERSRC_FLAG_PUSH)) {        ret = push_frame(ctx->graph);        if (ret < 0)            return ret;    }     return 0;} static av_cold int init_video(AVFilterContext *ctx){    BufferSourceContext *c = ctx->priv;     if (!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params) || !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, { .i64 = AV_PIX_FMT_NONE }, .min = AV_PIX_FMT_NONE, .max = INT_MAX, .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 = 0 }, 0, DBL_MAX, V },    { "pixel_aspect",  "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 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),          AV_OPT_TYPE_SAMPLE_FMT, { .i64 = AV_SAMPLE_FMT_NONE }, .min = AV_SAMPLE_FMT_NONE, .max = INT_MAX, .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;     if (!(s->sample_fmt != AV_SAMPLE_FMT_NONE || s->got_format_from_params)) {        av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");        return AVERROR(EINVAL);    }     if (s->channel_layout_str || s->channel_layout) {        int n;         if (!s->channel_layout) {            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, av_get_sample_fmt_name(s->sample_fmt),           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_buffer_unref(&s->hw_frames_ctx);    av_fifo_freep(&s->fifo);} static int query_formats(AVFilterContext *ctx){    BufferSourceContext *c = ctx->priv;    AVFilterChannelLayouts *channel_layouts = NULL;    AVFilterFormats *formats = NULL;    AVFilterFormats *samplerates = NULL;    int ret;     switch (ctx->outputs[0]->type) {    case AVMEDIA_TYPE_VIDEO:        if ((ret = ff_add_format         (&formats, c->pix_fmt)) < 0 ||            (ret = ff_set_common_formats (ctx     , formats   )) < 0)            return ret;        break;    case AVMEDIA_TYPE_AUDIO:        if ((ret = ff_add_format             (&formats    , c->sample_fmt )) < 0 ||            (ret = ff_set_common_formats     (ctx         , formats       )) < 0 ||            (ret = ff_add_format             (&samplerates, c->sample_rate)) < 0 ||            (ret = ff_set_common_samplerates (ctx         , samplerates   )) < 0)            return ret;         if ((ret = ff_add_channel_layout(&channel_layouts,                              c->channel_layout ? c->channel_layout :                              FF_COUNT2LAYOUT(c->channels))) < 0)            return ret;        if ((ret = ff_set_common_channel_layouts(ctx, channel_layouts)) < 0)            return ret;        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;         if (c->hw_frames_ctx) {            link->hw_frames_ctx = av_buffer_ref(c->hw_frames_ctx);            if (!link->hw_frames_ctx)                return AVERROR(ENOMEM);        }        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;    int ret;     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);     ret = ff_filter_frame(link, frame);     return ret;} 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 }};

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