393 lines
12 KiB
C
393 lines
12 KiB
C
/*
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* Copyright (c) 2008 Vitor Sessak
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* memory buffer source filter
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*/
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#include "audio.h"
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#include "avfilter.h"
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#include "buffersrc.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#include "libavutil/audioconvert.h"
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#include "libavutil/common.h"
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#include "libavutil/fifo.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/samplefmt.h"
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typedef struct {
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const AVClass *class;
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AVFifoBuffer *fifo;
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AVRational time_base; ///< time_base to set in the output link
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/* video only */
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int h, w;
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enum PixelFormat pix_fmt;
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AVRational pixel_aspect;
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/* audio only */
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int sample_rate;
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enum AVSampleFormat sample_fmt;
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char *sample_fmt_str;
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uint64_t channel_layout;
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char *channel_layout_str;
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int eof;
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} BufferSourceContext;
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#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
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if (c->w != width || c->h != height || c->pix_fmt != format) {\
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av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
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return AVERROR(EINVAL);\
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}
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#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
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if (c->sample_fmt != format || c->sample_rate != srate ||\
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c->channel_layout != ch_layout) {\
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av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
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return AVERROR(EINVAL);\
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}
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int av_buffersrc_write_frame(AVFilterContext *buffer_filter, const AVFrame *frame)
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{
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BufferSourceContext *c = buffer_filter->priv;
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AVFilterBufferRef *buf;
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int ret;
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if (!frame) {
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c->eof = 1;
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return 0;
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} else if (c->eof)
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return AVERROR(EINVAL);
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if (!av_fifo_space(c->fifo) &&
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(ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
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sizeof(buf))) < 0)
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return ret;
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switch (buffer_filter->outputs[0]->type) {
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case AVMEDIA_TYPE_VIDEO:
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CHECK_VIDEO_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height,
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frame->format);
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buf = ff_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
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c->w, c->h);
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if (!buf)
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return AVERROR(ENOMEM);
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av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
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c->pix_fmt, c->w, c->h);
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break;
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case AVMEDIA_TYPE_AUDIO:
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CHECK_AUDIO_PARAM_CHANGE(buffer_filter, c, frame->sample_rate, frame->channel_layout,
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frame->format);
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buf = ff_get_audio_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
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frame->nb_samples);
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if (!buf)
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return AVERROR(ENOMEM);
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av_samples_copy(buf->extended_data, frame->extended_data,
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0, 0, frame->nb_samples,
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av_get_channel_layout_nb_channels(frame->channel_layout),
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frame->format);
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break;
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default:
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return AVERROR(EINVAL);
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}
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avfilter_copy_frame_props(buf, frame);
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if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
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avfilter_unref_buffer(buf);
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return ret;
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}
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return 0;
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}
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int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
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{
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BufferSourceContext *c = s->priv;
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int ret;
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if (!buf) {
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c->eof = 1;
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return 0;
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} else if (c->eof)
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return AVERROR(EINVAL);
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if (!av_fifo_space(c->fifo) &&
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(ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
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sizeof(buf))) < 0)
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return ret;
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switch (s->outputs[0]->type) {
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case AVMEDIA_TYPE_VIDEO:
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CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
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break;
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case AVMEDIA_TYPE_AUDIO:
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CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
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buf->format);
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break;
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default:
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return AVERROR(EINVAL);
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}
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if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0)
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return ret;
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return 0;
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}
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static av_cold int init_video(AVFilterContext *ctx, const char *args)
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{
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BufferSourceContext *c = ctx->priv;
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char pix_fmt_str[128];
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int n = 0;
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if (!args ||
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(n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
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&c->time_base.num, &c->time_base.den,
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&c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
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av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
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return AVERROR(EINVAL);
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}
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if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
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char *tail;
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c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
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if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
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av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
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return AVERROR(EINVAL);
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}
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}
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if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
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return AVERROR(ENOMEM);
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av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
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return 0;
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}
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#define OFFSET(x) offsetof(BufferSourceContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM
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static const AVOption audio_options[] = {
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{ "time_base", NULL, OFFSET(time_base), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
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{ "sample_rate", NULL, OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A },
