1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdio.h>
20 #include <stdint.h>
21 #include <stdlib.h>
22
23 #include "libavutil/common.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/error.h"
26 #include "libavutil/video_enc_params.h"
27
28 #include "libavformat/avformat.h"
29
30 #include "libavcodec/avcodec.h"
31
decode_read(AVCodecContext * decoder,AVFrame * frame,int flush,int max_frames)32 static int decode_read(AVCodecContext *decoder, AVFrame *frame, int flush, int max_frames)
33 {
34 const int ret_done = flush ? AVERROR_EOF : AVERROR(EAGAIN);
35 int ret = 0;
36
37 while (ret >= 0 &&
38 (max_frames == 0 || decoder->frame_number < max_frames)) {
39 AVFrameSideData *sd;
40
41 ret = avcodec_receive_frame(decoder, frame);
42 if (ret < 0)
43 return (ret == ret_done) ? 0 : ret;
44
45 fprintf(stdout, "frame %d\n", decoder->frame_number - 1);
46
47 sd = av_frame_get_side_data(frame, AV_FRAME_DATA_VIDEO_ENC_PARAMS);
48 if (sd) {
49 AVVideoEncParams *par = (AVVideoEncParams*)sd->data;
50
51 fprintf(stdout, "AVVideoEncParams %d\n", par->type);
52 fprintf(stdout, "qp %d\n", par->qp);
53 for (int i = 0; i < FF_ARRAY_ELEMS(par->delta_qp); i++)
54 for (int j = 0; j < FF_ARRAY_ELEMS(par->delta_qp[i]); j++) {
55 if (par->delta_qp[i][j])
56 fprintf(stdout, "delta_qp[%d][%d] %"PRId32"\n", i, j, par->delta_qp[i][j]);
57 }
58
59 if (par->nb_blocks) {
60 fprintf(stdout, "nb_blocks %d\n", par->nb_blocks);
61 for (int i = 0; i < par->nb_blocks; i++) {
62 AVVideoBlockParams *b = av_video_enc_params_block(par, i);
63
64 fprintf(stdout, "block %d %d:%d %dx%d %"PRId32"\n",
65 i, b->src_x, b->src_y, b->w, b->h, b->delta_qp);
66 }
67 }
68 }
69
70 av_frame_unref(frame);
71
72 if (max_frames && decoder->frame_number == max_frames)
73 return 1;
74 }
75
76 return (max_frames == 0 || decoder->frame_number < max_frames) ? 0 : 1;
77 }
78
decoder_init(AVFormatContext * demuxer,int stream_idx,AVCodecContext ** dec,AVDictionary ** opts)79 static int decoder_init(AVFormatContext *demuxer, int stream_idx,
80 AVCodecContext **dec, AVDictionary **opts)
81 {
82 const AVCodec *codec;
83 int ret;
84
85 if (stream_idx < 0 || stream_idx >= demuxer->nb_streams)
86 return AVERROR(EINVAL);
87
88 codec = avcodec_find_decoder(demuxer->streams[stream_idx]->codecpar->codec_id);
89 if (!codec)
90 return AVERROR_DECODER_NOT_FOUND;
91
92 *dec = avcodec_alloc_context3(codec);
93 if (!*dec)
94 return AVERROR(ENOMEM);
95
96 ret = avcodec_open2(*dec, NULL, opts);
97 if (ret < 0)
98 return ret;
99
100 return 0;
101 }
102
main(int argc,char ** argv)103 int main(int argc, char **argv)
104 {
105 AVFormatContext *demuxer = NULL;
106 AVCodecContext *decoder = NULL;
107 AVDictionary *opts = NULL;
108
109 AVPacket *pkt = NULL;
110 AVFrame *frame = NULL;
111
112 unsigned int stream_idx, max_frames;
113 const char *filename, *thread_type = NULL, *nb_threads = NULL;
114 int ret = 0;
115
116 if (argc <= 3) {
117 fprintf(stderr, "Usage: %s <input file> <stream index> <max frame count> [<thread count> <thread type>]\n", argv[0]);
118 return 0;
119 }
120
121 filename = argv[1];
122 stream_idx = strtol(argv[2], NULL, 0);
123 max_frames = strtol(argv[3], NULL, 0);
124 if (argc > 5) {
125 nb_threads = argv[4];
126 thread_type = argv[5];
127 }
128
129 ret = av_dict_set(&opts, "threads", nb_threads, 0);
130 ret |= av_dict_set(&opts, "thread_type", thread_type, 0);
131 ret |= av_dict_set(&opts, "export_side_data", "venc_params", 0);
132
133 ret = avformat_open_input(&demuxer, filename, NULL, NULL);
134 if (ret < 0) {
135 fprintf(stderr, "Error opening input file: %d\n", ret);
136 return ret;
137 }
138
139 ret = decoder_init(demuxer, stream_idx, &decoder, &opts);
140 if (ret < 0) {
141 fprintf(stderr, "Error initializing decoder\n");
142 goto finish;
143 }
144
145 pkt = av_packet_alloc();
146 frame = av_frame_alloc();
147 if (!pkt || !frame) {
148 ret = AVERROR(ENOMEM);
149 goto finish;
150 }
151
152 while (ret >= 0) {
153 ret = av_read_frame(demuxer, pkt);
154 if (ret < 0)
155 goto flush;
156 if (pkt->stream_index != stream_idx) {
157 av_packet_unref(pkt);
158 continue;
159 }
160
161 ret = avcodec_send_packet(decoder, pkt);
162 if (ret < 0) {
163 fprintf(stderr, "Error decoding: %d\n", ret);
164 goto finish;
165 }
166 av_packet_unref(pkt);
167
168 ret = decode_read(decoder, frame, 0, max_frames);
169 if (ret < 0) {
170 fprintf(stderr, "Error decoding: %d\n", ret);
171 goto finish;
172 } else if (ret > 0) {
173 ret = 0;
174 goto finish;
175 }
176 }
177
178 flush:
179 avcodec_send_packet(decoder, NULL);
180 ret = decode_read(decoder, frame, 1, max_frames);
181 if (ret < 0) {
182 fprintf(stderr, "Error flushing: %d\n", ret);
183 goto finish;
184 }
185 ret = 0;
186
187 finish:
188 av_dict_free(&opts);
189 av_packet_free(&pkt);
190 av_frame_free(&frame);
191 avcodec_free_context(&decoder);
192 avformat_close_input(&demuxer);
193
194 return ret;
195 }
196