3 * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
23 #include "libavutil/dict.h"
28 #define RPL_SIGNATURE "ARMovie\x0A"
29 #define RPL_SIGNATURE_SIZE 8
31 /** 256 is arbitrary, but should be big enough for any reasonable file. */
32 #define RPL_LINE_LENGTH 256
34 static int rpl_probe(AVProbeData *p)
36 if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
39 return AVPROBE_SCORE_MAX;
42 typedef struct RPLContext {
44 int32_t frames_per_chunk;
46 // Stream position data
47 uint32_t chunk_number;
49 uint32_t frame_in_part;
52 static int read_line(AVIOContext * pb, char* line, int bufsize)
55 for (i = 0; i < bufsize - 1; i++) {
69 static int32_t read_int(const char* line, const char** endptr, int* error)
71 unsigned long result = 0;
72 for (; *line>='0' && *line<='9'; line++) {
73 if (result > (0x7FFFFFFF - 9) / 10)
75 result = 10 * result + *line - '0';
81 static int32_t read_line_and_int(AVIOContext * pb, int* error)
83 char line[RPL_LINE_LENGTH];
85 *error |= read_line(pb, line, sizeof(line));
86 return read_int(line, &endptr, error);
89 /** Parsing for fps, which can be a fraction. Unfortunately,
90 * the spec for the header leaves out a lot of details,
91 * so this is mostly guessing.
93 static AVRational read_fps(const char* line, int* error)
97 num = read_int(line, &line, error);
100 for (; *line>='0' && *line<='9'; line++) {
101 // Truncate any numerator too large to fit into an int64_t
102 if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
104 num = 10 * num + *line - '0';
109 av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
113 static int rpl_read_header(AVFormatContext *s)
115 AVIOContext *pb = s->pb;
116 RPLContext *rpl = s->priv_data;
117 AVStream *vst = NULL, *ast = NULL;
118 int total_audio_size;
123 int32_t audio_format, chunk_catalog_offset, number_of_chunks;
126 char line[RPL_LINE_LENGTH];
128 // The header for RPL/ARMovie files is 21 lines of text
129 // containing the various header fields. The fields are always
130 // in the same order, and other text besides the first
131 // number usually isn't important.
132 // (The spec says that there exists some significance
133 // for the text in a few cases; samples needed.)
134 error |= read_line(pb, line, sizeof(line)); // ARMovie
135 error |= read_line(pb, line, sizeof(line)); // movie name
136 av_dict_set(&s->metadata, "title" , line, 0);
137 error |= read_line(pb, line, sizeof(line)); // date/copyright
138 av_dict_set(&s->metadata, "copyright", line, 0);
139 error |= read_line(pb, line, sizeof(line)); // author and other
140 av_dict_set(&s->metadata, "author" , line, 0);
143 vst = avformat_new_stream(s, NULL);
145 return AVERROR(ENOMEM);
146 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
147 vst->codec->codec_tag = read_line_and_int(pb, &error); // video format
148 vst->codec->width = read_line_and_int(pb, &error); // video width
149 vst->codec->height = read_line_and_int(pb, &error); // video height
150 vst->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample
151 error |= read_line(pb, line, sizeof(line)); // video frames per second
152 fps = read_fps(line, &error);
153 avpriv_set_pts_info(vst, 32, fps.den, fps.num);
155 // Figure out the video codec
156 switch (vst->codec->codec_tag) {
159 vst->codec->codec_id = CODEC_ID_ESCAPE122;
163 vst->codec->codec_id = CODEC_ID_ESCAPE124;
164 // The header is wrong here, at least sometimes
165 vst->codec->bits_per_coded_sample = 16;
169 vst->codec->codec_id = CODEC_ID_ESCAPE130;
173 av_log(s, AV_LOG_WARNING,
174 "RPL video format %i not supported yet!\n",
175 vst->codec->codec_tag);
176 vst->codec->codec_id = CODEC_ID_NONE;
181 // ARMovie supports multiple audio tracks; I don't have any
182 // samples, though. This code will ignore additional tracks.
