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FFmpeg4/libavdevice/lavfi.c

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/*
* Copyright (c) 2011 Stefano Sabatini
*
* 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
* libavfilter virtual input device
*/
/* #define DEBUG */
#include <float.h> /* DBL_MIN, DBL_MAX */
#include "libavutil/bprint.h"
#include "libavutil/channel_layout.h"
#include "libavutil/file.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavfilter/avfilter.h"
#include "libavfilter/buffersink.h"
#include "libavformat/avio_internal.h"
#include "libavformat/internal.h"
#include "avdevice.h"
typedef struct {
AVClass *class; ///< class for private options
char *graph_str;
char *graph_filename;
char *dump_graph;
AVFilterGraph *graph;
AVFilterContext **sinks;
int *sink_stream_map;
int *sink_eof;
int *stream_sink_map;
int *sink_stream_subcc_map;
AVFrame *decoded_frame;
int nb_sinks;
AVPacket subcc_packet;
} LavfiContext;
static int *create_all_formats(int n)
{
int i, j, *fmts, count = 0;
for (i = 0; i < n; i++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
count++;
}
if (!(fmts = av_malloc((count+1) * sizeof(int))))
return NULL;
for (j = 0, i = 0; i < n; i++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
fmts[j++] = i;
}
fmts[j] = -1;
return fmts;
}
av_cold static int lavfi_read_close(AVFormatContext *avctx)
{
LavfiContext *lavfi = avctx->priv_data;
av_freep(&lavfi->sink_stream_map);
av_freep(&lavfi->sink_eof);
av_freep(&lavfi->stream_sink_map);
av_freep(&lavfi->sink_stream_subcc_map);
av_freep(&lavfi->sinks);
avfilter_graph_free(&lavfi->graph);
av_frame_free(&lavfi->decoded_frame);
return 0;
}
static int create_subcc_streams(AVFormatContext *avctx)
{
LavfiContext *lavfi = avctx->priv_data;
AVStream *st;
int stream_idx, sink_idx;
for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
sink_idx = lavfi->stream_sink_map[stream_idx];
if (lavfi->sink_stream_subcc_map[sink_idx]) {
lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
if (!(st = avformat_new_stream(avctx, NULL)))
return AVERROR(ENOMEM);
st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
} else {
lavfi->sink_stream_subcc_map[sink_idx] = -1;
}
}
return 0;
}
av_cold static int lavfi_read_header(AVFormatContext *avctx)
{
LavfiContext *lavfi = avctx->priv_data;
AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
const AVFilter *buffersink, *abuffersink;
int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
enum AVMediaType type;
int ret = 0, i, n;
#define FAIL(ERR) { ret = ERR; goto end; }
if (!pix_fmts)
FAIL(AVERROR(ENOMEM));
buffersink = avfilter_get_by_name("buffersink");
abuffersink = avfilter_get_by_name("abuffersink");
if (lavfi->graph_filename && lavfi->graph_str) {
av_log(avctx, AV_LOG_ERROR,
"Only one of the graph or graph_file options must be specified\n");
FAIL(AVERROR(EINVAL));
}
if (lavfi->graph_filename) {
AVBPrint graph_file_pb;
AVIOContext *avio = NULL;
AVDictionary *options = NULL;
if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
goto end;
ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
av_dict_set(&options, "protocol_whitelist", NULL, 0);
if (ret < 0)
goto end;
av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
avio_closep(&avio);
av_bprint_chars(&graph_file_pb, '\0', 1);
if (!ret && !av_bprint_is_complete(&graph_file_pb))
ret = AVERROR(ENOMEM);
if (ret) {
av_bprint_finalize(&graph_file_pb, NULL);
goto end;
}
if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
goto end;
}
if (!lavfi->graph_str)
lavfi->graph_str = av_strdup(avctx->url);
/* parse the graph, create a stream for each open output */
if (!(lavfi->graph = avfilter_graph_alloc()))
FAIL(AVERROR(ENOMEM));
if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
&input_links, &output_links, avctx)) < 0)
goto end;
if (input_links) {
av_log(avctx, AV_LOG_ERROR,
"Open inputs in the filtergraph are not acceptable\n");
FAIL(AVERROR(EINVAL));
}
/* count the outputs */
for (n = 0, inout = output_links; inout; n++, inout = inout->next);
lavfi->nb_sinks = n;
if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
FAIL(AVERROR(ENOMEM));
if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
FAIL(AVERROR(ENOMEM));
if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
FAIL(AVERROR(ENOMEM));
if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
FAIL(AVERROR(ENOMEM));
for (i = 0; i < n; i++)
lavfi->stream_sink_map[i] = -1;
/* parse the output link names - they need to be of the form out0, out1, ...
