1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "media/base/audio_video_metadata_extractor.h"
8 #include "base/strings/string_number_conversions.h"
9 #include "base/strings/string_util.h"
10 #include "base/time/time.h"
11 #include "media/ffmpeg/ffmpeg_common.h"
12 #include "media/filters/blocking_url_protocol.h"
13 #include "media/filters/ffmpeg_glue.h"
19 void OnError(bool* succeeded) {
23 // Returns true if the |tag| matches |expected_key|.
24 bool ExtractString(AVDictionaryEntry* tag, const char* expected_key,
25 std::string* destination) {
26 if (!LowerCaseEqualsASCII(std::string(tag->key), expected_key))
29 if (destination->empty())
30 *destination = tag->value;
35 // Returns true if the |tag| matches |expected_key|.
36 bool ExtractInt(AVDictionaryEntry* tag, const char* expected_key,
38 if (!LowerCaseEqualsASCII(std::string(tag->key), expected_key))
42 if (*destination < 0 && base::StringToInt(tag->value, &temporary) &&
44 *destination = temporary;
52 AudioVideoMetadataExtractor::AudioVideoMetadataExtractor()
62 AudioVideoMetadataExtractor::~AudioVideoMetadataExtractor() {
65 bool AudioVideoMetadataExtractor::Extract(DataSource* source) {
69 media::BlockingUrlProtocol protocol(source, base::Bind(&OnError, &read_ok));
70 media::FFmpegGlue glue(&protocol);
71 AVFormatContext* format_context = glue.format_context();
73 if (!glue.OpenContext())
79 if (!format_context->iformat)
82 if (avformat_find_stream_info(format_context, NULL) < 0)
85 if (format_context->duration != AV_NOPTS_VALUE)
86 duration_ = static_cast<double>(format_context->duration) / AV_TIME_BASE;
88 ExtractDictionary(format_context->metadata);
90 for (unsigned int i = 0; i < format_context->nb_streams; ++i) {
91 AVStream* stream = format_context->streams[i];
95 // Ignore attached pictures for metadata extraction.
96 if ((stream->disposition & AV_DISPOSITION_ATTACHED_PIC) != 0)
99 // Extract dictionary from streams also. Needed for containers that attach
100 // metadata to contained streams instead the container itself, like OGG.
101 ExtractDictionary(stream->metadata);
106 // Extract dimensions of largest stream that's not an attached picture.
107 if (stream->codec->width > 0 && stream->codec->width > width_ &&
108 stream->codec->height > 0 && stream->codec->height > height_) {
109 width_ = stream->codec->width;
110 height_ = stream->codec->height;
118 double AudioVideoMetadataExtractor::duration() const {
123 int AudioVideoMetadataExtractor::width() const {
128 int AudioVideoMetadataExtractor::height() const {
133 int AudioVideoMetadataExtractor::rotation() const {
138 const std::string& AudioVideoMetadataExtractor::album() const {
143 const std::string& AudioVideoMetadataExtractor::artist() const {
148 const std::string& AudioVideoMetadataExtractor::comment() const {
153 const std::string& AudioVideoMetadataExtractor::copyright() const {
158 const std::string& AudioVideoMetadataExtractor::date() const {
163 int AudioVideoMetadataExtractor::disc() const {
168 const std::string& AudioVideoMetadataExtractor::encoder() const {
173 const std::string& AudioVideoMetadataExtractor::encoded_by() const {
178 const std::string& AudioVideoMetadataExtractor::genre() const {
183 const std::string& AudioVideoMetadataExtractor::language() const {
188 const std::string& AudioVideoMetadataExtractor::title() const {
193 int AudioVideoMetadataExtractor::track() const {
198 void AudioVideoMetadataExtractor::ExtractDictionary(AVDictionary* metadata) {
202 AVDictionaryEntry* tag = NULL;
203 while ((tag = av_dict_get(metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
204 if (ExtractInt(tag, "rotate", &rotation_)) continue;
205 if (ExtractString(tag, "album", &album_)) continue;
206 if (ExtractString(tag, "artist", &artist_)) continue;
207 if (ExtractString(tag, "comment", &comment_)) continue;
208 if (ExtractString(tag, "copyright", ©right_)) continue;
209 if (ExtractString(tag, "date", &date_)) continue;
210 if (ExtractInt(tag, "disc", &disc_)) continue;
211 if (ExtractString(tag, "encoder", &encoder_)) continue;
212 if (ExtractString(tag, "encoded_by", &encoded_by_)) continue;
213 if (ExtractString(tag, "genre", &genre_)) continue;
214 if (ExtractString(tag, "language", &language_)) continue;
215 if (ExtractString(tag, "title", &title_)) continue;
216 if (ExtractInt(tag, "track", &track_)) continue;