diff options
Diffstat (limited to 'libavcodec/filter_units_bsf.c')
-rw-r--r-- | libavcodec/filter_units_bsf.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/libavcodec/filter_units_bsf.c b/libavcodec/filter_units_bsf.c new file mode 100644 index 0000000..bc2ca28 --- /dev/null +++ b/libavcodec/filter_units_bsf.c @@ -0,0 +1,257 @@ +/* + * 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 "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 *out) +{ + FilterUnitsContext *ctx = bsf->priv_data; + CodedBitstreamFragment *frag = &ctx->fragment; + AVPacket *in = NULL; + int err, i, j; + + while (1) { + err = ff_bsf_get_packet(bsf, &in); + if (err < 0) + return err; + + if (ctx->mode == NOOP) { + av_packet_move_ref(out, in); + av_packet_free(&in); + return 0; + } + + err = ff_cbs_read_packet(ctx->cbc, frag, in); + if (err < 0) { + av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n"); + goto fail; + } + + for (i = 0; i < frag->nb_units; 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(ctx->cbc, frag, i); + --i; + } + } + + if (frag->nb_units > 0) + break; + + // Don't return packets with nothing in them. + av_packet_free(&in); + ff_cbs_fragment_reset(ctx->cbc, frag); + } + + err = ff_cbs_write_packet(ctx->cbc, out, frag); + if (err < 0) { + av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n"); + goto fail; + } + + err = av_packet_copy_props(out, in); + if (err < 0) + goto fail; + +fail: + ff_cbs_fragment_reset(ctx->cbc, frag); + av_packet_free(&in); + + 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(ctx->cbc, 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->cbc, &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, +}; |