/* * 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 <string.h> #include "libavutil/avassert.h" #include "libavutil/log.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "avcodec.h" #include "bsf.h" #define IS_EMPTY(pkt) (!(pkt)->data && !(pkt)->side_data_elems) struct AVBSFInternal { AVPacket *buffer_pkt; int eof; }; void av_bsf_free(AVBSFContext **pctx) { AVBSFContext *ctx; if (!pctx || !*pctx) return; ctx = *pctx; if (ctx->filter->close) ctx->filter->close(ctx); if (ctx->filter->priv_class && ctx->priv_data) av_opt_free(ctx->priv_data); if (ctx->internal) av_packet_free(&ctx->internal->buffer_pkt); av_freep(&ctx->internal); av_freep(&ctx->priv_data); avcodec_parameters_free(&ctx->par_in); avcodec_parameters_free(&ctx->par_out); av_freep(pctx); } static void *bsf_child_next(void *obj, void *prev) { AVBSFContext *ctx = obj; if (!prev && ctx->filter->priv_class) return ctx->priv_data; return NULL; } static const char *bsf_to_name(void *bsf) { return ((AVBSFContext *)bsf)->filter->name; } static const AVClass bsf_class = { .class_name = "AVBSFContext", .item_name = bsf_to_name, .version = LIBAVUTIL_VERSION_INT, .child_next = bsf_child_next, .child_class_next = ff_bsf_child_class_next, .category = AV_CLASS_CATEGORY_BITSTREAM_FILTER, }; const AVClass *av_bsf_get_class(void) { return &bsf_class; } int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx) { AVBSFContext *ctx; AVBSFInternal *bsfi; int ret; ctx = av_mallocz(sizeof(*ctx)); if (!ctx) return AVERROR(ENOMEM); ctx->av_class = &bsf_class; ctx->filter = filter; ctx->par_in = avcodec_parameters_alloc(); ctx->par_out = avcodec_parameters_alloc(); if (!ctx->par_in || !ctx->par_out) { ret = AVERROR(ENOMEM); goto fail; } bsfi = av_mallocz(sizeof(*bsfi)); if (!bsfi) { ret = AVERROR(ENOMEM); goto fail; } ctx->internal = bsfi; bsfi->buffer_pkt = av_packet_alloc(); if (!bsfi->buffer_pkt) { ret = AVERROR(ENOMEM); goto fail; } /* allocate priv data and init private options */ if (filter->priv_data_size) { ctx->priv_data = av_mallocz(filter->priv_data_size); if (!ctx->priv_data) { ret = AVERROR(ENOMEM); goto fail; } if (filter->priv_class) { *(const AVClass **)ctx->priv_data = filter->priv_class; av_opt_set_defaults(ctx->priv_data); } } *pctx = ctx; return 0; fail: av_bsf_free(&ctx); return ret; } int av_bsf_init(AVBSFContext *ctx) { int ret, i; /* check that the codec is supported */ if (ctx->filter->codec_ids) { for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) if (ctx->par_in->codec_id == ctx->filter->codec_ids[i]) break; if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) { const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id); av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the " "bitstream filter '%s'. Supported codecs are: ", desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name); for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) { desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]); av_log(ctx, AV_LOG_ERROR, "%s (%d) ", desc ? desc->name : "unknown", ctx->filter->codec_ids[i]); } av_log(ctx, AV_LOG_ERROR, "\n"); return AVERROR(EINVAL); } } /* initialize output parameters to be the same as input * init below might overwrite that */ ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in); if (ret < 0) return ret; ctx->time_base_out = ctx->time_base_in; if (ctx->filter->init) { ret = ctx->filter->init(ctx); if (ret < 0) return ret; } return 0; } void av_bsf_flush(AVBSFContext *ctx) { AVBSFInternal *bsfi = ctx->internal; bsfi->eof = 0; av_packet_unref(bsfi->buffer_pkt); if (ctx->filter->flush) ctx->filter->flush(ctx); } int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt) { AVBSFInternal *bsfi = ctx->internal; int ret; if (!pkt || IS_EMPTY(pkt)) { bsfi->eof = 1; return 0; } if (bsfi->eof) { av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n"); return AVERROR(EINVAL); } if (!IS_EMPTY(bsfi->buffer_pkt)) return AVERROR(EAGAIN); ret = av_packet_make_refcounted(pkt); if (ret < 0) return ret; av_packet_move_ref(bsfi->buffer_pkt, pkt); return 0; } int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt) { return ctx->filter->filter(ctx, pkt); } int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt) { AVBSFInternal *bsfi = ctx->internal; AVPacket *tmp_pkt; if (bsfi->eof) return AVERROR_EOF; if (IS_EMPTY(bsfi->buffer_pkt)) return AVERROR(EAGAIN); tmp_pkt = av_packet_alloc(); if (!tmp_pkt) return AVERROR(ENOMEM); *pkt = bsfi->buffer_pkt; bsfi->buffer_pkt = tmp_pkt; return 0; } int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt) { AVBSFInternal *bsfi = ctx->internal; if (bsfi->eof) return AVERROR_EOF; if (IS_EMPTY(bsfi->buffer_pkt)) return AVERROR(EAGAIN); av_packet_move_ref(pkt, bsfi->buffer_pkt); return 0; } typedef struct BSFListContext { const AVClass *class; AVBSFContext **bsfs; int nb_bsfs; unsigned idx; // index of currently processed BSF char * item_name; } BSFListContext; static int bsf_list_init(AVBSFContext *bsf) { BSFListContext *lst = bsf->priv_data; int ret, i; const