From b746ed70efccb457d9ea9419488a621cf1429207 Mon Sep 17 00:00:00 2001 From: Jan Sebechlebsky Date: Mon, 15 Aug 2016 12:38:35 +0200 Subject: avcodec/bsf: Add list BSF API Signed-off-by: Michael Niedermayer --- libavcodec/bsf.c | 278 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 278 insertions(+) (limited to 'libavcodec/bsf.c') diff --git a/libavcodec/bsf.c b/libavcodec/bsf.c index 40fc925f0d..664565f605 100644 --- a/libavcodec/bsf.c +++ b/libavcodec/bsf.c @@ -22,6 +22,8 @@ #include "libavutil/mem.h" #include "libavutil/opt.h" #include "libavutil/avassert.h" +#include "libavutil/avstring.h" +#include "libavutil/bprint.h" #include "avcodec.h" #include "bsf.h" @@ -236,3 +238,279 @@ int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt) return 0; } + +typedef struct BSFListContext { + const AVClass *class; + + AVBSFContext **bsfs; + int nb_bsfs; + + unsigned idx; // index of currently processed BSF + unsigned flushed_idx; // index of BSF being flushed + +} 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; + + if (!lst->nb_bsfs) + return ff_bsf_get_packet_ref(bsf, out); + + while (1) { + if (lst->idx > lst->flushed_idx) { + ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out); + if (ret == AVERROR(EAGAIN)) { + /* no more packets from idx-1, try with previous */ + ret = 0; + lst->idx--; + continue; + } else if (ret == AVERROR_EOF) { + /* filter idx-1 is done, continue with idx...nb_bsfs */ + lst->flushed_idx = lst->idx; + continue; + }else if (ret < 0) { + /* filtering error */ + break; + } + } else { + ret = ff_bsf_get_packet_ref(bsf, out); + if (ret == AVERROR_EOF) { + lst->idx = lst->flushed_idx; + } else if (ret < 0) + break; + } + + if (lst->idx < lst->nb_bsfs) { + AVPacket *pkt; + if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) { + /* ff_bsf_get_packet_ref returned EOF and idx is first + * filter of yet not flushed filter chain */ + pkt = NULL; + } else { + pkt = out; + } + ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt); + if (ret < 0) + break; + lst->idx++; + } else { + /* The end of filter chain, break to return result */ + break; + } + } + + if (ret < 0) + av_packet_unref(out); + + return ret; +} + +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); +} + +static const AVClass bsf_list_class = { + .class_name = "bsf_list", + .item_name = av_default_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, + .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_dict(bsf, options); + 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); + + av_dict_free(&bsf_options); +end: + 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))) + return AVERROR(ENOMEM); + + while (1) { + bsf_str = av_strtok(buf, ",", &saveptr); + if (!bsf_str) + break; + + 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); +} -- cgit v1.2.3