diff options
Diffstat (limited to 'libavdevice/lavfi.c')
| -rw-r--r-- | libavdevice/lavfi.c | 447 |
1 files changed, 447 insertions, 0 deletions
diff --git a/libavdevice/lavfi.c b/libavdevice/lavfi.c new file mode 100644 index 0000000..4fc09d8 --- /dev/null +++ b/libavdevice/lavfi.c @@ -0,0 +1,447 @@ +/* + * 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 <fcntl.h> /* O_RDONLY */ + +#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" + +#if HAVE_UNISTD_H +#include <unistd.h> /* close() */ +#endif +#if HAVE_IO_H +#include <io.h> +#endif + +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; + AVFrame *decoded_frame; +} 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->sinks); + avfilter_graph_free(&lavfi->graph); + av_frame_free(&lavfi->decoded_frame); + + 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; + int fd = avpriv_open(lavfi->graph_filename, O_RDONLY); + if (fd == -1) + FAIL(AVERROR(EINVAL)); + av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED); + ret = av_bprint_fd_contents(&graph_file_pb, fd); + av_bprint_chars(&graph_file_pb, '\0', 1); + close(fd); + if (!ret && !av_bprint_is_complete(&graph_file_pb)) + ret = AVERROR(ENOMEM); + if (ret) { + av_bprint_finalize(&graph_file_pb, NULL); + FAIL(ret); + } + if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str))) + FAIL(ret); + } + + 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) + FAIL(ret); + + 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); + + 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)); + + 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; + if (!strcmp(inout->name, "out")) + stream_idx = 0; + else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) { + av_log(avctx, AV_LOG_ERROR, + "Invalid outpad name '%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)); + } + + /* is an audio or video output? */ + type = inout->filter_ctx->output_pads[inout->pad_idx].type; + if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) { + av_log(avctx, AV_LOG_ERROR, + "Output '%s' is not a video or audio output, not yet supported\n", inout->name); + 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; + } + + /* 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(avctx->nb_streams, 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; + } + + lavfi->sinks[i] = sink; + if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0) + FAIL(ret); + } + + /* configure the graph */ + if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0) + FAIL(ret); + + 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 < avctx->nb_streams; 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 (!(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 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; + + /* iterate through all the graph sinks. Select the sink with the + * minimum PTS */ + for (i = 0; i < avctx->nb_streams; 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(frame->pts, tb, AV_TIME_BASE_Q); + 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); + } + + 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, +}; |