AVCodecParameters *cod_par = bsf->par_in; AVRational tb = bsf->time_base_in; for (i = 0; i < lst->nb_bsfs; ++i) { ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par); if (ret < 0) goto fail; lst->bsfs[i]->time_base_in = tb; ret = av_bsf_init(lst->bsfs[i]); if (ret < 0) goto fail; cod_par = lst->bsfs[i]->par_out; tb = lst->bsfs[i]->time_base_out; } bsf->time_base_out = tb; ret = avcodec_parameters_copy(bsf->par_out, cod_par); fail: return ret; } static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out) { BSFListContext *lst = bsf->priv_data; int ret, eof = 0; if (!lst->nb_bsfs) return ff_bsf_get_packet_ref(bsf, out); while (1) { /* get a packet from the previous filter up the chain */ if (lst->idx) ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out); else ret = ff_bsf_get_packet_ref(bsf, out); if (ret == AVERROR(EAGAIN)) { if (!lst->idx) return ret; lst->idx--; continue; } else if (ret == AVERROR_EOF) { eof = 1; } else if (ret < 0) return ret; /* send it to the next filter down the chain */ if (lst->idx < lst->nb_bsfs) { ret = av_bsf_send_packet(lst->bsfs[lst->idx], eof ? NULL : out); av_assert1(ret != AVERROR(EAGAIN)); if (ret < 0) { av_packet_unref(out); return ret; } lst->idx++; eof = 0; } else if (eof) { return ret; } else { return 0; } } } static void bsf_list_flush(AVBSFContext *bsf) { BSFListContext *lst = bsf->priv_data; for (int i = 0; i < lst->nb_bsfs; i++) av_bsf_flush(lst->bsfs[i]); lst->idx = 0; } static void bsf_list_close(AVBSFContext *bsf) { BSFListContext *lst = bsf->priv_data; int i; for (i = 0; i < lst->nb_bsfs; ++i) av_bsf_free(&lst->bsfs[i]); av_freep(&lst->bsfs); av_freep(&lst->item_name); } static const char *bsf_list_item_name(void *ctx) { static const char *null_filter_name = "null"; AVBSFContext *bsf_ctx = ctx; BSFListContext *lst = bsf_ctx->priv_data; if (!lst->nb_bsfs) return null_filter_name; if (!lst->item_name) { int i; AVBPrint bp; av_bprint_init(&bp, 16, 128); av_bprintf(&bp, "bsf_list("); for (i = 0; i < lst->nb_bsfs; i++) av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name); av_bprintf(&bp, ")"); av_bprint_finalize(&bp, &lst->item_name); } return lst->item_name; } static const AVClass bsf_list_class = { .class_name = "bsf_list", .item_name = bsf_list_item_name, .version = LIBAVUTIL_VERSION_INT, }; const AVBitStreamFilter ff_list_bsf = { .name = "bsf_list", .priv_data_size = sizeof(BSFListContext), .priv_class = &bsf_list_class, .init = bsf_list_init, .filter = bsf_list_filter, .flush = bsf_list_flush, .close = bsf_list_close, }; struct AVBSFList { AVBSFContext **bsfs; int nb_bsfs; }; AVBSFList *av_bsf_list_alloc(void) { return av_mallocz(sizeof(AVBSFList)); } void av_bsf_list_free(AVBSFList **lst) { int i; if (!*lst) return; for (i = 0; i < (*lst)->nb_bsfs; ++i) av_bsf_free(&(*lst)->bsfs[i]); av_free((*lst)->bsfs); av_freep(lst); } int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf) { return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf); } int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options) { int ret; const AVBitStreamFilter *filter; AVBSFContext *bsf; filter = av_bsf_get_by_name(bsf_name); if (!filter) return AVERROR_BSF_NOT_FOUND; ret = av_bsf_alloc(filter, &bsf); if (ret < 0) return ret; if (options) { ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN); if (ret < 0) goto end; } ret = av_bsf_list_append(lst, bsf); end: if (ret < 0) av_bsf_free(&bsf); return ret; } int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf) { int ret = 0; BSFListContext *ctx; if ((*lst)->nb_bsfs == 1) { *bsf = (*lst)->bsfs[0]; av_freep(&(*lst)->bsfs); (*lst)->nb_bsfs = 0; goto end; } ret = av_bsf_alloc(&ff_list_bsf, bsf); if (ret < 0) return ret; ctx = (*bsf)->priv_data; ctx->bsfs = (*lst)->bsfs; ctx->nb_bsfs = (*lst)->nb_bsfs; end: av_freep(lst); return ret; } static int bsf_parse_single(const char *str, AVBSFList *bsf_lst) { char *bsf_name, *bsf_options_str, *buf; AVDictionary *bsf_options = NULL; int ret = 0; if (!(buf = av_strdup(str))) return AVERROR(ENOMEM); bsf_name = av_strtok(buf, "=", &bsf_options_str); if (!bsf_name) { ret = AVERROR(EINVAL); goto end; } if (bsf_options_str) { ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0); if (ret < 0) goto end; } ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options); end: av_dict_free(&bsf_options); av_free(buf); return ret; } int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst) { AVBSFList *lst; char *bsf_str, *buf, *dup, *saveptr; int ret; if (!str) return av_bsf_get_null_filter(bsf_lst); lst = av_bsf_list_alloc(); if (!lst) return AVERROR(ENOMEM); if (!(dup = buf = av_strdup(str))) { ret = AVERROR(ENOMEM); goto end; } while (bsf_str = av_strtok(buf, ",", &saveptr)) { ret = bsf_parse_single(bsf_str, lst); if (ret < 0) goto end; buf = NULL; } ret = av_bsf_list_finalize(&lst, bsf_lst); end: if (ret < 0) av_bsf_list_free(&lst); av_free(dup); return ret; } int av_bsf_get_null_filter(AVBSFContext **bsf) { return av_bsf_alloc(&ff_list_bsf, bsf); }