From 4fd51ee39a6a882dca7305d45e1d98f8065fe2f2 Mon Sep 17 00:00:00 2001 From: Eli Friedman Date: Mon, 31 Mar 2008 10:44:33 +0000 Subject: ARMovie/RPL demuxer Patch by Eli Friedman (eli friedman gmail com) Originally committed as revision 12649 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/rpl.c | 356 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 356 insertions(+) create mode 100644 libavformat/rpl.c (limited to 'libavformat/rpl.c') diff --git a/libavformat/rpl.c b/libavformat/rpl.c new file mode 100644 index 0000000000..a095af90b8 --- /dev/null +++ b/libavformat/rpl.c @@ -0,0 +1,356 @@ +/* + * 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 "avformat.h" +#include "avstring.h" +#include + +#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, s->title , sizeof(s->title )); // movie name + error |= read_line(pb, s->copyright, sizeof(s->copyright)); // date/copyright + error |= read_line(pb, s->author , sizeof(s->author )); // author and other + + // video headers + vst = av_new_stream(s, 0); + if (!vst) + return AVERROR(ENOMEM); + vst->codec->codec_type = CODEC_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_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_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 = CODEC_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_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_sample == 0) + ast->codec->bits_per_sample = 4; + + ast->codec->bit_rate = ast->codec->sample_rate * + ast->codec->bits_per_sample * + ast->codec->channels; + + ast->codec->codec_id = CODEC_ID_NONE; + switch (audio_format) { + case 1: + if (ast->codec->bits_per_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_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_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 == CODEC_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 == CODEC_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 |= PKT_FLAG_KEY; + + return ret; +} + +AVInputFormat rpl_demuxer = { + "rpl", + "RPL/ARMovie format", + sizeof(RPLContext), + rpl_probe, + rpl_read_header, + rpl_read_packet, +}; -- cgit v1.2.3