| /* |
| * 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 "bsf.h" |
| #include "bsf_internal.h" |
| #include "codec_desc.h" |
| #include "codec_par.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, |
| #if FF_API_CHILD_CLASS_NEXT |
| .child_class_next = ff_bsf_child_class_next, |
| #endif |
| .child_class_iterate = ff_bsf_child_class_iterate, |
| .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); |
| } |
| |
| static int bsf_list_append_internal(AVBSFList *lst, const char *bsf_name, const char *options, AVDictionary ** options_dict) |
| { |
| 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 && filter->priv_class) { |
| const AVOption *opt = av_opt_next(bsf->priv_data, NULL); |
| const char * shorthand[2] = {NULL}; |
| |
| if (opt) |
| shorthand[0] = opt->name; |
| |
| ret = av_opt_set_from_string(bsf->priv_data, options, shorthand, "=", ":"); |
| if (ret < 0) |
| goto end; |
| } |
| |
| if (options_dict) { |
| ret = av_opt_set_dict2(bsf, options_dict, 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_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options) |
| { |
| return bsf_list_append_internal(lst, bsf_name, NULL, options); |
| } |
| |
| 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(char *str, AVBSFList *bsf_lst) |
| { |
| char *bsf_name, *bsf_options_str; |
| |
| bsf_name = av_strtok(str, "=", &bsf_options_str); |
| if (!bsf_name) |
| return AVERROR(EINVAL); |
| |
| return bsf_list_append_internal(bsf_lst, bsf_name, bsf_options_str, NULL); |
| } |
| |
| 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); |
| } |