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-rw-r--r--libavdevice/lavfi.c514
1 files changed, 514 insertions, 0 deletions
diff --git a/libavdevice/lavfi.c b/libavdevice/lavfi.c
new file mode 100644
index 0000000000..126e5f62ce
--- /dev/null
+++ b/libavdevice/lavfi.c
@@ -0,0 +1,514 @@
+/*
+ * 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/log.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavfilter/avfilter.h"
+#include "libavfilter/avfiltergraph.h"
+#include "libavfilter/buffersink.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->codec->codec_id = AV_CODEC_ID_EIA_608;
+ st->codec->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;
+ 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));
+
+ avfilter_register_all();
+
+ 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;
+ ret = avio_open(&avio, lavfi->graph_filename, AVIO_FLAG_READ);
+ 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->filename);
+
+ /* 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 = inout->filter_ctx->output_pads[inout->pad_idx].type;
+
+ 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);
+ fputs(dump, stderr);
+ fflush(stderr);
+ av_free(dump);
+ }
+
+ /* fill each stream with the information in the corresponding sink */
+ for (i = 0; i < lavfi->nb_sinks; i++) {
+ AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
+ AVStream *st = avctx->streams[i];
+ st->codec->codec_type = link->type;
+ avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
+ if (link->type == AVMEDIA_TYPE_VIDEO) {
+ st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
+ st->codec->pix_fmt = link->format;
+ st->codec->time_base = link->time_base;
+ st->codec->width = link->w;
+ st->codec->height = link->h;
+ st ->sample_aspect_ratio =
+ st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
+ avctx->probesize = FFMAX(avctx->probesize,
+ link->w * link->h *
+ av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) *
+ 30);
+ } else if (link->type == AVMEDIA_TYPE_AUDIO) {
+ st->codec->codec_id = av_get_pcm_codec(link->format, -1);
+ st->codec->channels = avfilter_link_get_channels(link);
+ st->codec->sample_fmt = link->format;
+ st->codec->sample_rate = link->sample_rate;
+ st->codec->time_base = link->time_base;
+ st->codec->channel_layout = link->channel_layout;
+ if (st->codec->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(link->format));
+ }
+ }
+
+ if ((ret = create_subcc_streams(avctx)) < 0)
+ FAIL(ret);
+
+ 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 = av_frame_get_pkt_pos(frame);
+ 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;
+ AVPicture pict;
+ 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 = lavfi->sinks[i]->inputs[0]->time_base;
+ 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) {
+ av_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);
+ av_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;
+
+ av_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 = avpicture_get_size(frame->format, frame->width, frame->height);
+ if ((ret = av_new_packet(pkt, size)) < 0)
+ return ret;
+
+ memcpy(pict.data, frame->data, 4*sizeof(frame->data[0]));
+ memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0]));
+
+ avpicture_layout(&pict, frame->format, frame->width, frame->height,
+ pkt->data, size);
+ } else if (av_frame_get_channels(frame) /* FIXME test audio */) {
+ size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
+ av_frame_get_channels(frame);
+ if ((ret = av_new_packet(pkt, size)) < 0)
+ return ret;
+ memcpy(pkt->data, frame->data[0], size);
+ }
+
+ frame_metadata = av_frame_get_metadata(frame);
+ 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 = av_frame_get_pkt_pos(frame);
+ 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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