| /* |
| * 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 |
| */ |
| |
| #include <stdlib.h> |
| |
| #include "libavutil/common.h" |
| #include "libavutil/opt.h" |
| |
| #include "bsf.h" |
| #include "bsf_internal.h" |
| #include "cbs.h" |
| |
| |
| typedef struct FilterUnitsContext { |
| const AVClass *class; |
| |
| CodedBitstreamContext *cbc; |
| CodedBitstreamFragment fragment; |
| |
| const char *pass_types; |
| const char *remove_types; |
| |
| enum { |
| NOOP, |
| PASS, |
| REMOVE, |
| } mode; |
| CodedBitstreamUnitType *type_list; |
| int nb_types; |
| } FilterUnitsContext; |
| |
| |
| static int filter_units_make_type_list(const char *list_string, |
| CodedBitstreamUnitType **type_list, |
| int *nb_types) |
| { |
| CodedBitstreamUnitType *list = NULL; |
| int pass, count; |
| |
| for (pass = 1; pass <= 2; pass++) { |
| long value, range_start, range_end; |
| const char *str; |
| char *value_end; |
| |
| count = 0; |
| for (str = list_string; *str;) { |
| value = strtol(str, &value_end, 0); |
| if (str == value_end) |
| goto invalid; |
| str = (const char *)value_end; |
| if (*str == '-') { |
| ++str; |
| range_start = value; |
| range_end = strtol(str, &value_end, 0); |
| if (str == value_end) |
| goto invalid; |
| |
| for (value = range_start; value < range_end; value++) { |
| if (pass == 2) |
| list[count] = value; |
| ++count; |
| } |
| } else { |
| if (pass == 2) |
| list[count] = value; |
| ++count; |
| } |
| if (*str == '|') |
| ++str; |
| } |
| if (pass == 1) { |
| list = av_malloc_array(count, sizeof(*list)); |
| if (!list) |
| return AVERROR(ENOMEM); |
| } |
| } |
| |
| *type_list = list; |
| *nb_types = count; |
| return 0; |
| |
| invalid: |
| av_freep(&list); |
| return AVERROR(EINVAL); |
| } |
| |
| static int filter_units_filter(AVBSFContext *bsf, AVPacket *pkt) |
| { |
| FilterUnitsContext *ctx = bsf->priv_data; |
| CodedBitstreamFragment *frag = &ctx->fragment; |
| int err, i, j; |
| |
| err = ff_bsf_get_packet_ref(bsf, pkt); |
| if (err < 0) |
| return err; |
| |
| if (ctx->mode == NOOP) |
| return 0; |
| |
| err = ff_cbs_read_packet(ctx->cbc, frag, pkt); |
| if (err < 0) { |
| av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n"); |
| goto fail; |
| } |
| |
| for (i = frag->nb_units - 1; i >= 0; i--) { |
| for (j = 0; j < ctx->nb_types; j++) { |
| if (frag->units[i].type == ctx->type_list[j]) |
| break; |
| } |
| if (ctx->mode == REMOVE ? j < ctx->nb_types |
| : j >= ctx->nb_types) |
| ff_cbs_delete_unit(frag, i); |
| } |
| |
| if (frag->nb_units == 0) { |
| // Don't return packets with nothing in them. |
| err = AVERROR(EAGAIN); |
| goto fail; |
| } |
| |
| err = ff_cbs_write_packet(ctx->cbc, pkt, frag); |
| if (err < 0) { |
| av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n"); |
| goto fail; |
| } |
| |
| fail: |
| if (err < 0) |
| av_packet_unref(pkt); |
| ff_cbs_fragment_reset(frag); |
| |
| return err; |
| } |
| |
| static int filter_units_init(AVBSFContext *bsf) |
| { |
| FilterUnitsContext *ctx = bsf->priv_data; |
| int err; |
| |
| if (ctx->pass_types && ctx->remove_types) { |
| av_log(bsf, AV_LOG_ERROR, "Exactly one of pass_types or " |
| "remove_types is required.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| if (ctx->pass_types) { |
| ctx->mode = PASS; |
| err = filter_units_make_type_list(ctx->pass_types, |
| &ctx->type_list, &ctx->nb_types); |
| if (err < 0) { |
| av_log(bsf, AV_LOG_ERROR, "Failed to parse pass_types.\n"); |
| return err; |
| } |
| } else if (ctx->remove_types) { |
| ctx->mode = REMOVE; |
| err = filter_units_make_type_list(ctx->remove_types, |
| &ctx->type_list, &ctx->nb_types); |
| if (err < 0) { |
| av_log(bsf, AV_LOG_ERROR, "Failed to parse remove_types.\n"); |
| return err; |
| } |
| } else { |
| return 0; |
| } |
| |
| err = ff_cbs_init(&ctx->cbc, bsf->par_in->codec_id, bsf); |
| if (err < 0) |
| return err; |
| |
| // Don't actually decompose anything, we only want the unit data. |
| ctx->cbc->decompose_unit_types = ctx->type_list; |
| ctx->cbc->nb_decompose_unit_types = 0; |
| |
| if (bsf->par_in->extradata) { |
| CodedBitstreamFragment *frag = &ctx->fragment; |
| |
| err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in); |
| if (err < 0) { |
| av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n"); |
| } else { |
| err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag); |
| if (err < 0) |
| av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n"); |
| } |
| |
| ff_cbs_fragment_reset(frag); |
| } |
| |
| return err; |
| } |
| |
| static void filter_units_close(AVBSFContext *bsf) |
| { |
| FilterUnitsContext *ctx = bsf->priv_data; |
| |
| av_freep(&ctx->type_list); |
| |
| ff_cbs_fragment_free(&ctx->fragment); |
| ff_cbs_close(&ctx->cbc); |
| } |
| |
| #define OFFSET(x) offsetof(FilterUnitsContext, x) |
| #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM) |
| static const AVOption filter_units_options[] = { |
| { "pass_types", "List of unit types to pass through the filter.", |
| OFFSET(pass_types), AV_OPT_TYPE_STRING, |
| { .str = NULL }, .flags = FLAGS }, |
| { "remove_types", "List of unit types to remove in the filter.", |
| OFFSET(remove_types), AV_OPT_TYPE_STRING, |
| { .str = NULL }, .flags = FLAGS }, |
| |
| { NULL } |
| }; |
| |
| static const AVClass filter_units_class = { |
| .class_name = "filter_units", |
| .item_name = av_default_item_name, |
| .option = filter_units_options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| const AVBitStreamFilter ff_filter_units_bsf = { |
| .name = "filter_units", |
| .priv_data_size = sizeof(FilterUnitsContext), |
| .priv_class = &filter_units_class, |
| .init = &filter_units_init, |
| .close = &filter_units_close, |
| .filter = &filter_units_filter, |
| .codec_ids = ff_cbs_all_codec_ids, |
| }; |