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🎥 Command line media player
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#include <math.h>
#include <libavformat/avformat.h>
#include "common/av_common.h"#include "common/common.h"#include "common/global.h"#include "common/msg.h"#include "demux/packet.h"#include "demux/stheader.h"
#include "recorder.h"
#define PTS_ADD(a, b) ((a) == MP_NOPTS_VALUE ? (a) : ((a) + (b)))
// Maximum number of packets we buffer at most to attempt to resync streams.// Essentially, this should be higher than the highest supported keyframe// interval.#define QUEUE_MAX_PACKETS 256// Number of packets we should buffer at least to determine timestamps (due to// codec delay and frame reordering, and potentially lack of DTS).// Keyframe flags can trigger this earlier.#define QUEUE_MIN_PACKETS 16
struct mp_recorder { struct mpv_global *global; struct mp_log *log;
struct mp_recorder_sink **streams; int num_streams;
bool opened; // mux context is valid bool muxing; // we're currently recording (instead of preparing) bool muxing_from_start; // no discontinuity at start bool dts_warning;
// The start timestamp of the currently recorded segment (the timestamp of // the first packet of the incoming packet stream). double base_ts; // The output packet timestamp corresponding to base_ts. It's the timestamp // of the first packet of the current segment written to the output. double rebase_ts;
AVFormatContext *mux;};
struct mp_recorder_sink { struct mp_recorder *owner; struct sh_stream *sh; AVStream *av_stream; double max_out_pts; bool discont; bool proper_eof; struct demux_packet **packets; int num_packets;};
static int add_stream(struct mp_recorder *priv, struct sh_stream *sh){ enum AVMediaType av_type = mp_to_av_stream_type(sh->type); if (av_type == AVMEDIA_TYPE_UNKNOWN) return -1;
struct mp_recorder_sink *rst = talloc(priv, struct mp_recorder_sink); *rst = (struct mp_recorder_sink) { .owner = priv, .sh = sh, .av_stream = avformat_new_stream(priv->mux, NULL), .max_out_pts = MP_NOPTS_VALUE, };
if (!rst->av_stream) return -1;
AVCodecParameters *avp = mp_codec_params_to_av(sh->codec); if (!avp) return -1;
#if LIBAVCODEC_VERSION_MICRO >= 100 // We don't know the delay, so make something up. If the format requires // DTS, the result will probably be broken. FFmpeg provides nothing better // yet (unless you demux with libavformat, which contains tons of hacks // that try to determine a PTS). if (!sh->codec->lav_codecpar) avp->video_delay = 16;#endif
if (avp->codec_id == AV_CODEC_ID_NONE) return -1;
if (avcodec_parameters_copy(rst->av_stream->codecpar, avp) < 0) return -1;
rst->av_stream->time_base = mp_get_codec_timebase(sh->codec);
MP_TARRAY_APPEND(priv, priv->streams, priv->num_streams, rst); return 0;}
struct mp_recorder *mp_recorder_create(struct mpv_global *global, const char *target_file, struct sh_stream **streams, int num_streams){ struct mp_recorder *priv = talloc_zero(NULL, struct mp_recorder);
priv->global = global; priv->log = mp_log_new(priv, global->log, "recorder");
if (!num_streams) { MP_ERR(priv, "No streams.\n"); goto error; }
priv->mux = avformat_alloc_context(); if (!priv->mux) goto error;
priv->mux->oformat = av_guess_format(NULL, target_file, NULL); if (!priv->mux->oformat) { MP_ERR(priv, "Output format not found.\n"); goto error; }
if (avio_open2(&priv->mux->pb, target_file, AVIO_FLAG_WRITE, NULL, NULL) < 0) { MP_ERR(priv, "Failed opening output file.\n"); goto error; }
for (int n = 0; n < num_streams; n++) { if (add_stream(priv, streams[n]) < 0) { MP_ERR(priv, "Can't mux one of the input streams.\n"); goto error; } }
// Not sure how to write this in a "standard" way. It appears only mkv // and mp4 support this directly. char version[200]; snprintf(version, sizeof(version), "%s experimental stream recording " "feature (can generate broken files - please report bugs)", mpv_version); av_dict_set(&priv->mux->metadata, "encoding_tool", version, 0);
if (avformat_write_header(priv->mux, NULL) < 0) { MP_ERR(priv, "Writing header failed.\n"); goto error; }
priv->opened = true; priv->muxing_from_start = true;
priv->base_ts = MP_NOPTS_VALUE; priv->rebase_ts = 0;
MP_WARN(priv, "This is an experimental feature. Output files might be " "broken or not play correctly with various players " "(including mpv itself).\n");
return priv;
error: mp_recorder_destroy(priv); return NULL;}
static void flush_packets(struct mp_recorder *priv){ for (int n = 0; n < priv->num_streams; n++) { struct mp_recorder_sink *rst = priv->streams[n]; for (int i = 0; i < rst->num_packets; i++) talloc_free(rst->packets[i]); rst->num_packets = 0; }}