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{ "sample_fmt", NULL, OFFSET(sample_fmt_str), AV_OPT_TYPE_STRING, .flags = A },
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{ "channel_layout", NULL, OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A },
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{ NULL },
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};
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static const AVClass abuffer_class = {
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.class_name = "abuffer source",
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.item_name = av_default_item_name,
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.option = audio_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static av_cold int init_audio(AVFilterContext *ctx, const char *args)
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{
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BufferSourceContext *s = ctx->priv;
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int ret = 0;
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s->class = &abuffer_class;
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av_opt_set_defaults(s);
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if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing options string: %s.\n", args);
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goto fail;
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}
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s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
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if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
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av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
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s->sample_fmt_str);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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s->channel_layout = av_get_channel_layout(s->channel_layout_str);
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if (!s->channel_layout) {
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av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
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s->channel_layout_str);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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if (!s->time_base.num)
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s->time_base = (AVRational){1, s->sample_rate};
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av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
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"ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
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s->sample_rate, s->channel_layout_str);
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fail:
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av_opt_free(s);
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return ret;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BufferSourceContext *s = ctx->priv;
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while (s->fifo && av_fifo_size(s->fifo)) {
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AVFilterBufferRef *buf;
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av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
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avfilter_unref_buffer(buf);
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}
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av_fifo_free(s->fifo);
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s->fifo = NULL;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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BufferSourceContext *c = ctx->priv;
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AVFilterChannelLayouts *channel_layouts = NULL;
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AVFilterFormats *formats = NULL;
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AVFilterFormats *samplerates = NULL;
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switch (ctx->outputs[0]->type) {
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case AVMEDIA_TYPE_VIDEO:
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ff_add_format(&formats, c->pix_fmt);
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ff_set_common_formats(ctx, formats);
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break;
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case AVMEDIA_TYPE_AUDIO:
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ff_add_format(&formats, c->sample_fmt);
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ff_set_common_formats(ctx, formats);
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ff_add_format(&samplerates, c->sample_rate);
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ff_set_common_samplerates(ctx, samplerates);
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ff_add_channel_layout(&channel_layouts, c->channel_layout);
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ff_set_common_channel_layouts(ctx, channel_layouts);
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break;
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default:
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int config_props(AVFilterLink *link)
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{
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BufferSourceContext *c = link->src->priv;
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switch (link->type) {
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case AVMEDIA_TYPE_VIDEO:
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link->w = c->w;
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link->h = c->h;
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link->sample_aspect_ratio = c->pixel_aspect;
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break;
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case AVMEDIA_TYPE_AUDIO:
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link->channel_layout = c->channel_layout;
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link->sample_rate = c->sample_rate;
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break;
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default:
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return AVERROR(EINVAL);
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}
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link->time_base = c->time_base;
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return 0;
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}
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static int request_frame(AVFilterLink *link)
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{
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BufferSourceContext *c = link->src->priv;
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AVFilterBufferRef *buf;
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int ret = 0;
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if (!av_fifo_size(c->fifo)) {
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if (c->eof)
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return AVERROR_EOF;
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return AVERROR(EAGAIN);
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}
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av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
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switch (link->type) {
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case AVMEDIA_TYPE_VIDEO:
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if ((ret = ff_start_frame(link, buf)) < 0 ||
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(ret = ff_draw_slice(link, 0, link->h, 1)) < 0 ||
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(ret = ff_end_frame(link)) < 0)
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return ret;
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break;
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case AVMEDIA_TYPE_AUDIO:
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ret = ff_filter_samples(link, buf);
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break;
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default:
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avfilter_unref_bufferp(&buf);
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return AVERROR(EINVAL);
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}
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return ret;
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}
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static int poll_frame(AVFilterLink *link)
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{
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BufferSourceContext *c = link->src->priv;
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int size = av_fifo_size(c->fifo);
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if (!size && c->eof)
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return AVERROR_EOF;
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return size/sizeof(AVFilterBufferRef*);
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}
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AVFilter avfilter_vsrc_buffer = {
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.name = "buffer",
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.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
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.priv_size = sizeof(BufferSourceContext),
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.query_formats = query_formats,
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.init = init_video,
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.uninit = uninit,
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.inputs = NULL,
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.outputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame,
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.poll_frame = poll_frame,
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.config_props = config_props, },
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{ .name = NULL}},
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};
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AVFilter avfilter_asrc_abuffer = {
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.name = "abuffer",
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.description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
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.priv_size = sizeof(BufferSourceContext),
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.query_formats = query_formats,
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.init = init_audio,
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.uninit = uninit,
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.inputs = NULL,
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.outputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.request_frame = request_frame,
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.poll_frame = poll_frame,
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.config_props = config_props, },
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{ .name = NULL}},
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};
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