| /* |
| * ARMovie/RPL demuxer |
| * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <inttypes.h> |
| #include <stdlib.h> |
| |
| #include "libavutil/avstring.h" |
| #include "libavutil/dict.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #define RPL_SIGNATURE "ARMovie\x0A" |
| #define RPL_SIGNATURE_SIZE 8 |
| |
| /** 256 is arbitrary, but should be big enough for any reasonable file. */ |
| #define RPL_LINE_LENGTH 256 |
| |
| static int rpl_probe(const AVProbeData *p) |
| { |
| if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE)) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| typedef struct RPLContext { |
| // RPL header data |
| int32_t frames_per_chunk; |
| |
| // Stream position data |
| uint32_t chunk_number; |
| uint32_t chunk_part; |
| uint32_t frame_in_part; |
| } RPLContext; |
| |
| static int read_line(AVIOContext * pb, char* line, int bufsize) |
| { |
| int i; |
| for (i = 0; i < bufsize - 1; i++) { |
| int b = avio_r8(pb); |
| if (b == 0) |
| break; |
| if (b == '\n') { |
| line[i] = '\0'; |
| return avio_feof(pb) ? -1 : 0; |
| } |
| line[i] = b; |
| } |
| line[i] = '\0'; |
| return -1; |
| } |
| |
| static int32_t read_int(const char* line, const char** endptr, int* error) |
| { |
| unsigned long result = 0; |
| for (; *line>='0' && *line<='9'; line++) { |
| if (result > (0x7FFFFFFF - 9) / 10) |
| *error = -1; |
| result = 10 * result + *line - '0'; |
| } |
| *endptr = line; |
| return result; |
| } |
| |
| static int32_t read_line_and_int(AVIOContext * pb, int* error) |
| { |
| char line[RPL_LINE_LENGTH]; |
| const char *endptr; |
| *error |= read_line(pb, line, sizeof(line)); |
| return read_int(line, &endptr, error); |
| } |
| |
| /** Parsing for fps, which can be a fraction. Unfortunately, |
| * the spec for the header leaves out a lot of details, |
| * so this is mostly guessing. |
| */ |
| static AVRational read_fps(const char* line, int* error) |
| { |
| int64_t num, den = 1; |
| AVRational result; |
| num = read_int(line, &line, error); |
| if (*line == '.') |
| line++; |
| for (; *line>='0' && *line<='9'; line++) { |
| // Truncate any numerator too large to fit into an int64_t |
| if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10) |
| break; |
| num = 10 * num + *line - '0'; |
| den *= 10; |
| } |
| if (!num) |
| *error = -1; |
| av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF); |
| return result; |
| } |
| |
| static int rpl_read_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| RPLContext *rpl = s->priv_data; |
| AVStream *vst = NULL, *ast = NULL; |
| int total_audio_size; |
| int error = 0; |
| const char *endptr; |
| char audio_type[RPL_LINE_LENGTH]; |
| |
| uint32_t i; |
| |
| int32_t video_format, audio_format, chunk_catalog_offset, number_of_chunks; |
| AVRational fps; |
| |
| char line[RPL_LINE_LENGTH]; |
| |
| // The header for RPL/ARMovie files is 21 lines of text |
| // containing the various header fields. The fields are always |
| // in the same order, and other text besides the first |
| // number usually isn't important. |
| // (The spec says that there exists some significance |
| // for the text in a few cases; samples needed.) |
| error |= read_line(pb, line, sizeof(line)); // ARMovie |
| error |= read_line(pb, line, sizeof(line)); // movie name |
| av_dict_set(&s->metadata, "title" , line, 0); |
| error |= read_line(pb, line, sizeof(line)); // date/copyright |
| av_dict_set(&s->metadata, "copyright", line, 0); |
| error |= read_line(pb, line, sizeof(line)); // author and other |
| av_dict_set(&s->metadata, "author" , line, 0); |
| |
| // video headers |
| video_format = read_line_and_int(pb, &error); |
| if (video_format) { |
| vst = avformat_new_stream(s, NULL); |
| if (!vst) |
| return AVERROR(ENOMEM); |
| vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| vst->codecpar->codec_tag = video_format; |
| vst->codecpar->width = read_line_and_int(pb, &error); // video width |
