/* * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <string.h> #include "libavutil/log.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include "avcodec.h" #include "bsf.h" 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); av_opt_free(ctx); 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 AVClass bsf_class = { .class_name = "AVBSFContext", .item_name = av_default_item_name, .version = LIBAVUTIL_VERSION_INT, .child_next = bsf_child_next, .child_class_next = ff_bsf_child_class_next, }; const AVClass *av_bsf_get_class(void) { return &bsf_class; } int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx) { AVBSFContext *ctx; 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; } ctx->internal = av_mallocz(sizeof(*ctx->internal)); if (!ctx->internal) { ret = AVERROR(ENOMEM); goto fail; } ctx->internal->buffer_pkt = av_packet_alloc(); if (!ctx->internal->buffer_pkt) { ret = AVERROR(ENOMEM); goto fail; } av_opt_set_defaults(ctx); /* 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; } int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt) { if (!pkt || !pkt->data) { ctx->internal->eof = 1; return 0; } if (ctx->internal->eof) { av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n"); return AVERROR(EINVAL); } if (ctx->internal->buffer_pkt->data || ctx->internal->buffer_pkt->side_data_elems) return AVERROR(EAGAIN); av_packet_move_ref(ctx->internal->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 *in = ctx->internal; AVPacket *tmp_pkt; if (in->eof) return AVERROR_EOF; if (!ctx->internal->buffer_pkt->data && !ctx->internal->buffer_pkt->side_data_elems) return AVERROR(EAGAIN); tmp_pkt = av_packet_alloc(); if (!tmp_pkt) return AVERROR(ENOMEM); *pkt = ctx->internal->buffer_pkt; ctx->internal->buffer_pkt = tmp_pkt; return 0; }