158 lines
4.0 KiB
C
158 lines
4.0 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/* shared code for simple demux/decode tools */
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#include <stdlib.h>
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#include <string.h>
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#include "decode_simple.h"
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#include "libavformat/avformat.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/packet.h"
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#include "libavutil/dict.h"
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#include "libavutil/error.h"
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#include "libavutil/frame.h"
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static int decode_read(DecodeContext *dc, int flush)
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{
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const int ret_done = flush ? AVERROR_EOF : AVERROR(EAGAIN);
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int ret = 0;
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while (ret >= 0 &&
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(dc->max_frames == 0 || dc->decoder->frame_number < dc->max_frames)) {
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ret = avcodec_receive_frame(dc->decoder, dc->frame);
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if (ret < 0) {
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if (ret == AVERROR_EOF) {
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int err = dc->process_frame(dc, NULL);
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if (err < 0)
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return err;
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}
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return (ret == ret_done) ? 0 : ret;
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}
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ret = dc->process_frame(dc, dc->frame);
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av_frame_unref(dc->frame);
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if (ret < 0)
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return ret;
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if (dc->max_frames && dc->decoder->frame_number == dc->max_frames)
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return 1;
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}
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return (dc->max_frames == 0 || dc->decoder->frame_number < dc->max_frames) ? 0 : 1;
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}
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int ds_run(DecodeContext *dc)
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{
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int ret;
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ret = avcodec_open2(dc->decoder, NULL, &dc->decoder_opts);
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if (ret < 0)
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return ret;
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while (ret >= 0) {
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ret = av_read_frame(dc->demuxer, dc->pkt);
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if (ret < 0)
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goto flush;
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if (dc->pkt->stream_index != dc->stream->index) {
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av_packet_unref(dc->pkt);
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continue;
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}
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ret = avcodec_send_packet(dc->decoder, dc->pkt);
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if (ret < 0) {
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fprintf(stderr, "Error decoding: %d\n", ret);
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return ret;
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}
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av_packet_unref(dc->pkt);
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ret = decode_read(dc, 0);
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if (ret < 0) {
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fprintf(stderr, "Error decoding: %d\n", ret);
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return ret;
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} else if (ret > 0)
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return 0;
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}
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flush:
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avcodec_send_packet(dc->decoder, NULL);
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ret = decode_read(dc, 1);
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if (ret < 0) {
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fprintf(stderr, "Error flushing: %d\n", ret);
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return ret;
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}
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return 0;
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}
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void ds_free(DecodeContext *dc)
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{
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av_dict_free(&dc->decoder_opts);
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av_frame_free(&dc->frame);
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av_packet_free(&dc->pkt);
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avcodec_free_context(&dc->decoder);
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avformat_close_input(&dc->demuxer);
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}
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int ds_open(DecodeContext *dc, const char *url, int stream_idx)
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{
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const AVCodec *codec;
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int ret;
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memset(dc, 0, sizeof(*dc));
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dc->pkt = av_packet_alloc();
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dc->frame = av_frame_alloc();
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if (!dc->pkt || !dc->frame) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ret = avformat_open_input(&dc->demuxer, url, NULL, NULL);
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if (ret < 0) {
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fprintf(stderr, "Error opening input file: %d\n", ret);
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return ret;
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}
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if (stream_idx < 0 || stream_idx >= dc->demuxer->nb_streams)
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return AVERROR(EINVAL);
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dc->stream = dc->demuxer->streams[stream_idx];
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codec = avcodec_find_decoder(dc->stream->codecpar->codec_id);
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if (!codec)
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return AVERROR_DECODER_NOT_FOUND;
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dc->decoder = avcodec_alloc_context3(codec);
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if (!dc->decoder)
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return AVERROR(ENOMEM);
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return 0;
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fail:
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ds_free(dc);
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return ret;
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}
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