| vst->codecpar->height = read_line_and_int(pb, &error); // video height |
| vst->codecpar->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample |
| |
| // Figure out the video codec |
| switch (vst->codecpar->codec_tag) { |
| #if 0 |
| case 122: |
| vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE122; |
| break; |
| #endif |
| case 124: |
| vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE124; |
| // The header is wrong here, at least sometimes |
| vst->codecpar->bits_per_coded_sample = 16; |
| break; |
| case 130: |
| vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE130; |
| break; |
| default: |
| avpriv_report_missing_feature(s, "Video format %s", |
| av_fourcc2str(vst->codecpar->codec_tag)); |
| vst->codecpar->codec_id = AV_CODEC_ID_NONE; |
| } |
| } else { |
| for (i = 0; i < 3; i++) |
| error |= read_line(pb, line, sizeof(line)); |
| } |
| |
| error |= read_line(pb, line, sizeof(line)); // video frames per second |
| fps = read_fps(line, &error); |
| if (vst) |
| avpriv_set_pts_info(vst, 32, fps.den, fps.num); |
| |
| // Audio headers |
| |
| // ARMovie supports multiple audio tracks; I don't have any |
| // samples, though. This code will ignore additional tracks. |
| audio_format = read_line_and_int(pb, &error); // audio format ID |
| if (audio_format) { |
| ast = avformat_new_stream(s, NULL); |
| if (!ast) |
| return AVERROR(ENOMEM); |
| ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| ast->codecpar->codec_tag = audio_format; |
| ast->codecpar->sample_rate = read_line_and_int(pb, &error); // audio bitrate |
| ast->codecpar->channels = read_line_and_int(pb, &error); // number of audio channels |
| error |= read_line(pb, line, sizeof(line)); |
| ast->codecpar->bits_per_coded_sample = read_int(line, &endptr, &error); // audio bits per sample |
| av_strlcpy(audio_type, endptr, RPL_LINE_LENGTH); |
| // At least one sample uses 0 for ADPCM, which is really 4 bits |
| // per sample. |
| if (ast->codecpar->bits_per_coded_sample == 0) |
| ast->codecpar->bits_per_coded_sample = 4; |
| |
| ast->codecpar->bit_rate = ast->codecpar->sample_rate * |
| ast->codecpar->bits_per_coded_sample * |
| ast->codecpar->channels; |
| |
| ast->codecpar->codec_id = AV_CODEC_ID_NONE; |
| switch (audio_format) { |
| case 1: |
| if (ast->codecpar->bits_per_coded_sample == 16) { |
| // 16-bit audio is always signed |
| ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; |
| break; |
| } else if (ast->codecpar->bits_per_coded_sample == 8) { |
| if(av_stristr(audio_type, "unsigned") != NULL) { |
| ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
| break; |
| } else if(av_stristr(audio_type, "linear") != NULL) { |
| ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8; |
| break; |
| } else { |
| ast->codecpar->codec_id = AV_CODEC_ID_PCM_VIDC; |
| break; |
| } |
| } |
| // There are some other formats listed as legal per the spec; |
| // samples needed. |
| break; |
| case 101: |
| if (ast->codecpar->bits_per_coded_sample == 8) { |
| // The samples with this kind of audio that I have |
| // are all unsigned. |
| ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
| break; |
| } else if (ast->codecpar->bits_per_coded_sample == 4) { |
| ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD; |
| break; |
| } |
| break; |
| } |
| if (ast->codecpar->codec_id == AV_CODEC_ID_NONE) |
| avpriv_request_sample(s, "Audio format %"PRId32, |
| audio_format); |
| avpriv_set_pts_info(ast, 32, 1, ast->codecpar->bit_rate); |
| } else { |
| for (i = 0; i < 3; i++) |
| error |= read_line(pb, line, sizeof(line)); |
| } |
| |
| if (s->nb_streams == 0) |
| return AVERROR_INVALIDDATA; |
| |
| rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk |
| if (vst && rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124) |
| av_log(s, AV_LOG_WARNING, |
| "Don't know how to split frames for video format %s. " |
| "Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag)); |
| |
| number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file |
