| /* |
| * 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/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; |
| } |