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find only the frames X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: =?UTF-8?q?Erkki=20Sepp=C3=A4l=C3=A4?= , OZOPlayer Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" From: Erkki Seppälä Signed-off-by: Erkki Seppälä Signed-off-by: OZOPlayer --- doc/examples/Makefile | 1 + doc/examples/extract_timed_metadata.c | 233 ++++++++++++++++++++++++++++++++++ 2 files changed, 234 insertions(+) create mode 100644 doc/examples/extract_timed_metadata.c diff --git a/doc/examples/Makefile b/doc/examples/Makefile index af38159..c10033e 100644 --- a/doc/examples/Makefile +++ b/doc/examples/Makefile @@ -16,6 +16,7 @@ EXAMPLES= avio_dir_cmd \ decoding_encoding \ demuxing_decoding \ extract_mvs \ + extract_timed_metadata \ filtering_video \ filtering_audio \ http_multiclient \ diff --git a/doc/examples/extract_timed_metadata.c b/doc/examples/extract_timed_metadata.c new file mode 100644 index 0000000..ef84ed9 --- /dev/null +++ b/doc/examples/extract_timed_metadata.c @@ -0,0 +1,233 @@ +/* + * Copyright (c) 2010 Nicolas George + * Copyright (c) 2011 Stefano Sabatini + * Copyright (c) 2015 Erkki Seppälä + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/** + * @file + * API example for decoding and filtering + * @example filtering_video.c + */ + +#define _XOPEN_SOURCE 600 /* for usleep */ +#include +#include + +#include +#include +#include +#include +#include + +#define MAX_METADATA_STREAMS 10 + +static AVFormatContext *fmt_ctx; +static AVCodecContext *dec_ctx[MAX_METADATA_STREAMS]; +static int metadata_stream_indices[MAX_METADATA_STREAMS + 1] = { -1 }; /* terminated with -1 */ + +static int open_input_file(const char *filename) +{ + int ret; + AVCodec *dec = avcodec_find_decoder(AV_CODEC_ID_META); + int i; + int nb_metadata = 0; + + if ((ret = avformat_open_input(&fmt_ctx, filename, NULL, NULL)) < 0) { + av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n"); + return ret; + } + + if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) { + av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n"); + return ret; + } + + for (i = 0; i < fmt_ctx->nb_streams; i++) { + if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_DATA) { + assert(nb_metadata < MAX_METADATA_STREAMS); + metadata_stream_indices[nb_metadata] = i; + nb_metadata++; + } + } + metadata_stream_indices[nb_metadata] = -1; + + if (nb_metadata == 0) { + av_log(NULL, AV_LOG_ERROR, "Cannot find a video stream in the input file\n"); + return ret; + } + + for (i = 0; i < nb_metadata; i++) { + dec_ctx[i] = avcodec_alloc_context3(dec); + if ((ret = avcodec_open2(dec_ctx[i], dec, NULL)) < 0) { + av_log(NULL, AV_LOG_ERROR, "Cannot open metadata decoder for metadata stream on track %d\n", i); + return ret; + } + } + + return 0; +} + +static void* memndup(void* ptr, int n) +{ + void* buffer = malloc(n); + memcpy(buffer, ptr, n); + return buffer; +} + +static char* local_strndup(char* str, int n) +{ + int len = strlen(str); + if (len > n) { + len = n; + } + char* buffer = malloc(n + 1); + memcpy(buffer, str, n); + buffer[len] = 0; + return buffer; +} + +int main(int argc, char **argv) +{ + int ret; + AVPacket packet; + AVData *metadata = avdata_alloc(); + int got_frame; + int i; + + if (!metadata) { + perror("Could not allocate metadata"); + exit(1); + } + if (argc != 2) { + fprintf(stderr, "Usage: %s file\n", argv[0]); + exit(1); + } + + av_register_all(); + + if ((ret = open_input_file(argv[1])) < 0) + goto end; + + for (i = 0; metadata_stream_indices[i] >= 0; i++) { + char *uri = NULL; + int nb_src_idxs; + int *src_idxs = NULL; + char *tref_tag = NULL; + int size; + int trefsSize; + AVTimedMetadata* metadata = + (AVTimedMetadata*) av_stream_get_side_data(fmt_ctx->streams[metadata_stream_indices[i]], + AV_PKT_DATA_TIMED_METADATA_INFO, + &size); + AVTrackReferences* trefs = + (AVTrackReferences*) av_stream_get_side_data(fmt_ctx->streams[metadata_stream_indices[i]], + AV_PKT_DATA_TRACK_REFERENCES, + &trefsSize); + if (metadata) { + tref_tag = local_strndup(metadata->meta_tag, 4); + uri = local_strndup((char*) (metadata + 1), metadata->meta_length); + int j; + int conf_len = metadata->conf_length; + void* conf = memndup((char*) (metadata + 1) + metadata->meta_length, metadata->conf_length); + char* conf_tag = local_strndup(metadata->conf_tag, 4); + nb_src_idxs = trefs ? trefs->nb_tracks : 0; + src_idxs = (int*) (trefs + 1); + printf("Track #%d describing track%s with tref %s", + metadata_stream_indices[i] + 1, + nb_src_idxs > 1 ? "s" : "", + tref_tag); + for (j = 0; j < nb_src_idxs; j++) + printf(" #%d", src_idxs[j]); + printf(" url: %s \n", uri); + printf(" configuration conf tag %s, %d bytes:", conf_tag, conf_len); + for (j = 0; j < conf_len; ++j) { + unsigned char ch = ((unsigned char*) conf)[j]; + if (isprint(ch)) { + printf(" %c", ch); + } else { + printf(" %2x", ((unsigned char*) conf)[j]); + } + } + printf("\n"); + free(conf); + free(conf_tag); + free(uri); + free(tref_tag); + } else { + printf("No meta data info for track %d?!\n", metadata_stream_indices[i]); + } + } + + /* read all packets */ + while (1) { + if ((ret = av_read_frame(fmt_ctx, &packet)) < 0) + break; + + for (i = 0; metadata_stream_indices[i] >= 0; i++) { + if (packet.stream_index == metadata_stream_indices[i]) { + got_frame = 0; + + ret = dec_ctx[i]->codec->decode(dec_ctx[i], metadata, &got_frame, &packet); + + if (ret < 0) { + av_log(NULL, AV_LOG_ERROR, "Error decoding meta data\n"); + break; + } + + if (got_frame) { + int c; + printf("track #%d at %" PRId64 " %d, ", + packet.stream_index + 1, + metadata->pts, + metadata->data->size); + for (c = 0; c < metadata->data->size; ++c) { + char ch = ((char*) metadata->data->data)[c]; + if (ch == '\\') { + printf("\\\\"); + } else if (isprint(ch)) { + putchar(ch); + } else { + printf("\\0x%2x", (unsigned char) ch); + } + } + putchar('\n'); + } else { + printf("no frame..\n"); + } + } + } + av_packet_unref(&packet); + } +end: + for (i = 0; metadata_stream_indices[i] >= 0; i++) { + avcodec_close(dec_ctx[i]); + } + avformat_close_input(&fmt_ctx); + avdata_free(metadata); + + if (ret < 0 && ret != AVERROR_EOF) { + fprintf(stderr, "Error occurred: %s\n", av_err2str(ret)); + exit(1); + } + + exit(0); +}