static void mux_packet(struct mp_recorder_sink *rst, struct demux_packet *pkt){ struct mp_recorder *priv = rst->owner; struct demux_packet mpkt = *pkt;
double diff = priv->rebase_ts - priv->base_ts; mpkt.pts = PTS_ADD(mpkt.pts, diff); mpkt.dts = PTS_ADD(mpkt.dts, diff);
rst->max_out_pts = MPMAX(rst->max_out_pts, pkt->pts);
AVPacket avpkt; mp_set_av_packet(&avpkt, &mpkt, &rst->av_stream->time_base);
avpkt.stream_index = rst->av_stream->index;
if (avpkt.duration < 0 && rst->sh->type != STREAM_SUB) avpkt.duration = 0;
AVPacket *new_packet = av_packet_clone(&avpkt); if (!new_packet) { MP_ERR(priv, "Failed to allocate packet.\n"); return; }
if (av_interleaved_write_frame(priv->mux, new_packet) < 0) MP_ERR(priv, "Failed writing packet.\n");}
// Write all packets that currently can be written.static void mux_packets(struct mp_recorder_sink *rst, bool force){ struct mp_recorder *priv = rst->owner; if (!priv->muxing || !rst->num_packets) return;
int safe_count = 0; for (int n = 0; n < rst->num_packets; n++) { if (rst->packets[n]->keyframe) safe_count = n; } if (force) safe_count = rst->num_packets;
for (int n = 0; n < safe_count; n++) { mux_packet(rst, rst->packets[n]); talloc_free(rst->packets[n]); }
// Remove packets[0..safe_count] memmove(&rst->packets[0], &rst->packets[safe_count], (rst->num_packets - safe_count) * sizeof(rst->packets[0])); rst->num_packets -= safe_count;}
// If there was a discontinuity, check whether we can resume muxing (and from// where).static void check_restart(struct mp_recorder *priv){ if (priv->muxing) return;
double min_ts = INFINITY; double rebase_ts = 0; for (int n = 0; n < priv->num_streams; n++) { struct mp_recorder_sink *rst = priv->streams[n]; int min_packets = rst->sh->type == STREAM_VIDEO ? QUEUE_MIN_PACKETS : 1;
rebase_ts = MPMAX(rebase_ts, rst->max_out_pts);
if (rst->num_packets < min_packets) { if (!rst->proper_eof && rst->sh->type != STREAM_SUB) return; continue; }
for (int i = 0; i < min_packets; i++) min_ts = MPMIN(min_ts, rst->packets[i]->pts); }
// Subtitle only stream (wait longer) or stream without any PTS (fuck it). if (!isfinite(min_ts)) return;
priv->rebase_ts = rebase_ts; priv->base_ts = min_ts;
for (int n = 0; n < priv->num_streams; n++) { struct mp_recorder_sink *rst = priv->streams[n]; rst->max_out_pts = min_ts; }
priv->muxing = true;
if (!priv->muxing_from_start) MP_WARN(priv, "Discontinuity at timestamp %f.\n", priv->rebase_ts);}
void mp_recorder_destroy(struct mp_recorder *priv){ if (priv->opened) { for (int n = 0; n < priv->num_streams; n++) { struct mp_recorder_sink *rst = priv->streams[n]; if (!rst->proper_eof) continue; mux_packets(rst, true); }
if (av_write_trailer(priv->mux) < 0) MP_ERR(priv, "Writing trailer failed.\n"); }
if (priv->mux) { if (avio_closep(&priv->mux->pb) < 0) MP_ERR(priv, "Closing file failed\n");
avformat_free_context(priv->mux); }
flush_packets(priv); talloc_free(priv);}
// This is called on a seek, or when recording was started mid-stream.void mp_recorder_mark_discontinuity(struct mp_recorder *priv){ flush_packets(priv);
for (int n = 0; n < priv->num_streams; n++) { struct mp_recorder_sink *rst = priv->streams[n]; rst->discont = true; rst->proper_eof = false; }
priv->muxing = false; priv->muxing_from_start = false;}
// Get a stream for writing. The pointer is valid until mp_recorder is// destroyed. The stream is the index referencing the stream passed to// mp_recorder_create().struct mp_recorder_sink *mp_recorder_get_sink(struct mp_recorder *r, int stream){ assert(stream >= 0 && stream < r->num_streams); return r->streams[stream];}
// Pass a packet to the given stream. The function does not own the packet, but// can create a new reference to it if it needs to retain it. Can be NULL to// signal proper end of stream.void mp_recorder_feed_packet(struct mp_recorder_sink *rst, struct demux_packet *pkt){ struct mp_recorder *priv = rst->owner;
if (!pkt) { rst->proper_eof = true; check_restart(priv); mux_packets(rst, false); return; }
if (pkt->dts == MP_NOPTS_VALUE && !priv->dts_warning) { // No, FFmpeg has no actually usable helpers to generate correct DTS. // No, FFmpeg doesn't tell us which formats need DTS at all. // No, we can not shut up the FFmpeg warning, which will follow. MP_WARN(priv, "Source stream misses DTS on at least some packets!\n" "If the target file format requires DTS, the written\n" "file will be invalid.\n"); priv->dts_warning = true; }
if (rst->discont && !pkt->keyframe) return; rst->discont = false;
if (rst->num_packets >= QUEUE_MAX_PACKETS) { MP_ERR(priv, "Stream %d has too many queued packets; dropping.\n", rst->av_stream->index); return; }
pkt = demux_copy_packet(pkt); if (!pkt) return; MP_TARRAY_APPEND(rst, rst->packets, rst->num_packets, pkt);
check_restart(priv); mux_packets(rst, false);}