/* * 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 "libavutil/avstring.h" #include "avformat.h" #include <stdlib.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(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(ByteIOContext * pb, char* line, int bufsize) { int i; for (i = 0; i < bufsize - 1; i++) { int b = get_byte(pb); if (b == 0) break; if (b == '\n') { line[i] = '\0'; return 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(ByteIOContext * 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, AVFormatParameters *ap) { ByteIOContext *pb = s->pb; RPLContext *rpl = s->priv_data; AVStream *vst = NULL, *ast = NULL; int total_audio_size; int error = 0; uint32_t i; int32_t 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_metadata_set2(&s->metadata, "title" , line, 0); error |= read_line(pb, line, sizeof(line)); // date/copyright av_metadata_set2(&s->metadata, "copyright", line, 0); error |= read_line(pb, line, sizeof(line)); // author and other av_metadata_set2(&s->metadata, "author" , line, 0); // video headers vst = av_new_stream(s, 0); if (!vst) return AVERROR(ENOMEM); vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->codec_tag = read_line_and_int(pb, &error); // video format vst->codec->width = read_line_and_int(pb, &error); // video width vst->codec->height = read_line_and_int(pb, &error); // video height vst->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample error |= read_line(pb, line, sizeof(line)); // video frames per second fps = read_fps(line, &error); av_set_pts_info(vst, 32, fps.den, fps.num); // Figure out the video codec switch (vst->codec->codec_tag) { #if 0 case 122: vst->codec->codec_id = CODEC_ID_ESCAPE122; break; #endif case 124: vst->codec->codec_id = CODEC_ID_ESCAPE124; // The header is wrong here, at least sometimes vst->codec->bits_per_coded_sample = 16; break; #if 0 case 130: vst->codec->codec_id = CODEC_ID_ESCAPE130; break; #endif default: av_log(s, AV_LOG_WARNING, "RPL video format %i not supported yet!\n", vst->codec->codec_tag); vst->codec->codec_id = CODEC_ID_NONE; } // 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 = av_new_stream(s, 0); if (!ast) return AVERROR(ENOMEM); ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; ast->codec->codec_tag = audio_format; ast->codec->sample_rate = read_line_and_int(pb, &error); // audio bitrate ast->codec->channels = read_line_and_int(pb, &error); // number of audio channels ast->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // audio bits per sample // At least one sample uses 0 for ADPCM, which is really 4 bits // per sample. if (ast->codec->bits_per_coded_sample == 0) ast->codec->bits_per_coded_sample = 4; ast->codec->bit_rate = ast->codec->sample_rate * ast->codec->bits_per_coded_sample * ast->codec->channels; ast->codec->codec_id = CODEC_ID_NONE; switch (audio_format) { case 1: if (ast->codec->bits_per_coded_sample == 16) { // 16-bit audio is always signed ast->codec->codec_id = CODEC_ID_PCM_S16LE; break; } // There are some other formats listed as legal per the spec; // samples needed. break; case 101: if (ast->codec->bits_per_coded_sample == 8) { // The samples with this kind of audio that I have // are all unsigned. ast->codec->codec_id = CODEC_ID_PCM_U8; break; } else if (ast->codec->bits_per_coded_sample == 4) { ast->codec->codec_id = CODEC_ID_ADPCM_IMA_EA_SEAD; break; } break; } if (ast->codec->codec_id == CODEC_ID_NONE) { av_log(s, AV_LOG_WARNING, "RPL audio format %i not supported yet!\n", audio_format); } av_set_pts_info(ast, 32, 1, ast->codec->bit_rate); } else { for (i = 0; i < 3; i++) error |= read_line(pb, line, sizeof(line)); } rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124) av_log(s, AV_LOG_WARNING, "Don't know how to split frames for video format %i. " "Video stream will be broken!\n", vst->codec->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 error |= read_line(pb, line, sizeof(line)); // offset to key frame list // Read the index url_fseek(pb, chunk_catalog_offset, SEEK_SET); total_audio_size = 0; for (i = 0; i < number_of_chunks; i++) { int64_t offset, video_size, audio_size; error |= read_line(pb, line, sizeof(line)); if (3 != sscanf(line, "%"PRId64" , %"PRId64" ; %"PRId64, &offset, &video_size, &audio_size)) error = -1; 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; ByteIOContext *pb = s->pb; AVStream* stream; AVIndexEntry* index_entry; uint32_t 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->nb_index_entries) return -1; index_entry = &stream->index_entries[rpl->chunk_number]; if (rpl->frame_in_part == 0) if (url_fseek(pb, index_entry->pos, SEEK_SET) < 0) return AVERROR(EIO); if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO && stream->codec->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, frame_flags; frame_flags = get_le32(pb); frame_size = get_le32(pb); if (url_fseek(pb, -8, SEEK_CUR) < 0) return AVERROR(EIO); ret = av_get_packet(pb, pkt, frame_size); if (ret != frame_size) { av_free_packet(pkt); 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 != index_entry->size) { av_free_packet(pkt); return AVERROR(EIO); } if (stream->codec->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 rpl_demuxer = { "rpl", NULL_IF_CONFIG_SMALL("RPL/ARMovie format"), sizeof(RPLContext), rpl_probe, rpl_read_header, rpl_read_packet, };