* create a mapping between them and the streams */
for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
int stream_idx = 0, suffix = 0, use_subcc = 0;
sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
if (!suffix) {
av_log(avctx, AV_LOG_ERROR,
"Invalid outpad name '%s'\n", inout->name);
FAIL(AVERROR(EINVAL));
}
if (inout->name[suffix]) {
if (!strcmp(inout->name + suffix, "+subcc")) {
use_subcc = 1;
} else {
av_log(avctx, AV_LOG_ERROR,
"Invalid outpad suffix '%s'\n", inout->name);
FAIL(AVERROR(EINVAL));
}
}
if ((unsigned)stream_idx >= n) {
av_log(avctx, AV_LOG_ERROR,
"Invalid index was specified in output '%s', "
"must be a non-negative value < %d\n",
inout->name, n);
FAIL(AVERROR(EINVAL));
}
if (lavfi->stream_sink_map[stream_idx] != -1) {
av_log(avctx, AV_LOG_ERROR,
"An output with stream index %d was already specified\n",
stream_idx);
FAIL(AVERROR(EINVAL));
}
lavfi->sink_stream_map[i] = stream_idx;
lavfi->stream_sink_map[stream_idx] = i;
lavfi->sink_stream_subcc_map[i] = !!use_subcc;
}
/* for each open output create a corresponding stream */
for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
AVStream *st;
if (!(st = avformat_new_stream(avctx, NULL)))
FAIL(AVERROR(ENOMEM));
st->id = i;
}
/* create a sink for each output and connect them to the graph */
lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
if (!lavfi->sinks)
FAIL(AVERROR(ENOMEM));
for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
AVFilterContext *sink;
type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
FAIL(AVERROR_FILTER_NOT_FOUND);
}
if (type == AVMEDIA_TYPE_VIDEO) {
ret = avfilter_graph_create_filter(&sink, buffersink,
inout->name, NULL,
NULL, lavfi->graph);
if (ret >= 0)
ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
if (ret < 0)
goto end;
} else if (type == AVMEDIA_TYPE_AUDIO) {
enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_S32,
AV_SAMPLE_FMT_FLT,
AV_SAMPLE_FMT_DBL, -1 };
ret = avfilter_graph_create_filter(&sink, abuffersink,
inout->name, NULL,
NULL, lavfi->graph);
if (ret >= 0)
ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
if (ret < 0)
goto end;
ret = av_opt_set_int(sink, "all_channel_counts", 1,
AV_OPT_SEARCH_CHILDREN);
if (ret < 0)
goto end;
} else {
av_log(avctx, AV_LOG_ERROR,
"Output '%s' is not a video or audio output, not yet supported\n", inout->name);
FAIL(AVERROR(EINVAL));
}
lavfi->sinks[i] = sink;
if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
goto end;
}
/* configure the graph */
if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
goto end;
if (lavfi->dump_graph) {
char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
if (dump != NULL) {
fputs(dump, stderr);
fflush(stderr);
av_free(dump);
} else {
FAIL(AVERROR(ENOMEM));
}
}
/* fill each stream with the information in the corresponding sink */
for (i = 0; i < lavfi->nb_sinks; i++) {
AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
AVRational time_base = av_buffersink_get_time_base(sink);
AVStream *st = avctx->streams[i];
st->codecpar->codec_type = av_buffersink_get_type(sink);
avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_VIDEO) {
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
st->codecpar->format = av_buffersink_get_format(sink);
st->codecpar->width = av_buffersink_get_w(sink);
st->codecpar->height = av_buffersink_get_h(sink);
st ->sample_aspect_ratio =
st->codecpar->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
avctx->probesize = FFMAX(avctx->probesize,
av_buffersink_get_w(sink) * av_buffersink_get_h(sink) *
av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(av_buffersink_get_format(sink))) *
30);
} else if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_AUDIO) {
st->codecpar->codec_id = av_get_pcm_codec(av_buffersink_get_format(sink), -1);
st->codecpar->channels = av_buffersink_get_channels(sink);
st->codecpar->format = av_buffersink_get_format(sink);
st->codecpar->sample_rate = av_buffersink_get_sample_rate(sink);
st->codecpar->channel_layout = av_buffersink_get_channel_layout(sink);
if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
av_log(avctx, AV_LOG_ERROR,
"Could not find PCM codec for sample format %s.\n",
