From ae436cc5e4d75c1a7deefb2b30820486e2f3d8af Mon Sep 17 00:00:00 2001 From: Alexandre Heitor Schmidt Date: Wed, 1 Jan 2020 16:57:02 +0000 Subject: [PATCH] avformat/img2dec: add option to provide metadata fields related to input path libavformat/img2.h: New field export_path_metadata to VideoDemuxData to only allow the use of the extra metadata upon explicit user request, for security reasons. libavformat/img2dec.c: Modify image2 demuxer to make available two special metadata entries called lavf.image2dec.source_path and lavf.image2dec.source_basename, which represents, respectively, the complete path to the source image for the current frame and the basename i.e. the file name related to the current frame. These can then be used by filters like drawtext and others. The metadata fields will only be available when explicitly enabled with image2 option -export_path_metadata 1. doc/demuxers.texi: Documented the new metadata fields available for image2 and how to use them. doc/filters.texi: Added an example on how to use the new metadata fields with drawtext filter, in order to plot the input file path to each output frame. Usage example: ffmpeg -f image2 -export_path_metadata 1 -pattern_type glob -framerate 18 -i '/path/to/input/files/*.jpg' -filter_complex drawtext="fontsize=40:fontcolor=white: fontfile=FreeSans.ttf:borderw=2:bordercolor=black: text='%{metadata\:lavf.image2dec.source_basename\:NA}':x=5:y=50" output.avi Fixes #2874. Signed-off-by: Alexandre Heitor Schmidt Signed-off-by: Marton Balint --- doc/demuxers.texi | 11 +++++++++++ doc/filters.texi | 9 +++++++++ libavformat/img2.h | 1 + libavformat/img2dec.c | 39 +++++++++++++++++++++++++++++++++++++++ libavformat/version.h | 2 +- 5 files changed, 61 insertions(+), 1 deletion(-) diff --git a/doc/demuxers.texi b/doc/demuxers.texi index 0d13bdd1b3..2de14b68d3 100644 --- a/doc/demuxers.texi +++ b/doc/demuxers.texi @@ -456,6 +456,17 @@ nanosecond precision. @item video_size Set the video size of the images to read. If not specified the video size is guessed from the first image file in the sequence. +@item export_path_metadata +If set to 1, will add two extra fields to the metadata found in input, making them +also available for other filters (see @var{drawtext} filter for examples). Default +value is 0. The extra fields are described below: +@table @option +@item lavf.image2dec.source_path +Corresponds to the full path to the input file being read. +@item lavf.image2dec.source_basename +Corresponds to the name of the file being read. +@end table + @end table @subsection Examples diff --git a/doc/filters.texi b/doc/filters.texi index 6fb660b05a..a2f862e85f 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -9932,6 +9932,15 @@ drawtext=fontfile=FreeSans.ttf:text=DOG:fontsize=24:x=10:y=20+24-max_glyph_a, drawtext=fontfile=FreeSans.ttf:text=cow:fontsize=24:x=80:y=20+24-max_glyph_a @end example +@item +Plot special @var{lavf.image2dec.source_basename} metadata onto each frame if +such metadata exists. Otherwise, plot the string "NA". Note that image2 demuxer +must have option @option{-export_path_metadata 1} for the special metadata fields +to be available for filters. +@example +drawtext="fontsize=20:fontcolor=white:fontfile=FreeSans.ttf:text='%@{metadata\:lavf.image2dec.source_basename\:NA@}':x=10:y=10" +@end example + @end itemize For more information about libfreetype, check: diff --git a/libavformat/img2.h b/libavformat/img2.h index 0e5b374a6b..5fd8ff77fc 100644 --- a/libavformat/img2.h +++ b/libavformat/img2.h @@ -61,6 +61,7 @@ typedef struct VideoDemuxData { int start_number_range; int frame_size; int ts_from_file; + int export_path_metadata; /**< enabled when set to 1. */ } VideoDemuxData; typedef struct IdStrMap { diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c index f8b4a655a5..37ee1bb746 100644 --- a/libavformat/img2dec.c +++ b/libavformat/img2dec.c @@ -374,6 +374,33 @@ int ff_img_read_header(AVFormatContext *s1) return 0; } +/** + * Add this frame's source path and basename to packet's sidedata + * as a dictionary, so it can be used by filters like 'drawtext'. + */ +static int add_filename_as_pkt_side_data(char *filename, AVPacket *pkt) { + uint8_t* metadata; + int metadata_len; + AVDictionary *d = NULL; + char *packed_metadata = NULL; + + av_dict_set(&d, "lavf.image2dec.source_path", filename, 0); + av_dict_set(&d, "lavf.image2dec.source_basename", av_basename(filename), 0); + + packed_metadata = av_packet_pack_dictionary(d, &metadata_len); + av_dict_free(&d); + if (!packed_metadata) + return AVERROR(ENOMEM); + if (!(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA, metadata_len))) { + av_freep(&packed_metadata); + return AVERROR(ENOMEM); + } + memcpy(metadata, packed_metadata, metadata_len); + av_freep(&packed_metadata); + + return 0; +} + int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt) { VideoDemuxData *s = s1->priv_data; @@ -486,6 +513,17 @@ int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt) if (s->is_pipe) pkt->pos = avio_tell(f[0]); + /* + * export_path_metadata must be explicitly enabled via + * command line options for path metadata to be exported + * as packet side_data. + */ + if (!s->is_pipe && s->export_path_metadata == 1) { + res = add_filename_as_pkt_side_data(filename, pkt); + if (res < 0) + goto fail; + } + pkt->size = 0; for (i = 0; i < 3; i++) { if (f[i]) { @@ -585,6 +623,7 @@ const AVOption ff_img_options[] = { { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" }, { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" }, { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" }, + { "export_path_metadata", "enable metadata containing input path information", OFFSET(export_path_metadata), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, DEC }, \ COMMON_OPTIONS }; diff --git a/libavformat/version.h b/libavformat/version.h index 213b66b45f..43f3811df1 100644 --- a/libavformat/version.h +++ b/libavformat/version.h @@ -33,7 +33,7 @@ // Also please add any ticket numbers that you believe might be affected here #define LIBAVFORMAT_VERSION_MAJOR 58 #define LIBAVFORMAT_VERSION_MINOR 35 -#define LIBAVFORMAT_VERSION_MICRO 101 +#define LIBAVFORMAT_VERSION_MICRO 102 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \ LIBAVFORMAT_VERSION_MINOR, \