183 audio_format = read_line_and_int(pb, &error); // audio format ID
185 ast = avformat_new_stream(s, NULL);
187 return AVERROR(ENOMEM);
188 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
189 ast->codec->codec_tag = audio_format;
190 ast->codec->sample_rate = read_line_and_int(pb, &error); // audio bitrate
191 ast->codec->channels = read_line_and_int(pb, &error); // number of audio channels
192 ast->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // audio bits per sample
193 // At least one sample uses 0 for ADPCM, which is really 4 bits
195 if (ast->codec->bits_per_coded_sample == 0)
196 ast->codec->bits_per_coded_sample = 4;
198 ast->codec->bit_rate = ast->codec->sample_rate *
199 ast->codec->bits_per_coded_sample *
200 ast->codec->channels;
202 ast->codec->codec_id = CODEC_ID_NONE;
203 switch (audio_format) {
205 if (ast->codec->bits_per_coded_sample == 16) {
206 // 16-bit audio is always signed
207 ast->codec->codec_id = CODEC_ID_PCM_S16LE;
210 // There are some other formats listed as legal per the spec;
214 if (ast->codec->bits_per_coded_sample == 8) {
215 // The samples with this kind of audio that I have
217 ast->codec->codec_id = CODEC_ID_PCM_U8;
219 } else if (ast->codec->bits_per_coded_sample == 4) {
220 ast->codec->codec_id = CODEC_ID_ADPCM_IMA_EA_SEAD;
225 if (ast->codec->codec_id == CODEC_ID_NONE) {
226 av_log(s, AV_LOG_WARNING,
227 "RPL audio format %i not supported yet!\n",
230 avpriv_set_pts_info(ast, 32, 1, ast->codec->bit_rate);
232 for (i = 0; i < 3; i++)
233 error |= read_line(pb, line, sizeof(line));
236 rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
237 if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124)
238 av_log(s, AV_LOG_WARNING,
239 "Don't know how to split frames for video format %i. "
240 "Video stream will be broken!\n", vst->codec->codec_tag);
242 number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
243 // The number in the header is actually the index of the last chunk.
246 error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes
247 error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes
248 chunk_catalog_offset = // offset of the "chunk catalog"
249 read_line_and_int(pb, &error); // (file index)
250 error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite
251 error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite
252 error |= read_line(pb, line, sizeof(line)); // offset to key frame list
255 avio_seek(pb, chunk_catalog_offset, SEEK_SET);
256 total_audio_size = 0;
257 for (i = 0; i < number_of_chunks; i++) {
258 int64_t offset, video_size, audio_size;
259 error |= read_line(pb, line, sizeof(line));
260 if (3 != sscanf(line, "%"PRId64" , %"PRId64" ; %"PRId64,
261 &offset, &video_size, &audio_size))
263 av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
264 video_size, rpl->frames_per_chunk, 0);
266 av_add_index_entry(ast, offset + video_size, total_audio_size,
267 audio_size, audio_size * 8, 0);
268 total_audio_size += audio_size * 8;
271 if (error) return AVERROR(EIO);
276 static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
278 RPLContext *rpl = s->priv_data;
279 AVIOContext *pb = s->pb;
281 AVIndexEntry* index_entry;
284 if (rpl->chunk_part == s->nb_streams) {
289 stream = s->streams[rpl->chunk_part];
291 if (rpl->chunk_number >= stream->nb_index_entries)
294 index_entry = &stream->index_entries[rpl->chunk_number];
296 if (rpl->frame_in_part == 0)
297 if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0)
300 if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
301 stream->codec->codec_tag == 124) {
302 // We have to split Escape 124 frames because there are
303 // multiple frames per chunk in Escape 124 samples.
306 avio_skip(pb, 4); /* flags */
307 frame_size = avio_rl32(pb);
308 if (avio_seek(pb, -8, SEEK_CUR) < 0)
311 ret = av_get_packet(pb, pkt, frame_size);
312 if (ret != frame_size) {
317 pkt->pts = index_entry->timestamp + rpl->frame_in_part;
318 pkt->stream_index = rpl->chunk_part;
320 rpl->frame_in_part++;
321 if (rpl->frame_in_part == rpl->frames_per_chunk) {
322 rpl->frame_in_part = 0;
326 ret = av_get_packet(pb, pkt, index_entry->size);
327 if (ret != index_entry->size) {
332 if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
333 // frames_per_chunk should always be one here; the header
334 // parsing will warn if it isn't.
335 pkt->duration = rpl->frames_per_chunk;
337 // All the audio codecs supported in this container
338 // (at least so far) are constant-bitrate.
339 pkt->duration = ret * 8;
341 pkt->pts = index_entry->timestamp;
342 pkt->stream_index = rpl->chunk_part;
346 // None of the Escape formats have keyframes, and the ADPCM
347 // format used doesn't have keyframes.
348 if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
349 pkt->flags |= AV_PKT_FLAG_KEY;
354 AVInputFormat ff_rpl_demuxer = {
356 .long_name = NULL_IF_CONFIG_SMALL("RPL/ARMovie format"),
357 .priv_data_size = sizeof(RPLContext),
358 .read_probe = rpl_probe,
359 .read_header = rpl_read_header,
360 .read_packet = rpl_read_packet,