av_get_sample_fmt_name(av_buffersink_get_format(sink)));
}
}
if ((ret = create_subcc_streams(avctx)) < 0)
goto end;
if (!(lavfi->decoded_frame = av_frame_alloc()))
FAIL(AVERROR(ENOMEM));
end:
av_free(pix_fmts);
avfilter_inout_free(&input_links);
avfilter_inout_free(&output_links);
if (ret < 0)
lavfi_read_close(avctx);
return ret;
}
static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
int sink_idx)
{
LavfiContext *lavfi = avctx->priv_data;
AVFrameSideData *sd;
int stream_idx, i, ret;
if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
return 0;
for (i = 0; i < frame->nb_side_data; i++)
if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
break;
if (i >= frame->nb_side_data)
return 0;
sd = frame->side_data[i];
if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
return ret;
memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
lavfi->subcc_packet.stream_index = stream_idx;
lavfi->subcc_packet.pts = frame->pts;
lavfi->subcc_packet.pos = frame->pkt_pos;
return 0;
}
static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
{
LavfiContext *lavfi = avctx->priv_data;
double min_pts = DBL_MAX;
int stream_idx, min_pts_sink_idx = 0;
AVFrame *frame = lavfi->decoded_frame;
AVDictionary *frame_metadata;
int ret, i;
int size = 0;
if (lavfi->subcc_packet.size) {
*pkt = lavfi->subcc_packet;
av_init_packet(&lavfi->subcc_packet);
lavfi->subcc_packet.size = 0;
lavfi->subcc_packet.data = NULL;
return pkt->size;
}
/* iterate through all the graph sinks. Select the sink with the
* minimum PTS */
for (i = 0; i < lavfi->nb_sinks; i++) {
AVRational tb = av_buffersink_get_time_base(lavfi->sinks[i]);
double d;
int ret;
if (lavfi->sink_eof[i])
continue;
ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
AV_BUFFERSINK_FLAG_PEEK);
if (ret == AVERROR_EOF) {
ff_dlog(avctx, "EOF sink_idx:%d\n", i);
lavfi->sink_eof[i] = 1;
continue;
} else if (ret < 0)
return ret;
d = av_rescale_q_rnd(frame->pts, tb, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
av_frame_unref(frame);
if (d < min_pts) {
min_pts = d;
min_pts_sink_idx = i;
}
}
if (min_pts == DBL_MAX)
return AVERROR_EOF;
ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
if (frame->width /* FIXME best way of testing a video */) {
size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
if ((ret = av_new_packet(pkt, size)) < 0)
return ret;
av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
frame->format, frame->width, frame->height, 1);
} else if (frame->channels /* FIXME test audio */) {
size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
frame->channels;
if ((ret = av_new_packet(pkt, size)) < 0)
return ret;
memcpy(pkt->data, frame->data[0], size);
}
frame_metadata = frame->metadata;
if (frame_metadata) {
uint8_t *metadata;
AVDictionaryEntry *e = NULL;
AVBPrint meta_buf;
av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
av_bprintf(&meta_buf, "%s", e->key);
av_bprint_chars(&meta_buf, '\0', 1);
av_bprintf(&meta_buf, "%s", e->value);
av_bprint_chars(&meta_buf, '\0', 1);
}
if (!av_bprint_is_complete(&meta_buf) ||
!(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
meta_buf.len))) {
av_bprint_finalize(&meta_buf, NULL);
return AVERROR(ENOMEM);
}
memcpy(metadata, meta_buf.str, meta_buf.len);
av_bprint_finalize(&meta_buf, NULL);
}
if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
av_frame_unref(frame);
av_packet_unref(pkt);
return ret;
}
pkt->stream_index = stream_idx;
pkt->pts = frame->pts;
pkt->pos = frame->pkt_pos;
pkt->size = size;
av_frame_unref(frame);
return size;
}
#define OFFSET(x) offsetof(LavfiContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
{ "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ NULL },
};
static const AVClass lavfi_class = {
.class_name = "lavfi indev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_INPUT,
};
AVInputFormat ff_lavfi_demuxer = {
.name = "lavfi",
.long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
.priv_data_size = sizeof(LavfiContext),
.read_header = lavfi_read_header,
.read_packet = lavfi_read_packet,
.read_close = lavfi_read_close,
.flags = AVFMT_NOFILE,
.priv_class = &lavfi_class,
};
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