| // The number in the header is actually the index of the last chunk. |
| number_of_chunks++; |
| |
| error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes |
| error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes |
| chunk_catalog_offset = // offset of the "chunk catalog" |
| read_line_and_int(pb, &error); // (file index) |
| error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite |
| error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite |
| if (vst) { |
| error |= read_line(pb, line, sizeof(line)); // offset to key frame list |
| vst->duration = number_of_chunks * rpl->frames_per_chunk; |
| } |
| |
| // Read the index |
| avio_seek(pb, chunk_catalog_offset, SEEK_SET); |
| total_audio_size = 0; |
| for (i = 0; !error && i < number_of_chunks; i++) { |
| int64_t offset, video_size, audio_size; |
| error |= read_line(pb, line, sizeof(line)); |
| if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64, |
| &offset, &video_size, &audio_size)) { |
| error = -1; |
| continue; |
| } |
| if (vst) |
| av_add_index_entry(vst, offset, i * rpl->frames_per_chunk, |
| video_size, rpl->frames_per_chunk, 0); |
| if (ast) |
| av_add_index_entry(ast, offset + video_size, total_audio_size, |
| audio_size, audio_size * 8, 0); |
| total_audio_size += audio_size * 8; |
| } |
| |
| if (error) return AVERROR(EIO); |
| |
| return 0; |
| } |
| |
| static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| RPLContext *rpl = s->priv_data; |
| AVIOContext *pb = s->pb; |
| AVStream* stream; |
| AVIndexEntry* index_entry; |
| int ret; |
| |
| if (rpl->chunk_part == s->nb_streams) { |
| rpl->chunk_number++; |
| rpl->chunk_part = 0; |
| } |
| |
| stream = s->streams[rpl->chunk_part]; |
| |
| if (rpl->chunk_number >= stream->internal->nb_index_entries) |
| return AVERROR_EOF; |
| |
| index_entry = &stream->internal->index_entries[rpl->chunk_number]; |
| |
| if (rpl->frame_in_part == 0) |
| if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0) |
| return AVERROR(EIO); |
| |
| if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && |
| stream->codecpar->codec_tag == 124) { |
| // We have to split Escape 124 frames because there are |
| // multiple frames per chunk in Escape 124 samples. |
| uint32_t frame_size; |
| |
| avio_skip(pb, 4); /* flags */ |
| frame_size = avio_rl32(pb); |
| if (avio_seek(pb, -8, SEEK_CUR) < 0) |
| return AVERROR(EIO); |
| |
| ret = av_get_packet(pb, pkt, frame_size); |
| if (ret < 0) |
| return ret; |
| if (ret != frame_size) { |
| return AVERROR(EIO); |
| } |
| pkt->duration = 1; |
| pkt->pts = index_entry->timestamp + rpl->frame_in_part; |
| pkt->stream_index = rpl->chunk_part; |
| |
| rpl->frame_in_part++; |
| if (rpl->frame_in_part == rpl->frames_per_chunk) { |
| rpl->frame_in_part = 0; |
| rpl->chunk_part++; |
| } |
| } else { |
| ret = av_get_packet(pb, pkt, index_entry->size); |
| if (ret < 0) |
| return ret; |
| if (ret != index_entry->size) { |
| return AVERROR(EIO); |
| } |
| |
| if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { |
| // frames_per_chunk should always be one here; the header |
| // parsing will warn if it isn't. |
| pkt->duration = rpl->frames_per_chunk; |
| } else { |
| // All the audio codecs supported in this container |
| // (at least so far) are constant-bitrate. |
| pkt->duration = ret * 8; |
| } |
| pkt->pts = index_entry->timestamp; |
| pkt->stream_index = rpl->chunk_part; |
| rpl->chunk_part++; |
| } |
| |
| // None of the Escape formats have keyframes, and the ADPCM |
| // format used doesn't have keyframes. |
| if (rpl->chunk_number == 0 && rpl->frame_in_part == 0) |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| return ret; |
| } |
| |
| AVInputFormat ff_rpl_demuxer = { |
| .name = "rpl", |
| .long_name = NULL_IF_CONFIG_SMALL("RPL / ARMovie"), |
| .priv_data_size = sizeof(RPLContext), |
| .read_probe = rpl_probe, |
| .read_header = rpl_read_header, |
| .read_packet = rpl_read_packet, |
| }; |